Air cooled inverter water chillers

Air cooled inverter water chillers
Air cooled inverter water chiller
OPERATION
MANUAL
OPERATION MANUAL
Air cooled inverter water chillers
D-EOMAC00909-16EN
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
1
Air cooled inverter water chiller
OPERATION
MANUAL
Table of Contents
1
SAFETY CONSIDERATIONS .................................................................................................. 6
1.1
General ............................................................................................................................. 6
1.2
Avoid electrocution ........................................................................................................... 6
1.3
Safety Devices .................................................................................................................. 7
1.3.1
General safety devices .............................................................................................. 7
1.3.2
Circuit safety devices ................................................................................................. 7
1.3.3
Component safety devices ......................................................................................... 7
1.4
Available sensors.............................................................................................................. 9
1.4.1
Pressure transducers ................................................................................................. 9
1.4.2
Temperature sensors ................................................................................................. 9
1.4.3
Thermistors................................................................................................................ 9
1.4.4
Leak detectors ........................................................................................................... 9
1.5
Available Controls ............................................................................................................. 9
1.5.1
Evaporator pumps ..................................................................................................... 9
1.5.2
Compressors ............................................................................................................. 9
1.5.3
Expansion Valve ...................................................................................................... 10
1.6
Customer Terminal Block Connections ........................................................................... 10
1.6.1
2
3
General description.................................................................................................. 10
GENERAL DESCRIPTION .................................................................................................... 13
2.1
General ........................................................................................................................... 13
2.2
Abbreviations used ......................................................................................................... 13
2.3
Controller Operating Limits ............................................................................................. 14
2.4
Controller Architecture .................................................................................................... 14
2.5
Communication Modules ................................................................................................ 15
Using the Controller ............................................................................................................... 16
3.1
General Recommendation .............................................................................................. 16
3.2
Navigating....................................................................................................................... 17
3.3
Passwords ...................................................................................................................... 17
3.4
Editing ............................................................................................................................ 18
3.5
Basic Control System Diagnostic .................................................................................... 19
3.6
Controller maintenance ................................................................................................... 21
Operation Manual
2
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
4
OPERATION
MANUAL
3.7
Optional Remote User Interface ...................................................................................... 21
3.8
Embedded Web Interface ............................................................................................... 22
Menu Structure ...................................................................................................................... 24
4.1
Main Menu ...................................................................................................................... 24
4.2
View/Set Unit .................................................................................................................. 24
4.2.1
Thermostat Ctrl ........................................................................................................ 24
4.2.2
Network Ctrl ............................................................................................................. 25
4.2.3
Vfd Settings ............................................................................................................. 25
4.2.4
Pumps ..................................................................................................................... 25
4.2.5
Master/Slave ............................................................................................................ 26
4.2.6
Rapid Restart ........................................................................................................... 28
4.2.7
Date/Time ................................................................................................................ 28
4.2.8
Scheduler ................................................................................................................ 29
4.2.9
Power Conservation ................................................................................................ 29
4.2.10
Electrical Data ......................................................................................................... 29
4.2.11
Controller IP setup ................................................................................................... 30
4.2.12
Daikin on Site .......................................................................................................... 30
4.2.13
Menu Password ....................................................................................................... 30
4.3
View/Set Circuit .............................................................................................................. 30
4.3.1
Data ......................................................................................................................... 31
4.3.2
Compressor ............................................................................................................. 32
4.3.3
Condenser ............................................................................................................... 32
4.3.4
EXV ......................................................................................................................... 33
4.3.5
Economizer.............................................................................................................. 33
4.3.6
Settings ................................................................................................................... 33
4.4
Temperature Setpoint ..................................................................................................... 33
4.5
Temperatures ................................................................................................................. 33
4.6
Unit Capacity .................................................................................................................. 34
4.7
Unit Mode ....................................................................................................................... 34
4.8
Unit Enable ..................................................................................................................... 34
4.9
Timers ............................................................................................................................ 34
4.10
Alarms ............................................................................................................................ 34
4.11
Commission Unit............................................................................................................. 35
4.11.1
Configuration ........................................................................................................... 35
4.11.2
Alarm Limits ............................................................................................................. 36
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
3
Air cooled inverter water chiller
4.11.3
Calibrate Sensors .................................................................................................... 37
4.11.4
Manual Control ........................................................................................................ 37
4.11.5
Scheduled Maintenance .......................................................................................... 39
4.11.6
Setup for communication modules ........................................................................... 39
4.12
5
About this Chiller............................................................................................................. 39
Working with this unit ............................................................................................................. 40
5.1
Unit Setup ....................................................................................................................... 40
5.1.1
Control Source ......................................................................................................... 40
5.1.2
Available Mode Setting ............................................................................................ 40
5.1.3
Temperature Settings .............................................................................................. 41
5.1.4
Alarm Settings ......................................................................................................... 42
5.1.5
Evap Pump Settings ................................................................................................ 43
5.1.6
Power Conservation ................................................................................................ 43
5.1.7
Date/Time ................................................................................................................ 46
5.1.8
Scheduler ................................................................................................................ 47
5.2
6
OPERATION
MANUAL
Unit/Circuit Start-up ........................................................................................................ 47
5.2.1
Prepare the unit to start ........................................................................................... 47
5.2.2
Preparing circuits to start ......................................................................................... 49
5.3
Compressor Capacity Control ......................................................................................... 51
5.4
Condensation Control ..................................................................................................... 53
5.4.1
Fan Settings ............................................................................................................ 54
5.4.2
Fan VFD Settings .................................................................................................... 54
5.5
EXV Control .................................................................................................................... 55
5.6
Economizer Control ........................................................................................................ 56
5.7
Liquid Injection Control ................................................................................................... 57
5.8
Variable Volume Ratio Control ........................................................................................ 57
Alarms ................................................................................................................................... 58
6.1.1
Unit Warning Alarms ................................................................................................ 58
6.1.2
Unit Problems .......................................................................................................... 61
6.1.3
Unit Pumpdown Stop Alarms ................................................................................... 62
6.1.4
Unit Rapid Stop Alarms............................................................................................ 63
6.1.5
Circuit Warning Alarms ............................................................................................ 67
6.1.6
Circuit Pumpdown Stop Alarms ............................................................................... 70
6.1.7
Circuit Rapid Stop Alarms ........................................................................................ 72
Operation Manual
4
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
7
OPERATION
MANUAL
Options .................................................................................................................................. 81
7.1
Total Heat Recovery (Optional) ....................................................................................... 81
7.2
Energy Meter including Current Limit (Optional).............................................................. 81
7.3
Rapid Restart (Optional) ................................................................................................. 82
7.4
Inverter Pump Kit (Optional)............................................................................................ 83
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
5
Air cooled inverter water chiller
OPERATION
MANUAL
1 SAFETY CONSIDERATIONS
1.1 General
Installation, start-up and servicing of equipment can be hazardous if certain factors particular to the
installation are not considered: operating pressures, presence of electrical components and
voltages and the installation site (elevated plinths and built-up up structures). Only properly
qualified installation engineers and highly qualified installers and technicians, fully trained for the
product, are authorized to install and start-up the equipment safely.
During all servicing operations, all instructions and recommendations, which appear in the
installation and service instructions for the product, as well as on tags and labels fixed to the
equipment and components and accompanying parts supplied separately, must be read,
understood and followed.
Apply all standard safety codes and practices.
Wear safety glasses and gloves.
Use the proper tools to move heavy objects. Move units carefully and set them down gently.
1.2 Avoid electrocution
Only personnel qualified in accordance with IEC (International Electrotechnical Commission)
recommendations may be permitted access to electrical components. It is particularly
recommended that all sources of electricity to the unit be shut off before any work is begun. Shut
off main power supply at the main circuit breaker or isolator.
IMPORTANT: This equipment uses and emits electromagnetic signals. Tests have shown
that the equipment conforms to all applicable codes with respect to electromagnetic
compatibility.
RISK OF ELECTROCUTION: Even when the main circuit breaker or isolator is switched
off, certain circuits may still be energised, since they may be connected to a separate
power source.
RISK OF BURNS: Electrical currents cause components to get hot either temporarily or
permanently. Handle power cable, electrical cables and conduits, terminal box covers
and motor frames with great care.
ATTENTION: In accordance with the operating conditions the fans can be cleaned
periodically. A fan can start at any time, even if the unit has been shut down.
Operation Manual
6
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
1.3 Safety Devices
Each unit is equipped with safety devices of three different kinds:
1.3.1 General safety devices
Safeties of this level of severity will shut down all the circuits and stop the entire unit. When a
general safety device will occur a manual intervention on the unit will be required in order to reestablish the normal operability of the machine. There are exceptions to this general rule in case of
alarms linked to temporary abnormal conditions.

Emergency Stop
A push button is placed on a door of the unit electrical panel. The button is highlighted by a red
color in yellow background. A manual pressure of the emergency stop button stops all loads from
rotating, thus preventing any accident which may occur. An alarm is also generated by the Unit
Controller. Releasing the emergency stop button enables the unit, which may be restarted only
after the alarm has been cleared on the controller.
The emergency stop causes all motors to stop, but does not switch off power to the unit. Do not
service or operate on the unit without having switched off the main switch.
1.3.2 Circuit safety devices
Safety of this level of severity will shut down the circuit they protect. The remaining circuits will
keep running.
1.3.3 Component safety devices
Safety of this level of severity will shut down a component against abnormal running condition that
could create permanent damages to it. An overview of the protecting devices is listed below:

Overcurrent/Overload Protections
Overcurrent/overload devices protect electrical motors used on compressors, fans and pumps
in case of overload or short circuit. In case of inverter-driven motors, overload and overcurrent
protection is integrated in the electronic drives. A further protection from short circuit is
accomplished by fuses or circuit breakers installed upstream each load or group of loads.

Overtemperature Protections
Compressor and fan electrical motors are also protected from overheating by thermistors
immersed into motor windings. Should the winding temperature exceed a fixed threshold, the
thermistors will trip and cause the motor to stop. High Temperature Alarm is recorded in the Unit
Controller only in case of compressors. Alarm must be reset from the controller.
Do not operate on a faulty fan before the main switch has been shut off. Overtemperature protection
is auto-reset, therefore a fan may restart automatically if temperature conditions allow it.

Phase reversal, under/over voltage, ground fault protections
When one of those alarms occurs the unit is immediately stopped or even inhibited to start. The
alarms clear automatically once the problem is fixed. This auto clear logic allows the unit to
automatically recover in case of temporary conditions where the supply voltage reaches the
upper or lower limit set on the protection device. In the other two cases a manual intervention
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
7
Air cooled inverter water chiller
OPERATION
MANUAL
on the unit will be required in order to solve the problem. In case of a phase reversal alarm two
phases requires to be inverted.
In the event of a power supply outage, the unit will restart automatically without the need for an
external command. However, any faults active when the supply is interrupted are saved and
may in certain cases prevent a circuit or unit from restarting.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons.

Flowswitch
The unit must be protected by a flowswitch. The flowswitch will stop the unit when the water
flow becomes lower than the minimum allowed flow. When the water flow is restored the flow
protection resets automatically. Exception is when the flowswitch opens with at least one
compressor running, in this case the alarm shall be cleared manually.

Freezing protection
Antifreeze protection prevents the water to freeze in the evaporator. It is automatically activated
when the water temperature (entering or leaving) at the evaporator drops below the antifreeze
limit. In freeze condition if the unit is in standby the evaporator pump will be activated to prevent
freezing of the evaporator. If the freeze condition will activate when the unit is running all the
unit will shut down in alarm while the pump will keep running. Alarm will automatically clear
when the freeze condition will clear.

Low pressure protection
If the circuit operates with a suction pressure lower than an adjustable limit for a certain time the
circuit safety logic will shut down the circuit and generate an alarm. The alarm requires a
manual action on the Unit Controller to be reset. Reset will take effect only if the suction
pressure is no longer lower that the safety limit.

High Pressure Protection
If the discharge pressure becomes too high and exceeds a limit which is linked with the
operational envelop of the compressor the circuit safety logic will try to prevent the alarm or, if
the corrective actions have no effect, it will shut down the circuit before the Mechanical High
Pressure switch will open. This alarm required a manual action on the Unit Controller to be
reset.

Mechanical High Pressure Switch
Each circuit is equipped with at least one high pressure switch which tries to prevent the relief
safety valve to open. When the discharge pressure becomes too high the Mechanical High
Pressure switch will open and immediately stop the compressor cutting the power supply to the
auxiliary relay. The alarm can be cleared as soon as the discharge pressure becomes normal
again. The alarm must be reset on the switch itself and on the Unit Controller. The triggering
pressure value cannot be changed.
Operation Manual
8
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller

OPERATION
MANUAL
Relief Safety Valve
If the pressure becomes too high in the refrigerant circuit, the relief valve will open to limit the
maximum pressure. If this happens switch off immediately the machine and contact your local
service organization.

Inverter fault
Each compressor can be equipped with its own inverter (integrated or external). The inverter
can automatically monitor its status and inform the Unit Controller in case of faults or pre-alarm
conditions. If this happen the Unit Controller will limit the compressor operation or eventually
switch off the circuit in alarm. A manual action on the controller will be needed in order to clear
the alarm.
1.4 Available sensors
1.4.1 Pressure transducers
Two types of electronic sensors are used to measure suction, discharge and oil pressure on each
circuit. The range of each sensor is clearly indicated on the sensor casing. Discharge and oil
pressures are monitored using a sensor of the same range.
1.4.2 Temperature sensors
The evaporator water sensors are installed in the entering and leaving side. An outdoor
temperature sensor is mounted inside the chiller. Additionally each circuit installs a suction and
discharge temperature sensors to monitor and control the superheated refrigerant temperatures.
On refrigerant-cooled inverters additional sensors immersed into the cooling plate measure the
temperature of the drives.
1.4.3 Thermistors
Each compressor is equipped with PTC thermistors which are immersed into motor windings for
motor protection. Thermistors trip to a high value in case the motor temperature reaches a
hazardous temperature.
1.4.4 Leak detectors
As an option the unit can be equipped with leak detectors to sense the air in the compressor cabin
and being able to identify a refrigerant leakage in that volume.
1.5 Available Controls
1.5.1 Evaporator pumps
The controller can regulate one or two evaporator pumps and takes care of automatic change-over
between pumps. It’s also possible to prioritize the pumps and temporarily disable one of the twos.
The controller is also able to control the pump speeds if the pumps are equipped with inverters.
1.5.2 Compressors
The controller can regulate one or two compressors installed on one or two independent refrigerant
circuit (one compressor per circuit). All the safeties of each compressor will be managed by the
controller. Embedded inverter safeties are handled by the inverter onboard electronic and only
notified to the UC.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
9
OPERATION
MANUAL
Air cooled inverter water chiller
1.5.3 Expansion Valve
The controller can regulate an electronic expansion valve per each refrigerant circuit. Microtech®
III embedded logic will always guarantee the best operation for the refrigerant circuit.
1.6 Customer Terminal Block Connections
1.6.1 General description
The contacts below are available at the user’s terminal block referred as MC24 or MC230 in the
wiring diagram. The following table summarises the connections at the user’s terminal block.
Description
Flow Switch
(mandatory)
Double setpoint
Current limit enable
External Fault
Rapid Restart Enable
(optional)
Back-up chiller
(optional)
LOC/BMS selection
(optional)
On-Off Remote
General Alarm
Terminals
EWAD TZ
708, 724
Terminals EWAD
TZ B
708, 724
Notes
703, 728
884, 885
881,884
764, 765
703,728
885, 891
881, 884
24 Vdc digital input
24 Vdc digital input
24 Vdc digital input
24 Vdc digital input
764, 763
24 Vdc digital input
24 Vdc digital input
894, 895
881-1, 834
24 Vdc digital input
540, 541
525, 526
540, 541
525, 526
Compressor #1 status
512, 513
512, 513
Compressor #2 status
514, 515
514, 515
Alarm Circuit #1
(optional)
Alarm Circuit #2
(optional)
Evaporator Pump #1
start
Evaporator Pump #2
start
Demand Limit
Current Limit (optional)
Setpoint Override
Pump VFD Signal
(optional)
560, 561
892, 896
560, 562
894, 899
806, 805
501, 530
806, 807
501, 531
888, 889
886, 890
886, 887
882, 883
888, 889
887, 886
890, 886
230 Vac digital input
NO digital output (24…230
Vac ext supply)
NO digital output (24…230
Vac ext supply)
NO digital output (24…230
Vac ext supply)
NO digital output (24…230
Vac ext supply)
NO digital output (24…230
Vac ext supply)
NO digital output (24 Vdc
internal supply)
NO digital output (24 Vdc
internal supply)
4-20 mA analog input
4-20 mA analog input
4-20 mA analog input
0-10 Vdc analog input
1.6.1.1 Flow Switch
Although the flow switch is offered as an optional, it is mandatory to install one and connect it to
the digital input terminals in order to enable chiller operation only when a minimum flow is sensed.
Operation Manual
10
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
Operating the unit by-passing the flow switch input or without an appropriate flow switch may
damage the evaporator due to freezing. Operation of the flow switch must be checked prior to start
up the unit.
1.6.1.2 Double setpoint
This contact can be used to switch between two different LWT setpoints and, depending on the
application, between different modes of operation.
Ice operation must be selected in case of ice storage application. In this case the UC will run the
chiller in on/off mode switching all the chiller off as soon as the setpoint is reached. In this case the
unit will run to full capacity and then will switch off applying an ice delay different chiller starts.
1.6.1.3 Current limit (optional)
This optional feature enables a capacity control of the unit in order to limit the input current. The
current limit feature is included in the Energy Meter option. The limiting signal will be compared
with a limiting value set on the HMI. By default the current limit setpoint is selected through the
HMI; an external 4-20 mA signal can be enabled to allow a remotely changeable setpoint.
1.6.1.4 External Fault
This contact is available to report to the UC a fault or a warning from an external device. It could be
an alarm coming from an external pump to inform the UC of the fault. This input can be configured
as a fault (unit stop) or a warning (displayed on the HMI without any action on the chiller).
1.6.1.5 Rapid Restart (optional)
Purpose of the rapid restart feature is to let the unit restart in the shortest possible time after a
power failure, and then recover in the shortest possible time (maintaining the reliability level of the
normal operations) the capacity it had before the power failure. The rapid restart is enabled by the
enable switch.
1.6.1.6 Remote On-Off
This unit can be started through a remote enable contact. The Q0 switch must be selected to
“Remote”.
1.6.1.7 General Alarm
In case of a unit alarm, this output is closed thus indicating a fault condition to an externally
connected BMS.
1.6.1.8 Compressor Status
The digital output is closed when the related circuit is in run state.
1.6.1.9 Alarm Circuit (optional)
This option is included with the “Rapid Restart” option. The related digital contact is closed in case
of alarm on a circuit.
1.6.1.10 Evaporator Pump Start
A 24 Vdc digital output (with internal supply) is enabled when a pump (#1 or #2) is required to start.
The output can be used to start an external pump (either at fixed or variable speed). The output
requires an external input or relay with less than 20 mA excitation current.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
11
Air cooled inverter water chiller
OPERATION
MANUAL
1.6.1.11 Demand limit
This optional function can be used to limit the unit capacity percentage to a changeable limit value.
This limitation cannot be directly linked to a corresponding limitation of the unit current (50%
demand limit can differ from 50% of the unit FLA).
The demand limit signal can be changed continuously between 4 and 20 mA. The Microtech III will
convert this signal into a unit capacity limitation changing between minimum capacity and full
capacity with a linear relationship. A signal between 0 and 4mA will correspond to a full unit
capacity, in this way if nothing is connected to this input no limitation will be applied. The maximum
limitation will never force a unit shutdown.
1.6.1.12 Setpoint override
This input allows to apply an offset on the Active Setpoint to adjust the operating point of the
ELWT. This input can be used to maximize the comfort.
1.6.1.13 Pump VFD Signal (optional)
When the inverter kit option is required, by default the speed control is customer supplied. The
“Pump VFD Signal” terminals allow the customer to connect an external speed reference wire to
the inverter. These terminals are placed inside the main electrical panel.
Operation Manual
12
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
2 GENERAL DESCRIPTION
2.1 General
Microtech® III is a system for controlling single or dual-circuit air-cooled liquid chillers. Microtech®
III controls compressor start-up necessary to maintain the desired heat exchanger leaving water
temperature. In cooling mode it controls the operation of the fans to maintain the correct
condensing pressure in each circuit.
Safety devices are constantly monitored by Microtech® III to ensure their safe operation.
Microtech® III also gives access to a Test routine covering all inputs and outputs. All Microtech® III
controls can work in accordance with three independent modes:


Local mode: the machine is controlled by commands from the user interface.
Remote mode: the machine is controlled by remote contacts (volt-free contacts).
Network mode: the machine is controlled by commands from a BAS system. In this case, a data
communication cable is used to connect the unit to the BAS.
When the Microtech® III system operates autonomously (Local or Remote mode) it retains all of its
own control capabilities but does not offer any of the features of the Network mode.
2.2 Abbreviations used
In this manual, the refrigeration circuits are called circuit #1 and circuit #2. The compressor in
circuit #1 is labelled Cmp1. The other in circuit #2 is labelled Cmp2.
The following abbreviations are used frequently:
UC
HMI
CP
EP
CSRT
ESRT
ST
DT
SSH
DSH
EXV
ELWT
EEWT
Unit controller (Microtech III)
Human Machine Interface
Condensing Pressure
Evaporating Pressure
Condensing Saturated Refrigerant Temperature
Evaporating Saturated Refrigerant Temperature
Suction Temperature
Discharge Temperature
Suction SuperHeat
Discharge Superheat
Electronic Expansion Valve
Evaporator Leaving Water Temperature
Evaporator Entering Water Temperature
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
13
OPERATION
MANUAL
Air cooled inverter water chiller
2.3 Controller Operating Limits
Operation (IEC 721-3-3):





Temperature -40...+70 °C
Restriction LCD -20… +60 °C
Restriction Process-Bus -25….+70 °C
Humidity < 90 % r.h (no condensation)
Air pressure min. 700 hPa, corresponding to max. 3,000 m above sea level
Transport (IEC 721-3-2):



Temperature -40...+70 °C
Humidity < 95 % r.h (no condensation)
Air pressure min. 260 hPa, corresponding to max. 10,000 m above sea level.
2.4 Controller Architecture
The overall controller architecture is the following:




One MicroTech III main controller
I/O extensions as needed depending on the configuration of the unit
Communications interface(s) as selected
Peripheral Bus is used to connect I/O extensions to the main controller.
Controller/
Extension Module
Main Controller
EEXV Module 1
EEXV Module 2
Extension Module
Rapid Restart Module
Siemens Part Number
EWAD TZ
POL687.70/MCQ
POL94U.00/MCQ
POL94U.00/MCQ
POL965.00/MCQ
POL945.00/MCQ
EWAD TZ B
POL687.70/MCQ
POL98U.00/MCQ
POL98U.00/MCQ
-
Address
n/a
3
4
5
22
Usage
Used on all configurations
Used on all configurations
Used when configured for 2 circuits
Used on all configurations
Used with Rapid Restart option
Operation Manual
14
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
All boards are supplied from a common 24 Vac source. Extension boards can be directly powered
by the Unit Controller. All boards can be also supplied by a 24Vdc source.
CAUTION: Maintain the correct polarity when connecting the power supply to the boards,
otherwise the peripheral bus communication will not operate and the boards may be
damaged.
2.5 Communication Modules
Any of the following modules can be connected directly to the left side of the main controller to
allow a BAS or other remote interface to function. Up to three can be connected to the controller at
a time. The controller should automatically detect and configure itself for new modules after
booting up.
Removing modules from the unit will require manually changing the
cshouldonfiguration.
Module
BacNet/IP
Lon
Modbus
BACnet/MSTP
Siemens Part Number
POL908.00/MCQ
POL906.00/MCQ
POL902.00/MCQ
POL904.00/MCQ
Usage
Optional
Optional
Optional
Optional
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
15
OPERATION
MANUAL
Air cooled inverter water chiller
3 Using the Controller
The control system consists of a unit controller (UC) equipped with a set of extension modules that
implement additional features. All boards communicate via an internal peripheral bus with the UC.
The Microtech III continuously manages the information received from the various pressure and
temperature probes installed on the compressors and communicated to the unit . The UC
incorporates a program that controls the unit.
The standard HMI consists of an inbuilt display (A) with 3 buttons (B) and a push’n’roll control (C).
UC
A
B C
The keypad/display (A) consists of a 5-line by 22 character display.
The function of the three buttons (B) is described below:



Alarm status (from any page it links with the page with alarm list, alarm log and alarm
snapshot if available)
Back to Main Page
Back to the previous level (it can be the Main Page)
The push’n’roll command (C) is used to scroll between the different menu pages, settings and data
available on the HMI for the active password level. Rotating the wheel allows to navigate between
lines on a screen (page) and to increase and decrease changeable values when editing. Pushing
the wheel acts as an Enter Button and will jump from a link to the next set of parameters.
3.1 General Recommendation
Before switching on the unit read the following recommendations:




When all the operations and all the settings have been carried out, close all the switchbox
panels
The switchbox panels can only be opened by trained personnel
When the UC requires to be accessed frequently the installation of a remote interface is
strongly recommended
Evaporator, compressors and related inverters are protected from freezing by electrical
heaters. These heaters are supplied through unit main supply and temperature controlled
by thermostat or by the unit controller. Also the LCD display of the unit controller may be
damaged by extremely low temperatures. For this reason, it is strongly recommended to
never power off the unit during winter, especially in cold climates.
Operation Manual
16
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
3.2
Navigating
When power is applied to the control circuit, the controller screen will be active and display the
Home screen, which can also be accessed by pressing the Menu Button The navigating wheel is
the only navigating device necessary, although the MENU, ALARM, and BACK buttons can
provide shortcuts as explained previously.
An example of the HMI screens is shown in the following picture.
M a
E n t
U n i
O f
A c t
i
e
t
f
i
n
r
M
P
S t
:
U
v e
e
a
a
n
S
n
s
t
i
e
u
s w o r d
u s =
t
S W
t p t =
1 / 11

7 . 0 ° C
A bell ringing in the top right corner will indicate an active alarm. If the bell doesn’t move it means
that the alarm has been acknowledged but not cleared because the alarm condition hasn’t been
removed.
M a
E n t
U n i
O f
A c t
i
e
t
f
i
n
r
M
P
S t
:
U
v e
e
a
a
n
S
n
s
t
i
e
1 / 

u
s w o r d
u s =
t
S W
t p t =
7 . 0 ° C
The active item is highlighted in contrast, in this example the item highlighted in Main Menu is a
link to another page. By pressing the push’n’roll, the HMI will jump to a different page. In this case
the HMI will jump to the Enter Password page.
E n t e r
E n t e r
P a s s w o r d
2 / 2
P W
* * * *
3.3 Passwords
The HMI structure is based on access levels that means that each password will disclose all the
settings and parameters allowed to that password level. Basic informations about the status
including the active alarm list, active setpoint and controlled water temperature can be accessed
without the need to enter the password.
The user UC handles two level of passwords:
USER
5321
MAINTENANCE 2526
The following information will cover all data and settings accessible with the maintenance
password. User password will disclose a subset of the settings explained in chapter 4.
In the Enter Password screen, the line with the password field will be highlighted to indicate that
the field on the right can be changed. This represents a setpoint for the controller. Pressing the
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
17
OPERATION
MANUAL
Air cooled inverter water chiller
push’n’roll the individual field will be highlighted to allow an easy introduction of the numeric
password. By changing all fields, the 4 digits password will be entered and, if correct, the additional
settings available with that password level will be disclosed.
E n t e r
E n t e r
P a s s w o r d
P W
2 / 2
5 * * *
The password will time out after 10 minutes and is cancelled if a new password is entered or the
control powers down. Entering an invalid password has the same effect as continuing without a
password.
Once a valid password has been entered, the controller allows further changes and access without
requiring the user to enter a password until either the password timer expires or a different
password is entered. The default value for this password timer is 10 minutes. It is changeable from
3 to 30 minutes via the Timer Settings menu in the Extended Menus.
3.4 Editing
The Editing Mode is entered by pressing the navigation wheel while the cursor is pointing to a line
containing an editable field. Once in the edit mode pressing the wheel again causes the editable
field to be highlighted. Turning the wheel clockwise while the editable field is highlighted causes
the value to be increased. Turning the wheel counter-clockwise while the editable field is
highlighted causes the value to be decreased. The faster the wheel is turned the faster the value is
increased or decreased. Pressing the wheel again cause the new value to be saved and the
keypad/display to leave the edit mode and return to the navigation mode.
A parameter with an “R” is read only; it is giving a value or description of a condition. An “R/W
indicates a read and/or write opportunity; a value can be read or changed (providing the proper
password has been entered).
Example 1: Check Status, for example -is the unit being controlled locally or by an external
network? We are looking for the Unit Control Source Since this a unit status parameter, start at
Main Menu and select View/Set Unit and press the wheel to jump to the next set of menus. There
will be an arrow at the right side of the box, indicating that a jump to the next level is required.
Press the wheel to execute the jump.
You will arrive at the Status/ Settings link. There is an arrow indicating that this line is a link to a
further menu. Press the wheel again to jump to the next menu, Unit Status/Settings.
Rotate the wheel to scroll down to Control Source and read the result.
Example 2: Change a Set point, the chilled water set point for example. This parameter is
designated as Cool LWT Set point 1 and is a unit set parameter. From the Main Menu select
View/Set Unit. The arrow indicated that this is link to a further menu.
Press the wheel and jump to the next menu View/Set Unit and use the wheel to scroll down to
Temperatures. This again has an arrow and is a link to a further menu. Press the wheel and jump
Operation Manual
18
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
to the Temperatures menu, which contains six lines of temperatures set points. Scroll down to Cool
LWT 1 and press the wheel to jump to the item change page. Rotate the wheel to adjust the set
point to the desired value. When this is done press the wheel again to confirm the new value. With
the Back button it will be possible to jump back to the Temperatures menu where the new value
will be displayed.
Example 3: Clear an Alarm,. The presence of a new alarm is indicated with a Bell ringing on the
top right of the display. If the Bell is frozen one or more alarm had been acknowledged but are still
active. To view the Alarm menu from the Main Menu scroll down to the Alarms line or simply press
the Alarm button on the display. Note the arrow indicating this line is a link. Press the wheel to
jump to the next menu Alarms There are two lines here; Alarm Active and Alarm Log. Alarms are
cleared from the Active Alarm link. Press the wheel to jump to the next screen. When the Active
Alarm list is entered scroll to the item AlmClr which is set to off by default. Change this value to on
to acknowledge the alarms. If the alarms can be cleared then the alarm counter will display 0
otherwise it will display the number of alarm still active. When the alarms are acknowledged the
Bell on the top right of the display will stop to ring if some of the alarms are still active or will
disappear if all the alarms are cleared.
3.5 Basic Control System Diagnostic
MicroTech III controller, extension modules and communication modules are equipped with two
status LED (BSP and BUS) to indicate the operational status of the devices. The BUS LED
indicates the status of the communication with the controller. The meaning of the two status LED is
indicated below.
UC BSP LED
BSP LED
Solid Green
Solid Yellow
Solid Red
Flashing Green
Flashing Yellow
Flashing Yellow/Red
Flashing Red
Flashing Red/Green
(*) Contact Service.
Mode
Application running
Application loaded but not running (*) or BSP Upgrade mode active
Hardware Error (*)
BSP startup phase. The controller needs time for starting.
Application not loaded (*)
Fail safe mode (in case that the BSP upgrade was interrupted)
BSP Error (software error*)
Application/BSP update or inizialization
Extension modules
BSP LED
BSP LED
Solid Green
Solid Red
Flashing Red
Flashing Red/Green
Mode
BSP running
Hardware Error (*)
BSP Error (*)
BSP upgrade mode
BUS LED
BUS LED
Solid Green
Solid Yellow
Solid Red
Mode
Communication running, I/O working
Communication running but parameter from the application wrong or missing, or uncorrect factory calibration
Communication down (*)
Communication modules
BSP LED (same for all modules)
BSP LED
Solid Green
Solid Yellow
Solid Red
Mode
BPS running, communication with controller
BSP running, no communication with controller (*)
Hardware Error (*)
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
19
Air cooled inverter water chiller
Flashing Red
Flashing Red/Green
(*) Contact Service.
OPERATION
MANUAL
BSP Error (*)
Application/BSP update
LON module BUS LED
BUS LED
Solid Green
Mode
Ready for Communication. (All Parameter loaded, Neuron configured). Doesn't indicate a communication
with other devices.
Startup
No Communication to Neuron (internal error, could be solved by downloading a new LON application)
Communication not possible to the Neuron. The Neuron must be configured and set online over the LON
Tool.
Solid Yellow
Solid Red
Flashing
Yellow
Bacnet MSTP BUS LED
BUS LED
Solid Green
Solid Yellow
Solid Red
Mode
Ready for Communication. The BACnet Server is started. It doesn't indicate a active communication
Startup
BACnet Server down. Automatically a restart after 3 seconds are initiated.
Bacnet IP BUS LED
BUS LED
Solid Green
Solid Yellow
Solid Red
Mode
Ready for Communication. The BACnet Server is started. It doesn't indicate a active communication
Startup. The LED stays yellow until the module receives a IP Address, therefore a link must be established.
BACnet Server down. Automatic restart after 3 seconds is initiated.
Modbus BUS LED
BUS LED
Solid
Green
Solid
Yellow
Solid Red
Mode
All Communication running
Startup, or one configured channel not communicating to the Master
All configured Communications down. Means no communication to the Master. The timeout can be configured.
In case that the timeout is zero the timeout is disabled.
Operation Manual
20
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
3.6 Controller maintenance
The controller requires to maintain the installed battery. Every two years it’s required to replace
the battery. Battery model is: BR2032 and it is produced by many different vendors.
To replace the battery remove the plastic cover of the controller display using a screw driver as
shown in the following pictures:
Be careful to avoid damages to the plastic cover. The new battery shall be placed in the proper
battery holder which is highlighted in the following picture, respecting the polarities indicated
into the holder itself.
3.7 Optional Remote User Interface
As an option an external Remote HMI can be connected on the UC. The Remote HMI offers the
same features as the inbuilt display plus the alarm indication done with a light emitting diode
located below the bell button.
MicroTech® III


Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
21
Air cooled inverter water chiller
OPERATION
MANUAL
The Remote can be ordered with the unit and shipped loose as a field installed option. It can also
be ordered any time after chiller shipment and mounted and wired on the job as explained on the
following page. The remote panel is powered from the unit and no additional power supply is
required.
All viewing and setpoint adjustments available on the unit controller are available on the remote
panel. Navigation is identical to the unit controller as described in this manual.
The initial screen when the remote is turned on shows the units connected to it. Highlight the
desired unit and press the wheel to access it. The remote will automatically show the units
attached to it, no initial entry is required.
The Remote HMI can be extended up to 700m using the process bus connection available on the
UC. With a daisy-chain connection as below, a single HMI can be connected to up to 8 units. Refer
to the specific HMI manual for details.
3.8 Embedded Web Interface
The MicroTech III controller has an embedded web interface that can be used to monitor the unit
when connected to a local network. It is possible to configure the IP addressing of the MicroTech III
as a fixed IP of DHCP depending on the network configuration.
With a common web browser a PC can connect with the unit controller entering the IP address of
the controller or the host name, both visible in the “About Chiller” page accessible without entering
a password.
When connected it will be required to enter a user name and a password as shown in the picture
below:
Enter the following credential to get access to the web interface:
User Name: ADMIN
Password: SBTAdmin!
The following page will be displayed:
Operation Manual
22
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
The page is a copy of the onboard HMI and follows the same rules in terms of access levels and
structure.
In addition it allows to trend log a maximum of 5 different quantities. It’s required to click on the
value of the quantity to monitor and the following additional screen will become visible:
Depending on the web browser and its version the trend log feature may not be visible. It’s
required a web browser supporting HTML 5 like for example:



Microsoft Internet Explorer v.11,
Google Chrome v.37,
Mozilla Firefox v.32.
These software are only an example of the browser supported and the versions indicated have to
be intended as minimum versions.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
23
OPERATION
MANUAL
Air cooled inverter water chiller
4 Menu Structure
All settings are divided in different menus. Each menu collects in a single page other sub-menus,
settings or data related to a specific function (for example Power Conservation or Setup) or entity
(for example Unit or Circuit). In any of the following pages a grey box will indicate changeable
values and the defaults.
4.1 Main Menu
Setpoint/SubMenu
Enter Password
View/Set Unit
View/Set Circuit
Unit Status=
Default
Range
Active Setpoint=
MS Ctrl Tmp=
7.0°C, 
-273.1°C, 
Auto
Off: Ice Mode Tmr
Off: OAT Lockout
Off: All Cir Disabled
Off: Unit Alarm
Off: Keypad Disable
Off: Master Disable
Off: BAS Disable
Off: Unit Sw
Off: Test Mode
Off: Schedule Disable
Auto: Noise Reduction
Auto: Wait For Load
Auto: Evap Recirc
Auto: Wait For Flow
Auto: Pumpdn
Auto: Max Pulldn
Auto: Unit Cap Limit
Auto: Current Limit
-
Evaporator LWT=
-273.1°C, 
-
0.0%,
Cool, 
Enable, 




-



Off: Unit
Sw
Unit Capacity=
Unit Mode=
Unit Enable=
Timers
Alarms
Commission Unit
About Chiller
Description
Submenu to activate access levels
Submenu for unit data and settings
Submenu for circuit data and settings
Status of the Unit
Water temperature active setpoint + link to Setpoint page
Master slave controlled temperature + link to Master Slave Data
page
Evaporator leaving water temperature + link to Temperatures
page
Unit capacity + link to Capacity page
Unit Mode + link to Available modes page
Unit Enable + link to unit enable page
Submenu for unit timers
Submenu for alarms; same function as Bell Button
Submenu for commission unit
Application Info submenu
4.2 View/Set Unit
Setpoint/Sub-Menu
Thermostat Ctrl
Network Ctrl
Vfd Settings
Pumps
Master/Slave
Rapid Restart
Date/Time
Scheduler
Power Conservation
Electrical Data
Ctrlr IP Setup
Daikin on Site
Menu Password
Default
Range













-
Description
Submenu for Thermostatic control
Submenu for Network control
Submenu Vfd installation settings
Submenu for pump settings
Submenu for Master Slave data and settings
Submenu for Rapid Restart Option
Submenu Date, Time and Quiet Night mode schedule
Submenu for Time Scheduler
Submenu Unit Limiting functions
Submenu for electrical data
Submenu for controller IP-address setup
Submenu for connection to Daikin cloud DoS
Submenu Disable Password for User level
4.2.1 Thermostat Ctrl
This page resumes all the parameters related to the unit thermostatic control.
Operation Manual
24
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Setpoint/SubMenu
Start Up DT=
Shut Dn DT=
Stg Up DT=
Stg Dn DT=
Stg Up Delay=
Stg Dn Delay=
Strt Strt Dly=
Stop Strt Dly=
Ice Cycle Dly=
Lt Ld Stg Dn %=
Hi Ld Stg Up %=
Max Ckts Run=
C1 Sequence #=
C2 Sequence #=
Next Crkt On=
Next Crkt Off=
Default
Range
2.7°C
1.0°C
0.5°C
1.0°C
5 min
3 min
20min
5min
12h
40%
80%
2
1
1
0
0
Description
0.0…5.0°C
0.0…1.7°C
0.0…1.7°C
0.0…1.7°C
0…60 min
3…30 min
1…23h
20…50%
50…100%
1…2
1…2
1…2
-
Offset to start thermostat control
Offset to standby
Offset to allow compressor starts
Offset to force one compressor off
Compressor start interstage
Compressor stop interstage
Compressor Start to Start delay
Compressor Stop to Start delay
Ice cycle delay
Circuit capacity threshold to stage down one compressor
Circuit capacity threshold to stage up one compressor
Limit to the number of circuit to be used
Manual sequence of circuit #1
Manual sequence of circuit #2
Shows next circuit to be started up
Shows next circuit number to be stopped
4.2.2 Network Ctrl
This page resumes all settings related to thermostat control.
Setpoint/Sub-Menu
Control Source=
Act Ctrl Src=
Netwrk En SP=
Netwrk Mode SP=
Netwrk Cool SP=
Netwrk Cap Lim=
Netwrk HR SP=
Netwrk Ice SP=
Netwrk Current SP=
Remote Srv En=
Default
Local
Local
Disable
Cool
6.7°C
100%
45.0°C
-4.0°C
800A
Disable
Range
Local, Network
Local, Network
Enable, Disable
Enable, Disable
Description
Local Network control selection
Actual control between Local Network
Enable unit command from BMS
Cool, Ice, Heat (NA), Cool/Heat Recovery
Cooling setpoint from BMS
Capacity limitation from BMS
Heat recovery setpoint from BMS
Ice setpoint from BMS
Sepoint for current limitation from BMS
Remote server enable
4.2.3 Vfd Settings
This page contains basics Vfd Settings. It will be possible to set the Modbus address of each
inverter installed on compressors. This function is supposed to be activated in case of compressor
replacement. The page will also contain the Modbus setup parameters like baud rate, parity etc.
Setpoint/Sub-Menu
Baud Rate=
Set Inv1 Fltr=
Hold
Range
4800, 9600,
19200, 38400,
None, Odd,
Even
No, Yes
Active,
Passive
Hold, Exec
Set Inv2 Fltr=
Hold
Hold, Exec
Parity=
Default
19200
None
Two Stop Bits=
485 Resistance=
No
Active
Description
Modbus communication speed
Parity
Number of stop bits
RS485 Termination resistance
Command to enable communication filter on the
compressor 1
Command to enable communication filter on
the
compressor 2
4.2.4 Pumps
This page contains the settings to define the operation of the primary/backup pumps, the running
hours of each pump and all parameters to configure the behavior of the pump driven with an
inverter.
Setpoint/SubMenu
Evp Pmp Ctrl=
Evap Recirc Tm=
Evap Pmp 1 Hrs=
Evap Pmp 2 Hrs=
Default
#1
Only
30s
0h
0h
Range
#1 Only, #2 Only, Auto, #1 Primary, #2
Primary
Description
Set number of pumps operational and which priority.
Auto se
Water recirculating timer
Running Hours Pump 1 (if present)
Running Hours Pump 2 (if present)
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
25
OPERATION
MANUAL
Air cooled inverter water chiller
Speed 1=
Speed 2=
Thermo Off Speed=
Plant PD=
Plant PD Sp=
Evap PD=
Min Evap PD=
Hysteresis
Pump Speed=
Min Speed=
Max Speed=
Mode=
Manual Speed=
Sns Scale=
Bypass
80%
60%
50%
0kPa
0kPa
0kPa
0%
100%
Auto
0%
200kPa
Open
0-100%
0-100%
0-100%
0-1000kPa
0-1000kPa
0-1000kPa
0-100%
0-100%
Auto-Manual
0-100%
0-2000kPa
Open,Close
Speed when the input Double Speed Switch is open
Speed when the input Double Speed Switch is close
Speed when there are no compressors running
Actual Plant Pressure Measurements
Plant Pressure Drop Setpoint
Actual Evaporator Pressure Drop Measurements
Minimum Evaporator Pressure Drop setpoint
Hysteresis value for bypass value
Actual Pump Speed
Minimum Pump Speed
Maximum Pump Speed
Pump mode
Manual Pump Speed
Plant Pressure Drop Sensor Scale
Bypass valve state
4.2.5 Master/Slave
All data and parameters available in this sub-menus are related to the Master Slave function. Refer
to Master Slave manual for more details.
Setpoint/SubMenu
Data
Options
Thermostat Ctrl
Timers
Standby Chiller
Disconnect Unit
Default
Range





No
No,Yes
Description
Submenu Data. This link is available only on the Master unit
Submenu Options. This link is available only on the Master unit
Submenu Thermostat Ctrl. This link is available only on the Master unit
Submenu Timers. This link is available only on the Master unit
Submenu Standby Chiller. This link is available only on the Master unit
Parameter to disconnect the unit by the Master Slave system.
When this parameter is set to Yes the unit follows all local settings.
4.2.5.1 Data
In this menu are collected all main data related to Master Slave function.
Setpoint/SubMenu
Next On=
Default
-
Range
Next Off=
-
Standby=
-
Switch Date
Switch Time
-
-,Master, Slave 1, Slave 2,
Slave 4
-,Master, Slave 1, Slave 2,
Slave 4
-,Master, Slave 1, Slave 2,
Slave 4
dd/mm/yyyy
hh:mm:ss
Plan Load=
Avg EWT
Mst State=
Sl1 State=
Sl2 State=
Sl3 State=
Mst Standalone=
Sl1 Standalone
Sl2 Standalone
Sl3 Standalone
Mst Load=
Sl1 Load=
Sl2 Load=
Sl3 Load=
Mst LWT=
Sl1 LWT=
Sl2 LWT=
Sl3 LWT=
Mst EWT=
-
0%...100%
Off, On, Alarm, Comm Err
Off, On, Alarm, Comm Err
Off, On, Alarm, Comm Err
Off, On, Alarm, Comm Err
No, Yes
No, Yes
No, Yes
No, Yes
0%...100%
0%...100%
0%...100%
0%...100%
-
Description
Display next chiller that will be starts
Display next chiller that will be stopped
Display the actual standby chiller
Display the day in which the standby chiller will be cycled
Display at which time of the switch day the standby chiller will be
cycled
Display the actual plant load
Display the actual average entering water temperature value
Display the actual state of the Master
Display the actual state of the Slave 1
Display the actual state of the Slave 2
Display the actual state of the Slave 3
Display if the standalone mode if active on the Master
Display if the standalone mode if active on the Slave 1
Display if the standalone mode if active on the Slave 2
Display if the standalone mode if active on the Slave 3
Display the actual load of the Master
Display the actual load of the Slave 1
Display the actual load of the Slave 2
Display the actual load of the Slave 3
Display the Master leaving water temperature
Display the Slave1 leaving water temperature
Display the Slave2 leaving water temperature
Display the Slave3 leaving water temperature
Display the Master entering water temperature
Operation Manual
26
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Sl1 EWT=
Sl2 EWT=
Sl3 EWT=
Master Hrs=
Slave 1 Hrs=
Slave 2 Hrs=
Slave 3 Hrs=
Master Starts=
Slave 1 Starts=
Slave 2 Starts=
Slave 3 Starts=
-
-
Display the Slave1 entering water temperature
Display the Slave2 entering water temperature
Display the Slave3 entering water temperature
Master running hours
Slave 1 running hours
Slave 2 running hours
Slave 3 running hours
Master number of starts
Slave 1 number of starts
Slave 2 number of starts
Slave 3 number of starts
4.2.5.2 Options
This menu allows to set main parameter of Master Slave funtion
Setpoint/SubMenu
Master Priority=
Default
Range
1
1…4
Slave 1 Priority=
1
1…4
Slave 2 Priority=
1
1…4
Slave 3 Priority=
1
1…4
Master Enable=
Enable
Control Mode=
Complete
Control Tmp=
Leaving
Enable
Disable
Partial
Complete
Entering
Leaving
Description
Start Up / Shut Down priority of the chiller Master
Priority = 1  highest priority
Priority = 4  lowest priority
Start Up / Shut Down priority of the chiller Slave 1
Priority = 1  highest priority
Priority = 4  lowest priority
Start Up / Shut Down priority of the chiller Slave 2.
Priority = 1  highest priority
Priority = 4  lowest priority
This menu is visible only if the parameter M/S Num Of Unit has been configured at
least with value 3
Start Up / Shut Down priority of the chiller Slave 3.
Priority = 1  highest priority
Priority = 4  lowest priority
This menu is visible only if the parameter M/S Num Of Unit has been configured at
least with value 4
This parameter allows to enable or disable locally the Master Chiller
Parameter to select the Partial or Complete control mode
Partial  On/Off control
Complete  On/Off + Capacity control
Parameter to define the controlled temperature
Entering - Thermoregulations is based on the Average Entering Water Temperature
(AEWT)
Leaving - Thermoregulation is based on the Common Leaving Water Temperature
(CLWT)
4.2.5.3 Thermostat Ctrl
This page resumes all thermostat control parameter of Master Slave.
Setpoint/SubMenu
Stage Up DT=
Stage Dn DT =
Dead Band =
Default
2.7°C
1.5°C
0.2
Range
Description
Offset respect the active setpoint for the unit startup.
Offset respect the active setpoint for the unit shutdown.
Dead Band respect the active setpoint within which the load/unload
command are no longer generated
Threshold of load that have to reach all units running before start of
a new chiller
Minimum time between the start of two chillers
Minim time between the stop of two chillers
Minimum Evaporator leaving water temperature
Threshold=
60%
0.5…5.0°C
0.5…5.0°C
0.1 - Min(Stage UP DT, Stage Dn
DT)
30...100%
Stage Up Time=
Stage Dn Time=
Min Evap Tmp=
5min
5min
4.0
0min…20min
0min…20min
-18…30°C
4.2.5.4 Timers
Setpoint/SubMenu
Stage Up Timer=
Stage Dn Timer=
Clear Timers=
Default
Off
Range
Description
Off
Reset
Current delay for new chiller stage up
Current delay for new chiller stage down
This command, visible only with service password, can be used to reset the Stage Up/Dn
Timer.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
27
OPERATION
MANUAL
Air cooled inverter water chiller
4.2.5.5 Standby Chiller
This menu allows to configure the standby chiller
Setpoint/SubMenu
Standby Chiller=
Default
No
Cycling Type=
Time
Interval Time=
7 Days
Switch Time=
Tmp Cmp=
Tmp Comp Time=
Standby Reset=
00:00:00
No
120 min
Off
Range
Description
No, Auto, Master, Slave 1, Slave 2,
Slave 3
Run Hours, Sequence
Standby chiller selection
Cycling type of standby chiller if previous parameter Standby
Chiller is set as Auto
Define the interval time (expressed in day) for the cycling of
standby chiller
Define the time within the day when will be performed the
switch of the standby chiller
Enabling of Temperature Compensation function
Time constant of Temperature Compensation function
Parameter to reset standby chiller cycling timer
1…365
00:00:00…23:59:59
No,Yes
0…600
Off, Reset
4.2.6 Rapid Restart
This page shows if the function Rapid Restart is enabled by external contact and it allows to define
the maximum black out time in order to recover quickly the unit load.
Setpoint/Sub-Menu
Rapid Restart=
Pwr Off Time=
Default
Disable
60s
Range
Enable, Disable
-
Description
Feature enable if Rapid Restart is installed
Maximum black out time to enable Rapid Restart
4.2.7 Date/Time
This page will allow to adjust the time and date in the UC. This time and date will be used in the
alarm log and to enable and disable the Quiet Mode. Additionally it’s also possible to set the
starting and ending date for the DayLight Saving time (DLS) if used.
Quiet Mode is a feature that is used to reduce the chiller noise. This is done by applying the
maximum setpoint reset to the cooling setpoint and increasing the condenser temperature target
by an adjustable offset.
Setpoint/Sub-Menu
Actual Time=
Actual Date=
UTC Diff=
DLS Enable=
DLS Strt Month=
DLS Strt Week=
DLS End Month=
DLS End Week=
Quiet Mode=
QM Start Hr=
QM Start Min=
QM End Hr=
QM End Min=
QM Cond Offset=

Default
12:00:00
01/01/2014
-60min
Yes
Mar
2ndWeek
Nov
1stWeek
Disable
21h
0min
6h
0min
5°C
Range
NA, Jan…Dec
1st…5th week
Disable, Enable
18…23h
0…59min
5…9h
0…59min
0.0…14.0°C
Description
Difference with UTC
No, Yes
DayLight Saving time start month
DayLight Saving time start week
DayLight Saving time end month
DayLight Saving time end week
Activate Quiet Mode
Quiet Mode start hour
Quiet Mode start minute
Quiet Mode end hour
Quiet Mode end minute
Quiet Mode condenser target offset
On board real time clock settings are maintained thanks to a battery mounted on the controller.
Make sure that the battery is replaced regularly each 2 years (see section 3.6).
Operation Manual
28
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
4.2.8 Scheduler
This page allows to program the time scheduler
Setpoint/Sub-Menu
Actual State
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Default
Off







Range
Off, On Setpoint 1, On Setpoint 2
-
Description
Actual state provided by the time scheduler
Link to Monday scheduler programming page
Link to Tuesday scheduler programming page
Link to Wednesday scheduler programming page
Link to Thursday scheduler programming page
Link to Friday scheduler programming page
Link to Saturday scheduler programming page
Link to Sunday scheduler programming page
Table below reports the menu used to program daily time slots. Six time slots can be programmed
by the user.
Setpoint/Sub-Menu
Time 1
Value 1
Time 2
Value 2
Time 3
Value 3
Time 4
Value 4
Time 5
Value 5
Time 6
Value 6
Default
*:*
Off
*:*
Off
*:*
Off
*:*
Off
*:*
Off
*:*
Off
Range
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
0:00..23:59
Off, On Setpoint 1, On Setpoint 2
Description
Define the starting time of 1st time slot
Define the unit state during 1st time slot
Define the starting time of 2nd time slot
Define the unit state during 2nd time slot
Define the starting time of 3rd time slot
Define the unit state during 3rd time slot
Define the starting time of 4th time slot
Define the unit state during 4th time slot
Define the starting time of 5th time slot
Define the unit state during 5th time slot
Define the starting time of 6th time slot
Define the unit state during 6th time slot
4.2.9 Power Conservation
This page resumes all the settings that allows chiller capacity limitations. Further explanations of
the setpoint reset options can be found in the chapter 7.2.
Setpoint/Sub-Menu
Unit Capacity=
Demand Lim En=
Demand Limit=
Unit Current=
Current Limit=
Flex Current Lm=
Current Lim Sp=
Setpoint Reset=
Max Reset=
Start Reset DT=
Max Reset OAT=
Strt Reset OAT=
Softload En=
Softload Ramp=
Starting Cap=
Default
100.0%
Disable
100.0%
0.0A
800A
Disable
800A
None
5.0°C
5.0°C
15.5°C
23.8°C
Disable
20min
40.0%
Range
Disable, Enable
Disable, Enable
0…2000A
None, 4-20mA, Return, OAT
0.0…10.0°C
0.0…10.0°C
10.0…29.4°C
10.0…29.4°C
Disable, Enable
1…60min
20.0…100.0%
Description
Demand Limit Enable
Demand Limit Mode - Active demand limitation
Current Limit Mode (optional) - Unit current reading
Current Limit Mode (optional) - Active Current limit
Flexible Current Limit Enable
Current Limit Mode (optional) - Current limit setpoint
Setpoint Reset Type
Setpoint Reset Mode - Max Reset of water temp. setpoint
Setpoint Reset Mode - Evaporator DT at which no reset is applied
Setpoint Reset Mode - OAT at which the max reset is applied
Setpoint Reset Mode - OAT at wich 0°C reset is applied
Soft Load Mode Enable
Soft Load Mode - Duration of the Softload ramp
Soft Load Mode - Starting capacity limit for Softload
4.2.10 Electrical Data
This page resumes the electrical data taken from the energy meter if the option has been enabled
and the energy meter is installed properly.
Setpoint/Sub-Menu
Average Voltage
Average Current
Active Power
Cosphi
Average Power
Active Energy
Default
Range
Description
Average voltage on the three phases
Average current on the three phases
Instantaneous active power
Unit Power Factor
Average power
Active Energy accumulated
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
29
OPERATION
MANUAL
Air cooled inverter water chiller
4.2.11 Controller IP setup
The Microtech ® III controller has an embedded web server showing a replica of the onboard HMI
screens. To access to this additional web HMI can be required to adjust the IP settings to match
the settings of the local network. This can be done in this page. Please contact your IT department
for further information on how to set the following setpoints.
To activate the new settings a reboot of the controller is required, this can be done with the Apply
Changes setpoint.
The controller also supports DHCP, in this case the name of the controller must be used.
Setpoint/Sub-Menu
Apply Changes=
DHCP=
Act IP=
Act Msk=
Act Gwy=
Gvn IP=
Gvn Msk=
Gvn Gwy=
PrimDNS
SecDNS
Name
MAC
Default
No
Off
Range
Description
No, Yes
Off, On
Active IP address
Active Subnet mask
Active Gateway
Given IP address (it will become the active)
Given Subnet mask
Given Gateway
Primary DNS
Secondary DNS
Controller Name
Controller MAC Address
Check with IT Department on how to set these properties in order to connect the Microtech III to
the local network.
4.2.12 Daikin on Site
This menu allows to the user to enable the communication with Daikin cloud DoS (Daikin on Site) .
This option requires that the controller has access to internet. Please contact your service
organization for more details.
Setpoint/Sub-Menu
Comm Start=
Comm State=
Cntrlr ID=
Activation Key=
Default
Off
-
-
Range
Off, Start
IPErr
Init
InitReg
Reg
RegErr
Descr
Connected
-
Description
Command to enable the communication
Communication state.
The communication is established only if this parameter displays Connected
Controller ID. This parameter is helpful to identify the specific controller in DoS
Activation Key
4.2.13 Menu Password
It is possible to keep the User level always active to avoid to enter the User password. To do this
the Password Disable setpoint shall be set to On.
Pwd Disable=
Off
Off, On
4.3 View/Set Circuit
In this section it is possible to select between the available circuits and access data available for
the circuit selected.
Setpoint/Sub-Menu
Default
Range
Description
Operation Manual
30
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller


Circuit #1
Circuit #2
Menu for Circuit #1
Menu for Circuit #2
The submenus accessed for each circuit are identical but the content of each of them reflects the
status of the corresponding circuit. In the following the submenus will be explained only once. If
only one circuit is available the item Circuit #2 in the above table will be hidden and not accessible.
Each of the above links will jump to the following submenu:
Setpoint/Sub-Menu
Data
Compressor
Condenser
EXV
Economizer
Settings
Default






Description
Thermodynamic data
Status of the compressor and electrical data
Status of the condenser fan regulation
Status of the expansion valve regulation
Status of the economizer
Settings
In any of the above submenus each item shows a value and a link to another page. In that page
the same data will be represented for both circuits as a reference as shown in the below example.
Setpoint/Sub-Menu
Comp 1 Run Hours
Circuit #1=
Circuit #2=
Default
Range
0h
0h
Description
Indication of the data represented
Data related to Circuit #1
Data related to Circuit #2
4.3.1 Data
In this page all relevant thermodynamic data are displayed.
Setpoint/Sub-Menu
Circuit Status=
Off:
VFD Heating
Capacity=
Evap Pressure=
Cond Pressure=
Suction Temp=
Discharge Temp=
Suction SH=
Discharge SH=
Oil Pressure=
Oil Pr Diff=
EXV Position=
Econ Sv Output=
Liq Inj=
Variable VR St=
Evap LWT=
Default
0.0%
220.0kPa
1000.0kPa
5.0°c
45.0°C
5.0°C
23.0°C
1000.0kPa
0.0kPa
50%
Off
Off
Off(VR2)
7.0°C
Range
Description
Status of the circuit
Off:
Ready
Off:
Stage Up Delay
Off:
Cycle Timer
Off:
BAS Disable
Off:
Keypad Disable
Off:
Circuit Switch
Off:
Oil Heating
Off:
Alarm
Off:
Test Mode
EXV
Preopen
Run:
Pumpdown
Run:
Normal
Run:
Disch SH Low
Run:
Evap Press Low
Run:
Cond Press High
Run:
High LWT Limit
Run:
High VFD Amps
Run:
High VFD Temp
Off:
Max Comp Starts
Off:
VFD Heating
Off:
Maintenance
Circuit capacity
Evaporating Pressure
Condensing Pressure
Suction Temperature
Discharge Temperature
Suction Superheat
Discharge Superheat
Oil Pressure
Oil Pressure differential
Expansion valve position
Economizer status
Liquid Injection status
VR2 or VR3 slide position status
Evaporator LWT
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
31
OPERATION
MANUAL
Air cooled inverter water chiller
Evap EWT=
12.0°C
Evaporator EWT
4.3.2 Compressor
This page resumes all the relevant information about compressor. In this page a manual
adjustment of the compressor capacity will be possible.
Setpoint/Sub-Menu
Oil Heating=
VFD Heating
Start=
Stop=
Run Hours=
No. Of Starts=
Cycle Time Rem=
Clear Cycle Time
Capacity=
Act Speed=
Current=
Percent RLA=
Power Input=
DC Voltage
Cap Control=
Manual Cap=
VFD Temp=
Vfd Valve Life=
Vfd Capct Life=
Start VFD Spd=
Max VFD Spd=
Default
Enforce
Enforce
0h
0
0s
Off
100%
5400rmp
200.0A
85%
0kW
0V
Auto
0.0%
0°C
100%
100%
1800rpm
5400rpm
Range
Enforce, Ignore
Enforce, Ignore
Off,On
Description
Setting to bypass oil heating control
Setting to bypass VFD control
Date and time of the last start
Date and time of the last stop
Running hours of compressor
Number of compressor starts
Remaining cycle time left
Cycle time clear command
Compressor capacity
Compressor speed (depends on model)
Inverter current
Percentage over the Full Load current
Power Input
DC-Link Voltage
Auto, Manual
Manual capacity percentage
VFD Temperature
Inverter cooling SV remaining cycles
Inverter capacitors remaining life
Compressor start speed
Compressor maximum speed
4.3.3 Condenser
This page resumes all the relevant data and settings to adjust the condenser pressure control to fit
the specific requirements for the operating conditions.
Setpoint/Sub-Menu
# Fans Running=
# Of Fans=
Stg Up Error=
Stg Dn Error=
Cond Sat Temp=
Cond Target=
VFD Target=
VFD Speed=
Fan VFD Enable=
Stg On Db 0=
Stg On Db 1=
Stg On Db 2=
Stg On Db 3=
Stg On Db 4=
Stg On Db 5=
Stg Off Db 2=
Stg Off Db 3=
Stg Off Db 4=
Stg Off Db 5=
Stg Off Db 6=
VFD Max Speed=
VFD Min Speed=
Default
0
6
0
0
0
30.0°C
30.0°C
0.0%
Enable
4.0°C
5.0°C
5.5°C
6.0°C
6.5°C
6.5°C
10.0°C
8.0°C
5.5°C
4.0°C
4.0°C
700rpm
175rpm
Range
Description
Number of fans currently running
Total number of fans
Error to stage up one fan
Error to stage down one fan
Saturated condensing temperature
Saturated condenser temperature target
Target for the VFD (only for Vfd and Speedtroll)
Current VFD Speed
Fan speed regulation enabled
Dead band for fan stage up #1
Dead band for fan stage up #2
Dead band for fan stage up #3
Dead band for fan stage up #4
Dead band for fan stage up #5
Dead band for fan stage up #6
Dead band for fan stage down #2*
Dead band for fan stage down #3
Dead band for fan stage down #4
Dead band for fan stage down #5
Dead band for fan stage down #6
VFD maximum speed
VFD minimum speed
* last fan running stage down uses a fixed limit not accessible from the HMI.
Fan settings are set to have a good and stable control of the condenser saturated temperature in almost all
operating conditions.
Improper modification of the default settings could affect performances and generate circuit alarms. This
action must be performed only by trained persons.
Operation Manual
32
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
4.3.4 EXV
This page resumes all the relevant information about the status of the EXV logic.
Setpoint/Sub-Menu
EXV State=
Suction SH=
Superht Target=
Evap Pressure=
EXV Position=
Default
Closed
6.0°C
6.0°C
220kPa
50.0%
Range
Closed, Pressure, Superheat
Description
EXV State
Suction Superheat
Suction Superheat setpoint
Evaporating Pressure
Expansion valve opening
4.3.5 Economizer
This page resumes all the relevant information about the data and the status of the economizer
Setpoint/Sub-Menu
Economizer=
Econ State=
Econ EXV Pos=
Econ SH=
Econ SH Tar=
Min EcoSH Tar=
Econ Press=
Econ Sat Temp=
Econ Temp=
Econ En Cap=
PR Limit
Default
With
Regulation
0%
6.0°C
6.0°C
6.0°C
500kPa
24°C
30°C
1200rpm
Auto
Fix PR Limit=
Auto PR Limit=
Pressure Ratio=
DSH Limit=
DSH=
3.3
3.0
-
Range
Without, With
Off,Preopen, SSH, Liq Inj
Auto, Fixed
1.5…5.0
Description
Setting to enable or disable the Economizer
Economizer State
Economizer EXV opening
Economizer Superheat
Actual calculated Economizer superheat target
Minimum Economizer superheat target
Economizer Pressure
Economizer Saturated Temperature
Economizer Temperature
Minimum compressor speed to enable Economizer
Setpoint to select if the Pressure Ratio limit to enable the
economizer is fixed or automatically calculated
Fixed pressure ratio limit to enable the economizer
Calculated pressure ratio limit to enable the economizer
Actual pressure ratio
Actual calculated DSH limit to enable the economizer
Actual discharge superheat
4.3.6 Settings
This page resumes the settings of the circuit.
Setpoint/Sub-Menu
Pumpdn Press=
Pumpdn Time=
Service Pumpdn=
Liq Inject Act=
Var VR Act PR=
Default
100kPa
120s
Off
90°C
3.8
Range
70…280kPa
0…180s
Off,On
80…100°C
1.5…5
Description
Pumpdown pressure limit
Pumpdown timeout limit
Activation of the function service pumpdown
Discharge Temperature limit to enable the liquid injection
Pressure Ratio threshold to activate VR3 slide position
4.4 Temperature Setpoint
This page resumes all chiller water temperature setpoints (limits and active setpoint will depend on
the operating mode selected).
Setpoint/Sub-Menu
Cool LWT 1=
Default
7.0°C
Cool LWT 2=
7.0°C
Ice LWT=
Max LWT=
Min LWT=
HR EWT Stp=
HR EWT Dif=
-4.0°C
15.0°C
-8.0°C
40.0°C
2.0°C
Range
4.0…15.0°C (cool mode)
-8.0…15.0°C (cool w/ glycol mode)
4.0…15.0°C (cool mode)
-8.0…15.0°C (cool w/ glycol mode)
-8.0…4.0°C
10.0…20.0°C
-15.0…-8.0°C
30.0…50.0°C
1.0…10.0°C
Description
Primary cooling setpoint
Secondary cooling setpoint (see 3.6.3)
Ice setpoint (ice banking with on/off mode)
High limit for Cool LWT1 and Cool LWT2
Low limit for Cool LWT1 and Cool LWT2
Heat Recovery Entering Water Setpoint
Heat Recovery Water Temperature differential
4.5 Temperatures
This page resumes all the relevant water temperatures
Setpoint/Sub-Menu
Default
Range
Description
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
33
OPERATION
MANUAL
Air cooled inverter water chiller
Evap LWT=
Evap EWT=
Evap Delta T=
Pulldn Rate=
Outside Air=
Switch Box T=
Common LWT=
HR LWT=
HR EWT=
-273.1°C
-273.1°C
-273.1°C
0.0°C/min
-273.1°C
-273.1°C
-273.1°C
-273.1°C
-273.1°C
-
Controlled water temperature
Return water temperature
Delta T across Evaporator
Rate of decrease of the controlled temperature
Outside air temperature
Switch Box temperature
Master Slave Common supply water temperature
Heat Recovery Leaving Water Temperature
Heat Recovery Entering Water Temperature
4.6 Unit Capacity
This page displays the actual unit and circuit capacity
Setpoint/Sub-Menu
Unit=
Circuit #1=
Circuit #2=
Default
Range
-
-
Description
Actual unit capacity
Actual circuit 1 capacity
Actual circuit 2 capacity
4.7 Unit Mode
Menu to select the available unit modes
Setpoint/Sub-Menu
Available Modes=
Default
Cool
Range
Cool,
Cool w/ Glycol,
Cool/Ice w/ Glycol,
Ice w/ Glycol,
Test
Description
Available operating modes
4.8 Unit Enable
This page allows to enable or disable unit and circuits. For the unit it also possible enable the
operation with time scheduler, while for circuit it is possible to enable the test mode.
Setpoint/Sub-Menu
Unit
Circuit #1
Circuit #2
Default
Enable
Enable
Enable
Range
Enable, Disable, Scheduler
Enable, Disable, Test
Enable, Disable, Test
Description
Unit enable command
Circuit #1 enable command
Circuit #2 enable command
4.9 Timers
This page indicates the remaining cycle timers for each circuit and the remaining staging timers.
When the cycle timers are active any new start of a compressor is inhibited.
Setpoint/Sub-Menu
C1 Cycle Tm Left=
C2 Cycle Tm Left=
C1 Cycle Tmr Clr=
C2 Cycle Tmr Clr=
Stg Up Dly Rem=
Stg Dn Dly Rem=
Clr Stg Delays=
Ice Cycle Rem=
Clr Ice Dly
Default
0s
0s
Off
Off
0s
0s
Off
0min
Off
Range
Off, On
Off, On
Off, On
Off, On
Description
Circuit 1 cycle timer
Circuit 2 cycle timer
Clear circuit 1 cycle timer
Clear circuit 2 cycle timer
Remaining delay to next compressor start
Remaining delay to next compressor stop
Clear remaining delays to next compressor start/stop
Remaining Ice cycle delay
Clear remaining delay for Ice mode
4.10 Alarms
This link jumps to the same page accessible with the Bell button. Each of the items represents a
link to a page with different information. The information shown depends on the abnormal
operating condition that caused the activation of unit, circuit or compressor safeties. A detailed
Operation Manual
34
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
description of the alarms and how to handle will be discussed in the section Troubleshooting this
chiller.
Setpoint/Sub-Menu
Alarm Active
Alarm Log
Event Log
Alarm Snapshot
Default




Description
List of the active alarms
History of all the alarms and acknowledges
List of the events
List of alarm snapshots with all the relevant data recorded at time the alarm occurred.
4.11 Commission Unit
Setpoint/Sub-Menu
Configuration
Alarms Limits
Calibrate Sensors
Manual Control
Scheduled Maintenance
Default





-



-
Range
Description
Submenus for Unit and Circuit configuration
Submenu for alarm limits definition
Submenus for Unit and Circuit sensor calibration
Submenus for Unit and Circuit manual control
Submenu for scheduled maintenance
Range
Description
Submenu for Unit configuration
Submenu for Circuit 1 configuration
Submenu for Circuit 2 configuration
4.11.1 Configuration
Setpoint/Sub-Menu
Unit
Circuit #1
Circuit #2
Default
4.11.1.1 Unit Configuration
This page resumes all the specific settings for this unit like number of circuits, compressors type,
fan regulation strategy, etc. Part of these settings cannot be adjusted and are supposed to be set
during the manufacturing or commissioning of this unit. See chapter “Commission Unit” for more
details.
Setpoint/SubMenu
Apply Changes=
Unit Type
Number Of Ckts=
Comp Type=
Comp
Motor
Type=
Cond Cntrl=
Fan Type=
Pump Type=
Load PD Sns=
Power Supply=
Energy Mtr=
Leak Detector=
Comm
Module
1=
Comm
Module
2=
Comm
Module
3=
Fan Alarm
Switch Box Tem=
Rapid Restart=
Alm Out Type=
Loc Net Switch=
M/S Address=
Default
No
EWAD TZ
B
2
None
AC
Step
AC700
On-Off
None
400V/5060Hz
None
None
None
None
None
No
No
Off
Solid
No
None
Range
No, Yes
EWAD TZ, EWAD TZ B
1,2
Not Set; 3120; 3122; F3AL; F3AS
AC, DC
Step, Vfd, SpdTrl
AC900,
AC900L,
AC700,
EC900,
EC900L, EC700, EC1000L
On-Off, Fixed Speed, VPF
0-10V, 4-20mA,BMS,None
400V/50-60Hz
415V/50Hz
440V/60Hz
460V/60Hz
380V/50-60Hz
None, Nemo D4-L; Nemo D4-Le
None, Digital, Analog
Modbus, Bacnet IP, Bacnet MSTP, Lon,
AWM
Modbus, Bacnet IP, Bacnet MSTP, Lon,
AWM
Modbus, Bacnet IP, Bacnet MSTP, Lon,
AWM
No, Yes
No, Yes
Off,On
Solid, Blinking
No,Yes
None; Master; Slave 1; Slave 2; Slave 3
Description
Type yes after changes
Set compressor model
Define the motor type
AC for Brushed motor
DC for Brushless motor
Set condenser fan control
Fan type
Set Pump Control
Set Load Pressure Drop Sensor Type
Define the power supply
Set Energy Meter Type
Set the leak detector type
Enable of the function Fan Alarm
Enable of the Switch Box Temperature
Enable of the Rapid Restart
Define the behavior of the alarm output
Enable of the local network switch
Select the unit address in the Master Slave system.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
35
OPERATION
MANUAL
Air cooled inverter water chiller
M/S Num Of
Units=
M/S Sns Type
Display Units=
Language
2
NTC10K
Metric
English
Select none if the unit works as standalone
Select the number of units in the Master Slave system
2,3,4
None,NTC10K,PT1000
Select the sensor type used to measure the Master
Slave common leaving water temperature
Metric, English
-
Check for availability of your own language
Modification to any of these values will require to be acknowledged to the controller by setting
“Apply Changes = Yes”. This will cause a controller reboot! This action can only be performed with
the Q0 switch on the unit switchbox set to 0.
4.11.1.2 Circuit Configuration
This page allows to adjust the number of fans for each circuit.
Setpoint/Sub-Menu
Apply Changes=
Comp Freq
Default
Range
No
-
C1 # Of Fans=
Heat Recovery=
6
Disable
Compressor 3120:
55 Hz; 60 Hz; 65 Hz;
70 Hz
Compressor 3122:
60 Hz; 65 Hz; 70 Hz;
75 Hz; 80 Hz; 85 Hz;
90 Hz
Compressor F3AL:
60 Hz; 65 Hz; 70 Hz;
75Hz; 80 Hz; 85 Hz
Compressor F3AS:
60 Hz; 67,5 Hz; 70 Hz;
75 Hz
Description
No, Yes
Maximum compressor frequency
Number of fans available.
Disable, Enable
4.11.2 Alarm Limits
This page contains all alarm limits, including low pressure alarm prevention thresholds. In order to
ensure proper operation they have to be set manually according to the specific application.
Setpoint/Sub-Menu
Low Press Hold=
Low Press Unld=
Hi Oil Pr Dly=
Hi Oil Pr Diff=
Hi Disch Temp=
Hi Cond Pr Dly=
Lo Pr Ratio Dly=
OAT Lockout=
Strt Time Lim=
Evap Water Frz=
Evap Flw Proof=
Evp Rec Timeout=
Low DSH Limit=
Gas Conc Lim=
HP Sw Test C#1
HP Sw Test C#2
Ext Fault Cfg=
Default
180.0kPa
160.0kPa
30s
250kPa
110.0°C
5s
90s
4.0°C
60s
2.2°C
15s
3min
12.0°C
200ppm
Off
Off
Event
Range
Event, Alarm
Description
Low pressure safety limit to stop capacity increase
Low pressure alarm prevention
Delay for the High oil pressure difference alarm
Pressure drop for a clogged filter
Maximum discharge temperature limit
Delay on the High pressure alarm from transducer
Delay on the low pressure ratio alarm
Air temperature operational limit
Time limit for the low ambient start
Freeze protection limit
Flow proof delay
Recirculating timeout before the alarm is raised
Minimum acceptable discharge superheat
Maximum gas concentration limit
On, Off. Enables to check operation of the high pressure switch on #1.
On, Off. Enables to check operation of the high pressure switch on #2.
Definition of the unit behavior after switching of external alarm contact
The HP Sw Test shuts off all fans while compressor is running in order to raise condenser pressure
until tripping of the high pressure switches. Beware that in case of high pressure switch failure the
safety valves will trip and hot refrigerant will be ejected at high pressure!
Once tripped, the software will get back to normal operation. However, the alarm will not be reset
until the high pressure switches are manually reset through the button included in the switch.
Operation Manual
36
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
4.11.3 Calibrate Sensors
Setpoint/Sub-Menu
Unit
Circuit #1
Circuit #2
Default
Range



-
Description
Submenu for Unit calibrate sensor
Submenu for Circuit 1 calibrate sensor
Submenu for Circuit 2 calibrate sensor
4.11.3.1 Unit Calibrate Sensors
This page allows a proper calibration of the unit sensors
Setpoint/Sub-Menu
Evap LWT=
Evp LWT Offset=
Evap EWT=
Evp EWT Offset=
Outside Air=
OAT Offset=
HR Ewt=
HR Ewt Offset=
HR Lwt=
HR Ewt Offset=
Switch Box T
HR Ewt Offset=
Common LWT
Comm LWT Offset=
Default
7.0°C
0.0°C
12.0°C
0.0°C
35.0°C
0.0°C
40.0°C
0.0°C
45.0°C
0.0°C
40.0°C
0.0°C
8°C
0.0°C
Range
Description
Evaporator LWT current reading (includes the offset)
Evaporator LWT calibration
Evaporator EWT current reading (includes the offset)
Evaporator EWT calibration
Outside Air Temperature current reading (includes the offset)
Outside Air Temperature calibration
Heat Recovery EWT current reading (includes the offset)
Heat Recovery EWT calibration
Heat Recovery LWT current reading (includes the offset)
Heat Recovery LWT calibration
Switch Box Temperature current reading (includes the offset)
Switch Box Temperature calibration
Common LWT current reading Includes the offset
Common LWT calibration
4.11.3.2 Circuit Calibrate Sensors
This page allows to adjust the sensors and transducers readings.
Setpoint/Sub-Menu
Evap Pressure=
Evp Pr Offset=
Cond Pressure=
Cnd Pr Offset=
Oil Pressure=
Oil Pr Offset=
Suction Temp=
Suction Offset=
Discharge Temp=
Disch Offset=
Econ Pressure=
Eco Pr Offset=
Econ Temp=
Eco Tmp Offset=
Default
Range
0.0kPa
0.0kPa
0.0kPa
0.0°C
0.0°C
0.0kPa
0.0°C
Description
Evaporator Pressure current reading (includes the offset)
Evaporator Pressure offset
Condenser Pressure current reading (includes the offset)
Condenser Pressure offset
Oil Pressure current reading (includes the offset)
Oil Pressure offset
Suction Temperature current reading (includes the offset)
Suction Temperature offset
Discharge Temperature current reading (includes the offset)
Discharge Temperature offset
Economizer Pressure current reading (includes the offset)
Economizer Pressure offset
Economizer Temperature current reading (includes the offset)
Economizer Temperature offset
Calibrations of the Evaporator Pressure and Suction Temperature are mandatory for the
applications with negative water temperature setpoints. These calibrations have to be performed
with proper gauge and thermometer.
An improper calibration of the two instruments may generate limitation of the operations, alarms
and even damages to components.
4.11.4 Manual Control
This page contains links to other sub-pages where all the actuators can be tested, the raw values
of the readings of each sensor or transducer can be checked, the status of all the digital inputs
verified and the status of all the digital output checked.
Setpoint/Sub-Menu
Unit
Circuit #1
Circuit #2
Default



Range
Description
Acutators and sensors for the common parts (Unit)
Acutators and sensors for Circuit #1
Acutators and sensors for Circuit #2
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
37
Air cooled inverter water chiller
OPERATION
MANUAL
4.11.4.1 Unit
This page contains all the test point, status of the digital inputs, status of the digital output and raw
value of the analog inputs associated to the Unit. To activate the test point it’s required to set the
Available Modes to Test (see section Errore. L'origine riferimento non è stata trovata.) and this
requires the Unit to be disabled.
Setpoint/Sub-Menu
Test Unit Alarm Out=
Test C1 Alarm Out=
Test C2 Alarm Out=
Test Evap Pump 1=
Test Evap Pump 2=
Test HR Pmp=
Test Bypass Vlv=
Test Pmp Spd=
Input/Output Values
Unit Sw Inpt=
Estop Inpt=
PVM Inpt=
Default
Off
Off
Off
Off
Off
Off
Off
0%
Evap Flow Inpt=
Ext Alm Inpt=
CurrLm En Inpt=
Dbl Spt Inpt=
Dbl Speed Inpt=
RR Unlock Inpt=
HR Switch Inpt=
Loc Bas Inpt=
Battery Inpt=
Evp LWT Res=
Evp EWT Res=
OA Temp Res=
HR Ewt Res=
HR Lwt Res=
SwBox Tmp Res=
Common LWT Res=
LWT Reset Curr=
Dem Lim Curr=
Flex Curr Lim=
Load PD Raw=
Evap PD Volt=
Unit Alm Outpt=
C1 Alm Outpt=
C2 Alm Outpt=
Evp Pmp1 Outpt=
Evp Pmp2 Outpt=
HR Pmp Outpt=
Bypass Vlv Outpt=
Pump Speed Outpt=
Off
Off
Off
Off
Off
Off
Off
Off
Off
0Ohm
0Ohm
0Ohm
0Ohm
0Ohm
0Ohm
0Ohm
0mA
0mA
0mA
0V-0mA
0V
Off
Off
Off
Off
Off
Off
0V
0V
Off
Off
Off
Range
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
0-100%
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
340-300kOhm
340-300kOhm
340-300kOhm
340-300kOhm
340-300kOhm
340-300kOhm
340-300kOhm
3-21mA
3-21mA
3-21mA
0-10V/4-20mA
0-10V
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
0-10V
0-10V
Description
Test of the General Alarm relay output
Test of the Circuit #1 Alarm relay output
Test of the Circuit #2 Alarm relay output
Test of the Evaporator Pump #1
Test of the Evaporator Pump #2
Test of the Heat Recovery Pump
Test of the Bypass Valve
Test of the Evaporator Pump Speed
Status of the Unit Switch
Status of the Emergency Stop button
Status of Phase Voltage monitor, Under-Over voltage protection or Ground
Fault protection (check option installed)
Status of the Evaporator Flow switch
Status of the External Alarm input
Status of the Current Limit enable switch (optional)
Status of the Double Setpoint switch
Status of the pump Double Speed Switch
Status of the Rapid Restart enable switch (optional)
Status of the Heat Recovery Switch input
Status of the Local Network Switch input
Status of the Battery Mode input
Resistance of the Evaporator LWT sensor
Resistance of the Evaporator EWT sensor
Resistance of the OAT sensor
Resistance of the Heat Recovery EWT sensor
Resistance of the Heat Recovery LWT sensor
Resistance of the Switch Box Temperature sensor
Resistance of the Common LWT sensor
Current input for the Setpoint Reset
Current input for the Demand Limit
Current input for the Flex Current Limit
Voltage/Current input for the Load Pressure Drop sensor
Voltage Input for the Evaporator Pressure Drop sensor
Status of the General Alarm relay
Status of the Circuit #1 Alarm relay
Status of the Circuit #2 Alarm relay
Status of the Evaporator Pump #1 relay
Status of the Evaporator Pump #2 relay
Status of the Heat Recovery Pump relay
Status of the Bypass Valve
Voltage signal for the pump VFD
4.11.4.2 Circuit #1 (Circuit #2 if present)
This page contains all the test point, status of the digital inputs, status of the digital output and raw
value of the analog inputs associated to the Circuit #1 (or Circuit #2 if present and depending on
the link followed). To activate the test point it’s required to set the Available Modes to Test (see
section Errore. L'origine riferimento non è stata trovata.) and this requires the Unit to be
disabled.
Setpoint/Sub-Menu
Test Liq Inj=
Test Economizr=
Test Fan 1=
Default
Off
Off
Off
Range
Off/On
Off/On
Off/On
Description
Test of the Liquid Injection SV
Test of the Economizer SV
Test of the Fan Output #1
Operation Manual
38
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
Test Fan 2=
Test Fan 3=
Test Fan 4=
Test Fan 5=
Test Fan 6=
Test Var VR=
Test VR Load=
Test VR Unld=
Test VFD Speed=
Test EXV Pos=
Test EcoEXV Pos=
Input/Output Values
Cir Sw Inpt=
Mhp Sw Inpt=
Gas Leak Inpt=
Fan Alm Inpt=
Evap Pr Inpt=
Cond Pr Inpt=
Oil Pr Inpt=
Gas Leak Inpt=
Econ Pr Inpt=
Econ Temp Res=
Suct Temp Res=
Disc Temp Res=
Strtr Outpt=
Liq Inj Outpt=
Econ Sv Outpt=
Fan 1 Outpt=
Fan 2 Outpt=
Fan 3 Outpt=
Fan 4 Outpt=
Fan Vfd Outpt=
Variable VR St
Off
Off
Off
Off
Off
Off
Off
Off
0%
0%
0%
Off
Off
Off
Off
0.0V
0.0V
0.0V
0.0V
0.0V
0.0Ohm
0.0Ohm
0.0Ohm
Off
Off
Off
Off
Off
Off
Off
0.0V
Off(VR2)
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
0-100%
0-100%
0-100%
Test of the Fan Output #2
Test of the Fan Output #3
Test of the Fan Output #4
Test of the Fan Output #5
Test of the Fan Output #6
Test of VR3 slide position
Test of VR Load relay (VR3)
Test of VR Unload relay (VR2)
Test of the VFD for fans
Test of the Expansion Valve movements
Test Of the Economizer Expansion Valve movements
Off/On
Off/On
Off/On
Off/On
0.4-4.6V
0.4-4.6V
0.4-4.6V
0.0-10.0V
0.4-4.6V
340-300kOhm
340-300kOhm
340-300kOhm
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
Off/On
0-10.0V
Off(VR2)/On(VR3)
Status of the Circuit Enable switch
Status of the Mechanical High Pressure switch
Status of the Gas Leak switch
Status of the Fan Alarm Input
Input voltage for the Evaporator Pressure
Input voltage for the Condenser Pressure
Input voltage for the Oil Pressure
Input voltage for the Gas Leak sensor
Input voltage for the Economizer Pressure
Resistance of the Economizer Temp sensor
Resistance of the Suction Temp sensor
Resistance of the Discharge Temp sensor
Status of the Inverter start command
Status of the Liquid Line SV relay
Status of the Economizer SV relay
Status of the Fan Output #1
Status of the Fan Output #2
Status of the Fan Output #3
Status of the Fan Output #4
Output voltage to the fan VFD
Variable VR slide position (VR2, VR3)
OPERATION
MANUAL
4.11.5 Scheduled Maintenance
This page may contains the contact number of the Service organization taking care of this unit and
the next maintenance visit schedule.
Setpoint/Sub-Menu
Next Maint=
Support Reference=
Default
Jan 2015
999-999-999
Range
Description
Schedule date for next maintenance
Reference number or email of Service Org
4.11.6 Setup for communication modules
In order to properly setup the communication modules (Modbus, Bacnet IP, Bacnet MSTP and
LON), please refer to the related documentation available from the factory.
4.12 About this Chiller
This page resumes all the information needed to identify the unit and the current software version
installed. These information may be required in case of alarms or unit failure
Setpoint/Sub-Menu
Model
Unit S/N=
OV14-00001
BSP Ver=
App Ver=
Default
Range
Description
Unit model and code name
Unit serial number
Firmware version
Software version
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
39
OPERATION
MANUAL
Air cooled inverter water chiller
5 Working with this unit
This section contains a guide on how to deal with the everyday usage of the unit. Next sections
describe how to perform routine tasks on the unit, such as:





Unit Setup
Unit/Circuit start-up
Alarm handling
BMS Control
Battery replacement
5.1 Unit Setup
Before starting up the unit, some basic settings need to be set by the customer according to the
application.
Control Source
Available Modes=
Temperature Settings
Alarm Settings
Evap Pump Settings
Power Conservation
Date/Time
Scheduler
Local
Cool






See chapter 4.2.2
See chapter 4.7
See chapter 5.1.3
See chapter 5.1.4
See chapter 5.1.5
See chapter 4.2.94.2.9
See chapter 4.2.7
See chapter 4.2.8
5.1.1 Control Source
This function allows to select which source should be used for unit control. The following sources
are available:
Local
Network
Unit is enabled by local switches placed into the switchbox, chiller mode (cool, cool w/glycol, ice), LWT setpoint and capacity
limit are determined by local settings in the HMI.
Unit is enable by a remote switch, chiller mode, LWT setpoint and capacity limit are determined by an external BMS. This
function requires:

Remote enable connection to a BMS (unit on/off switch must be in remote)

Communication module and its connection to a BMS.
More parameters about network control can be found in 4.2.2.
5.1.2 Available Mode Setting
The following operating modes can be selected through the Available modes menu 4.7:
Cool
Cool
w/Glycol
Ice
Cool/Ice
w/Glycol
Test
Set if chilled water temperature up to 4°C is required. No glycol is generally needed in the water circuit, unless ambient
temperature may reach low values.
Set if chilled water temperature below 4°C is required. This operation requires proper glycol/water mixture in the
evaporator water circuit.
Set if ice storage is required. The application requires the compressors to operate at full load until the ice bank is
completed, and then to stop for at least 12 hours. In this mode the compressor(s) will not operate at part load, but will
work only in on/off mode.
Set in case a dual cool/ice mode is required. This setting implies an operation with double setpoint which is activated
through a customer supplied switch, according to the following logic:

Switch OFF: The chiller will work in cooling mode with the Cool LWT 1 being as the Active Setpoint.

Switch ON: The chiller will work in ice mode with the Ice LWT as the Active Setpoint.
Enables the Manual Control of the unit. The manual test feature helps in debugging and checking the operational status
of sensors and acutators. This feature is accessible only with the maintenance password in the main menu. To activate
the test feature is required to disable the Unit from the Q0 switch and change the available mode to Test (see
section5.2.1).
Operation Manual
40
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
5.1.3 Temperature Settings
Purpose of the unit is to keep the evaporator leaving water temperature as close as possible to a
pre-set value, called Active Setpoint. The Active Setpoint is calculated by the unit controller based
on the following parameters:






Available Modes (Cool, Cool w/Glycol, Ice)
Double setpoint input
Scheduler state
Cool/Ice LWT Setpoint
Setpoint Reset
Quiet Mode
Operation mode and LWT setpoint can also be set via network if the appropriate control source
has been selected.
5.1.3.1 LWT Setpoint Setting
Setpoint range is limited according to the selected operating mode. The controller includes two
setpoint in cooling mode (either standard cool or cool w/glycol) and one setpoint in ice mode, which
are activated according to Operating mode, Dual Setpoint or Scheduler selection.
If the Time Scheduler is enabled the Dual Setpoint input state will be ignored by the controller.
The table below lists the LWT Setpoint being activated according to the operation mode, the
double setpoint switch status and the scheduler state. The table also reports the defaults and the
range allowed for each setpoint.
Operating Mode
Cool
Cool w/ Glycol
Cool/Ice w/ Glycol
Ice w/ Glycol
Double Setpoint Input
OFF
ON
OFF
ON
OFF (cooling mode)
ON (ice mode)
N/A
Scheduler
Off, On Setpoint 1
On Setpoint 2
Off, On Setpoint 1
On Setpoint 2
Off, On Setpoint 1
(cooling mode)
On Setpoint 2 (ice
mode)
N/A
LWT Setpoint
Cool LWT 1
Cool LWT 2
Cool LWT 1
Cool LWT 2
Cool LWT 1
Default
7.0°C
7.0°C
7.0°C
7.0°C
-4.0°C
Range
4.0°C  15.0°C
4.0°C  15.0°C
-8.0°C  15.0°C
-8.0°C  15.0°C
-8.0°C  4.0°C
Ice LWT
-4.0°C
-8.0°C  4.0°C
Ice LWT
-4.0°C
-8.0°C  4.0°C
The LWT setpoint can be overridden in case the setpoint reset (for details see chapter 5.1.6.3) or
the quiet mode are activated (see chapter 5.1.7.2).
Dual Setpoint, Setpoint Reset and Quiet Mode are not operational in Ice Mode.
5.1.3.2 Thermostat Control Settings
Thermostat control settings, see section 4.2.1, allow to set up the response to temperature
variations and the precision of the thermostat control. Default settings are valid for most
applications, however site specific conditions may require adjustments in order to have a smooth
and precise temperature control or a quicker response of the unit.
The control will start the first circuit if the controlled temperature is higher than the active setpoint
(AS) of at least a Start Up DT (SU) value. Once circuit capacity exceeds the Hi Ld Stg Up %
another circuit is switched on.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
41
Air cooled inverter water chiller
OPERATION
MANUAL
When leaving water temperature is within the deadband (DB) error from the active setpoint, unit
capacity will not be changed.
If the leaving water temperature decreases below the setpoint, unit capacity is adjusted to keep it
stable. Further decrease of the controlled temperature to a Shut Down DT offset (SD) can cause
circuit shutdown and in the Shutdown area the whole unit is switched off. In particular, a
compressor will be shut down if it is required to unload below the Lt Ld Stg Dn % capacity.
Loading and unloading speeds are calculated by a proprietary PID algorithm. However, maximum
the rate of water temperature decrease can be limited through the parameter Max Pulldn.
Circuits are always started and stopped to guarantee the balancing of running hours and number or starts
in multiple circuits units. This strategy optimizes the lifetime of compressors, inverters, capacitors and all the
others circuit components.
Thermostat
Control
AS+SU
OFF
Evap Leaving Water Temperature
Thermostat Control ON
Capacity
load up
Thermostat Control OFF
Capacity
Unload
AS
AS-SD
5.1.4 Alarm Settings
Factory defaults are set for standard cooling mode, therefore they may not be properly tuned when
working at different conditions. Depending on the application, the following alarm limits need to be
adjusted:



Low Press Hold
Low Press Unload
Evap Water Frz
Low Press Hold
Low Press Unload
Evap Water Frz
Set the minimum refrigerant pressure of the unit. It is generally recommended to set to a value whose saturated
temperature is 8 to 10°C below the minimum active setpoint. This will allow a safe operation and a proper control
of compressor suction superheat.
Set lower than the hold threshold enough to allow a suction pressure recovery from fast transients without
unloading the compressor. A 20 kPa differential is generally appropriate for most applications.
Stops the unit in case the leaving temperature falls below a given threshold. To allow a safe operation of the
chiller, this setting must be adequate to the minimum temperature allowed by the mixture water/glycol present in
the evaporator water circuit.
Operation Manual
42
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
5.1.5 Evap Pump Settings
This menu allows to set:
Pump Type
Evap Pump Ctrl
Set pump type between on/off, fixed speed and variable primary flow
Set number of active pumps and priority
5.1.5.1 Pump Type
Pump type can be configured through the unit configuration menu 4.11.1.1:
On/Off
Set to this when pump operates with no inverter or with a customer supplied speed control signal. Controller output is only
a start/stop command.
Set to this when pump is with inverter but operates at a fixed speed. Controller output is a start/stop command and a
locally set speed reference 0-10V signal.
Set to this on inverter driven pumps where an automatic control of a variable primary flow is required.
Fixed
Speed
VPF
5.1.5.2 Pumps
The following options are available to control the pump(s):
#1 Only
#2 Only
Auto
#1 Primary
#2 Primary
5.1.6
Set to this in case of single pump or twin pump with only #1 operational (f.e. in case of maintenance on #2)
Set to this in case of twin pump with only #2 operational (f.e. in case of maintenance on #1)
Set for automatic pump start management. At each chiller start, the pump with the least number of hours will be activated.
Set to this in case of twin pump with #1 running and #2 as a backup
Set to this in case of twin pump with #2 running and #1 as a backup
Power Conservation
5.1.6.1 Demand Limit
Demand limit function allows the unit to be limited to a specified maximum load. Capacity limit level
is defined with an external 4-20 mA signal and linear relationship. 4 mA indicate maximum capacity
available whereas 20 mA indicates minimum capacity available.
With demand limit function is not possible shutdown the unit but only unload it until minimum
admissible capacity.
Capacity Limit [%]
Maximum
Capacity
Minimum
Capacity
4
20
Demand Limit [mA]
Demand limit related setpoints available through this menu are:
Unit Capacity
Demand Limit En
Demand Limit
Displays current unit capacity
Enables demand limit
Displays active demand limit
5.1.6.2 Current Limit (Optional)
Current limit function allows to control unit power consumption taking current drawn below a
specific limit. Starting from the Current Limit Setpoint defined through the HMI or BAS
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
43
OPERATION
MANUAL
Air cooled inverter water chiller
communication, user can decrease the real limit using an external 4-20mA signal as indicate in the
graph below. With 20 mA real current limit is set to Current Limit Setpoint, whereas with 4 mA
signal the unit is unloaded until minimum capacity.
Current Limit [A]
Current Limit Setpoint
4
20
Flexible Current Limit [mA]
5.1.6.3 Setpoint Reset
The setpoint reset function overrides the chilled water temperature selected through the interface,
when certain circumstances occur. This feature helps in reducing energy consumption optimizing
comfort as well. Three different control strategies can be selected:



Setpoint Reset by Outside Air Temperature (OAT)
Setpoint Reset by an external signal (4-20mA)
Setpoint Reset by Evaporator ΔT (Return)
The following setpoints are available through this menu:
Setpoint Reset
Max Reset
Start Reset DT
Max Reset OAT
Strt Reset OAT
Set the Setpoint Reset mode (None, 4-20 mA, Return, OAT)
Max Setpoint Reset (valid for all active modes)
Used on Setpoint Reset by Evaporator DT
See Setpoint Reset by OAT Reset
See Setpoint Reset by OAT Reset
Setpoint Reset by OAT Reset
The active setpoint is calculated applying a correction which is a function of ambient temperature
(OAT). As temperature drops below the Start Reset OAT (SROAT), LWT setpoint is gradually
increased until OAT reaches the Max Reset OAT value (MROAT). Beyond this value, the LWT
setpoint is increased by the Max Reset (MR) value.
Operation Manual
44
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
A
S
LWT SP + MR
MR
LWT SP
MROA
T
Parameter
Max Reset (MR)
Max Reset OAT (MROAT)
Default
5.0°C
15.5°C
Range
Start Reset OAT(SROAT)
Active Setpoint (AS)
LWT Setpoint (LWT SP)
23.8°C
10.0°C 29.4°C
SROA
T
OAT
0.0°C  10.0°C
10.0°C 29.4°C
Cool/Ice LWT
Setpoint Reset by External 4-20 mA Signal
The active setpoint is calculated applying a correction based on an external 4-20mA signal. 4 mA
corresponds to 0°C correction, while 20 mA corresponds to a correction of the active setpoint as
set in Max Reset (MR).
AS
LWT SP + MR
MR
LWT SP
4mA
Parameter
Max Reset (MR)
Active Setpoint (AS)
LWT Setpoint (LWT SP)
Signal
Default
5.0°C
20mA
Signal
Range
0.0°C  10.0°C
Cool/Ice LWT
4-20mA External signal
Setpoint Reset by Evaporator Return Temperature
The active setpoint is calculated applying a correction that depends on the evaporator entering
(return) water temperature. As evaporator ΔT becomes lower than the SRΔT value, an offset to
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
45
OPERATION
MANUAL
Air cooled inverter water chiller
the LWT setpoint is increasingly applied, up to the MR value when the return temperature reaches
the chilled water temperature.
AS
LWT
MR
SP
+
MR
LWT SP
Evap T
0
Parameter
Max Reset (MR)
Start Reset DT (SRT)
Active Setpoint (AS)
LWT Target (LWT SP)
Default
5.0°C
5.0°C
SRT
Range
0.0°C  10.0°C
0.0°C  10.0°C
Cool/Ice LWT
The Return Reset may affect negatively the chiller operation when operated with variable flow. Avoid to use
this strategy in case of inverter water flow control.
5.1.6.4 Soft Load
Soft Loading is a configurable function used to ramp up the unit capacity over a given time period,
usually used to influence building electrical demand by gradually loading the unit. The setpoints
that control this function are:
Softload En
Softload Ramp
Starting Cap
5.1.7
Enables soft loading
Duration of the soft load ramp
Begin capacity limit. Unit will increase capacity from this value to 100% over the time specified by the Softload Ramp
setpoint.
Date/Time
5.1.7.1 Date,Time and UTC Settings
See 4.2.7.
5.1.7.2 Quiet Mode Scheduling
The Quiet Mode can be used to reduce chiller noise in certain hours of the day when noise
reduction is more important than cooling operation, like for example in night time. When Quiet
Mode is activated, the LWT setpoint is increased by the maximum setpoint reset (MR) described in
the chapter “Setpoint Reset”, thus forcing a capacity limitation to the unit without losing control on
chilled water temperature. Also, condenser temperature target is increased by a value set in “QM
Cond Offset”. In this way condenser fans are forced to reduce speed without losing control on
condensation. Quiet mode is timer enabled.
Operation Manual
46
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
CP SP + CO
CondPress
CP SP
LWT SP + MR
LWT SP
Evap T
0
QMS
Parameter
Quiet Mode
QM Start Hr (QMS)
QM Start Min
QM End Hr (QME)
QM End Min
QM Cond Offset (CO)

QME
Default
Disable
21h
0min
6h
0min
5°C
time
Range
Disable, Enable
0…24h
0...60min
0…24h
0…60min
0…10°C
The Quiet Mode may affect negatively chiller efficiency due to the increased condenser
setpoint.
5.1.8 Scheduler
Unit On/Off can be managed automatically through the function Time Scheduler enabled when the
parameter Unit Enable is set to Scheduler 4.8. For each day of the week user can define six time
slots and choose for each time slot one of following mode:
Off
On Setpoint 1
On Setpoint 2
Unit Off
Unit On and Cool LWT 1 is the active setpoint
Unit On and Cool LWT 2 is the active setpoint
5.2 Unit/Circuit Start-up
In this section, starting and stopping sequence of the unit will be described. All HMI status will be
briefly described to allow a better understanding of what is going on into the chiller control.
5.2.1 Prepare the unit to start
In order to let the unit start all the enable signals has to be changed to enable. The list of enabling
signals are:



Local/Remote Enable signals = Enable
Keypad Chiller Enable = Enable
BMS Chiller Enable Setpoint = Enable
These items will be now discussed. Each unit is equipped with a Local/Remote selector. It is
installed on the unit switchbox and can be positioned on three different positions: Local, Disable,
Remote as shown in the following picture:
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
47
Air cooled inverter water chiller
OPERATION
MANUAL
With the Q0 switch in this position the unit is disabled. Pump will
not start in normal operational condition. Compressor are kept
disabled independently from the status of the individual enable
switches.
With the Q0 switch in this position the unit is enabled. Pump will
start if all other enable signals are set to enable and at least one
compressor is available to run
With the Q0 switch in this position the unit can be enabled using
the additional connections available on the connection terminals.
A closed loop will identify an enable signal, this can come from a
remote switch or a timer by example.
The Keypad enable signal cannot be modified with the user password level. If it is set to Disable
contact your local maintenance to check if it can be changed to Enable.
The last enable signal is coming through the high level interface, that mean from a Building
Management System. From a BMS connected to the UC using a communication protocol the unit
can be disabled. To see if the enable signal is coming from a BMS in the View/Set Unit and then
Status/Settings check the Control Source, if it is set to Network than the Network En SP setpoint in
the same page will reflect the actual signal coming from the BMS. If the value is set to Disable then
the unit cannot start. In this case check with your BAS company how the chiller is operated.
The Unit Status will inform about the current unit status, possible status will be described in the
following table:
Overall Status
Off:
Status
Ice Mode Tmr
OAT Lockout
All Cir Disabled
Unit Alarm
Keypad Disable
Loc/Rem Switch
BAS Disable
Master Disable
Scheduler Disabled
Description
This status can be shown only if the unit can work in Ice Mode. The unit is off
because the Ice setpoint has been satisfied. Unit will remain off until the Ice
Timer has expired.
The unit cannot run because the Oustide Air Temperature is below the limit
foreseen for the condenser temperature control system installed in this Unit. If
the Unit has to run anyway check with your local maintenance how to proceed.
No circuit is available to run. All circuits can be disabled by their individual enable
switch or can be disabled by a component safety condition active or can be
disabled by keypad or can be all in alarms. Check the individual circuit status for
further details.
A unit alarm is active. Check the alarm list to see what is the active alarm
inhibiting the unit to start and check if the alarm can be cleared. Refer to the
Troubleshooting section before proceeding.
The Unit has been disabled by keypad. Check with your local maintenance if it
can be enabled.
The Local/Remote enable switch is set to disable. Turn it to Local to enable the
unit to start its starting sequence.
Unit is disabled by BAS/BMS system. Check with the BAS company how to start
the unit.
Unit is disabled by the Master Slave function
Unit is disabled by the time scheduler.
Operation Manual
48
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
Test Mode
Auto
Auto:
Noise Reduction
Wait For Load
Evap Recirc
Wait For Flow
Pumpdn
Max Pulldn
Unit Cap Limit
Current Limit
OPERATION
MANUAL
Unit mode set to Test. This mode is activated to check operability of onboard
actuators and sensors. Check with the local maintenance if the Mode can be
reverted to the one compatible with unit application (View/Set Unit – Set-Up –
Available Modes).
Unit is in Auto control. The pump is running and at least one compressor is
running.
Unit is running with the Quiet Mode activated. Active setpoint may differ from
what has been set as cooling setpoint.
Unit is in standby because the thermostat control satisfied the active setpoint.
Unit is running the evaporator pump to equalize the water temperature in the
evaporator.
Unit pump is running but the flow signal still indicate a lack of flow through the
evaporator.
Unit is shutting down.
Unit thermostat control is limiting the unit capacity because the water
temperature is dropping at a rate that could exceed the active setpoint.
Demand limit has been hit. Unit capacity will not further increase.
Maximum current has been hit. Unit capacity will not further increase.
As soon as the unit status turns to Auto, the start sequence is initiated. The start sequence follows
the steps indicated in the simplified flowchart:
N
Is there any compressor available?
Start the Pump
N
Is Flow established?
Start Lead compressor
N
Is more capacity needed?
Start Lag compressor
Thermostat Capacity control
5.2.2 Preparing circuits to start
To allow a circuit start up is required to enable the circuit using the enable switch located on the
unit switchbox. Each circuit is equipped with a dedicated switch identified with Q1, Q2 (if available)
or Q3 (if available). The enable position is indicated with a 1 on the label whereas the 0 position
corresponds to disable.
The status of the circuit is indicated in the View/Set Circuit – Circuit #x – Status/Settings. The
possible status will be described in the following table.
Overall Status
Off:
Status
Ready
Stage Up Delay
Cycle Timer
BAS Disable
Keypad Disable
Circuit Switch
Description
Circuit is off waiting for a stage up signal from thermostat control
Circuit is off waiting for the stage up delay to expire.
Circuit is off waiting for the compressor cycle timer to expire
Circuit is off by BAS signal. Check with the BAS company how to start the unit.
Circuit is off by the local or remote HMI. Check with your local maintenance if it
can be enabled.
Circuit is off by Enable switch. Turn the Enable switch to 1 to allow the circuit
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
49
Air cooled inverter water chiller
Oil Heating
Alarm
Test Mode
Max Comp Starts
VFD Heating
Maintenance
EXV
Run:
Preopen
Pumpdown
Normal
Disch SH Low
Evap Press Low
Cond Press High
High LWT Limit
High VFD Amps
OPERATION
MANUAL
start up procedure to start
Circuit is off because the oil temperature is too low to guarantee a proper
lubrication of compressor. Heating resistor is activated to eliminate this
temporary condition. It’s suggested to power up the unit in advance to avoid this
limiting condition.
A circuit alarm is active. Check the alarm list to see what is the active alarm
inhibiting the circuit to start and check if the alarm can be cleared. Refer to the
Troubleshooting section before proceeding.
Circuit mode set to Test. This mode is activated to check operability of onboard
circuit actuators and sensors. Check with the local maintenance if the Mode can
be reverted to Enable.
Compressor starts exceed the maximum number of starts per hour.
Inverter on compressor cannot start because of low internal temperature.
Heating resistor is activated to eliminate this temporary condition. It’s suggested
to power up the unit in advance to avoid this limiting condition.
A component needs to be replaced or maintained. Refer to the Troubleshooting
section before proceeding.
EXV prepositioning before compressor starts.
Circuit is shutting down because of thermostat control or pumpdown alarm or
because the enable switch has been turned to off.
Circuit is running within the expected operational conditions.
Discharge superheat is below the acceptable value. This is a temporary
condition that should disappear after few minutes of operation.
Circuit is running with low evaporator pressure. This could be due to a transitory
condition or a lack of refrigerant. Check with the local maintenance if corrective
actions are required. Circuit is protected by preventive logic.
Circuit is running with high condenser pressure. This could be due to a transitory
condition or high ambient temperature or problems with the condenser fans.
Check with the local maintenance if corrective actions are required. Circuit will be
protected by preventive logic.
Circuit is running with a high water temperature. This is a temporary condition
that will limit the maximum compressor capacity. Reduction of the water
temperature will allow the compressor to reach the full capacity.
Inverter current is higher than the maximum allowed current. Preventive logic will
protect the inverter.
If the circuit is allowed to start, the starting sequence is initiated. Starting sequence is described in
a simplified version with the following flowchart.
Operation Manual
50
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
N
Is the circuit required to start?
Valve preopening
Compressor start
Wait thermostat command
N
Is a capacity adjustment required or is a preventive logic
active?
Adjust capacity
N
Shutdown signal for thermostat or alarm?
Pumpdown of circuit then switch compressor off
5.3 Compressor Capacity Control
Once a compressor is started, capacity will be modulated according to thermostat control
requirements. However, there are some limitations which override the capacity control in order to
prevent the chiller from abnormal running conditions. These preventions are summarized below:






Minimum Capacity
High Water Temperature
Low Evaporating Pressure
High Condensing Pressure
High VFD Current
High Discharge Temperature
5.3.1.1 High Water Temperature Limit
The only prevention that can activate at unit level will limit the maximum unit capacity to 80% when
the leaving water temperature exceeds 25°C. This condition will be displayed at circuit level to
indicate the capacity limitation.
Symptom
Unit maximum capacity equal to 80%
Cause
Leaving Evaporator water temperature
higher than 25°C
Solution
Wait until the water temperature drops
below 25°C
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
51
Air cooled inverter water chiller
OPERATION
MANUAL
5.3.1.2 Low Evaporating Pressure
When the circuit is running and the evaporating pressure drops below the safety limits (see section
4.11.1.2) the circuit control logic reacts at two different levels in order to recover the normal running
conditions.
If the evaporating pressure drops below the Low Pressure Hold limit, compressor is inhibited to
increase its running capacity. This condition is indicated on the controller display in the circuit
status as “Run: Evap Press Low”. The status is automatically cleared when the evaporating
pressure rise above the Low Pressure Hold limit by 14 kPa.
If the evaporating pressure drops below the Low Pressure Unld limit, compressor is unloaded in
order to recover the normal operating conditions. This condition is indicated on the controller
display in the circuit status as “Run: Evap Press Low”. The status is automatically cleared when the
evaporating pressure rise above the Low Pressure Hold limit by 14 kPa.
See section 6.1.7.1 to troubleshoot this problem.
5.3.1.3 High Condensing Pressure
When the circuit is running and the condensing pressure rises above the safety limits the circuit
control logic reacts at two different levels in order to recover the normal running conditions.
The two different levels, called High Pressure Hold and High Pressure Unload limits, are calculated
by the controller from the maximum condenser pressure allowed by the compressor envelope. This
value depends from evaporating pressure as reported in the figure below.
If the condensing pressure rises above the High Pressure Hold limit, compressor is inhibited to
increase its running capacity. This condition is indicated on the controller display in the circuit
status as “Run: Cond Press High”. The limit is calculated in terms of saturated condensing
temperature; the status is automatically cleared when the saturated condensing temperature rises
above the High Pressure Hold limit by 5.6°C.
If the condensing pressure rises above the High Pressure Unload limit, compressor is unloaded in
order to recover the normal operating conditions. This condition is indicated on the controller
display in the circuit status as “Run: Cond Press High”. The status is automatically cleared when
the saturated condensing temperature rises above the High Pressure Hold limit by 5.6°C.
See section 6.1.7.2 to troubleshoot this problem.
Operation Manual
52
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Cond. Sat. Temp.
Hi Press Trip
Hi Press Hold
Hi Press Unload
Safe Operation Area
Evap. Sat. Temp.
5.3.1.4 High Vfd Current
When the compressor is running and its output current rises above the safety limits the circuit
control logic reacts at two different levels in order to recover the normal running conditions. Safety
limits are calculated by the controller based on the selected compressor type.
If the running current rises above the Running Current Hold limit (101% of RLA), compressor is
inhibited to increase its running capacity. This condition is indicated on the controller display in the
circuit status as “Run: High VFD Amps”.
If the condensing pressure rises above the Running Current Unload limit (105% of RLA),
compressor is unloaded in order to recover the normal operating conditions. This condition is
indicated on the controller display in the circuit status as “Run: High VFD Amps”. The status is
automatically cleared when the running amps falls below the hold limit.
5.3.1.5 High Discharge Temperature
When the compressor is running and its discharge temperature rises above the safety limits the
circuit control logic reacts at two different levels in order to recover the normal running conditions.
If the discharge temperature rises above the Discharge Temperature Hold limit (95°C), compressor
is inhibited to increase its running capacity. This condition is indicated on the controller display in
the circuit status as “Run: High Discharge Temp”.
If the discharge temperature rises above the Discharge Temperature Unload limit (100°C),
compressor is unloaded in order to recover the normal operating conditions. This condition is
indicated on the controller display in the circuit status as “Run: High Discharge Temp”. The status
is automatically cleared when the discharge temperature falls below the hold limit.
5.4 Condensation Control
Condensing Pressure is controlled in order to achieve best chiller efficiency within compressor
envelope limits. Condenser pressure control is achieved through fan staging and/or fan speed
control, when the unit is equipped with fan speed regulation option. See chapter 0 for more details.
In particular, when the chiller operates at a low ambient temperature, a minimum condenser
saturated temperature is imposed, based on saturated evaporating temperature. This allows the
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
53
OPERATION
MANUAL
Air cooled inverter water chiller
compressor to operate within its envelope. This setpoint is further increased (see figure below) by
a quantity which depends from outside ambient temperature and compressor load in achieve the
best efficiency point, i.e. minimum energy consumption of compressor and fans.
Cond. Sat. Temp.
Cond Press @ 50%
Load
Cond Press @ 30%
load
Min Cond Press
Evap. Sat. Temp.
5.4.1 Fan Settings
The unit may be equipped with on/off fans, inverter fans or brushless fans. Based on the fan type,
different settings are required to the chiller controller and/or to the inverters.
5.4.1.1 Controller Settings
Controller settings for fans can be reviewed and changed in the menu
Commission Unit  Configuration  Unit
Fan
Configuration
Fan Type
On/Off
AC700
rpm)
AC900
rpm)
(default,
700
(optional,
900
Inverter
Brushless
AC700 (default, 700 rpm)
AC900 (optional, 900 rpm)
AC900L (optional, 700 rpm, up to 900
rpm)
EC900L (optional, 700 rpm, up to 900
rpm)
EC900 (optional, 900 rpm)
EC700 (optional, 700 rpm)
EC1000L (optional, 700 rpm, up to 1000
rpm)
On/Off and brushless fans do not need any additional settings. Inverter fans need instead to be set
up according to the list described in the following chapter.
Fans are activated according to the difference between the saturated condenser temperature and
the condensation target determined by the controller. If this difference exceeds the stage up or
stage down settings, an error accumulation is calculated. Once the error accumulation exceeds a
fixed threshold, a new step is activated or deactivated. If the saturated temperature returns to
within the deadband area, the error accumulation is cleared.
5.4.2 Fan VFD Settings
Units may be equipped optionally or as a standard with fan VFD control. Each circuit is organized
with two steps, arranged as per the following table. The two stages are activated according to the
same logic as described in the previous chapter.
Operation Manual
54
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
* ********
Inverters used for fan control may be of two types, according to the number of fans which they
control. Most parameters are valid for all, some other parameters (9900 series) are specific for the
inverter and fan type used. For further details please refer to the instruction manual of the inverters
included in the documentation of the unit.
Inverter parameter list – 1 fan control
Parameter
Description
1611
1002
1301
1601
1604
2006
2101
2202
2203
2603
2604
2606
2609
2618
3006
3104
3108
9906
9908
9909
Param View
Ext commands
Min AI1
Run Enable
Fault Reset
Undervoltage
Start Function
Acceleration Time
Deceleration Time
IR compensation Volt
IR comp. frequency
Switching Frequency
Noise Smoothing
FW voltage
Motor Thermal Time Constant
AR Overcurrent
AR External Fault
Motor In
Motor Speed
Motor Power
Fan Type
AC900
AC700
Long View
Long View
NOT SEL
NOT SEL
0%
0%
DI1
DI1
DI1
DI1
Enable
Enable
AUTO
AUTO
10 s
10 s
10 s
10 s
10.5
10.5
50%
50%
8kHz
8kHz
Enable
Enable
400 V
400 V
350 s
350 s
Enable
Enable
Disable
Disable
4.0 A
2.7 A
900 rpm
700 rpm
1.2 kW
0.7 kW
Inverter parameter list – 2 fan control
Parameter
Description
1611
1002
1301
1601
1604
2006
2101
2202
2203
2603
2604
2606
2609
2618
3006
3104
3108
9906
9908
9909
Param View
Ext commands
Min AI1
Run Enable
Fault Reset
Undervoltage
Start Function
Acceleration Time
Deceleration Time
IR compensation Volt
IR comp. frequency
Switching Frequency
Noise Smoothing
FW voltage
Motor Thermal Time Constant
AR Overcurrent
AR External Fault
Motor In
Motor Speed
Motor Power
Fan Type
AC900
AC700
Long View
Long View
NOT SEL
NOT SEL
0%
0%
DI1
DI1
DI1
DI1
Enable
Enable
AUTO
AUTO
10 s
10 s
10 s
10 s
10.5
10.5
50%
50%
8kHz
8kHz
Enable
Enable
400 V
400 V
350 s
350 s
Enable
Enable
Disable
Disable
8.0 A
5.4 A
900 rpm
700 rpm
2.4 kW
1.4 kW
5.5 EXV Control
As a standard, the unit is equipped with one electronic expansion valve (EXV) per circuit, moved
by a stepper motor. The EXV controls the suction superheat in order to optimize evaporator
efficiency and avoid at the same time suction of liquid to the compressor.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
55
OPERATION
MANUAL
Air cooled inverter water chiller
The controller integrates a PID algorithm which manages the dynamic response of the valve in
order to keep a satisfactory quick and stable response to system parameter variations. PID
parameters are embedded into the controller and cannot be changed. The EXV has the following
operating modes:



Pre-open
Pressure
Superheat
When the circuit is required to start, the EXV will go into the Pre-open. After that, the EXV can
change to Pressure Control. The compressor will start synchronously with this transition.
In Pressure control, the EXV is positioned to control the evaporator pressure. The pressure target
varies based on evaporator LWT and discharge superheat values.
When the EXV transitions to the Superheat control, the target is gradually changed until reaching
the normal calculated target. The superheat target varies to avoid that liquid refrigerant droplets
could reach the compressor. This target is constantly updated, and averaged over a 10 second
period.
The transition from Pressure Control to Superheat Control requires all of the following:


Evap LWT <= 15.5°C,
Refrigerant circuit stabilized.
The transition from Superheat Control to Pressure Control may happen only if the water
temperature increases again for any reason above the Maximum Operating Pressure (MOP) limit.
This will occur if the following condition exists:

Evap Press > 370kPa (MOP)
Whenever the circuit is running, the EXV position is limited between 5% or 100% position.
Any time the circuit is in the Off or starts the shutdown procedure, the EXV shall be in the closed
position. In this case additional closing steps are commanded to guarantee a proper recovery of
the zero position.
Expansion valve driver is equipped with UPS module to safely close the expansion valve in case of
power failure.
5.6 Economizer Control
The circuit economizer will be activated if all the following conditions apply:





Circuit in Run state
Compressor speed > Econ En Spd
Circuit Pressure Ratio > Econ Act PR
Discharge Superheat > 22°C (This condition is ignored with the EWAD TZ B)
Percent RLA < 95%
Operation Manual
56
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
The economizer will be deactivated if one of the following conditions apply:



Circuit in Off state
Circuit Pressure Ratio < Econ Act PR – 0.3
Discharge Superheat < 17°C (This condition is ignored with the EWAD TZ B)
5.7 Liquid Injection Control
Liquid injection will be activated when the discharge temperature rises above a safety limit
temperature to avoid compressor components overheating.
Liquid injection will be turned off when the discharge temperature decreases below the activation
setpoint by a differential of 5°C.
5.8 Variable Volume Ratio Control
Compressor Volume Ratio is controlled through VR slides in the compressor. These slides adapt
discharge port geometry to achieve optimum compressor efficiency according to chiller operating
conditions.
VR slides are moved between two positions, called VR2 (corresponding to a volume ratio 2.0) and
VR3 (corresponding to a volume ratio 3). At compressor off, no slide valve is excited.


At startup, slide is positioned to VR3.
In running condition the selection between VR2 and VR3 will be done automatically to
maximize compressor efficiency.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
57
OPERATION
MANUAL
Air cooled inverter water chiller
6 Alarms
The UC protects the unit and the components from operating in abnormal conditions. Protections
can be divided in preventions and alarms. Alarms can then be divided in pump-down and rapid
stop alarms. Pump-down alarms are activated when the system or sub-system can perform a
normal shutdown in spite of the abnormal running conditions. Rapid stop alarms are activated
when the abnormal running conditions require an immediate stop of the whole system or subsystem to prevent potential damages.
The UC displays the active alarms in a dedicated page and keep an history of the last 50 entries
divided between alarms and acknowledges occurred. Time and date for each alarm event and of
each alarm acknowledge are stored.
The UC also stores alarm snapshot of each alarm occurred. Each item contains a snapshot of the
running conditions right before the alarm has occurred. Different sets of snapshots are
programmed corresponding to unit alarms and circuit alarms holding different information to help
the failure diagnosis.
6.1.1
Unit Warning Alarms
6.1.1.1 Rapid Recovery Module Communication Fail
This alarm is generated in case of communication problems with the RRC module.
Symptom
Bell icon is moving on controller’s
display.
String in the alarm list:
RpdRcvryCommFail
String in the alarm log:
 RpdRcvryCommFail
String in the alarm snapshot
RpdRcvryCommFail
Cause
Module has no power supply
Module address is not properly set
Module is broken
Solution
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is
tightly inserted in the module
Check if module’s address is correct
referring to the wiring diagram.
Check if LED are on and both green.
If BSP LED is solid red replace the
module
Check if power supply is ok but LEDs
are both off. In this case replace the
module
6.1.1.2 Fan Alarm Module Communication Fail
This alarm is generated in case of communication problems with the FAC module.
Symptom
Bell icon is moving on controller’s
display.
String in the alarm list:
FanMdlCommFail
String in the alarm log:
 FanMdlCommFail
String in the alarm snapshot
FanMdlCommFail
Cause
Module has no power supply
Module address is not properly set
Module is broken
Solution
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is
tightly inserted in the module
Check if module’s address is correct
referring to the wiring diagram.
Check if LED are on and both green.
If BSP LED is solid red replace the
module
Check if power supply is ok but LEDs
are both off. In this case replace the
Operation Manual
58
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
module
6.1.1.3 Energy Meter Communication Fail
This alarm is generated in case of communication problems with the energy meter.
Symptom
Bell icon is moving on controller’s
display.
String in the alarm list:
EnergyMtrCommFail
String in the alarm log:
 EnergyMtrCommFail
String in the alarm snapshot
EnergyMtrCommFail
Cause
Module has no power supply
Modbus parameters not properly set
Module is broken
Solution
Refer to the datasheet of the specific
component to see if it is correctly
powered
Referring to the datasheet of the
specific component to see if the
modbus parameters are set correctly:
Address = 20
Baud Rate =19200 kBs
Parity = None
Stop bits =1
Check if LED are on and both green.
If BSP LED is solid red replace the
module
Check if power supply is ok but LEDs
are both off. In this case replace the
module
6.1.1.4 External Event
This alarm indicates that a device, whose operation is linked with this machine, is reporting a
problem.
Symptom
Unit status is Run.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitExternalEvent
String in the alarm log:
UnitExternalEvent
String in the alarm snapshot
UnitExternalEvent
Cause
There is an external event that has
caused the opening, for at least 5
seconds, of the digital input on the
controller board.
Solution
Check for reasons of external event
and if it can be a potential problem for
a correct chiller operation.
NOTE: What above applies in case of USER configuration of the external fault digital input as Event (see section
Errore. L'origine riferimento non è stata trovata.)
6.1.1.5 Heat Recovery Entering Water Temperature sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitAlHREwtSen
String in the alarm log:
 UnitAlHREwtSen
String in the alarm snapshot
UnitAlHREwtSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
according table and allowed kOhm
(k) range.
Check correct sensors operation
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.1.6 Heat Recovery Leaving Water Temperature sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
59
OPERATION
MANUAL
Air cooled inverter water chiller
Symptom
Heat Recovery is Off
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitAlHRLvgSen
String in the alarm log:
 UnitAlHRLvgSen
String in the alarm snapshot
UnitAlHRLvgSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
according table and allowed kOhm
(k) range.
Check correct sensors operation
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.1.7 Switch Box Temperature sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Heat Recovery is Off
Bell icon is moving on controller’s
display.
Bell icon is moving on controller’s
display.
String in the alarm list:
SwitchBoxTempSen
String in the alarm log:
 SwitchBoxTempSen
String in the alarm snapshot
SwitchBoxTempSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
according table and allowed kOhm
(k) range.
Check correct sensors operation
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.1.8 Heat Recovery Water Temperatures inverted
This alarm is generated any time that the heat recovery entering water temperature is lower than
the leaving by 1°C and at least one compressor is running.
Symptom
Bell icon is moving on controller’s
display.
Bell icon is moving on controller’s
display.
String in the alarm list:
Unit HRInvAl
String in the alarm log:
 Unit HRInvAl
String in the alarm snapshot
Unit HRInvAl
Cause
Entering
and
leaving
water
temperature sensors are inverted.
Entering and leaving water pipes are
reversed
Water pump operate reverse.
Solution
Check cabling of the sensors on the
unit controller.
Check offset of the two sensors with
the water pump running
Check if the water flows in counter
flow respect to refrigerant.
Check if the water flows in counter
flow respect to refrigerant.
6.1.1.9 Bad Demand Limit Input
This alarm is generated when the Demand Limit option has been enabled and the input to the
controller is out of the admitted range.
Symptom
Cause
Solution
Operation Manual
60
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
Unit status is Run.
Bell icon is moving on controller’s
display.
Demand Limit function cannot be
used.
String in the alarm list:
BadDemandLimitInput
String in the alarm log:
BadDemandLimitInput
String in the alarm snapshot
BadDemandLimitInput
Demand limit input out of range
For this warning out of range is
considered to be a signal less than
3mA or more than 21mA.
OPERATION
MANUAL
Check for values of input signal to the
unit controller. It has to be in the
allowed mA range;
Check for electrical shielding of
wirings.
Check for right value of the unit’s
controller output in case input signal
is into allowed range.
6.1.1.10 Bad Leaving Water Temperature Reset Input
This alarm is generated when the Setpoint Reset option has been enabled and the input to the
controller is out of the admitted range.
Symptom
Unit status is Run.
Bell icon is moving on controller’s
display.
LWT Reset function cannot be used.
String in the alarm list:
BadSetPtOverrideInput
String in the alarm log:
 BadSetPtOverrideInput
String in the alarm snapshot
BadSetPtOverrideInput
Cause
LWT reset input signal is out of range.
For this warning out of range is
considered to be a signal less than
3mA or more than 21mA.
Solution
Check for values of input signal to the
unit controller. It has to be in the
allowed mA range.
Check for electrical shielding of
wirings.
Check for right value of the unit’s
controller output in case input signal
is into allowed range.
6.1.1.11 Bad Current Limit Input
This alarm is generated when the Flexible Current Limit option has been enabled and the input to
the controller is out of the admitted range.
Symptom
Unit status is Run.
Bell icon is moving on controller’s
display.
Flexible Current Limit function cannot
be used.
String in the alarm list:
BadCurrentLimitInput
String in the alarm log:
 BadCurrentLimitInput
String in the alarm snapshot
BadCurrentLimitInput
6.1.2
Cause
Flexible current limit input out of
range.
For this warning out of range is
considered to be a signal less than
3mA or more than 21mA.
Solution
Check for values of input signal to the
unit controller. It has to be in the
allowed mA range.
Check for electrical shielding of
wirings.
Check for right value of the unit’s
controller output in case input signal
is into allowed range.
Unit Problems
6.1.2.1 Outside Air Temperature (OAT) Lockout
Symptom
Unit Status is StartInhbtAmbTemp.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
------------------------------String in the alarm log:
-------------------------------String in the alarm snapshot
Cause
Outside ambient temperature is
lower than value set into unit’s
controller.
Solution
Check the minimum outside
ambient temperature value set into
the unit’s controller.
Improper operation of Outside
Ambient Temperature sensor.
Check if this value is in accordance
with chiller application, therefore
check about the proper application
and utilization of the chiller.
Check for proper operation of OAT
sensor according information about
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
61
OPERATION
MANUAL
Air cooled inverter water chiller
---------------------------------
kOhm (k) range related to
temperature values.
6.1.2.2 Evaporator Pump #1 Failure
This alarm is generated if the pump is started but the flow switch is not able to close.
Symptom
Unit could be ON.
Bell icon is moving on controller’s
display.
Backup pump is used or stop of all
circuits in case of pump #2 failure.
String in the alarm list:
EvapPump1Fault
String in the alarm log:
 EvapPump1Fault
String in the alarm snapshot
EvapPump1Fault
Cause
Pump nr.1 may not be oerating.
Flow Switch doesn’t operate
properly
Solution
Check for problem in electrical
wiring of the pump #1.
Check that electrical breaker of
pump #1 is tripped.
Check for problem in wiring
connection between pump starter
and unit controller.
Check the water pump filter and the
water circuit for obstructions.
Check flow switch connection and
calibration.
6.1.2.3 Evaporator Pump #2 Failure
Symptom
Unit could be ON.
Bell icon is moving on controller’s
display.
Backup pump is used or stop of all
circuits in case of pump #1 failure.
String in the alarm list:
EvapPump2Fault
String in the alarm log:
 EvapPump2Fault
String in the alarm snapshot
EvapPump2Fault
6.1.3
Cause
Pump nr.2 does not work.
Flow Switch doesn’t operate
properly
Solution
Check for problem in electrical
wiring of the pump #1.
Check that electrical breaker of
pump #2 is tripped.
Check for problem in wiring
connection between pump starter
and unit controller.
Check the water pump filter and the
water circuit for obstructions.
Check flow switch connection and
calibration.
Unit Pumpdown Stop Alarms
6.1.3.1 Evaporator Entering Water Temperature (EWT) sensor fault
This alarm is generated any time the input resistance is out of an acceptable range.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffEvpEntWTempSen
String in the alarm log:
 UnitOffEvpEntWTempSen
String in the alarm snapshot
UnitOffEvpEntWTempSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
according table and allowed kOhm
(k) range.
Check correct sensors operation
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.3.2 Outdoor Ambient Temperature sensor fault alarm
This alarm is generated any time the input resistance is out of an acceptable range.
Operation Manual
62
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown precedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffAmbTempSen
String in the alarm log:
 UnitOffAmbTempSen
String in the alarm snapshot
UnitOffAmbTempSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
Check correct sensors operation
according table and allowed kOhm
(k) range.
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.3.3 Evaporator Water Temperatures inverted
This alarm is generated any time the entering water temperature is lower than the leaving by 1°C
and at least one compressor is running.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown precedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffEvpWTempInvrtd
String in the alarm log:
 UnitOffEvpWTempInvrtd
String in the alarm snapshot
UnitOffEvpWTempInvrtd
6.1.4
Cause
Entering
and
leaving
water
temperature sensors are inverted.
Entering and leaving water pipes are
reversed
Water pump operate reverse.
Solution
Check cabling of the sensors on the
unit controller.
Check offset of the two sensors with
the water pump running
Check if the water flows in counter
flow respect to refrigerant.
Check if the water flows in counter
flow respect to refrigerant.
Unit Rapid Stop Alarms
6.1.4.1 Power Fault (only with the UPS option)
This alarm is generated when the main power is Off and the unit controller is powered by the UPS.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons. In case of doubts contact your maintenance company.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
Power Fault
String in the alarm log:
 Power Fault
String in the alarm snapshot
Power Fault
Cause
Loss of one phase.
Not correct sequence connection of
L1,L2,L3.
Voltage level on the unit’s panel is not
in the allowed range (±10%).
Solution
Check voltage level on each of the
phases.
Check sequence of L1, L2, L3
connections according indication on
chiller’s electrical scheme.
Check that voltage level on each
phases is into the allowed range that
is indicated on the chiller label.
Is important to check the voltage level
on each phases not only with chiller
not running, but mainly with chiller
running from minimum capacity up to
full load capacity. That's because
voltage drop can occur from a certain
unit cooling capacity level, or
because of certain working condition
(i.e. high values of OAT);
In these cases the issue can be
related with the sizing of power
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
63
OPERATION
MANUAL
Air cooled inverter water chiller
There is a short-circuit on the unit.
cables.
Check for correct electrical isolation
condition of each unit’s circuit with a
Megger tester.
6.1.4.2 Evaporator Leaving Water Temperature (LWT) sensor fault
This alarm is generated any time that the input resistance is out of an acceptable range.
Symptom
Unit status is Off.
All circuits are stopped with a normal
shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffLvgEntWTempSen
String in the alarm log:
 UnitOffLvgEntWTempSen
String in the alarm snapshot
UnitOffEvpLvgWTempSen
Cause
Sensor is broken.
Solution
Check for sensor integrity.
according table and allowed kOhm
(k) range.
Check correct sensors operation
Sensor is shorted.
Sensor is not properly connected
(open).
Check if sensor is shorted with a
resistance measurement.
Check for absence of water or
humidity on electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.4.3 Emergency Stop
This alarm is generated any time the Emergency Stop button is activated.
Before resetting the Emergency Stop button please verify that the harmful condition has been
removed.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffEmergencyStop
String in the alarm log:
 UnitOffEmergencyStop
String in the alarm snapshot
UnitOffEmergencyStop
Cause
Emergency stop button has been
pushed.
Solution
Turning counterclockwise the
emergency stop button, the alarm
should be cleared.
Emergency stop button is not pushed
Check electrical connection between
the button and the controller.
6.1.4.4 OptionCtrlrCommFail
This alarm is generated in case of communication problems with the AC module.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
OptionCtrlrCommFail
String in the alarm log:
 OptionCtrlrCommFail
String in the alarm snapshot
OptionCtrlrCommFail
Cause
Module has no power supply
Module address is not properly set
Module is broken
Solution
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is
tightly inserted in the module
Check if module’s address is correct
referring to the wiring diagram.
Check if LED are on and both green.
If BSP LED is solid red replace the
module
Check if power supply is ok but LEDs
are both off. In this case replace the
module
Operation Manual
64
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
6.1.4.5 EXV Driver Error
This alarm is generated in case of communication problem with a exv driver module (EEXV1 or
EEXV2).
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffEXVCrtlrComFail
String in the alarm log:
 Cx OffEXVCrtlrComFail
String in the alarm snapshot
Cx OffEXVCrtlrComFail
Cause
Module has no power supply
Module address is not properly set
Module is broken
Solution
Check the power supply from the
connector on the side of the module.
Check if LEDs are both green.
Check if the connector on the side is
tightly inserted in the module
Check if module’s address is correct
referring to the wiring diagram.
Check if LED are on and both green.
If BSP LED is solid red replace the
module
Check if power supply is ok but LEDs
are both off. In this case replace the
module
6.1.4.6 PVM alarm
This alarm is generated in case of problems with the power supply to the chiller.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons. In case of doubts contact your maintenance company.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffPhaveVoltage
String in the alarm log:
 UnitOffPhaveVoltage
String in the alarm snapshot
UnitOffPhaveVoltage
Cause
Loss of one phase.
Not correct sequence connection of
L1,L2,L3.
Voltage level on the unit’s panel is not
in the allowed range (±10%).
There is a short-circuit on the unit.
Solution
Check voltage level on each of the
phases.
Check sequence of L1, L2, L3
connections according indication on
chiller’s electrical scheme.
Check that voltage level on each
phases is into the allowed range that
is indicated on the chiller label.
Is important to check the voltage level
on each phases not only with chiller
not running, but mainly with chiller
running from minimum capacity up to
full load capacity. That's because
voltage drop can occur from a certain
unit cooling capacity level, or
because of certain working condition
(i.e. high values of OAT);
In these cases the issue can be
related with the sizing of power
cables.
Check for correct electrical isolation
condition of each unit’s circuit with a
Megger tester.
6.1.4.7 Evaporator Flow Loss alarm
This alarm is generated in case of flow loss to the chiller to protect the machine against freezing.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Cause
No water flow sensed for 30 seconds
continuously or water flow too low.
Solution
Check the water pump filler and the
water circuit for obstructions.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
65
OPERATION
MANUAL
Air cooled inverter water chiller
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffEvapWaterFlow
String in the alarm log:
 UnitOffEvapWaterFlow
String in the alarm snapshot
UnitOffEvapWaterFlow
Check the flow switch calibration and
adapt to minimum water flow.
Check if pump impeller can rotate
freely and has no damages.
Check pumps protection devices
(circuit breakers, fuses, inverters,
etc.)
Check flow switch connections.
6.1.4.8 Evaporator Water Freeze Protect alarm
This alarm is generated to indicate that the water temperature (entering or leaving) has dropped
below a safety limit. Control tries to protect the heat exchanger starting the pump and letting the
water circulate.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOffEvapWaterTmpLo
String in the alarm log:
 UnitOffEvapWaterTmpLo
String in the alarm snapshot
UnitOffEvapWaterTmpLo
Cause
Water flow too low.
Solution
Increase the water flow.
Inlet temperature to the evaporator is
too low.
Flow switch is not working or no water
flow.
Increase the inlet water temperature.
Refrigerant temperature become too
low (< -0.6°C).
Check the water flow and filter. No
good heat exchange condition into the
evaporator.
Check the water temperatures with a
proper instrument and adjust the
offsets
Sensors
readings
(entering
or
leaving) are not properly calibrated
Check the flow switch and the water
pump.
6.1.4.9 Heat Recovery Water Freeze Protect alarm
This alarm is generated to indicate that the heat recovery water temperature (entering or leaving)
has dropped below a safety limit. Control tries to protect the heat exchanger starting the pump and
letting the water circulate.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
UnitOff HRFreeze
String in the alarm log:
 UnitOff HRFreeze
String in the alarm snapshot
UnitOff HRFreeze
Cause
Water flow too low.
Solution
Increase the water flow.
Inlet temperature to the heat recovery
is too low.
Sensors
readings
(entering
or
leaving) are not properly calibrated
Increase the inlet water temperature.
Check the water temperatures with a
proper instrument and adjust the
offsets
6.1.4.10 External alarm
This alarm is generated to indicate that an external device whose operation is linked with this unit
operation. This external device could be a pump or an inverter.
Symptom
Cause
Solution
Operation Manual
66
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Unit status is Off.
There is an external event that has Check causes of the external event or
All circuits are switched off with the caused the opening, for at least 5 alarm.
normal shutdown procedure.
seconds, of the port on the controller
Bell icon is moving on controller’s board.
Check electrical wiring from unit
display.
controller to the external equipment in
String in the alarm list:
case of any external events or alarms
UnitOffExternalAlarm
have been occurred.
String in the alarm log:
 UnitOffExternalAlarm
String in the alarm snapshot
UnitOffExternalAlarm
NOTE: What above applies in case of USER configuration of the external fault digital input as Alarm (see section
Errore. L'origine riferimento non è stata trovata.)
6.1.5
Circuit Warning Alarms
6.1.5.1 Failed Pumpdown
This alarm is generated to indicate that the circuit hadn’t been able to remove all the refrigerant
from the evaporator.
Symptom
Circuit status is Off.
No indications on the screen
String in the alarm list:
-String in the alarm log:
 Cx Failed Pumpdown
String in the alarm snapshot
Cx Failed Pumpdown
Cause
EEXV is not closing completely,
therefore there’s “short-circuit”
between high pressure side with low
pressure side of the circuit.
Solution
Check for proper operation and full
closing position of EEXV. Sight glass
should not show refrigerant flow after
the valve is closed.
Check LED on the top of the valve, C
LED should be solid green. If both
LED are blinking alternately the valve
motor is not properly connected.
Evaporating pressure sensor is not
working properly.
Check for proper operation of
evaporating pressure sensor.
Compressor on circuit is internally
damaged with a mechanical problems
for example on internal check-valve,
or on internal spirals or vanes.
Check compressors on circuits.
6.1.5.2 Economizer Temperature Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Circuit status is On.
Economizer is Off.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx EcoTempSen
String in the alarm log:
 Cx EcoTempSen
String in the alarm snapshot
Cx EcoTempSen
Cause
Sensor is shorted.
Sensor is broken.
Sensor is not good connected (open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k) range related to temperature
values.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according with electrical scheme.
6.1.5.3 Economizer Pressure Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
67
OPERATION
MANUAL
Air cooled inverter water chiller
Symptom
Circuit status is On.
Economizer is Off.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx EcoPressSen
String in the alarm log:
 Cx EcoPressSen
String in the alarm snapshot
Cx EcoPressSen
Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about mVolt
(mV) range related to pressure values
in kPa.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe. The
transducer must be able to sense the
pressure through the valve’s needle.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.5.4 Gas Leakage Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Circuit status is On.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx GasLeakSen
String in the alarm log:
 Cx GasLeakSen
String in the alarm snapshot
Cx GasLeakSen
Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about mVolt
(mV) range related to ppm values.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.5.5 CxCmp1 MaintCode01
This alarm indicates that a component in the inverter may require verification or even a
replacement.
Symptom
Circuit status is On.
The compressor keep operating as
normal.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 MainCode01
String in the alarm log:
 CxCmp1 MainCode01
String in the alarm snapshot
CxCmp1 MainCode01
Cause
The inverter cooling valve in the
inverter, may require a verification or
a replacement.
Solution
Contact your service organization to
get the problem solved.
Operation Manual
68
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
6.1.5.6 CxCmp1 MaintCode02
This alarm indicates that a component in the inverter may require verification or even a
replacement.
Symptom
Circuit status is On.
The compressor keep operating as
normal.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 MainCode02
String in the alarm log:
 CxCmp1 MainCode02
String in the alarm snapshot
CxCmp1 MainCode02
Cause
The condenser in the inverter, may
require
a
verification
or
a
replacement.
Solution
Contact your service organization to
get the problem solved.
6.1.5.7 Fan Fault
This alarm indicates that at least one of the fans could has some problems
Symptom
Circuit status is On.
The compressor keep operating as
normal.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx FanAlm
String in the alarm log:
 Cx FanAlm
String in the alarm snapshot
Cx FanAlm
Cause
At least one of the fan has some
problems
Solution
In case of on/off fan check the
thermal magnetic circuit breaker of
each fan. The fan could absorbs too
much current
In case of fan with VFD check the
alarm output of the and message
error provided by each fan VFD
6.1.5.8 Power Loss
This alarm indicates that a short under voltage on main power supply, that does not turn off the
unit, has occurred.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons. In case of doubts contact your maintenance company.
Symptom
Circuit status is On.
The controller brings the compressor
to the minimum speed and then
normal operation is recovered (default
1200rmp)
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx FanAlm
String in the alarm log:
 Cx FanAlm
String in the alarm snapshot
Cx FanAlm
Cause
Chiller main power supply had a down
peak which caused the trip.
Solution
Check if main power supply is within
the acceptable tolerance for this
chiller
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
69
OPERATION
MANUAL
Air cooled inverter water chiller
6.1.6
Circuit Pumpdown Stop Alarms
6.1.6.1 Suction Temperature Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffSuctTempSen
String in the alarm log:
 CxCmp1 OffSuctTempSen
String in the alarm snapshot
CxCmp1 OffSuctTempSen
Cause
Sensor is shorted.
Sensor is broken.
Sensor is not good connected (open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k) range related to temperature
values.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according with electrical scheme.
6.1.6.2 Discharge Temperature Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffDischTmpSen
String in the alarm log:
 CxCmp1 OffDischTmpSen
String in the alarm snapshot
CxCmp1 OffDischTmpSen
Cause
Sensor is shorted.
Sensor is broken.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about kOhm
(k) range related to temperature
values.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according with electrical scheme.
6.1.6.3 Oil Pressure Sensor fault
This alarm is generated to indicate that the sensor is not reading properly.
Symptom
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffOilFeedPSen
String in the alarm log:
 CxCmp1 OffOilFeedPSen
String in the alarm snapshot
Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about mVolt
(mV) range related to pressure values
in kPa.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe. The
transducer must be able to sense the
Operation Manual
70
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
CxCmp1 OffOilFeedPSen
pressure through the valve’s needle.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.6.4 High Compressor Vfd Temperature fault
This alarm is generated to indicate that the Vfd temperature is too high to allow the compressor to
run.
Symptom
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 VfdOverTemp
String in the alarm log:
 CxCmp1 VfdOverTemp
String in the alarm snapshot
CxCmp1 VfdOverTemp
Cause
Cooling solenoid
operating properly.
valve
is
not
Vfd Heater not properly connected.
Solution
Check electrical connection of the
solenoid valve.
Check refrigerant charge. Low
refrigerant
charge
can
cause
overheating of the Vfd electronic.
Check for obstructions in the pipe.
Check if Vfd heater is switched off
when the Vfd temperature increases.
Check if the contactor that commands
the Vfd heater can switch propertly.
6.1.6.5 Low Compressor Vfd Temperature fault
This alarm is generated to indicate that the Vfd temperature is too low to allow the compressor to
run.
Symptom
Circuit status is Off.
The circuit is switched off with the
normal shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 VfdLowTemp
String in the alarm log:
 CxCmp1 VfdLowTemp
String in the alarm snapshot
CxCmp1 VfdLowTemp
Cause
Cooling solenoid valve is not
operating properly. It’s always open
when compressor runs.
Solution
Check electrical connection of the
solenoid valve.
Check operation of the valve to see if
it can close properly.
Vfd heater is not working.
Check operating cycles of the valve. It
has a limited number of cycles.
Check if the Vfd heater is powered.
Check if the Vfd heater is
commanded
on
when
Vfd
temperature is low.
6.1.6.6 Low Discharge Superheat fault
This alarm indicates that the unit has worked for too much time with low discharge super heat.
Symptom
Circuit status is Off.
The circuit is switched off with the
shutdown procedure.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffDishSHLo
String in the alarm log:
 CxCmp1 OffDishSHLo
String in the alarm snapshot
CxCmp1 OffDishSHLo
Cause
EEXV is not working correctly.
It’s not opening enough or it’s moving
in the opposite direction.
Solution
Check if pump-down can be finished
for pressure limit reached;
Check valve movements.
Check connection to the valve driver
on the wiring diagram.
Measure the resistance of each
winding, it has to be different from 0
Ohm.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
71
Air cooled inverter water chiller
OPERATION
MANUAL
6.1.6.7 Gas Leakage fault
This alarm indicates a gas leakage in the compressor box.
Symptom
Circuit status is Off.
The circuit is switched off with the
shutdown procedure performing a
deep pumpdown of the circuit.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffGasLeakage
String in the alarm log:
 Cx OffGasLeakage
String in the alarm snapshot
Cx OffGasLeakage
6.1.7
Cause
Gas leakage in the compressors box.
Solution
Switch off the unit and perform a gas
leakage test.
Gas leakage sensor fault.
Put the sensor in open air and check
that the alarm can be cleared. In case
replace the sensor or disable the
option before getting a new part.
Circuit Rapid Stop Alarms
6.1.7.1 Low Pressure alarm
This alarm is generated in case the evaporating pressure drops below the Low Pressure Unload
and the control is not able to compensate to this condition.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped immediately.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffEvpPressLo
String in the alarm log:
 CxCmp1 OffEvpPressLo
String in the alarm snapshot
CxCmp1 OffEvpPressLo
Cause
Transitory condition like a fan staging.
Refrigerant charge is low.
Protection limit not set to fit customer
application.
High Evaporator Approach.
Water flow into water heat exchanger
is too low.
Evaporating pressure transducer is
not working properly.
EEXV is not working correctly.
It’s not opening enough or it’s moving
in the opposite direction.
Water temperature is low
Solution
Wait until the condition is recovered
by EXV control
Check sight glass on liquid line to see
if there is flash gas.
Measure sub-cooling to see if the
charge is correct.
Check the evaporator approach and
the corresponding water temperature
to evaluate the low pressure hold
limit.
Clean the evaporator
Check the quality of the fluid that
flows into heat exchanger.
Check the glycol percentage and type
(ethilenic or propilenic)
Increase the water flow.
Check the sensor for proper operation
and calibrate the readings with a
gauge.
Check if pump-down can be finished
for pressure limit reached;
Check valve movements.
Check connection to the valve driver
on the wiring diagram.
Measure the resistance of each
winding, it has to be different from 0
Ohm.
Increase inlet water temperature.
Check the low pressure safeties
settings.
Operation Manual
72
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
6.1.7.2 High Pressure alarm
This alarm is generated in case the Condenser saturated temperature rise above the Maximum
condenser saturated temperature and the control is not able to compensate to this condition. The
maximum condenser saturated temperature is 68.5°C but it can decrease when the evaporator
saturated temperature become negative.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffCndPressHi
String in the alarm log:
 CxCmp1 OffCndPressHi
String in the alarm snapshot
CxCmp1 OffCndPressHi
Cause
One or more condenser fans do not
operate properly.
Dirty or partially blocked condenser
coil.
Inlet air temperature of the condenser
is too high.
One or more condenser
fan turning in wrong
direction.
Excessive charge of
refrigerant into the unit.
Condensing pressure transducer
could not operate properly.
Solution
Check if fans protections have been
activated.
Check that the fans can turn freely.
Check that there is not any obstacle
to the free ejection of the air blown.
Remove any obstacle;
Clean the condenser coil using soft
brush and blower.
The air temperature measured at the
inlet of the condenser may not exceed
the limit indicated in the operational
range (working envelope) of the
chiller.
Check the location where the unit is
installed and check that there are no
any short circuit of the hot-air blown
from the fans of the same unit, or
even from fans of next chillers (Check
IOM for proper installation).
Check for correct phases sequence
(L1, L2, L3) in the electrical
connection of the fans.
Check liquid sub-cooling and suction
super-heat to control indirectly the
correct
charge
of
refrigerant.
If necessary recover all the refrigerant
to weight the entire charge and to
control if the value is in line with kg
indication on unit label.
Check for proper operation of the high
pressure sensor.
6.1.7.3 Mechanical High Pressure Alarm
This alarm is generated when the condenser pressure rises above the mechanical high pressure
limit causing this device to open the power supply to all the auxiliary relays. This causes an
immediate shutdown of compressor and all the other actuators in this circuit.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffMechPressHi
String in the alarm log:
 CxCmp1 OffMechPressHi
String in the alarm snapshot
CxCmp1 OffMechPressHi
Cause
One or more condenser fans do not
operate properly.
Dirty or partially blocked condenser
coil.
Inlet air temperature of the condenser
is too high.
Solution
Check if fans protections have been
activated.
Check that the fans can turn freely.
Check that there is not any obstacle
to the free ejection of the air blown.
Remove any obstacle;
Clean the condenser coil using soft
brush and blower.
The air temperature measured at the
inlet of the condenser may not exceed
the limit indicated in the operational
range (working envelope) of the
chiller.
Check the location where the unit is
installed and check that there are no
any short circuit of the hot-air blown
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
73
OPERATION
MANUAL
Air cooled inverter water chiller
from the fans of the same unit, or
even from fans of next chillers (Check
IOM for proper installation).
One or more condenser
fan turning in wrong
direction.
Excessive charge of
refrigerant into the unit.
Mechanical high pressure switch is
damaged or not calibrated.
Check for correct phases sequence
(L1, L2, L3) in the electrical
connection of the fans.
Check liquid sub-cooling and suction
super-heat to control indirectly the
correct
charge
of
refrigerant.
If necessary recover all the refrigerant
to weight the entire charge and to
control if the value is in line with kg
indication on unit label.
Check for proper operation of the high
pressure switch.
6.1.7.4 High Discharge Temperature Alarm
This alarm indicates that the temperature at the discharge port of the compressor exceeded a
maximum limit which may cause damages to the mechanical parts of the compressor.
When this alarm occurs compressor’s crankcase and discharge pipes may become very hot. Be
careful when getting in contact with the compressor and discharge pipes in this condition.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffDischTmpHi
String in the alarm log:
 CxCmp1 OffDischTmpHi
String in the alarm snapshot
CxCmp1 OffDischTmpHi
Cause
Liquid Injection
properly.
is
not
operating
Liquid injection orifice is small.
Discharge temperature sensor could
not operate properly.
Solution
Check the electrical connection
between the controller and the liquid
injection solenoid valve.
Check that the liquid injection line is
not obstructed by observing the
discharge temperature when it is
activated.
Check if when the liquid injection
solenoid is activated the temperature
can be controlled between the limits.
Check for proper operation of the
discharge temperature
6.1.7.5 High Motor Temperature Alarm
This alarm indicates that the motor temperature has exceeded the maximum temperature limit for
safe operations.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffMotorTempHi
String in the alarm log:
 CxCmp1 OffMotorTempHi
String in the alarm snapshot
CxCmp1 OffMotorTempHi
Cause
Insufficient motor cooling
Solution
Check refrigerant charge.
Check if operational envelope of the
unit is respected.
Motor temperature sensor could not
operate properly.
Check the readings of the motor
temperature sensor and check the
Ohmic value. A correct reading
should be around hundreds of Ohm at
ambient temperature.
Check the electrical connection of the
sensor with the electronic board.
Operation Manual
74
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
6.1.7.6 High Oil Pressure Differential Alarm
This alarm indicates that the oil filter is clogged and needs to be replaced.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffOilPrDiffHi
String in the alarm log:
 CxCmp1 OffOilPrDiffHi
String in the alarm snapshot
CxCmp1 OffOilPrDiffHi
Cause
Oil filter is clogged
Solution
Replace oil filter.
6.1.7.7 Fail Start Low Pressure
This alarm indicates that at the compressor start the evaporating pressure is under a minimum limit
for too much time.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffStartFailEvpPrLo
String in the alarm log:
 Cx OffStartFailEvpPrLo
String in the alarm snapshot
Cx OffStartFailEvpPrLo
Cause
Ambient temperature is too low
Solution
Check the operating envelope for this
machine.
6.1.7.8 No Pressure At Start Alarm
This alarm is used to indicate a condition where the pressure at the evaporator or at the condenser
is lower than 35kPa, so the circuit is potentially empty of refrigerant.
Symptom
Circuit status is Off.
The compressor does not start
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffNoPressAtStart
String in the alarm log:
 Cx OffNoPressAtStart
String in the alarm snapshot
Cx OffNoPressAtStart
Cause
Evaporator or condenser pressure are
below 35kPa
Solution
Check transducers calibration with an
appropriate gauge.
Check transducers cabling and
readout.
Check refrigerant charge and set it to
the proper value.
6.1.7.9 Maximum Number of Restart Alarm
This alarm indicates that for three consecutive times after the compressor start the evaporating
pressure is under a minimum limit for too much time
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffNbrRestarts
String in the alarm log:
 Cx OffNbrRestarts
String in the alarm snapshot
Cause
Ambient temperature is too low
Solution
Check the operating envelope for this
machine.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
75
OPERATION
MANUAL
Air cooled inverter water chiller
Cx OffNbrRestarts
6.1.7.10 No Pressure Change At Start Alarm
This alarm indicates that the compressor is not able to start or to create a certain minimum
variation of the evaporating or condensing pressures after start.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffNoPressChgStart
String in the alarm log:
 Cx OffNoPressChgStart
String in the alarm snapshot
Cx OffNoPressChgStart
Cause
Compressor cannot start
Compressor
direction.
is
turning
Solution
Check if the start signal is properly
connected to the inverter.
in
wrong
Refrigerant circuit is empty of
refrigerant.
Not proper operation of evaporating
or condensing pressure transducers.
Check correct phases sequence to
the compressor (L1, L2, L3) according
to the electrical scheme.
Inverter is not properly programmed
with the right direction of rotation
Check circuit pressure and presence
of refrigerant.
Check
proper
operation
of
evaporating or condensing pressure
transducers.
6.1.7.11 Evaporating Pressure sensor fault
This alarm indicates that the evaporating pressure transducer is not operating properly.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 EvapPressSen
String in the alarm log:
 CxCmp1 EvapPressSen
String in the alarm snapshot
CxCmp1 EvapPressSen
Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about mVolt
(mV) range related to pressure values
in kPa.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe. The
transducer must be able to sense the
pressure through the valve’s needle.
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.7.12 Condensing Pressure sensor fault
This alarm indicates that the condensing pressure transducer is not operating properly.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 CondPressSen
String in the alarm log:
 CxCmp1 CondPressSen
String in the alarm snapshot
CxCmp1 CondPressSen
Cause
Sensor is broken.
Sensor is shorted.
Sensor is not properly connected
(open).
Solution
Check for sensor integrity.
Check correct sensors operation
according information about mVolt
(mV) range related to pressure values
in kPa.
Check if sensor is shorted with a
resistance measurement.
Check for correct installation of the
sensor on refrigerant circuit pipe. The
transducer must be able to sense the
pressure through the valve’s needle.
Operation Manual
76
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
Check for absence of water or
humidity on sensor electrical contacts.
Check for correct plug-in of the
electrical connectors.
Check for correct sensors wiring also
according electrical scheme.
6.1.7.13 High Motor Current Alarm
This alarm indicates that the compressor absorbed current is exceeding a predefined limit.
Symptom
Circuit status is Off.
The compressor does not load
anymore or even unload, circuit is
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffMtrAmpsHi
String in the alarm log:
 CxCmp1 OffMtrAmpsHi
String in the alarm snapshot
CxCmp1 OffMtrAmpsHi
Cause
The ambient temperature is too high.
The wrong compressor model has
been selected.
Solution
Check the unit selection to see if the
unit can operate at full load.
Check if all fans are operating
properly and are able to keep the
condensing pressure at the proper
level.
Clean condenser coils to allow a
lower condensing pressure.
Check the compressor model for this
unit.
6.1.7.14 Low Pressure Ratio Alarm
This alarm indicates that the ratio between evaporating and condensing pressure is below a limit
which depends on compressor speed and guarantees the proper lubrication to compressor.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffPrRatioLo
String in the alarm log:
 CxCmp1 OffPrRatioLo
String in the alarm snapshot
CxCmp1 OffPrRatioLo
Cause
Compressor is not able to develop the
minimum compression.
Solution
Check fan setpoint and settings, it
could be too low.
Check compressor absorbed current
and
discharge
superheat.
Compressor can be damaged.
Check the correct operation of suction
/ delivery pressure sensors.
Check the internal relief valve didn’t
opened during previous operation
(check the unit history).
Note:If the difference between delivery and
suction pressure exceed 22bar, the
internal relief valve open and need to
be replaced.
Inspect the gate rotors / screw rotor
for possible damages.
6.1.7.15 Overvoltage Alarm
This alarm indicates that chiller supply voltage exceeded the maximum limit which allows proper
operations of the components. This is estimated looking at the DC voltage on the inverter which
depends of course from the main power.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons. In case of doubts contact your maintenance company.
Symptom
Cause
Solution
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
77
Air cooled inverter water chiller
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffOverVoltage
String in the alarm log:
 Cx OffOverVoltage
String in the alarm snapshot
Cx OffOverVoltage
OPERATION
MANUAL
Chiller main power supply had an up
peak which caused the trip.
Check if main power supply is within
the acceptable tolerance for this
chiller
Main power supply setting on the
Microtech III is not suitable with the
power supply in use.
Measure the power supply to the
chiller and select the proper value on
the Microtech III HMI.
6.1.7.16 Undervoltage Alarm
This alarm indicates that chiller supply voltage exceeded the minimum limit which allows proper
operations of the components.
Resolution of this fault requires a direct intervention on the power supply of this unit.
Direct intervention on the power supply can cause electrocution, burns or even death. This action
must be performed only by trained persons. In case of doubts contact your maintenance company.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffUnderVoltage
String in the alarm log:
 Cx OffUnderVoltage
String in the alarm snapshot
Cx OffUnderVoltage
Cause
Chiller main power supply had a down
peak which caused the trip.
Solution
Check if main power supply is within
the acceptable tolerance for this
chiller
Main power supply setting on the
Microtech III is not suitable with the
power supply in use.
Measure the power supply to the
chiller and select the proper value on
the Microtech III HMI.
6.1.7.17 Compressor VFD OverTemp
This alarm indicates that the Inverter temperature has exceeded a safety limits and the inverter has
to be stopped in order to avoid damages to components.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffVfdOverTemp
String in the alarm log:
 CxCmp1 OffVfdOverTemp
String in the alarm snapshot
CxCmp1 OffVfdOverTemp
Cause
Insufficient motor cooling
Motor temperature sensor could not
operate properly.
Solution
Check refrigerant charge.
Check if operational envelope of the
unit is respected.
Check operation of the cooling
solenoid valve
Check the readings of the motor
temperature sensor and check the
Ohmic value. A correct reading
should be around hundreds of Ohm at
ambient temperature.
Check the electrical connection of the
sensor with the electronic board.
6.1.7.18 VFD Over Current
This alarm indicates that the Inverter current has exceeded a safety limits and the inverter has to
be stopped in order to avoid damages to components.
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cause
The ambient temperature is too high.
Solution
Check the unit selection to see if the
unit can operate at full load.
Check if all fans are operating
properly and are able to keep the
condensing pressure at the proper
Operation Manual
78
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
OPERATION
MANUAL
Air cooled inverter water chiller
CxCmp1 OffVfdOverCurr
String in the alarm log:
 CxCmp1 OffVfdOverCurr
String in the alarm snapshot
CxCmp1 OffVfdOverCurr
level.
Clean condenser coils to allow a lower
condensing pressure.
6.1.7.19 VFD Communication Failure
This alarm indicates a communication problem with the inverter.
Symptom
Circuit status is Off.
The compressor does not load
anymore, circuit is immediately
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffVfdCommFail
String in the alarm log:
 CxCmp1 OffVfdCommFail
String in the alarm snapshot
CxCmp1 OffVfdCommFail
Cause
RS485 network is not properly cabled.
Modbus communication is not running
properly.
Modbus interface card can be faulty
Solution
Check the continuity of the RS485
network with the unit off. There should
be continuity from the main controller
to the last inverter as indicated on the
wiring diagram.
Check inverter addresses and
addresses of all the additional devices
in the RS485 network (for example
the energy meter). All the addresses
must be different.
Check with your service organization
to evaluate this possibility and
eventually replace the board.
6.1.7.20 Compressor VFD Fault
This alarm indicates an abnormal condition that forced the inverter to stop.
Symptom
Circuit status is Off.
The compressor does not load
anymore, circuit is immediately
stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
CxCmp1 OffVfdFault
String in the alarm log:
 CxCmp1 OffVfdFault
String in the alarm snapshot
CxCmp1 OffVfdFault
Cause
Inverter is operating in an unsafe
condition and for this reason the
inverter must be stopped.
Solution
Check the alarm snapshot to identify
the alarm code from the inverter.
Contact your service organization to
get the problem solved.
6.1.7.21 EXV Driver Error
This alarm indicates an abnormal condition of the EXV Driver.
Symptom
Circuit status is Off.
Circuit is immediately stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffEXVDrvError
String in the alarm log:
 Cx OffEXVDrvError
String in the alarm snapshot
Cx OffEXVDrvError
Cause
Hardware Error
Solution
Contact your service organization to
get the problem solved.
6.1.7.22 Economizer EXV Driver Error
This alarm indicates an abnormal condition of the Economizer EXV Driver.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
79
OPERATION
MANUAL
Air cooled inverter water chiller
Symptom
Circuit is stopped if the discharge
temperature reach the high limit
value.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx EcoEXVDrvError
String in the alarm log:
 Cx OffEcoEXVDrvError
String in the alarm snapshot
Cx OffEcoEXVDrvError
Cause
Hardware Error
Solution
Contact your service organization to
get the problem solved.
6.1.7.23 EXV Motor Not Connected
This alarm indicates an abnormal condition of the EXV Driver.
Symptom
Circuit status is Off.
Circuit is immediately stopped.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx OffEXVMotor
String in the alarm log:
 Cx OffEXVMotor
String in the alarm snapshot
Cx OffEXVMotor
Cause
Valve not connected.
Solution
Referring to the wiring diagram check
if the valve is correctly connected to
the module.
6.1.7.24 Economizer EXV Motor Not Connected
This alarm indicates an abnormal condition of the Economizer EXV Driver.
Symptom
Circuit is stopped if the discharge
temperature reach the high limit
value.
Bell icon is moving on controller’s
display.
String in the alarm list:
Cx EcoEXVMotor
String in the alarm log:
 Cx EcoEXVMotor
String in the alarm snapshot
Cx EcoEXVMotor
Cause
Valve not connected.
Solution
Referring to the wiring diagram check
if the valve is correctly connected to
the module.
Operation Manual
80
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
7 Options
7.1 Total Heat Recovery (Optional)
This chiller can handle a total heat recovery option. This feature will require an additional module
and sensors to read the entering and leaving heat recovery water temperatures, command a heat
recovery water pump.
The heat recovery is enabled through the Q8 switch installed on the unit and requires to adjust
settings on the unit controller in order to make it work as needed. First of all the function needs to
be enabled on the main controller in order to display all the settings related to this function. With
reference to section 4.3.5 the heat recovery enable setpoint has to be chanded to Enable.
Setpoint/Sub-Menu
Apply Changes=
C1 # Of Fans=
Heat Recovery=
Default
No
6
Enable
Range
Description
No, Yes
Number of fans available.
Disable, Enable
When this is done the controller will need to be reset by applying the changes.
After the reboot all the heat recovery data and settings will be displayed on the HMI. In the
View/Set Unit – Temperatures the heat recovery entering and leaving water temperatures will be
then visible.
HR LWT=
HR EWT=
-273.1°C
-273.1°C
Heat Recovery Leaving Water Temperature (displayed only if Heat Recovery set on)
Heat Recovery Entering Water Temperature (displayed only if Heat Recovery set on)
Additionally the Heat Recovery setpoint and differential will become visible and can be adjusted as
needed:
Setpoint/Sub-Menu
HR EWT Stp
HR EWT Dif
Default
40.0°C
2.0°C
Range
30.0…50.0°C
1.0…10.0°C
Description
Heat Recovery Entering Water Setpoint
Heat Recovery Water Temperature differential
7.2 Energy Meter including Current Limit (Optional)
An energy meter can be optionally installed on the unit. The energy meter is connected through
Modbus to the unit controller, which can display all relevant electrical data such as:





Line to Line Voltage (per phase and average)
Line Current (per phase and average)
Active Power
Cos Phi
Active Energy
More details are described in chapter 4.2.10. All these data can be also accessed from a BMS by
connecting it to a communication module. See the communication module manual for details on
the device and parameter settings.
Both the energy meter device and the unit controller need to be properly set. The instructions
below detail how to set the energy meter. Refer to the specific instructions of the energy meter for
more detail on the operation of the device.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
81
OPERATION
MANUAL
Air cooled inverter water chiller
Energy Meter Settings (Nemo D4-L / Nemo D4-Le)
Password (Down+Enter)
1000
Connection
3-2E
three phase Aron System
Address
020
Baud
19.2
kbps
Par
None
parity bit
Time Out
3
sec
Password 2
CT ratio
VT ratio
2001
see CT label current transformer ratio (i.e if CT is 600:5, set to 120)
1
no voltage transformers (unless 690V chiller)
Once the energy meter has been configured, do the following steps in the unit controller:


From Main Menu, go to View/Set Unit  Commission Unit  Configuration  Unit
Set Energy Mtr = Nemo D4-L or Nemo D4-Le
The energy meter option integrates the current limit function, which allows the unit to limit its
capacity in order not to exceed a pre-defined current setpoint. This setpoint can be set in the unit
display or can be changed from an external 4-20 mA signal.
The current limit must be set according to the following instructions:

From Main Menu, go to View/Set Unit  Power Conservation
The following settings related to current limit option are available into the menu:
Unit Current
Current Limit
Current Lim Sp
Displays the unit current
Displays the active current limit (which can be given by an external signal if unit is in network mode)
Set the current limit setpoint (if unit is in local mode)
7.3 Rapid Restart (Optional)
This chiller can activate a Rapid Restart (optional) sequence in reaction to a power failure. A digital
contact is used to inform the controller that the feature is enabled. The feature will be configured in
the factory.
Rapid restart is activated under the following conditions:





The power failure exists for up to 180 seconds
The unit and circuit switches are ON.
No unit or circuit alarms exist.
The unit has been running in the normal Run state
The BMS Circuit Mode setpoint is set to Auto when the control source is Network
If the power failure is more than 180 seconds, the unit will start based on the setting of the Stop-toStart cycle timer (minimum setting of 3 minutes) and load per standard unit without Rapid Restart.
When Rapid Restart is active, the unit will restart within 30 seconds of power restoration. The time
to restore full load is less than 6 minutes.
Operation Manual
82
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
Air cooled inverter water chiller
OPERATION
MANUAL
7.4 Inverter Pump Kit (Optional)
The inverter pump kit includes one or two centrifugal pumps, each one driven by an inverter.
Pumps can be driven with a customer supplied or with a factory wired speed reference. In this
latter case, a fixed flow control or a variable flow control can be set. In any case, the pump inverter
needs to be loaded with the appropriate set of parameters (see table below). A detailed description
of the operator panel and inverter parameters is given in the inverter instruction manual included in
the documentation of the unit.
Operation Manual
EWAD TZ B 160-700
Air cooled inverter water chiller
D-EOMAC00909-16EN
83
The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A..
Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge. No express or implied warranty is
given for the completeness, accuracy, reliability or fitness for particular purpose of its content, and the products and services presented
therein. Specification are subject to change without prior notice. Refer to the data communicated at the time of the order. Daikin Applied
Europe S.p.A. explicitly rejects any liability for any direct or indirect damage, in the broadest sense, arising from or related to the use
and/or interpretation of this publication. All content is copyrighted by Daikin Applied Europe S.p.A..
DAIKIN APPLIED EUROPE S.p.A.
Via Piani di Santa Maria, 72 - 00040 Ariccia (Roma) - Italia
Tel: (+39) 06 93 73 11 - Fax: (+39) 06 93 74 014
http://www.daikinapplied.eu
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising