Carrier PRO-DIALOG Plus 30GK Series Specifications

30GX and 30HXC series
PRO-DIALOG
Control
Screw-Compressor Air- and
Water-Cooled Liquid Chillers
50 Hz
GLOBAL CHILLER
PRO-DIALOG
O-DIALOG
kPa
kPa
A
A
B
kPa
B
MENU
kPa
kPa
kPa
kPa
A
A
B
kPa
B
MENU
kPa
kPa
Installation, operation and maintenance instructions
Table of contents
1 - SAFETY CONSIDERATIONS ........................................................................................................................................... 4
1.1 - General ........................................................................................................................................................................... 4
1.2 - Avoiding electrocution .................................................................................................................................................. 4
2 - GENERAL DESCRIPTION ................................................................................................................................................ 4
2.1 - General ............................................................................................................................................................................ 4
2.2 - Abbreviations used .......................................................................................................................................................... 4
3 - HARDWARE DESCRIPTION .......................................................................................................................................... 5
3.1 - General ........................................................................................................................................................................... 5
3.2 - Electronic boards ............................................................................................................................................................ 5
3.2.1 - The basic board ........................................................................................................................................................ 5
3.2.2 - Slave boards ............................................................................................................................................................. 5
3.2.3 - The user interface ..................................................................................................................................................... 6
3.2.4 - Connections between boards ................................................................................................................................... 6
3.2.5 - Slave board address ................................................................................................................................................. 6
3.2.6 - Power supply to the boards ...................................................................................................................................... 6
3.2.7 - Light emitting diodes on boards
3.3 - The controls .................................................................................................................................................................... 7
3.3.1 - Electronic expansion valve EXV ............................................................................................................................. 7
3.3.2 - The head pressure controls ...................................................................................................................................... 7
3.3.3 - The evaporator pump ............................................................................................................................................... 7
3.3.4 - The condenser pump ................................................................................................................................................ 7
3.3.5 - The evaporator heater .............................................................................................................................................. 7
3.3.6 - Pressure sensors ....................................................................................................................................................... 7
3.3.7 - Thermistors .............................................................................................................................................................. 8
3.4 - Connections at customer’s terminal block ..................................................................................................................... 8
3.4.1 - Fault reporting on circuits A and B ......................................................................................................................... 8
3.4.2 - Evaporator pump contactor control ......................................................................................................................... 8
3.4.3 - Condenser pump contactor control .......................................................................................................................... 8
3.4.4 - Evaporator heater contactor control ......................................................................................................................... 9
3.4.5 - Remote start/stop volt-free contact .......................................................................................................................... 9
3.4.6 - Remote volt-free contact for cooling temperature setpoint selection ...................................................................... 9
3.4.7 - Remote heat/cool volt-free contact .......................................................................................................................... 9
3.4.8 - Remote heat reclaim volt-free contact ..................................................................................................................... 9
3.4.9 - Demand limit volt-free contact ................................................................................................................................ 9
3.4.10 - Evaporator water loop control and condenser water flow or thermostat box control volt-free contacts ............... 9
3.4.11 - 0-10 V d.c. input for setpoint reeset or demand limit .......................................................................................... 10
3.4.12 - Condenser water valve control contacts .............................................................................................................. 10
3.4.13 - 24 V a.c. contact .................................................................................................................................................. 10
3.4.14 - Connections to the CCN ...................................................................................................................................... 10
3.4.15 - Heat reclaim condenser water valve connection .................................................................................................. 10
4 - SETTING UP PRO-DIALOG PLUS CONTROL .......................................................................................................... 11
4.1 - General ......................................................................................................................................................................... 11
4.2 - Main interface ............................................................................................................................................................... 11
4.2.1 - Description ............................................................................................................................................................. 11
4.2.2 - Operating types ...................................................................................................................................................... 11
4.2.3 - Displaying/modifying a menu item ....................................................................................................................... 12
4.2.4 - Description of the INFORMATION menu ............................................................................................................ 15
4.2.5 - Description of the TEMPERATURES menu ........................................................................................................ 17
4.2.6 - Description of the PRESSURE menu .................................................................................................................... 17
4.2.7 - SETPOINT menu ................................................................................................................................................... 18
4.2.8 - Description of the INPUT menu ............................................................................................................................ 21
4.2.9 - Description of the OUTPUT/TEST menu ............................................................................................................. 23
The cover photograph is solely for illustration, and forms no part of any offer for sale or any sale contract. The manufacturer
reserves the right to change the design at any time without notice.
2
4.2.10 - Description of the CONFIGURATION menu ..................................................................................................... 24
4.2.11 - Description of the ALARMS menu ..................................................................................................................... 25
4.2.12 - Description of the ALARMS HISTORY menu ................................................................................................... 26
4.2.13 - Description of the OPERATING LOG menu ...................................................................................................... 26
4.2.14 - Default user interface display .............................................................................................................................. 26
4.3 - Summary interface ........................................................................................................................................................ 27
4.3.1 - General ................................................................................................................................................................... 27
4.3.2 - Description of the LEDs ........................................................................................................................................ 27
4.3.3 - The push buttons .................................................................................................................................................... 27
5 - PRO-DIALOG PLUS CONTROL OPERATION .......................................................................................................... 28
5.1 - Start/stop control .......................................................................................................................................................... 28
5.2 - Heating/cooling selection ............................................................................................................................................. 28
5.3 - Evaporator water pump control .................................................................................................................................... 28
5.4 - Condenser water pump control ..................................................................................................................................... 28
5.5 - Control point ................................................................................................................................................................. 28
5.5.1 - Active setpoint ....................................................................................................................................................... 28
5.5.2 - Reset ....................................................................................................................................................................... 28
5.6 - Demand limit ................................................................................................................................................................ 28
5.7 - Capacity control ........................................................................................................................................................... 29
5.8 - Determining the lead circuit ......................................................................................................................................... 29
5.9 - Circuit loading sequence .............................................................................................................................................. 29
5.10 - Compressor start-up sequence in one circuit ................................................................................................................ 29
5.11 - Controlling the EXV ..................................................................................................................................................... 29
5.12 - Motor cooling valve control ......................................................................................................................................... 30
5.13 - Head pressure control on air-cooled units .................................................................................................................... 30
5.14 - Head pressure control on water-cooled units ............................................................................................................... 30
5.15 - Head pressure setpoint selection .................................................................................................................................. 30
5.16 - High pressure load shedding function .......................................................................................................................... 30
5.17 - Start-up procedure - prelubrication .............................................................................................................................. 30
5.18 - Master/slave assembly .................................................................................................................................................. 30
5.18.1 - General ................................................................................................................................................................. 30
5.18.2 - Balancing running times between master and slave ............................................................................................ 31
5.18.3 - Staring the follower unit ...................................................................................................................................... 31
5.18.4 - Abnormal operating conditions ........................................................................................................................... 31
5.19 - Controlling a Pro-Dialog unit with a System Manager ................................................................................................ 31
5.20 - Optional heat reclaim module ...................................................................................................................................... 31
6 - DIAGNOSTICS - TROUBLESHOOTING ..................................................................................................................... 32
6.1 - General ......................................................................................................................................................................... 32
6.2 - Displaying alarms ......................................................................................................................................................... 32
6.3 - Resetting alarms ........................................................................................................................................................... 32
6.4 - Description of the alarm codes ..................................................................................................................................... 32
3
1 - SAFETY CONSIDERATIONS
2 - GENERAL DESCRIPTION
1.1 - General
2.1 - General
Installation, start-up and servicing of equipment can be
hazardous if factors particular to the installation are not
considered: operating pressures, electrical components,
voltages and the installation site itself (elevated plinths,
rooftops and built-up structures).
PRO-DIALOG Plus is a system for controlling units which use
screw compressors:
•
Single or dual circuit
•
Air or water-cooled condensers
•
Non-reversible heat pumps
Only highly trained and qualified installation engineers and
technicians, who are fully trained on the product, are
authorised to install and start up this equipment.
PRO-DIALOG Plus controls compressor start-up and demand
limits needed to maintain the desired leaving temperature
setpoint for water. It automatically sets the position of the
electronic expansion valve (if used) to optimise the evaporator
charge. It controls operation of the fans (on air-cooled units) or
water valves (on water-cooled units) to maintain the correct
head pressure in each circuit.
During all servicing operations, it is important to read,
understand and follow all the recommendations and
instructions given in the installation and service instructions for
the product, including the tags and labels affixed to the
equipment, components and any parts supplied separately, and
to comply with all other relevant safety regulations.
•
•
•
Apply all 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 - Avoiding electrocution
Only personnel qualified in accordance with the recommendations of the IEC (International Electrotechnical Commission)
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 the main
power supply at the main circuit breaker or isolator.
IMPORTANT:
Risk of electrocution: Even when the main power isolator or
circuit breaker is off, it is still possible for certain components
such as crankcase heaters and trace heaters to be energised,
since they are connected to a separate power source.
Safety circuits are constantly monitored by PRO-DIALOG
Plus to ensure safe operation of the unit. PRO-DIALOG Plus
also gives access to a Quick Test program covering all inputs
and outputs.
All PRO-DIALOG Plus 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, analogue signals).
•
CCN mode: the machine is controlled by commands from
the Carrier Comfort Network (CCN). In this case a data
communication cable is used to connect the unit to the
CCN communication bus.
The operating mode must be chosen with the Operating Type
selection button described in section 4.2.2.
When the PRO-DIALOG Plus 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 CCN network.
2.2 - Abbreviations used
Risk of burns: Electrical currents cause components to get hot
either temporarily or permanently. Handle power cables,
electrical cables and conduits, terminal box covers and motor
frames with very great care.
IMPORTANT: This equipment uses and emits electromagnetic
signals. If it is not installed and used in accordance with the
instructions given here, it may cause radio interference. It has
been tested and shown to comply with all applicable codes
regarding electromagnetic compatibility.
4
In this manual the circuits are called circuit A and circuit B.
The compressors in circuit A are labelled A1 and A2. Those in
circuit B are labelled B1 and B2.
The following abbreviations are frequently used:
AI - Analogue Input
AO - Analogue Output
CCn - Operating type: CCN
CCN - Carrier Comfort Network
CPM - Compressor Protection Module
DI - Discrete Input
DO - Discrete Output
EXV - Electronic eXpansion Valve
L-C1 - Operating type: Local cooling - setpoint 1
L-C2 - Operating type: Local cooling - setpoint 2
L-H - Operating type: Local heating
LC1r - Operating type: Local cooling - setpoint 1 - heat
reclaim
LC2r - Operating type: Local cooling - setpoint 2 - heat
reclaim
LED Loader LOFF rEM SCT SIO
SST
TXV
Light Emitting Diode
Compressor capacity step
Operating type: Local off
Operating type: by remote control contacts
Saturated disCharge Temperature
Standard Input/Output - internal communication bus
linking the basic board to the slave boards
- Saturated Suction Temperature
- Thermal eXpansion Valve
3 - HARDWARE DESCRIPTION
The control system consists of at least a basic board and a user
interface with, depending on the application, one or more slave
boards such as compressor boards, 4xDO boards or 4xAI2xAO boards. If used, slave boards are connected to the basic
board via an internal communication bus (SIO).
The various control components are arranged in modules
within the control cabinet:
•
•
3.2.1 - The basic board
This board can be used alone or in conjunction with slave boards.
It holds the program that controls the machine. It continuously
manages the information coming in from the various pressure
and temperature sensors, and communicates with the slave
boards via the SIO bus. It can also communicate with elements
of the Carrier Comfort Network via the CCN bus.
When “conF” shows on the user interface, this means that the
basic board must be configured. This can only be done by
Carrier Service.
3.1 - General
•
3.2 - Electronic boards
Control module: This comprises the basic board, the
user interface, the EXV control boards (if available) and
option boards, as well as the customer’s terminal block.
Start-up module: This consists of the start-up boards,
compressor protection boards, as well as the compressor
circuit breakers and contactors.
Fan module (air-cooled unit): Consists of one or two
4xDO boards together with the fan circuit breakers and
contactors.
Power interrupt detection: The ACF contacts on J6 detect any
interruption or dropout in the power supply. If the contact
opens, the unit is immediately shut down and the basic board is
re-initialised. This contact must therefore be normally closed
when the power to the controller is switched on. After a power
dropout, the unit restarts automatically without the need for an
external command.
3.2.2 - Slave boards
•
Compressor board CPM: This board is used to control a
compressor. Up to four compressor boards can be
connected to the basic board.
•
4xDO board: This board can be used to control one EXV
(with the aid of an additional interface card), various fan
stages, loaders, oil pumps or additional motor cooling
valves.
•
4xAI-2xAO board: This board can be used to read
sensors (oil pressure, economizer pressure, condensing
temperature or reclaim temperature), or to control variable
speed fans (air-cooled units) or the condenser valve (watercooled units).
Control box
Fan start-up module
CCN network connector
Control
module
Power supply
disconnect switch
Compressor
start-up module
Customer control
terminal block
5
3.2.3 - The user interface
The user interface is in two parts:
•
The main interface: This gives access to all of the
control parameters for the unit. It consists of a 2-digit
primary display block and a secondary 4-digit display
block with 10 LEDs and 5 buttons.
•
The summary interface: This gives quick access to just
the main control parameters for the unit. It comprises 12
buttons and 16 LEDs, and includes a schematic diagram
of the unit.
3.2.4 - Connections between boards
The basic board and slave boards communicate with each other
over an internal three-wire RS485 communication bus (SIO
bus). These three wires link all the boards in parallel.
Terminals 1, 2 and 3 on connector J4 of the basic board are
linked to terminals 1, 2 and 3 of connector J3 (except for CPM
boards where terminals 2 and 3 are reversed). Incorrect
connection will render the system inoperative.
Slave board addresses
BOARD
DIP SWITCH (0 = open)
1
2
3
4
5
6
7
8
Board 4xDO #1 EXV circuit A
0
1
0
0
0
0
1
0
Board 4xDO #2 EXV circuit B
0
1
1
0
0
0
1
0
Board 4xDO #3 (fan module) #1
0
0
1
1
1
0
1
0
Board 4xDO #4 (fan module) #2
0
0
0
0
0
1
1
0
Board 4xDO #5 outputs compressor A1
0
0
1
0
0
1
1
0
Board 4xDO #6 outputs compressor A2
0
0
0
1
0
1
1
0
Board 4xDO #7 outputs compressor B1
0
0
1
1
0
1
1
0
Board 4xDO #8 outputs compressor B2
0
0
0
0
1
1
1
0
Board 4 x DO #9 heat reclaim module
0
0
1
0
1
1
1
0
Board 4xAI-2xAO #1
0
1
0
1
0
0
1
0
Board 4xAI-2xAO #2
0
0
0
0
1
0
1
0
Board 4xAI-2xAO #3
0
1
1
0
1
0
1
0
Blue address switch, CPM board (marked ADDRESS)
Fig. 1 - Internal bus wiring (between boards)
BOARD
DIP SWITCH (0 = open)
5
4
3
2
CPM #1 (compressor A 1)
1
0
0
1
CPM #2 (compressor A 2)
1
1
0
1
CPM #3 (compressor B 1)
1
0
1
1
CPM #4 (compressor B 2)
1
1
1
1
3.2.6 - Power supply to the boards
CPM
Compressor
board
Basic
board
4xDO
board
4AI-2AO
board
3.2.5 - Slave board addresses
Every slave board (compressor board, 4xDO or 4xAI-2xAO
board) has an address which must be set up using the red SIO
address switch (marked SIO ADDRESS) at the top righthand
corner of each board. This switch consists of 8 DIP switches
(except for the CPM boards, equipped with four blue DIP
switches). The switch is disabled when it is in the OPEN
position - (for CPM boards refer to the text engraved on the
printed circuit board).
NOTE: Any incorrect address will prevent the unit from
starting. Turn off the power before amending the address of
any auxiliary board.
Fig. 2 - Address switch - marked “SIO ADDRESS”
1
2
3
4
5
OPEN
6
7
8
The basic board, the summary interface and the accessory
CCN/JBUS board are supplied from a 24 V a.c. floating
supply. The other boards are supplied by sources that are
referred to earth.
BOARDS
CONNECTOR/
TERMINAL
Basic board
J5/ O11-O12
011-012
Summary interface
J3
011-012
CCN/JBUS accessory
24 V a.c.
011-012
4xDO for A1
J1/011-012
11-1 - (12-1*)
CPM A1
PL-2/5 - 1
11-1 - (12-1*)
4xDO for A2
J1/011-012
11-2 - (12-2*)
CPM A2
PL-2/5 - 1
11-2 - (12-2*)
4xDO for B1
J1/011-012
11-3 - (12-3*)
CPM B1
PL-2/5 - 1
11-3 - (12-3*)
4xDO for B2
J1/011-012
11-4 - (12-4*)
CPM B2
PL-2/5 - 1
11-4 - (12-4*)
EXV Board
J1/011-012
11 - 12
Board 4AI - 2xAO
J1/011-012
11 - 12
Board 4xDO fan module #1
J1/011-012
11-11 - (12-11*)
Board 4xDO fan module #2
J1/011-012
12-11 - (12-31*)
Compressor module A1
Compressor module A2
Compressor module B1
Compressor module B2
* referred to earth
6
SUPPLY
24 V a.c./WIRES
NOTE: When connecting the power supply for the boards,
maintain polarity.
In the event of a power supply interrupt, the unit restarts
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.
3.2.7 - Light emitting diodes on boards
All boards continuously check and indicate the proper
operation of their electronic circuits. A light emitting diode
(LED) lights on each board when it is operating properly.
MAIN red LED - basic and slave boards
•
•
•
•
The MAIN red LED flashes at about 2 second intervals to
show that the module is working properly.
If this LED is permanently unlit, the power supply must
be checked.
On slave boards, if this LED is permanently lit there is a
problem requiring the board to be changed.
On the basic board, if this red LED is permanently lit or
flashes in turns strongly then weakly, there is either a
faulty basic board or a poorly positioned EPROM.
SIO green LED - basic and slave boards
(item SIO on the board)
•
•
•
This LED flashes continuously to show that the board is
communicating correctly over its internal bus.
If this LED is not flashing, check the wiring of the SIO
bus and the address of the board (slave board only). If the
basic board is not linked to any slave boards, this LED
should not flash.
If all slave boards indicate a communication fault, check
the SIO bus connection on the basic board. If this
connection is correct and the fault persists, replace the
basic board.
CCN green LED - basic board
(item CCN on the board)
•
This LED flashes to show that the basic board is
communicating over its CCN bus.
3.3 - The controls
3.3.1 - Electronic expansion valve (EXV)
The EXV is used to adjust the refrigerant flow to changes in
the operating conditions of the machine. For this purpose, a
series of calibrated orifices are machined into the wall of the
refrigerant inlet port. As the refrigerant passes through these
orifices, it expands and becomes a bi-phase mixture (liquid and
gas).
To adjust the refrigerant flow to changes in operating
conditions, a piston moves constantly up or down to vary the
cross-section of the refrigerant path. This piston is driven by an
electronically controlled linear stepper motor. The high degree
of accuracy with which the piston is positioned ensures that the
flow of refrigerant is precisely controlled.
NOTE: The external connector of the EXV must be cleaned and
coated with silicone grease (Part No. 397 EE) to keep out
condensation and prevent corrosion.
3.3.2 - The head pressure controls
The controller can deal with the following:
•
in the case of air-cooled units, for each circuit, fan stages
together with, if necessary, a variable speed fan (controlled
by an 4xAI-2xAO board)
•
in the case of water-cooled units, a water valve. This valve
is controlled by an 4xAI-2xAO board which can deliver a
0-10 V d.c. or 4-20 mA signal, depending on the
configuration.
3.3.3 - The evaporator pump
In appropriate cases the controller can also regulate an
evaporator pump. This facility does not require an additional
board.
3.3.4 - The condenser pump
In appropriate cases the controller can also regulate a
condenser pump (for water-cooled units). This control does not
require an additional board.
3.3.5 - The evaporator heater
The evaporator heater can be regulated by the unit control on
air-cooled units to protect the evaporator against frost. This
control does not require an additional board. If this control is
used, evaporator pump control must also be via the unit
control.
3.3.6 - Pressure sensors
These are used to measure the following pressures in each
circuit:
•
Discharge gas pressure
•
Suction pressure
•
Oil pressure
•
Economizer pressure
These electronic sensors deliver 0 to 5 V d.c. to either the basic
board or a 4xAI-2xAO slave board. Two types of sensors are
used. One is calibrated for the high pressure side and oil
pressure and the other for the low pressure side and economizer
pressure.
Discharge pressure sensors
These are on the high pressure side of the lead compressor in
each circuit. They replace the usual discharge gas pressure
gauges and are used as appropriate to control head pressure or
by the high pressure load shedding option.
Oil pressure sensors
These sensors, located at the oil pressure port of each
compressor, measure the oil pressure to the compressors. The
economizer pressure is subtracted from this value to arrive at
the differential oil pressure.
Suction pressure sensors
These are used to measure the low pressure side of each circuit.
They are located in the high pressure side of the evaporator.
7
Economizer pressure sensors
These sensors are used to measure the intermediate pressure
between high and low pressure. They are used to control the oil
pressure differential. They are located on the suction line of the
economiser circuit (for units equipped with economizers) or on
the cooling line of each motor.
3.4 - Connections at customer’s terminal block
3.3.7 - Thermistors
These all have similar characteristics.
NOTE: The bridge between terminals 32, 63 and 65 on the
customer’s terminal block must not be removed.
Evaporator entering and leaving water temperature sensor
The evaporator entering water temperature sensor and the
leaving water temperature sensor are installed in the entering
and leaving side water box.
3.4.1 - Fault reporting on circuits A and B
These are live contacts. They must be supplied with 24 V a.c.
and maximum current 0.5 A*.
The connections below are available at the customer’s terminal
block. Some of them can only be used in special operating
modes. For further details see the sections that describe the
functions (section 5) and the configurations (section 4.2.10).
Fig. 3 - Fault report alarm connections
Discharge gas sensor
This sensor is used to measure the discharge gas temperature,
and permits control of the discharge temperature superheat. It
is located in the discharge line of each circuit (oiler entering or
leaving line, depending on the model).
24 V a.c. supply
24 V a.c. supply
Alarm
ALARM
ALARM
Alarm
Motor sensor
This is used to control the motor temperature of each
compressor. The terminals of this sensor are situated on the
compressor terminal board.
Evaporator liquid level sensor
This is used to measure the refrigerant charging level. It
ensures optimised flow control in the evaporator, and is
installed at the top of the evaporator.
Condenser entering and leaving water temperature sensors
These are used to control the heating capacity on heat pumps.
In cooling only units they have no control function. They are
installed in the common condenser entering and leaving line.
Heat reclaim condenser entering/leaving water
temperatures
These sensors measure the entering and leaving water
temperatures of heat reclaim condensers and are used on aircooled units. They may be fitted as options.
Temperature setpoint reset sensor
This is an optional 0-10 V sensor which can be installed
remotely from the unit. It is used to reset the cooling and
heating setpoint on the unit as a function of either the outdoor
air temperature or ambient room temperature. The sensor is not
supplied by Carrier. Its characteristics must be configured by
Carrier Service. See section 3.4.10 for connection instructions.
NOTE: To obtain a volt-free dry alarm contact, these outputs
must be interfaced with a relay supplied with 24 V a.c. (Carrier
Part No. —OK—12AC-034—EE).
3.4.2 - Evaporator pump contactor control
The evaporator pump contactor can be supplied with 24 V a.c.
and a maximum current of 0.5 A* between terminals 12 and
90.
Fig. 4 - Evaporator pump connections
Contactor
Pump
3.4.3 - Condenser pump contactor control
The condenser pump contactor can be supplied with 24 V a.c.
and a maximum current of 0.5 A* between terminals 95 and 12.
Fig. 5 - Condenser pump connections
Contactor
Pump
8
3.4.4 - Evaporator heater contactor control
The evaporator heater contactor can be supplied with 24 V a.c.
and a maximum current of 0.5 A* between terminals 41 and 12.
3.4.8 - Remote heat reclaim volt-free contact**
This control is used to select the second condensing setpoint or
the heat reclaim mode. It is only taken into account if the unit
is in remote control operating type (rEM). See section 4.2.2.
Fig. 6 - Evaporator heater connections
Connection for heat reclaim mode selection
Heat reclaim selection contact
64
63
Key:
Contact open: condensing setpoint 1 / reclaim mode not selected
Contact closed: condensing setpoint 2 / reclaim mode selected
3.4.5 - Remote stop/start volt-free contact**
The remote stop/start contact is only taken into account if the
unit is in remote control operating type (rEM). See section
4.2.2.
3.4.9 - Demand limit volt-free contact**
This contact is used to activate the demand limit function on
the unit (see sections 4.2.10, 4.2.7 and 5.6). This contact is
active whatever the operating type of the unit.
Remote stop/start connections
Connection for demand limit contact
Demand limit contact
Start/stop contact
Key:
Contact open: unit stopped
Contact closed: start command
Key:
Contact open: demand limit disabled
Contact closed: demand limit active
NOTE: In exceptional circumstances this contact can be
configured as active (configuration by Carrier Service) if the
unit operates in CCN mode as part of a master-slave link (see
section 5.18).
3.4.10 - Evaporator water loop control and condenser water
flow or thermostat box control volt-free contacts**
If these contacts open, the unit is shut down or prevented from
restarting and an alarm is raised. They are used to control
evaporator and condenser water flow on water-cooled units or
to control the thermostat box temperature on air-cooled units.
3.4.6 - Remote volt-free contact for cooling temperature
setpoint selection**
The remote contact for cooling setpoint selection is only taken
into account if the unit is in remote control operating type (rEM).
See section 4.2.2.
Evaporator water-loop control contact connection
Evaporator water loop
control contact
35
Connection for remote setpoint selection
Setpoint selection contact
The evaporator water flow control contact is factory-wired (3435). The evaporator pump must be controlled and connected
between terminals 34 and 36.
Notes:
Key:
Contact open: cooling setpoint 1
Contact closed: cooling setpoint 2
*
3.4.7 - Remote heat/cool volt-free contact**
The remote heat/cool selection contact is only taken into
account if the unit is in remote control operating type (rEM).
See section 4.2.2.
Connection for remote heat/cool selection
Each output (sections 3.4.1 to 3.4.4) can be supplied
individually at 24 V a.c. - 0.5 A maximum, provided
the total does not exceed 1 A.
** The volt-free contacts (sections 3.4.5 to 3.4.10) are
internally supplied by electric boards under 24 V a.c.
from 15 to 20 mA. The field-supplied volt-free contact
must be compatible with these electrical specifications.
Heat/cool contact
63
64
Key
Contact open: cool
Contact closed: heat
9
Condenser water flow/thermostat box control contact
connection
3.4.13 - 24 V a.c. contact
Terminals 11 and 12, located at the end of the customer terminal
block, deliver an earthed 24 V a.c. with a maximum 1 A current.
Condenser water flow/thermostat box control contact
Earthed 24 V a.c. output
Heat reclaim condenser water flow control contact
connection
Earthed 24 V a.c.
Heat reclaim condenser water flow control contact
3.4.11 - 0-10 V d.c. input for setpoint reset or demand limit
This 0-10 V d.c. input is used either to reset the setpoint or limit
demand on a unit (see configuration, section 4.2.10). This input
is active whatever the operating type of the unit. This 0-10 V
signal can be delivered by a customer-specific controller or by
a 0-10 V temperature sensor.
0-10 Volt signal connection
3.4.14 - Connection to the CCN
An RS485 bus is used for connection to the CCN. The CCN
connector is located inside the control box on the right hand
side of the customer terminal block. It is a three-pin connector:
Pin 1: signal
Pin 2: ground
Pin 3: signal
3.4.15 - Heat reclaim condenser water valve connection
This output is used on air-cooled units with the heat reclaim
option. It delivers a 4-20 mA or 0-10 V d.c. signal, depending
on the configuration (which must be carried out by Carrier
Service).
0-10 Volt signal generator
NOTE: Setpoint reset and demand limit based on an external
0-10 V d.c. signal cannot be used at the same time. Reset takes
precedence over demand limit.
NOTE: If the source of the 0-10 V d.c. signal is a temperature
sensor with a 24 V a.c. supply, it is essential to connect the
power supply for this sensor to the earthed 24 V a.c. supply
(wires 11-12) and not to the floating 24 V a.c. supply for the
basic board.
3.4.12 - Condenser water valve control contacts
This output can be used on water-cooled units that have the
condenser water valve control option installed. It delivers a
4-20 mA or 0-10 V d.c. signal, depending on the configuration
(which must be carried out by Carrier Service).
Water valve connections
1
2
3
Condenser
Signal
Fuse
10
1
2
3
Condenser
Signal
Fuse
4 - SETTING UP PRO-DIALOG PLUS CONTROL
4.2 - Main interface
4.1 - General
4.2.1 - Description
The main interface gives access to the full array of operating
parameters on the unit via 10 menus (represented by 10 icons).
Each menu contains up to 20 items (numbered from 0 to 19).
The local interface enables a number of operating parameters to
be displayed and modified.
The interface consists of two distinct parts:
The main interface (left hand section) gives access to all PRODIALOG Plus data and operating functions.
The main interface consists of 4 functional blocks which are
described below (the interface shown is for a dual-circuit aircooled unit):
The summary interface (right hand section) gives quick access
to just the main PRO-DIALOG Plus operating information.
Main interface
Block 1
Block 2
PRO-DIALOG
kPa
kPa
A
A
B
kPa
B
MENU
kPa
Block 3
kPa
Block 4
Block 1: A two-digit display showing the number of the item
selected.
Block 2: A four-digit display showing the contents of the item
selected.
Block 3: Consists of a MENU button, 10 LEDs and 10 icons
indicating the menu selected.
Block 4: Consists of three selector buttons , ,
Buttons
and are used to scroll through the numbers of the menu
items in block 2, or to increase or decrease the value of any
modifiable parameter. The
button gives access to the
modification mode, or validates a modification.
The
button is used to start/stop the chiller and modify its
operating type.
4.2.2 - Operating types
4.2.2.1 - Description
The start/stop button on the chiller can be controlled by one of
the following methods (control type):
•
Locally on the actual unit (local control type)
•
By remote control with the aid of user contacts (remote
control type)
•
By remote control with the aid of the CCN (CCN control
type).
button (called the operating
The main interface includes a
type selector button) which can be used to select one of the
above control types. In addition, when local control type is
selected, this button can be used to select an operating type for
the unit (e.g. second setpoint, cool, heat, etc.).
This combination of control types and modes that can be
selected using the
button is known as the Operating Types.
The Operating Type selector button can also be used locally to
halt the unit or to activate on of the following operating types:
11
OPERATING TYPE
Block 2 Display
Description
LOFF
Local Off: the unit is halted in local mode.
Local operation - Local On - Cooling Setpoint 1: the unit is in local
control mode and is authorised to start up in cooling mode with
setpoint 1.
L-C1
L-C2*
Local operation - Local On - Cooling Setpoint 2: the unit is in local
control mode and is authorised to start up in cooling mode with
setpoint 2. This is displayed if cooling setpoint 1 (item 0 in the
setpoint menu) has a different value from cooling setpoint 2 (item 1
in the setpoint menu).
L-H*
Local operation - Local On - Heating Setpoint: the unit is in local
control mode and is authorised to start up in heating mode (heat
pump only).
LC1r*
Local operation - Local On - Cooling Setpoint 1 - Heat Reclaim: the
unit is in local control mode and is authorised to start up in cooling
mode with setpoint 1 and the reclaim mode is selected. This is not
displayed if one of the following conditions is met:
• the unit is water-cooled and controls condenser water valves, and
the condensing setpoint (item 3 in the setpoint menu) is equal to the
reclaim setpoint (item 4 in the setpoint menu).
• the unit is air-cooled and the condensing setpoint (item 3 in the
setpoint menu) is equal to the reclaim setpoint (item 4 in the
setpoint menu).
LC2r*
Local operation - Local On - Cooling Setpoint 2 - Heat Reclaim: the
unit is in local control mode and is authorised to start up in cooling
mode with setpoint 2 and the reclaim mode is selected. This is
displayed if LC1r is displayed and cooling setpoint 1 (item 0 in the
setpoint menu) has a different value from cooling setpoint 2 (item 1
in the setpoint menu).
CCn
The unit is controlled by CCN commands.
rEM
The unit is controlled by external remote control contacts.
Key:
* : Displayed if the configuration requires it.
Section 5.1 gives a more detailed description of the
commands to start/stop the unit, analysed by operating
type.
4.2.2.2 - Stopping the unit in local mode
The unit can be stopped in local mode at any time by
pressing the operating type selector button.
TO STOP THE UNIT
Button
Action
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
17
17
17
17
17
17
17
17
17
17
18
18
18
18
18
18
18
18
18
18
19
19
19
19
19
19
19
19
19
19
2
3
SELECTION
BUTTONS BLOCK 4)
ITEM NUMBER (BLOCK 1)
4.2.3.1 - Selecting a menu
The MENU button allows you to select a menu from the 10
that are available. Each time you press this button one of the 10
LEDs lights up in turn alongside each of the icons representing
a menu. The active menu is the one against which the LED is
lit.
INFORMATION menu
TEMPERATURE menu
Displays the general operating parameters for the
unit.
Displays the unit operating temperatures.
PRESSURE menu
Displays the unit operating pressures.
SETPOINT menu
Displays the unit setpoints and enables them to be
modified.
Displays the status of the unit digital and analogue
inputs
Displays the status of the unit outputs and enables
them to be tested.
CONFIGURATION menu Displays the unit configuration and enables it to
be modified.
In the example that follows, the operating type to be
selected is Local Operation - Cooling Setpoint 1 (L-C1).
CHANGING THE OPERATING TYPE
Block 1 display Block 2 display
Press the operating type selector button
for more than 4 seconds
Hold down the operating type selector
button. The available operating types are
displayed one by one until the button is
released.
Release the operating type selector button
when the operating type you want is
displayed (in this example L-C1). “C”
flashes in block 1 to show that the
controller is awaiting confirmation.
12
0
OUTPUT/TEST menu
4.2.2.3 - Modifying the operating type
The unit operating type can be modified at any time by the
following method:
Press the button to confirm the
operating type selected (in this
example L-C1). “t” is displayed in
block 1 to indicate the operating type
selected. If the button is not
pressed soon enough, the controller
will cancel the change and continue
to use the previous operating type.
MENU BUTTONS (BLOCK 3)
INPUT menu
When the button is released, the unit
stops without the need for further
action.
Action
MENU LEDS
(BLOCK 3)
Block 1 display Block 2 display
Press the operating type selector button
for less than 4 seconds (one short press
is enough)
Button
4.2.3 - Displaying/modifying a menu item
To access a menu item, first choose a menu. Each menu
gives access to up to 20 items.
ALARM menu
Displays active alarms.
ALARM HISTORY menu Displays the history of alarms.
OPERATING LOG menu Displays the operating times and number of starts
for the unit and its compressors.
NOTE: To scroll quickly through the menus, hold the menu
button down.
4.2.3.2 - Selecting a menu item
The
and buttons let you scroll through the menu items.
Menu item numbers are displayed in block 1. The item number
increases or decreases every time you press the or button.
The value or status associated with the active item is displayed
in block 2.
To scroll quickly through the items, hold the
down.
or
button
NOTE: Menu items that are not in use or incompatible with the
configuration are not displayed.
The following example shows how to access item 3 in the
Pressure menu.
OPERATION
Press the MENU button until the
LED marked PRESSURE lights.
PRESS
BUTTON
BLOCK 3
DISPLAY
BLOCK 1
DISPLAY
0
0
Press one of the arrow buttons
until block 1 displays item number
3 (circuit B discharge pressure)
OPERATION
Hold down the MENU
button until the LED for
SETPOINT lights.
PRESS
BUTTON
BLOCK 3
LED
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
0
Press one of the arrow
buttons until block 1 displays
item number 2 (cooling
setpoint 2). The value for
setpoint 2 is displayed in
block 2 (6.0°C in this
example)
Press the
button to enable
the value associated with item
2 to be modified. The
Setpoint menu LED flashes
indicating that modification
mode is active.
1
6.0
1
6.0
Keep pressing the button
until the value 5.6 is
displayed in block 2. The
Setpoint menu LED in block
3 keeps flashing.
1
5.9
1
5.8
1
5.7
1
5.6
button again to
Press the
validate the change. The new
setpoint 2 is 5.6°C. The
Setpoint menu LED in block
3 stops flashing, indicating
that modification mode no
longer applies.
1
5.6
1
2
3
4.2.3.3 - Modifying the value of a parameter
Press the
button to change to modification mode. This
lets you correct the value of an item with the aid of the
and
buttons (if you are allowed to overwrite the item
concerned). When modification mode is activated, the LED
for the menu to which the item belongs flashes in block 3.
Once the required value is obtained, press the
button
again to validate the change. The LED for the menu to
which the item belongs then stops flashing in block 3,
indicating that modification mode no longer applies.
In modification mode, the value to be modified increases or
or
decreases in steps of 0.1 every time you press the
button. Holding one of these buttons down increases the
rate of increase or decrease: after 2 seconds each step
becomes 0.5, after 5 seconds the step becomes 1.0 and after
7 seconds the step becomes 2.0.
The following example shows how to modify the value of
item 2 in the Setpoint menu.
13
ITEM INFORMATION TEMPERATURES PRESSURES
SETPOINTS
INPUTS
OUTPUTS
CONFIGURATIONS ALARMS
ALARMS HIST.
OPERATING LOG
0
Operating
type
Evaporator
water entering
temperature
Circuit A
discharge
pressure
Cooling
setpoint 1
Remote
start/stop
contact status
Compressor
status
Password
Number of
active alarms/
resets
Historic
alarm code 1**
Unit
operating
hours/10
1
Mode
Evaporator
water leaving
temperature
Circuit A
suction
pressure
Cooling
setpoint 2
Remote
stepoint contact
status
Loader
status
Master circuit
select*
Active alarm
code 1**
Historic
alarm code 2**
Circuit A
operating
hours/10
2
Mode*
Copndenser
water entering
temperature*
Oil pressure
A1*
Heating
setpoint*
Remote
heat/cool
contact status*
Motor cooling
valve status
circuit A
Circuit
loading
sequence*
Active
Historic
alarm code 2** alarm code 3**
Compressor A1
operating
hours/10*
3
Mode*
Condenser
water leaving
temperature*
Oil pressure
A2
Condensing
setpoint*
Remote
reclaim operat.
contact status*
Motor cooling
valve status
circuit B
Delay at
start-up
in minutes
Active
Historic
alarm code 3** alarm code 4**
Compressor A2
operating
hours/10*
4
Mode*
Reclaim
water entering
temperature*
Oil differential
pressure
compressor A1*
Reclaim
setpoint*
Capacity
reduction
contact status*
Oil solenoid
status
Ramp
loading
selection
Active
alarm code 4**
Hisotric
alarm code 5**
Compressor B
operating
hours/10*
5
Mode*
Reclaim
water leaving
temperature*
Oil differential
pressure
compressor A2*
Capacity
reduction
setpoint as %
Evaporator
water flow
control contact
Oil heater
status
Setpoint
reset
selection
Active
alarm code 5**
Historic
alarm code 6**
Compressor B1
operating
hours/10*
6
Cooling/heating* Saturated
discharge temp.
circuit A
Economizer
pressure
A1*
Cooling
loading
rate ramp
Condenser
water flow
control contact
Oil pimp
status
Demand
limit
selection
-
Historic
alarm code 7**
Compressor B2
operating
hours/10*
7
Number of
capacity
stages
Saturated
suction temp.
circuit A
Economizer
pressure
A2*
Heating
loading
rate ramp*
Oil level
circuit A
Fan status
A1 - A2 A3- A4
Software
version
number
-
Historic
alarm code 8**
Number of
units
start-ups/10*
8
Present
demand
limit in %
Discharge gas
temperature
circuit A
Discharge
pressure
circuit B*
Cooling - 0-10 V
d.c. signal for
zero reset*
Oil level
circuit B
Fan status
B1 - B2 B3 - B4*
ENO
-
Historic
alarm code 9**
Number of
compressor A1
start-ups/10*
9
Unit
capacity
in %
Discharge
superheat,
circuit A
Suction
pressure
circuit B*
Cooling - 0-10 V
d.c. signal for
full reset*
Water flow contr. Alarm circuit A BUS
contact heat
and alarm circuit
reclaim condenser B status
-
Historic
alarm code 10**
Number of
compressor A2
start-ups/10*
10
Capacity
circuit A
Motor
temperature A1
Oil pressure
B1*
Cooling - delta
temperature for
Drain pressostat
contact
circuit A
Position
EXV A in %*
-
-
-
Number of
compressor A2
star-ups/10
11
Capacity
circuit B
in %*
Motor
temperature A2
Oil pressure
B2*
Cooling - delta
temperature for
full reset*
Drain pressostat
contact
circuit B
Position
EXV B in %*
-
-
-
Number of
compressor B1
start-ups/10*
12
Active
setpoint
Saturated disch.
temperature
compressor B
Oil differential
pressure
compressor B1
Cooling full reset
degrees value*
Evaporator
fluid level
circuit A
Fan speed/
valve position
circuit A in %*
-
-
-
Number of
compressor B2
start-ups/10*
13
Control
point
Saturated suction
temperature
Ciucuit B
Oil differential
pressure
compressor B2
Heating - 0-10 V
d.c. signal for
zero reset*
Evaporator
fluid level
circuit B
Fan speed
circuit B
in %*
-
-
-
Max. number of
start-ups
last hour
14
Active
condensing
setpoint*
Discharge temp.
circuit B*
Economizer
pressure
B1*
Heating - 0-10 V
d.c. signal for
full reset*
0-10 V
external signal
Evaporator and
condenser pump
status
-
-
-
Max. number of
average start-ups
last 24 hours
15
Capacity
override
Discharge
superheat,
circuit B
Economizer
pressure
B2*
Heating - delta
temperature for
zero reset*
-
Evaporator and
reclaim cond.
heater status
-
-
-
-
16
EXV
override
Motor
temperature B1
-
Heating - delta
temperature for
zero reset*
-
Reclaim cond.
water valve
position in %
-
-
-
-
17
hr_status
heat reclaim
mode
Motor
temperature B2
-
Heating - full
reset degrees
value*
-
Heat reclaim
solenoid valve
status
-
-
-
-
18
SMZ
Outdoor
temperature
-
-
-
Local test
interface
-
-
-
-
19
ZM
-
-
-
-
-
-
-
-
-
Key:
* Displayed if the configuration requires it.
** Displayed if the alarm exists.
- Not in use.
14
4.2.4 - Description of the INFORMATION menu
This menu is used to display the unit’s main operating
parameters.
ITEM
LOFF
L-C1
L-C2
L-H
LC1r
LC2r
CCn
rEM
n 1n 2 n 3n 4
2*** n 1n 2 n 3n 4
3*** n 1n 2 n 3n 4
4*** n 1n 2 n 3n 4
5*** n 1n 2 n 3n 4
6**
Displays active operating type
Local Off
Local On - Cooing setpoint 1
Local On - Cooing setpoint 1
Local On - heating setpoint
Local On - Cooling setpoint 1 - Reclaim)
Local On - Cooling setpoint 2 - Reclaim)
CCN Control
Remote Control
Displays active modes:
n1n2 = 1st active mode
n3n4 = 2nd active mode
Displays active modes:
n1n2 = 3rd active mode
n3n4 = 4th active mode
Displays active modes:
n1n2 = 5th active mode
n3n4 = 6th active mode
Displays active modes:
n1n2 = 7th active mode
n3n4 = 8th active mode
Displays active modes:
n1n2 = 9th active mode
n3n4 = 10th active mode
Heating/cooling operation
Cool/heat
Number of active capacity stages
Present demand limit in %
Demand limit disabled in Local operating type
Total active capacity of unit in %
Total active capacity of circuit A in %
Total active capacity of circuit B in %
Active setpoint in °C
Control point in °C
Condensing or reclaim setpoint in °C
Reserved for use by Carrier Service only
Reserved for use by Carrier Service only
Cool
Heat
7
nn
8** nnn
Inh
9
nnn
10
nnn
11* nnn
12
±nn.n
13** ±nnn
14** nn.n
15
n 1n 2
16
n 1n 2 n 3n 4
17
±nnn
Heat reclaim mode indicator, circuits A/B
18
n.n
Reserved for use by Carrier Service only
19
n.n
Reserved for use by Carrier Service only
Key:
n : numerical display
* : This item is displayed in certain unit configurations only.
** : Under certain operating conditions this item flashes (in block 1 of
main interface).
*** : This item is not displayed when zero.
Item 0
MODE NAME
1
Local Off
2
CCN Off
3
Remote off
4
Local
Operation
5
CCN
Operation
6
Remote
Operation
7
Delay at
start-up active
8
2nd cooling
setpoint active
9
Setpoint reset
active
10
Demand
limit
active
11
Ramp loading
active
12
Low temp.
protection
heating mode
FORMAT DESCRIPTION
0
1
MODE #
Displays active operating type
This item displays the current operating
type in text format.
Items 1-2-3-4-5 Displays active modes
Each of these items can display two
active modes at the same time. The first
two figures display one mode and the last
two figures display another. These items
enable up to 10 active modes to be
displayed.
For example: 510 means that modes 5 and
10 are active. 11 means that mode 11 is
active.
Description of modes:
13 + 14 Low suction
temperature
protection
DESCRIPTION
The unit has stopped in local mode because operating type
Local Off (LOFF) has been selected with the operating
type selector button.
The unit has stopped in CCN mode because operating
type CCN (CCn) has been selected with the operating
type selector button and either:
• the unit has received a CCN halt command, or
• the controller has received a start command over the
network but the start/stop remote control is authorised in
CCN mode and the controller has received a halt
command from a volt-free contact connected to the
customer terminal block (see note, section 5.1).
The unit has stopped in remote mode because operating
type Remote Control (rEM) has been selected with the
operating type selector button and the unit has received a
shutdown command from volt-free contacts. See section
3.4.3, description of start/stop contact.
The unit is authorised to start up in local mode because
operating mode Local Operation (L-C1 or L-C2 or L-H or
LC1r or LC2r) has been selected with the operating type
selector button.
The unit is authorised to start up in CCN mode because
operating type CCN (CCn) has been selected with the
operating type selector button and the unit has received a
CCN start command, and either:
• the start/stop remote control is not authorised in CCN
mode, or
• the start/stop remote control is authorised in CCN
mode and the controller has received a start command
from a volt-free contact connected to the customer
terminal block (see note, section 5.1).
The unit is authorised to start up in remote mode because
operating type Remote Control (rEM) has been selected
with the operating type selector button and the unit has
received a start command from volt-free contacts. See
section 3.4.3, description of start/stop contact.
The delay at start-up is active after the unit has been
switched on or after the unit has been stopped. If the
pause has not expired the mode is active. The delay can be
configured in the configuration menu.
The second cooling setpoint is active because one of the
following conditions has been met:
• Operating type Local Operation - Cooling Setpoint 2
(L-C2) has been selected;
• The unit is in operating type CCN (CCn) and has
received a network command to use cooling setpoint 2;
• The unit is in operating type Remote (rEM) and
cooling setpoint 2 has been selected with remote
contacts. See section 3.4.4, description of setpoint
selection contact.
Setpoint reset is active. In this mode, the unit uses the
reset function to adjust the leaving water temperature
setpoint. Depending on the configuration, the setpoint can
be reset by reference to:
• An external 0-10 V d.c. signal (supplied by customer
or 0-10 V d.c. temperature sensor);
• The difference in temperature between water leaving
and returning to the evaporator (cooling) or condenser
(heating); For the reset function to be activated it must
be configured (see section 4.2.10). Mode 9 is only
active if the reset value calculated by the system is
non-zero.
Demand limit is active. In this mode, the demand at
which the unit is authorised to operate is limited by
reference to either:
• An external 0-10 V d.c. signal (supplied by customer)
or
• A volt-free contact.
For the demand limit function to be activated it must be
configured (see section 4.2.10). Mode 10 is only active if
the machine demands capacity greater than the limit value.
Ramp loading is active. In this mode, the rate of temperature drop (cooling mode) or rise (heating mode) in °C/min
in the active heat exchanger leaving water is limited to a
preset value in order to prevent compressor overload. The
ramp values can be modified (see section 4.2.7).
The unit is in heating mode and the temperature of the
evaporator leaving water is lower than the lesser of the two
cooling setpoints. A capacity stage is removed. This mode
only applies to heat pumps.
13 = circuit A & 14 = circuit B
Protection for evaporator suction low temperature circuit
is active. In this mode, circuit capacity is not authorised to
rise if the unit is in cooling mode, and saturated suction
temperature in the circuit is lower than the frost protection
threshold.
15 = circuit A & 16 = circuit B
In this mode the circuit capacity is not authorised to rise.
15 + 16 Low discharge
superheat
protection
17
High pressure Circuit A is under high pressure protection because the HP
protection
protection threshold has been exceeded. Circuit capacity is
circuit A
not authorised to rise, and any slave compressors may be
stopped in order to prevent a high pressure break.
18
High pressure Circuit B is under high pressure protection because the
protection
HP protection threshold has been exceeded. Circuit
circuit B
capacity is not authorised to rise, and any slave
compressors may be stopped in order to prevent a high
pressure break.
19
Unit under
Unit is under control of a System Manager (FSM or CSM
III)
SM control
20
Master/slave Unit is connected to a secondary unit by a master/slave
link active
link and either:
• The unit is configured as a master and this master is
operating, or
• The unit is configured as a slave and the master is
operating.
21 + 22 Liquid level
(21 = circuit A & 22 = circuit B)
reset
Active, if there is a large difference between leaving water
circuit B
temperature and SST
15
Item 6
Heating/cooling operation
This information is only available on units
configured as heat pumps. This item shows the
current operating mode.
The cooling mode is active in the following
cases:
• The unit is in operating type Local Cooling
(L-C1 or LC2).
• The unit is in operating type CCN (CCn)
and has received a cooling operation
network command.
• The unit is in operating type Remote (rEM)
and has received a cooling operation
command from a remote contact (see
section 3.4.5, description of remote heat/
cool contact).
Item 7
Item 8
The heating mode is active in the following
cases:
• The unit is in operating type Local Heating
(L-H).
• The unit is in operating type CCN (CCn)
and has received a heating operation
network command.
• The unit is in operating type Remote (rEM)
and has received a heating operation
command from a remote contact (see
section 3.4.5, description of remote heat/
cool contact).
Number of active capacity stages
This is the number of capacity stages
operating.
Demand limit active
This is the authorised operating capacity of
the unit. The value depends on the limitation
method used (see section 4.2.10):
• based on an external 0-10 V d.c. signal;
• based on the limit setpoint and the status of
a remote contact.
Disablement of demand limit in local mode:
when the unit is in local operating mode it is
possible to disable demand limit from any
source, via the keyboard. For this purpose,
follow the procedure described below.
OPERATION
Hold down the MENU button
until the LED for INFORMATION lights.
PRESS
BUTTON
BLOCK 3
LED
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
0
Press one of the arrow buttons
until block 1 displays item
number 8 (demand limit). The
active demand limit value is
displayed in block 2 (75% in
this example).
Press the . button. The
INFORMATION menu LED
flashes indicating that modification mode is active.
Press the or . button.
“InH” is displayed in block 2.
The INFORMATION menu
LED in block 3 keeps flashing.
Press the . button again.
Demand limit is now disabled.
The INFORMATION menu
LED stops flashing.
16
1
8
75
8
75
8
lnH
8
lnH
The procedure for cancelling demand
limit disablement in local mode is exactly
as described above. When the setpoint
LED flashes, press the procedure for
cancelling demand limit disablement in
local mode is exactly as described above.
When the setpoint LED flashes, press the
or
button. This cancels the “InH”
display and restores reduction. Then
press the
button.
Item 9
Total active capacity of unit as %
This is the percentage of compressor
capacity used by the unit.
Item 10-11
Total active capacity of circuits A/B as %
This is the percentage of compressor
capacity used on circuits A/B.
Item 12
Active setpoint
This is the current heating or cooling
setpoint.
It refers to cooling setpoint 1 in the
following cases:
• The unit is in operating type Local
Operation - Cooling Setpoint 1 (L-C1
or LC1r).
• The unit is in operating type CCN (CCn)
and cooling mode, and has received a
network command to use setpoint 1.
• The unit is in operating type Remote
(rEM) and has received a command to
operate in cooling type and to use
setpoint 1, from a remote contact (see
section 3.4.4, description of remote
cooling setpoint selection contact).
It refers to cooling setpoint 2 in the
following cases:
• The unit is in operating type Local
Operation - Cooling Setpoint 2 (L-C2
or LC2r).
• The unit is in operating type CCN
(CCn) and cooling mode, and has
received a network command to use
setpoint 2.
• The unit is in operating type Remote
(rEM) and has received a command to
operate in cooling mode and to use
setpoint 2, from a remote contact (see
section 3.4.4, description of remote
cooling setpoint selection contact).
Cooling setpoint 2 is normally used for
ice storage.
It refers to heating setpoint in the
following cases:
• The unit is in operating type Local
Operation - Heating Setpoint (L-H).
• The unit is in operating type CCN
(CCn) and heating mode.
• The unit is in operating type Remote
(rEM) and has received a command to
operate in heating mode.
NOTE: The setpoint selection contact may in exceptional cases
be configured as active (configuration by Carrier Service) if
the unit operates in CCN mode as part of a master-slave link
(see section 5.18).
Item 13
Control point
This is the setpoint used by the controller to
adjust the temperature of leaving water.
Control point = active setpoint + reset. The
reset is generally positive in cooling mode
and negative in heating mode. See section
4.2.7, calculating the reset.
Item number 13 flashes (in block 1 of the
user interface) when the unit is in CCN
operating type and the control point is
forced by the CCN.
Item 14
Condensing setpoint
This is the setpoint used by the controller to
adjust the condensing or reclaim temperature.
It refers to the normal condensing setpoint
in the following cases:
• The unit is in operating type Local
Operation - Cooling Setpoint 1 (L-C1 or
LC2).
• The unit is in operating type CCN (CCn)
and cooling mode, and is under network
command for normal mode (no reclaim).
• The unit is in operating type Remote
(rEM) and has received a command to
operate in cooling mode and normal
condensing type (no reclaim), from a
remote contact (see section 3.4.6,
description of remote contact).
It refers to the reclaim setpoint in the
following cases:
• The unit is in operating type Local Cooling Setpoint 1 (LC1r or LC2r).
• The unit is in operating type CCN (CCn)
and cooling mode, and is under network
command for reclaim mode.
• The unit is in operating type Remote
(rEM) and has received a command to
operate in cooling mode and reclaim
condensing mode, from a remote contact
(see section 3.4.6, description of remote
contact).
The number for item 14 flashes (in block 1
of the user interface) when the unit is in
CCN operating mode and the condensation
value is forced by the CCN.
Item 15-16-18-19 Reserved for use by Carrier Service only
Item 17
Heat reclaim mode indicator, circuits A/B
(see section 5.20)
4.2.5 - Description of the TEMPERATURES menu
This menu displays the unit operating temperatures. All
temperatures are displayed in degrees Celsius. Access to this
menu is read-only.
ITEM FORMAT
DESCRIPTION
0
±nn.n
Evaporator entering water temperature
1
±nn.n
Evaporator leaving water temperature
2*
±nn.n
Condenser entering water temperature (if used)
3*
±nn.n
Condenser leaving water temperature (if used)
4*
±nn.n
Reclaim condenser entering water temperature (if used)
5*
±nn.n
Reclaim condenser leaving water temperature (if used)
6
±nn.n
Saturated condensing temperature circuit A
7
±nn.n
Saturated suction temperature circuit A
8*
±nn.n
Discharge gas temperature circuit A
9*
±nn.n
Discharge superheat temperature circuit A
10*
±nn.n
Motor temperature A1
11*
±nn.n
Motor temperature A2
12*
±nn.n
Saturated condensing temperature circuit B
13*
±nn.n
Saturated suction temperature circuit B
14*
±nn.n
Discharge gas temperature circuit B
15
±nn.n
Superheat temperature circuit B
16
±nn.n
Motor temperature B1
17*
±nn.n
Motor temperature B2
18
±nn.n
Outdoor temperature
Key:
n : numerical display
* : This item is displayed in certain unit configurations only.
Item 18
Outdoor temperature
This item displays the outdoor temperature
if an outdoor temperature sensor is
connected to the 0-10 V d.c. analogue input
on the customer terminal block and if that
sensor has been calibrated (by Carrier
Service). If it has not been calibrated, the
value displayed is the value of the incoming
0-10 V d.c. signal.
4.2.6 - Description of the PRESSURE menu
This menu displays the unit operating pressures. All pressures
are relative, and are expressed in kPa. Access to this menu is
read-only.
ITEM
FORMAT DESCRIPTION
0
nnnn
Discharge pressure circuit A
1
nnnn
Suction pressure circuit A
2
±nnn
Oil pressure compressor A1
3*
±nnn
Oil pressure compressor A2
4
±nnn
Differential oil pressure compressor A1
5*
±nnn
Differential oil pressure compressor A2
6
±nnn
Economizer pressure A1
7*
±nnn
Economizer pressure A2
8
nnnn
Discharge pressure circuit B
9
nnnn
Suction pressure circuit B
10
±nnn
Oil pressure compressor B1
11*
±nnn
Oil pressure compressor B2
12
±nnn
Differential oil pressure compressor B1
13*
±nnn
Differential oil pressure compressor B2
14
±nnn
Economizer pressure B1
15*
±nnn
Economizer pressure B2
Key:
n : numerical display
* : This item is displayed in certain unit configurations only.
17
4.2.7 - SETPOINT menu
This menu displays the unit setpoints. These points can be
modified when the unit is in Local operating mode.
Item 4
Reclaim setpoint
This item is used to display and modify
the reclaim setpoint. As in item 3, it is
used to control condensation.
Limiting values for the condensing setpoints
ITEM
FORMAT DESCRIPTION
0
±nn.n
1
±nn.n
Cooling setpoint 2 in °C
2*
nn.n
Heating setpoint in °C. Heat pump only.
3*
nn.n
Condensing setpoint 1 in °C.
4*
nn.n
Condensing or reclaim setpoint 2 in °C.
5
nnn
Demand limit as %
6*
n.n
Cooling mode ramp in °C/minute
7*
n.n
Heating mode ramp in °C/minute. Heat pump only.
8*
nn.n
Voltage reset 0-10 V d.c. cooling mode - Voltage for zero reset
9*
nn.n
Voltage reset 0-10 V d.c. cooling mode - Voltage for max. reset
10*
±nn.n
Delta T reset cooling - Delta T for zero reset
11*
±nn.n
Delta T reset cooling - Delta T for maximum reset
12*
±nn.n
Cooling reset - Maximum reset value in °C
13*
nn.n
Voltage reset 0-10 V d.c. heating mode - Voltage for zero reset
14*
nn.n
Voltage reset 0-10 V d.c. heating mode - Voltage for max. reset
15*
±nn.n
Delta T reset heating - Delta T for zero reset
16*
±nn.n
Delta T reset heating - Delta T for maximum reset
17*
±nn.n
Heating reset - Maximum reset value in °C
Cooling setpoint 1 in °C
°F
(psig)
°C
(kPa)
Minumum temperature
(corresponding pressure)
96
(114)
35
(788)
Maximum temperature
(corresponding pressure)
140
(229)
60
(1558)
Item 5
Items 6-7
Cooling setpoint 1 & 2
This item lets you display and modify the
cooling setpoints. Cooling setpoint 2 is
generally used for ice storage.
See section 4.2.4, description of item 10
(active setpoint) and the conditions of
use for setpoints 1 and 2.
Item 2
Heating setpoint
This item is used for heat pumps only. It
can be used to display and modify the
heating setpoint.
See section 4.2.4, description of item 10
(active setpoint) and the conditions of
use for the heating setpoint.
Limiting values for the cooling and heating setpoints
SET POINT
°F
°C
Minimum cooling value
• Water
• Medium brine (low temperature)
• Low brine (verty low temperature)
38
14
-4
3,3
-10
-20
Maximum cooling value
101
38,3
Maximum heating value
138
58.8
Minimum heating value
80
26,6
Item 3
18
Demand limit setpoint
This item is used to define the maximum
capacity that the unit is authorised to put
into operation when the demand limit
contact is closed and if reduction by
contact has been selected (see section
3.4.7, description of contact, and section
4.2.10, configuring the demand limit
method).
Range: 0 to 100 %
Key:
n : numerical display
* : This item is displayed in certain unit configurations only.
Items 0-1
CONDENSING SETPOINT
Condensing setpoint
This item is used to display and modify
the condensing setpoint. It is used by the
system to control the fan stages or a
variable speed fan (air-cooled unit) or to
control condenser water valves (watercooled unit) when the unit is not in
reclaim mode (see section 4.2.4, item 14,
the conditions of use for the normal
condensing setpoint).
Cooling/heating mode ramp
These items refer to the rates of
temperature drop (cooling mode) or
temperature rise (heating mode) in °C/
minute in the active heat exchanger
leaving water. These parameters are only
accessible if the ramp function is
validated in the configuration menu (see
section 4.2.10). When the capacity
loading of the unit is effectively limited
by the ramp, mode 11 is displayed in the
information menu (see section 4.2.4).
Range: 0.1 to 1.1°C/min
Items 8 to 17
Setpoint reset
In normal operating conditions, the unit
maintains a leaving water temperature at
the heat exchanger (i.e. evaporator in
cooling mode or condenser in heating
mode) which is more or less equal to the
active cooling or heating setpoint. This
setpoint is generally chosen by reference
to full load operating conditions. Under
partial load, it may be necessary to reset
the setpoint upwards (in cooling mode) or
downwards (in heating mode) in order to
optimise the unit performance.
The system uses the control point to
adjust the water leaving temperature:
• Control point = active setpoint + reset
(cooling mode)
• Control point = active setpoint - reset
(heating mode)
When the reset function is active (i.e.
when the calculated reset value is nonzero) mode 9 is displayed (see section
4.2.4).
Items 8-9-12
Items 13-14-17
Voltage reset - Cooling mode values
Voltage reset - Heating mode values
This function is only active when reset
based on an external 0-10 V d.c. signal
has been selected (see section 4.2.10).
Voltage reset is based on an external
0-10 V d.c. signal applied to specific inputs
on the customer terminal block (see section
3.4.10). The source of this signal is usually
a 0-10 V d.c. external ambient or air
temperature probe which gives a measure
of the load trends for the building. If this is
the case, the reset parameters are generally
configured to deliver the following:
• In cooling mode, an reset with a
negative slope. The controller
automatically resets the chilled water
setpoint upwards in response to a drop
in the outside or ambient temperature.
• In heating mode, an reset with a positive slope. The controller automatically
resets the chilled water setpoint
downwards in response to a rise in the
outside or ambient temperature.
However, the reset parameters remain
accessible to any type of configuration
and make it possible to obtain any
combination of slope and reset origin in
response to the 0-10 V d.c. input signal.
Voltage reset is a linear function which
requires three parameters to be
configured:
• A 0-10 V d.c. reference value at which
the reset is zero: this is the “voltage for
zero reset” (item 8 for cooling mode item 13 for heating mode).
• A 0-10 V d.c. reference value at which
the reset is at maximum: this is the
“voltage for maximum reset” (item 9
for cooling mode - item 14 for heating
mode).
• The maximum reset value: this is the
“maximum reset value” (item 12 for
cooling mode - item 17 for heating
mode).
Range: Voltage for zero reset:
0 to 10 volts
Voltage for maximum reset:
0 to 10 volts
The reset is calculated as follows if the
value of the “Voltage for zero reset”
exceeds the value of the “Voltage for
maximum reset”:
• The reset is zero if the external 0-10 V
d.c. reset signal exceeds the reference
value “Voltage for zero reset”.
• The reset equals the maximum reset value
if the external 0-10 V d.c. reset signal is
lower than the reference value “Voltage
for maximum reset”.
• If the 0-10 V d.c. reset signal is between
the reference values “Voltage for zero
reset” and “Voltage for maximum reset”,
the reset value is calculated by linear
interpolation between the “Maximum
reset” value and 0.
The reset is calculated as follows if the
value of the “Voltage for zero reset” is
lower than the value of the “Voltage for
maximum reset”:
• The reset is zero if the external 0-10 V
d.c. reset signal is lower than the
reference value “Voltage for zero reset”.
• The reset equals the “Maximum reset
value” if the external 0-10 V d.c. reset
signal exceeds the reference value
“Voltage for maximum reset”.
• If the 0-10 V d.c. reset signal is between
the reference values “Voltage for zero
reset” and “Voltage for maximum reset”,
the reset value is calculated by linear
interpolation between 0 and the
“Maximum reset” value.
Sample voltage reset configuration:
In this example, the cooling setpoint starts to
be reset with effect from 6.6 V d.c. (full load)
up to a maximum reset of 3°C at 5.0 V d.c.
This example assumes that the:
• Voltage reset has already been configured
in the configuration menu (see section
4.2.10, configuration).
The configuration shall be as follows:
• Zero reset if the external signal (“Voltage
for zero reset” - Item 8) is greater than 6.6
volts;
• Maximum reset 3°C (Maximum reset
value - Item 12) if the external signal
(“Voltage for maximum reset” - Item 9) is
lower than 5.0 volts.
Maximum reset value:
-16.6 to 16.6°C
19
OPERATION
Hold down the MENU button until
the LED for SETPOINT lights.
PRESS
KEY
BLOCK 3
LED
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
Let us assume that the 0-10 V d.c signal
comes from a calibrated outside temperature
probe (configuration accessible to Carrier
Service only) with the following
parameters:
• The probe delivers 0 volts at -20°C.
• The probe delivers 10 volts at 40°C.
Based on this information:
• The probe delivers 5.0 volts at 10°C.
• The probe delivers 6.6 volts at 20°C.
0
0
Press
or
until block 1
displays item number 8; this item
shows the zero reset voltage in
cooling mode. The default value (0
volts) is displayed in block 2.
Press the
button to authorise
modification of the value
associated with item 8. The
SETPOINT menu LED flashes
indicating that modification mode
is active and the value can be
modified.
Press the
until the value 6.6 is
displayed in block 2. The
SETPOINT menu LED in block 3
keeps flashing.
0
1
8
0.0
8
0.0
The active cooling setpoint reset curve is
then as follows:
8
0.1
Cooling setpoint voltage reset
8
6.6
MAXUMUM RESET VALUE
Press the
button to authorise
modification of the value
associated with item 9. The
SETPOINT menu LED flashes
indicating that modification mode
is active and the value can be
modified.
Press until the value 5.0 is
displayed in block 2. The
SETPOINT menu LED in block 3
keeps flashing.
Press the
button again to
validate the change. The new value
for item 9 is 5.0 volts. The SETPOINT menu LED stops flashing,
indicating that modification mode
no longer applies.
Press
until block 1 displays
item number 12; this item shows
the maximum reset value in
cooling mode. The default value
(0°C) is displayed in block 2.
Press the
button to authorise
modification of the value associated with item 12. The SETPOINT
menu LED flashes indicat-ing that
modification mode is active and
the value can be modified.
Press
until the value 3.0 is
displayed in block 2. The
SETPOINT menu LED in block 3
keeps flashing.
Press the
button again to validate the change. The new value for
item 12 is 3.0°C. The SETPOINT
menu LED stops flashing, indicating that modification mode no
longer applies.
20
6.6
B
9
0.0
D
UIL
ING
LO
AD
ZERO RESET VOLTAGE
MAXIMUM RESET VOLTAGE
% BUILDING LOAD
Press
until block 1 displays
item number 9; this item shows the
maximum reset voltage in cooling
mode. The default value (0 volts)
is displayed in block 2.
8
RESE T VALUE
Press the
button again to
validate the change. The new value
for item 8 is 6.6 volts. The
SETPOINT menu LED stops
flashing, indicating that
modification mode no longer
applies.
VOLTAGE RESET REFERENVE VALUE
9
0.0
9
0.1
9
5.0
9
5.0
9
5.0
12
0.0
12
0.0
12
0.1
12
3.0
12
3.0
EQUIVALENT TEMPERATURE REFERENCE VALUE
Items 10-11-12
Items 15-16-17
DT reset - Cooling mode reset values
DT reset - Heating mode reset values
This function is only active if an reset
based on water returning to the
evaporator (cooling mode) or condenser
(heating mode) has been selected (see
section 4.2.10). In the following description, ‘DT’ represents the temperature
difference between water entering and
leaving the evaporator in cooling mode
or the condenser in heating mode.
Since the difference between the leaving
water temperature and the return water
temperature is a measure of the building
load, a setpoint reset based on the return
water temperature is actually an reset
method based on the average building
load. As the building load falls from
100% to 0%, so the entering evaporator
water temperature falls in proportion to
the load. Thus a drop in temperature in
the evaporator which is in general 5.5°C
at full load would theoretic-ally become
0°C at zero load. In this event, the reset
parameters are generally configured to
deliver an reset with a negative slope:
• In cooling mode, the controller automatically resets the chilled water setpoint
upwards in response to a drop in DT.
• In heating mode, the controller
automatically resets the chilled water
setpoint downwards in response to a
rise in DT.
Sample DT reset configuration:
However, the reset parameters remain
accessible to any type of configuration
and make it possible to obtain any
combination of slope and reset origin in
response to fluctuations in the value of
DT on the active heat exchanger.
In this example, the cooling setpoint starts
to be reset with effect from a DT at the
evaporator of 5.0°C (full load) up to a
maximum reset of 3°C at a DT of 3.0°C.
This example assumes that the:
• Reset based on DT has already been
configured in the configuration menu (see
section 4.2.10, configuration).
Reset based on DT is a linear function
which requires three parameters to be
configured:
• A reference DT at which the reset is
zero: this is the DT for zero reset
referred to in item 10 for cooling mode
or item 15 for heating mode.
• A reference DT at which the reset is at
maximum: this is the DT for maximum
reset referred to in item 11 for cooling
mode or item 16 for heating mode.
• The maximum reset value: this is the
maximum reset value referred to in item
12 for cooling mode - item 17 for
heating mode.
The setpoint curve is then as follows:
Cooling setpoint DT reset
DT for zero reset:
The reset is calculated as follows if the
value of the DT for zero reset exceeds the
value of the DT for maximum reset
(negative slope):
• The reset is zero if the current DT
exceeds the reference value DT for zero
reset.
• The reset equals the maximum reset
value if the current DT is lower than the
reference value DT for maximum reset.
• If the current DT is between the
reference values DT for zero reset and
DT for maximum reset, the reset value
is calculated by linear interpolation
between the maximum reset value and
0.
The reset is calculated as follows if the
value of the DT for zero reset is lower
than the value of the DT for maximum
reset (positive slope):
• The reset is zero if the current DT is
lower than the reference value DT for
zero reset.
• The reset equals the maximum reset
value if the current DT exceeds the
reference value DT for maximum reset.
• If the current DT is between the
reference values DT for zero reset and
DT for maximum reset, the reset value
is calculated by linear interpolation
between 0 and the maximum reset
value.
BU
ILD
ING
LO
AD
DT FOR ZERO RESET
DT FOR MAXIMUM RESET
% BUILDING LOAD
0 to 13.8°C
DT for maximum reset:
0 to 13.8°C
Maximum reset value:
-16.6 to 16.6°C
MAXIMUM RESET VALUE
RESET VALUE
Range:
The configuration shall be as follows:
• Zero reset if the evaporator DT (i.e. DT for
zero reset - Item 10) is greater than 5.0°C;
• Maximum reset 3°C (Maximum reset
value - Item 12) if the evaporator DT (i.e.
DT for maximum reset - Item 11) is lower
than 3.0°C.
DT RESET REFERENCE VALUE
4.2.8 - Description of the INPUT menu
This menu displays the status of the controller inputs. Access
to this menu is read-only.
ITEM
FORMAT
DESCRIPTION
0
open/close
Remote start/stop contact status
1
open/close
Remote cooling setpoint selection contact status
2*
open/close
Remote heat/cool selection contact status
3*
open/close
Remote reclaim mode selection contact status
4
open/close
Demand limit contact status
5
open/close
Evaporator water flow control contact status
6
open/close
Condenser water flow control contact status
7
open/close
Oil level control contact status circuit A
8
open/close
Oil level control contact status circuit B
9
nn
Heat reclaim condenser water flow control contact status
10
nn
Drain pressostat contact status, circuit A
11
nn
Drain pressostat contact status, circuit B
12
nn
Evaporator liquid refrigerant level circuit A
13
nn
Evaporator liquid refrigerant level circuit B
14
nnn
0-10 V d.c signal
Key:
* : This item is displayed in certain unit configurations only.
21
Item 0
Remote start/stop contact status
This contact is used to select the
following modes of operation when the
unit is in remote operating type (rEM):
• Contact open: unit stop command
• Contact closed: unit authorised to start up.
Item 4
See section 3.4.5 for a description of the
connections for the remote start/stop
contact.
Item 1
Remote cooling setpoint selection contact
status
This contact is used to select a cooling
setpoint only when the unit is in cooling
mode and remote operating type (rEM):
• Contact open: unit using cooling setpoint
1
• Contact closed: unit using cooling
setpoint 2
This command is inactive if the unit is
operating in heating mode.
Demand limit contact status
When closed this contact limits the
demand of the unit by reference to the
value of the demand limit setpoint, if the
contact method of demand limit has been
selected (see section 4.2.10).
• Contact open: unit demand not limited
• Contact closed: unit demand limited to
the limit setting.
See section 4.2.7 for a description of
demand limit setting and section 3.4.9 for
a description of reduction contact connections.
NOTE: This contact is active in all operating types.
Item 5
See section 3.4.6 for a description of the
connections for the remote cooling
setpoint selection contact.
Interlock check contact status
When this contact opens the unit stops or is
prevented from starting and an alarm is
created. In general the contact is used to
control the evaporator water flow.
See section 3.4.8 for a description of the
connection for the lockout contact.
NOTE: This contact is active in all operating types.
Item 2
Remote heat/cool selection contact status
This contact is used to select heating or
cooling mode only when the unit is in
remote operating type (rEM):
• Contact open: unit in cooling mode
• Contact closed: unit in heating mode
This command applies to heat pumps
only.
See section 3.4.7 for a description of the
connections for the remote heat/cool
selection contact.
Item 3
Remote reclaim mode selection contact
status
This contact is used to select the second
condensing setpoint or reclaim mode
(provided the unit is of the reclaim type)
only when the unit is in cooling mode and
remote operating type (rEM):
• Contact open: unit using normal
condensing setpoint and in normal
mode (no reclaim).
• Contact closed: unit using reclaim
setpoint and in reclaim mode.
See section 3.4.8 for a description of the
connections for the remote condensation
mode selection contact.
22
Item 14
External 0-10 V d.c. signal
This signal, which is from an external
source, can be used (depending on the
configuration) for:
• The reset function
• Demand limit of the unit
See section 4.2.10 for the configuration of
the signal. See section 3.4.10 for a description of the connection for the 0-10 V d.c.
signal.
NOTE: This contact is active in all operating types.
4.2.9 - Description of the OUTPUT/TEST menu
4.2.9.1 - General
This menu displays the status of the controller outputs. When
the machine is fully stopped (LOFF) the outputs can be
actioned for tests.
ITEM
FORMAT DESCRIPTION
0
b1b2b3b4
Status of non accessible compressors in test mode
b1 : Compressor A1
b2 : Compressor A2
b3 : Compressor B1
b4 : Compressor B2
1*
b1b2b3b4
Status of loaders
b1 : Loader 1 circuit A
b2 : Loader 2 circuit A
b3 : Loader 1 circuit B
b4 : Loader 2 circuit B
2*
3
4
b1b2b3b4
b1b2b3b4
b1b2b3b4
Motor cooling valve status circuit A
b1 : Main valve compressor A1
b2 : Additional valve compressor A1
b3 : Main valve compressor A2
b4 : Additional valve compressor A2
Motor cooling valve status circuit B
b1 : Main valve compressor B1
b2 : Additional valve compressor B1
b3 : Main valve compressor B2
b4 : Additional valve compressor B2
Oil solenoid valve status
b1 : Oil solenoid valve compressor A1
b2 : Oil solenoid valve compressor A2
b3 : Oil solenoid valve compressor B1
b4 : Oil solenoid valve compressor B2
5
b1b2
Oil heater status
b1 : Oil heater circuit A
b2 : Oil heater circuit B
6
b1b2
Oil pump status
b1 : Oil pump circuit A
b2 : Oil pump circuit B
b1b2b3b4
Fan stages status circuit A
b1 : Fan stage 1
b2 : Fan stage 2
b3 : Fan stage 3
b4 : Fan stage 4
7
8
b1b2b3b4
Fan stages status circuit B
b1 : Fan stage 1
b2 : Fan stage 2
b3 : Fan stage 3
b4 : Fan stage 4
9
b1b2
Alarm outputs status
b1 : Circuit A
b2 : Circuit B
10*
nnn
EXV position circuit A
11*
nnn
EXV position circuit B
12*
nnn
Variable fan speed or condenser water valve position as % - Circuit A
13
nnn
Variable fan speed as % - Circuit B
14
b1b2
Evaporator and condenser pump status
15
b1b2
Evaporator and heat reclaim condenser heater status
b1: Evaporator heater
b2: Heat reclaim condenser heater
16
nnn
Heat reclaim condenser water valve position in %
17
b1b2b3b4
Heat reclaim mode solenoid valve status
b1: Heat reclaim coil shutoff solenoid valve, circuit A
b2: Heat reclaim coil drain solenoid valve, circuit A
b3: Heat reclaim coil shutoff solenoid valve, circuit B
b4: Heat reclaim coil drain solenoid valve, circuit B
18
n
Local interface test
Key:
* : This item is displayed in certain unit configurations only.
b : 0 = Open/Closed; 1 = Start/Stop
n : numerical display
Item 1
For example:
Test of loader 2 circuit A and loader 1
circuit B. The password must already
have been entered in the Configuration
menu. If not, the message “no” will be
displayed in block 2 (see section 4.2.10).
OPERATION
PRESS
KEY
BLOCK 3
LED
Hold down the MENU button until
the LED for OUTPUTS/TESTS
lights.
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
"no"
0
Press the
loader.
button to go to item
1
0001
1
0001
1
0100
1
0100
Press the . button again. Loader
2 of circuit A stops and the LED
for OUTPUTS/TESTS in block 3
starts flashing again.
1
0001
Press
until the value 0010 is
displayed in block 2. The LED for
OUTPUTS/TESTS in block 3
keeps flashing.
1
0010
button to start loader
Press the
1 of circuit B. The LED for
OUTPUTS/TESTS in block 3
stops flashing.
1
0010
Press the
button to authorise
modification of the value
associated with item 1. The
OUTPUTS/TESTS menu LED
flashes to show that modification
mode is active and the value can
be modified.
Press
until the value 0100 is
displayed in block 2. The LED for
OUTPUTS/TESTS in block 3
keeps flashing to show that
modification mode is active.
Press the . button again. Loader
2 of circuit A starts and the LED
for OUTPUTS/TESTS in block 3
stops flashing.
4.2.9.2 - Outputs other than loaders
The test procedure is as described above.
Item 2*
Item 3*
Item 4*
Item 5*
Item 6*
Status/test motor cooling valves circuit A
Status/test motor cooling valves circuit B
Status/test oil soleniod valves circuits A + B
Status/test oil heater outputs circuits A + B
Status/test oil pump outputs circuits A + B
Item 7
Item 8
Fan stages status/test circuit A
Fan stages status/test circuit B
In test mode, the or buttons in block 4
display 0001, 0010, 0100 and 1000 in succession, so as to force the various fan stages in
turn on each circuit. These items only apply to
air-cooled units.
Item 9
Alarm output status/test - Circuits A & B
In test mode, the or buttons in block 4
display 01, and 10 in succession, so as to force
each alarm output status in turn on each
circuit.
Access to the tests is password controlled. The password must
first have been entered in the Configuration menu (see section
4.2.10).
To carry out a test use the or buttons to access the output
to be tested and press the A button to activate modification
mode. The Output/Test LED on the user interface starts to
flash. Enter the required test value and press
to start the test.
The Output/Test LED stops flashing. Press , or to stop
the test.
Status/Test of loaders
These items display the status of the
compressors on circuit A or B. They can
also test them independently.
23
Item 10
Item 11
EXV status/test - Circuit A
EXV status/test - Circuit B
In test mode, the direction arrows display
“OPEN” so as to force the valve to its
maximum open position.
Item 12
Variable speed fan or condenser water
valve status/test - Circuit A
Item 13
Variable speed fan status/test - Circuit
B
In test mode, each element can be tested at a
value in the range 0 to 100%. Item 13 is not
applicable to air-cooled units.
Item 14**
Evaporator and condenser water pump
status/test
Item 15*
Evaporator and heat reclaim condenser
heater status/test
Item 0
Password
A password must be entered in order to
access the test function or modify a user
configuration. The password has a
default value of 11. This value can be
modified by Carrier Service with the aid
of special tools. If the message “no” is
displayed in block 2, it means that a
password must be entered or was entered
incorrectly. The message “Good” means
that the password has been validly
entered or that the password already
entered is still valid. The controller
automatically deactivates the password
after 5 minutes without activity (i.e. no
buttons pressed) or after powering up.
For example: “enter password”.
Item 16
Heat reclaim condenser water valve
output status/test - see item 13
Item 17*
Item 18
Heat reclaim mode solenoid valve
status/test
Local interface test
This item is only used in test mode. It
causes all the LEDs on the user interface to
light up or flash, so as to check that they are
working properly.
* See items 7 and 8
** See item 9
4.2.10 - Description of the CONFIGURATION menu
This menu can be used to display and modify user
configurations.
A configuration can only be modified when the machine is
fully stopped (LOFF). However, the password must have been
entered in the Configuration menu in order to access this
feature.
ITEM
FORMAT DESCRIPTION
0
nn
«no»
«Good»
Password
Password invalid
Password valid
1*
b
Lead/lag select
2*
b
Loading sequence select
3
nn
Delay at start-up in minutes
4
b
Select ramp loading
5
b
Select reset type
6
b
Select demand limit type
7
nn.n
Software version
8
nnn
Network element address
9
nnn
Network bus number
Key:
* : This item is displayed in certain unit configurations only.
b : 1=Yes; 0=No
n : numerical display
: characters
24
OPERATION
PRESS
KEY
BLOCK 3
LED
Hold down the MENU button
until the LED for Configuration
lights. Block 2 displays “no”,
showing that the password must
be entered
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
0
No
0
0
0
11
0
Good
.
Press the
button to authorise
modification of the value
associated with item 0. The
Configuration menu LED flashes
to show that the value can be
modified.
Press
until the value 11 is
displayed in block 2. The
Configuration menu LED keeps
flashing.
Press the
button again to
validate. The Configuration menu
LED stops flashing. “Good” is
displayed if the password is
correct.
Item 1
Select lead circuit
Default: 0
Range: 0, 1 or 2
Config.: 0 = automatic depending on the
number start-ups of each circuit
1 = Circuit A leader
2 = Circuit B leader
Item 2
Circuit loading sequence
Default: 0
Range: 0 or 1
Config.: 0 = Equal circuit loading
1 = Priority loading on one circuit
NOTE: This configuration is not available on single-circuit
units.
Item 3
Delay at start-up delay
Default: 2 minutes
Range: 2 to 15 minutes
NOTE: This value is reinitialised after power up or when
both circuits are halted by a local, remote or CCN
command.
No compressor will be started up until this pause has
expired. However, the evaporator water pump command
will be activated immediately. The safety lockout loop will
not be checked until the pause has expired.
Item 4
Select ramp loading
Default: 0
Range: 0 or 1
Config.: 0 = Ramp disabled
1 = Ramp enabled
NOTE: This configuration enables the ramp to be activated
for heating and cooling modes: the maximum rate (in°C/
min) of temperature drop (in cooling mode) or temperature
rise (in heating mode) for the water leaving the active heat
exchanger. However, each mode has its own ramp setting
which can be configured in the Configuration menu.
Item 5
Leaving water temperature reset select
Default: 0
Range: 0, 1 or 2
Config.: 0 = Reset not selected
1 = Reset based on returning
water temperature
2 = Reset based on an external 010 V d.c. signal
NOTE: Reset based on a 0-10 V d.c. signal has precedence
over 0-10 V d.c. demand limit: if 0-10 V d.c. reset has
already been selected, then the selection of limitation by a
0-10 V d.c. signal will be automatically disabled.
Item 6
Item 9
CCN bus number
Default: 0
Range: 0 to 239
NOTE: No two network elements can have the same element
number and bus number at the same time.
4.2.11 - Description of the ALARMS menu
This menu can be used to display and reset up to 5 active
alarms.
ITEM
FORMAT DESCRIPTION
0
n «AL»
n alarms active/alarm resets
1*
nnn
Active alarm code 1
2*
nnn
Active alarm code 2
3*
nnn
Active alarm code 3
4*
nnn
Active alarm code 4
5*
nnn
Active alarm code 5
Key:
n : numerical display
* : This item is displayed if the alarm is active
Item 0
Select demand limit type
Default: 0
Range: 0, 1 or 2
Config.: 0 = Limitation not selected
1 = Limitation based on an
external contact
2 = Limitation based on an
external 0-10 V d.c. signal
Number of alarms active/Reset all alarms
This item displays the number of alarms
active (e.g. “3 AL” means that 3 alarms
are active) and also allows them to be
reset even if the unit is operating. If there
are no alarms active, “0 AL” is displayed
in block 2.
To reset active alarms, press the
button
twice in succession when this item is
displayed.
For example: Reset active alarms
NOTE: Limitation based on an external 0-10 V d.c. signal.
With this configuration, a value of 0 volt will enable the
unit to operate at full capacity (100%), and a value of 10
volts will limit demand completely (0%). Between these two
values, limitation shall exhibit a linear slope. However,
these reference voltage values (0 and 10 volts) are
configurable (by Carrier Service only), so that their upper
and lower values or the direction of the limitation slope can
be modified.
CAUTION: Reset based on a 0-10 V d.c. signal has
precedence over 0-10 V d.c. demand limit: if 0-10 V d.c.
reset has already been selected, then the selection of
limitation by a 0-10 V d.c. signal will be automatically
disabled.
Item 7
Software version number
OPERATION
PRESS
KEY
Hold down the MENU button
until the LED for Alarms lights.
Block 2 displays the number of
alarms active (2 alarms in this
example).
Press the A button to authorise the
alarms to be reset. The Alarm
menu LED flashes and 0 is
displayed in block 2.
Press the A button again to
validate the reset. The Alarm menu
LED stops flashing. “Good” is
displayed for two seconds, then
‘2AL’ and finally ‘0 AL’.
Items 1 to 5
BLOCK 3
LED
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
0
2 AL
0
0
0
Good
then
2 AL
then 0 AL
Active alarm code number
See section 6.4 for a list and complete
description of the alarm codes.
NOTE: This item shows the number of the software version
used by this controller. Access is read-only.
Item 8
CCN element address
Default: 1
Range: 1 to 239
NOTE: No two network elements can have the same element
number and bus number at the same time.
25
4.2.12 - Description of the ALARMS HISTORY menu
This menu lets you display the last 10 alarms to have been
reset.
ITEM FORMAT DESCRIPTION
0*
nnn
Alarms history 1
1*
nnn
Alarms history 2
2*
nnn
Alarms history 3
3*
nnn
Alarms history 4
4*
nnn
Alarms history 5
5*
nnn
Alarms history 6
6*
nnn
Alarms history 7
7*
nnn
Alarms history 8
8*
nnn
Alarms history 9
9*
nnn
Alarms history 10
Key:
n : Numerical display
* : This item is displayed if the alarm exists
4.2.13 - Description of the OPERATING LOG menu
This menu lets you display the operating times and number
of start-ups for the machine, circuits and compressors. The
values displayed are divided by 10 (except for the last two
items), so that numbers of hours or start-ups of less than 10
are displayed as 0.
ITEM FORMAT DESCRIPTION
0
nnnn
Number of unit operating hours/10
1
nnnn
Number of operating hours circuit A/10
2
nnnn
Number of operating hours compressor A1/10
3*
nnnn
Number of operating hours compressor A2/10
4
nnnn
Number of operating hours circuit B/10
5*
nnnn
Number of operating hours compressor B1/10
6*
nnnn
Number of operating hours compressor B2/10
7
nnnn
Number of unit start-ups/10
8
nnnn
Number of start-ups compressor A1/10
9*
nnnn
Number of start-ups compressor A2/10
10
nnnn
Number of start-ups compressor B1/10
11*
nnnn
Number of start-ups compressor B2/10
12
nn
Maximum number of start-ups during the last hour
13
nn
Average maximum number of start-ups during the last 24 hours
Key:
n : Numerical display
* : This item is displayed in certain unit configurations only.
26
4.2.14 - Default user interface display
The default display is activated when the keypad has remained
inactive for 5 minutes.
The user interface displays in turn:
• The heat exchanger leaving water temperature (evaporator in
cooling mode and condenser in heating mode).
In addition:
• Active operating type: “LOFF”, “L-C1”, L-C2", “L-H”,
“LC1r”, “LC2r”, “CCn”, “rEM”.
• “SM” of the unit is under the control of a System Manager
(FSM or CSM III).
• “MASt” if the Master/Slave function has been activated and
the unit is the master.
• “SLA” if the Master/Slave function has been activated and
the unit is a slave.
4.3 - Summary interface
4.3.1 - General
The summary interface includes a mimic diagram of the unit,
together with pushbuttons and LEDs. It gives quick access to
the main operating parameters of the unit. The summary
interface shown below is for a dual-circuit water-cooled unit.
kPa
kPa
A
B
A
kPa
B
MENU
kPa
kPa
SUMMARY INTERFACE
4.3.2 - Description of the LEDs
LED
INDICATION WHEN LIT
Green LED: the unit is authorised to start or is already running
Red LED:
• Lit = circuit A or unit shut down by alarm
• Flashing = circuit A or unit running with alarm present
Red LED:
• Lit = circuit B or unit shut down by alarm
• Flashing = circuit B or unit running with alarm present
Red LED: Lock contact open
4.3.3 - The push buttons
The buttons allow immediate access to certain information
(items) supplied by the main interface. Pressing one of these
buttons causes the value of the item to be displayed
immediately in block 2 and the number of the corresponding
item to be displayed in block 1. It also lights the LED for the
menu containing this information. Pressing the same button
several times displays several pieces of information in
succession.
LED
DISPLAY
Green LED: the unit is in cooling mode
Evaporator/condenser leaving water temperature in °C
Green LED: the unit is in heating mode
Yellow LEDs: from top to bottom - start/stop status of compressors A1 and A2. A
flashing LED indicates that the HP load shedding option is active on circuit A.
Evaporator/condenser entering water temperature in °C
Yellow LEDs: from top to bottom - start/stop status of compressors B1 and B2. A
flashing LED indicates that the HP load shedding option is active on circuit B.
Key:
* : LED available depending on unit configuration.
Control point (setpoint + reset) in °C
kPa
Press 1: Circuit A discharge pressure in kPa
Press 2: Circuit A saturated condensing temperature in °C
kPa
Press 1: Circuit A suction pressure in kPa*
Press 2: Circuit A saturated suction temperature in °C*
Press 1: Compressor A1/B1 operating hours in h/10*
Press 2: Compressor A2/B2 operating hours in h/10*
Key:
* : Button available depending on unit configuration.
h : Hours
27
5 - PRO-DIALOG PLUS CONTROL OPERATION
5.1 - Start/stop control
The unit is in stop mode and is not authorised to start up if at
least one of the following conditions is met:
• The unit is in Local Off operating type (LOFF): mode 1 is
active.
• The unit is in operating type Remote (rEM) and the controller
has received a stop command over a volt-free contact
connected to the customer terminal block: mode 3 is active.
• The unit is in operating type CCN (CCn) and either:
- the controller has received a stop command over the
network: mode 2 is active; or
- the controller has received a start command over the
network but start/stop control by volt-free contact is
authorised in CCN mode and the controller has received
a stop command over a volt-free contact connected to
the customer terminal block: mode 2 is active.
• The delay at start-up has not expired: mode 7 is active.
• The unit is in the process of switching from heating to
cooling mode: it has completely stopped before restarting.
• CCN has commanded an emergency shutdown (EMSTOP
activated).
• The unit is totally shut down due to an alarm.
The unit is authorised to start if it is not in stop mode (see
above) and if one of the following conditions is met:
• The unit is in Local operating type (L-C1, L-C2, L-H, LC1r,
LC2r): mode 4 is active.
• The unit is in Remote operating type (rEM) and the controller
has received a start command over a volt-free contact
connected to the customer terminal block: mode 6 is active.
• The unit is in CCN operating type (CCn) and the controller
has received a start command over the network, and either:
- start/stop control by volt-free contact is not authorised in
mode CCN: mode 5 is active; or
- start/stop control by volt-free contact is authorised in
mode CCN and the controller has received a start
command over a volt-free contact connected to the
customer terminal block: mode 5 is active.
NOTE: In CCN operating mode, it is possible to authorise unit
start/stop over a volt-free contact connected to the customer’s
terminal block. This configuration (which must be carried out
by Carrier Service) is exceptional and generally only used for
controlling a master unit in a master/slave grouping (see
section 5.18).
5.2 - Heating/cooling selection
On heat pumps, heating/cooling selection can be controlled
differently depending on the active operating type:
• Locally on the unit, using operating types L-C1, L-C2, LC1r
and LC2r (for cooling) and L-H (for heating).
• Remotely using the heat/cool selection volt-free contact when
the unit is in Remote operating type (rEM).
• Via a CCN command when the unit is in CCN operating type
(CCn).
The current heat/cool operating mode on the unit is indicated
by item 4 in the Information menu and by the heat/cool LEDs
on the summary interface.
28
5.3 - Evaporator water pump control
The evaporator water pump is started when the unit is in the
running mode described above or in delay at start-up mode (i.e.
mode 7). Since the minimum value for the delay at start-up is 2
minutes (configurable between 2 and 15 minutes), the pump
will run for at least two minutes before the first compressor
starts. The pump is kept running for one minute after the unit
goes to stop mode. The pump keeps working when the unit is
switching from heating to cooling mode or vice-versa. It is
turned off if the unit is shut down due to an alarm unless the
fault is a frost protection error or risk of freezing.
5.4 - Condenser water pump control
Only available on water-cooled units.
The condenser pump can be controlled by two modes, depending on the configuration (only accessible by Carrier Service).
1 - Control based on unit start/stop control. In this case it is
controlled in the same way as the evaporator pump.
2 - Control based on compressor status. In this case the pump
is activated at the same time as the first compressor. It
only switches off when no compressor is activated.
5.5 - Control point
Control point represents the leaving water temperature that the
unit must produce.
• In cooling mode: control point = active setpoint + reset
• In heating mode: control point = active setpoint - reset
5.5.1 - Active setpoint
Two setpoints can be selected as active in cooling mode.
Usually, the second setpoint is used for unoccupied periods or
for ice storage (medium or low brine unit). A single setpoint is
available in heating mode.
Depending on the current operating mode, the active setpoint
can be selected with the operating type selector button, or with
the user’s volt-free contacts, or with network commands (see
section 4.2.7).
5.5.2 - Reset
Reset means that the active setpoint is modified in such a way
that the capacity required by the unit is less (in cooling, the
setpoint is increased, and in heating it is lowered). This
modification is in general a reaction to a drop in the load. For
the PRO-DIALOG control system, the source of the reset can
be configured: it can be delivered either by an external 0-10 V
d.c. signal (e.g. outside temperature probe) or by the return
water temperature. In both cases the reset parameters, i.e.
slope, source and maximum value, are configurable in the
Setpoints menu (see section 4.2.7) and are also independent for
the heating and cooling modes.
5.6 - Demand limit
Generally, demand limit is used by an energy management
system in order to restrict the unit electricity consumption.
The PRO-DIALOG control system for 30GX & 30HX
provides two methods of demand limit:
• By reference to a limiting signal from a user-controlled voltfree contact: the capacity of the unit cannot exceed the
demand limit setpoint (which can be modified in the
Setpoints menu) when the limit contact is closed.
• By reference to an external 0-10 V d.c. signal: the capacity of
the unit cannot exceed the demand limit imposed by this
external signal. It is a linear function and its parameters are
configurable by Carrier Service (voltages at 0% limitation
and 100% of limitation). This function is not available if
Reset by reference to an external 0-10 V d.c. signal has
already been selected.
Whatever the method used, demand limit is active in all
operating types: Local, Remote or CCN. However, in Local
operating type, demand limit can be disabled with keypad
commands (see section 4.2.4) and in CCN operating type,
demand limit can be controlled directly with the aid of CCN
commands.
Note: A limitation value of 100% means that the unit may call
upon the full array of its capacity stages.
Here is an example of demand limit by an external 0-10 V d.c.
signal. This example assumes that the limitation parameters are
such that at 0 volt the authorised capacity shall be maximum
capacity, and at 10 volts the authorised capacity shall be zero
(this is the default configuration).
Demand limit by 0-10 V d.c. signal
MAXIMUM PERMITTED CAPACITY
NO DEMAND LIMIT
TOTAL DEMAND LIMIT
0-10 V DC DEMAND LIMIT
5.8 - Determining the lead circuit
This function commands the start/stop sequence of the two
refrigerant circuits called A and B. The circuit authorised to
start first is the lead circuit. Three methods can be configured
by the user in the Configuration menu:
• Auto mode: the control system determines the lead circuit so
as to equalise the number of starts on each circuit (value
weighted by the operating times of each circuit). Thus, the
circuit with the least number of starts is always given
precedence to start. The lead circuit is stopped last.
• Circuit A as leader: Circuit A is always the lead circuit. It is
the first to start and the last to stop.
• Circuit B as leader: Circuit B is always the lead circuit. It is
the first to start and the last to stop.
5.9 - Circuit loading sequence
Two circuit loading sequences are available. The choice of
sequence can be configured by the user in the Configuration
menu (see section 4.2.10).
• Balanced circuit loading: If this sequence is selected, the
control system tries to keep the capacity of circuits A and B
equal as the total load on the unit increases or decreases.
• Loading with priority given to one circuit: If this sequence
is selected, the control system loads the lead circuit
completely before the second circuit starts up. When there is
a demand limit, the second circuit is unloaded first.
NOTE: 30HX and 30GX units use 06N twin screw compressors.
The screw compressor efficiency is better at full load than at
part load. By default the close control configuration (temperature precision has priority over compressor efficiency - this
parameter is only accessible by Carrier Service) is not validated, and the control will always try to optimise unit efficiency.
5.10 - Compressor start-up sequence in one circuit
The first compressor to start is the one with the least number of
start-ups and operating hours. If both compressors are
operating and the load decreases, the compressor that started
first shuts down. This avoids cycling of ther same compressor.
5.7 - Capacity control
5.11 - Controlling the EXV
This function adjusts the number of active compressors and
loaders to keep the leaving water temperature at its setpoint.
The precision with which this is achieved depends on the
capacity of the water loop, the flow rate, the load, and the
number of stages available on the unit.
EXVs control the refrigerant flow in the evaporator. Each
circuit has a liquid level detector that is mounted vertically
high in the evaporator shell. The level detector consists of a
small electric resistance heater and of three thermistors wired
in series and mounted at different levels inside the well body.
The heater is used so that the thermistors reach approximately
93°C dry air. As the refrigerant level increases in the
evaporator, the resistance of the nearest thermistor(s) changes
considerably. This difference in resistance permits precise
control of the specified level, modulating the EXVs.
The control system continuously takes account of the
temperature error with respect to the setpoint, as well as the
rate of change in this error and the difference between entering
and leaving water temperatures, in order to determine the
optimum moment at which to add or withdraw a capacity stage.
NOTE: If the same compressor undergoes too many starts (per
hour) this automatically brings about reduction of compressor
starts, which makes leaving water temperature control less
precise.
29
5.12 - Motor cooling valve control
5.17 - Start-up procedure - prelubrication
The temperature of the motor windings is controlled to a
setpoint of 85°C. This is achieved by cycling of the motor
cooling valves to allow the refrigerant to flow across the motor
windings, if necessary. For units with economizer, instantaneous vapour leaves the high side of the economizer and
continuously flows across the motor windings. All refrigerant
used for motor cooling returns to the rotors through an orifice
situated mid-way along the compression cycle and is
compressed to the discharge pressure.
This procedure describes the necessary procedures to ensure the
lubrication of the compressor before start-up.
5.13 - Head pressure control on air-cooled units
• The saturated condensing temperature is controlled by
reference to a fixed setpoint (user-definable in the Setpoints
menu). This temperature is maintained by cycling fans on
and off, as well as by varying the speed of a fan.
NOTE: Certain units can have up to 4 fan stages and a variable speed fan per circuit, depending on their configuration
and wiring.
The control follows the sequence below:
For the lead compressor (the first compressor in the circuit to
start):
1. Start the oil pump and measure the initial oil pressure.
2. Wait approximately 30 seconds.
3. Verify the oil solenoid valve tightness, i.e.: if oil pressure
increases and the solenoid valve is not open, the oil
solenoid valve failure alarm is activated and prelubrication is stopped. The procedure is aborted.
4. If not, the oil solenoid valve is activated.
5. Wait approximately 15 seconds.
6. If oil pressure increases, prelubrication is assured and the
compressor can start.
7. If not, a further prelubrication cycle is started. Return to
point 1.
5.14 - Head pressure control on water-cooled units
NOTE: After three cycles, the low oil pressure alarm at pre
start-up is acctivated, and prelubrication is also stopped.
• The saturated condensing temperature is controlled by
reference to a user-definable fixed setpoint. This temperature
is maintained by using the valve to control the flow of water
in each condenser circuit.
For the lag compressor (one compressor in the circuit is already
in operation).
5.15 - Head pressure setpoint selection
1.
2.
3.
There are two head pressure setpoints available: the first is
called “head pressure setpoint” and the second “reclaim
setpoint”. These setpoints only have an effect when the control
system is controlling head pressure: air or water-cooled units
operating in cooling mode (only when they are fitted with
condenser water valves).
The active setpoint can be selected in one of the following
ways:
• With the operating type selector button: selections L-C1 and
L-C2 activate the head pressure setpoint. Selections LC1r
and LC2r activate the reclaim setpoint (see section 4.2.2,
description of the operating modes).
• With a volt-free selection contact connected to the customer
terminal block when the unit is in Remote operating type
(rEM). See section 3.4.4, description of the control contacts.
• With a network command when the unit is in CCN operating
type (CCn).
5.16 - High pressure load shedding function
This function does not require an additional board. It prevents
high pressure breaks on a circuit by the following means:
• Preventing any capacity increase on the circuit once the high
pressure value has reached an initial threshold.
• Shedding one or more capacity stages once a second protection threshold has been reached.
In the event of capacity stages being shed, no capacity increase
will be authorised on the circuit concerned for a period of 5
minutes.
NOTE: The last capacity stage cannot be shed by this protection function. An alarm is activated, if the high pressure is still
too high.
30
4.
Activate the oil solenoid valve.
Wait approximately 15 seconds.
If oil pressure increases, prelubrication is assured and the
compressor can now start.
If not, the low oil pressure at start-up alarm is activated
and the prelubrication is also stopped.
5.18 - Master/slave assembly
5.18.1 - General
Two PRO-DIALOG Plus units can be linked to produce a
master/slave assembly. This feature is only authorised in
cooling mode. The two machines are interconnected over the
CCN bus. To operate as master/slave, both units must have
their chilled water temperature probes located on the common
evaporator entering and leaving line. In addition interlock
control of the cooler water flow and a freeze protection switch
is imperative on each unit.
The master/slave link only operates when both units are in
CCN operating mode. The master/slave assembly will be
inactive in the following cases:
• If either of the chillers is in Local or Remote mode, or in
heating mode.
• A demand limit command is sent to the slave unit.
• One of the following CCN variables is forced on the slave
unit: start unit, demand limit or control point.
All control commands to the master/slave assembly (start/stop,
setpoint, load shedding, etc.) are handled by the unit which is
configured as the master, and must therefore only be applied to
the master unit. They will be transmitted automatically to the
slave unit. Therefore to start up the assembly, simply validate
operating mode CCN (i.e. CCn) on the master unit (with the
CCN start/stop variable previously forced to Enable). The slave
unit stays in CCN operating type continuously. To stop the
master/slave assembly, select Local Off (LOFF) on the master
unit. In some cases with a specific configuration, remote voltfree contacts can be used to control unit start/stop or to select
setpoint 1 or 2, even though both units are still in CCN
operating mode.
NOTE: All parameters required for the master/slave function
must be configured by Carrier Service.
5.18.2 - Balancing running times between master and slave
The master unit (depending on its configuration) may have as
part of its functions to designate whether the master or slave is
to be the head machine or the follower. The roles of head
machine and follower will be reversed when the difference in
running hours between the two units exceeds a configurable
value, ensuring that the running times of the two chillers are
automatically equalised. The changeover between head
machine and follower may take place when the assembly is
started up, or even whilst running.
The running time balancing function is not active when:
• It has not been configured: in this case the head machine is
always the master unit.
• A demand limit is applied to the master unit: in this case the
head machine will always be the master unit until the
demand limit is lifted.
5.18.3 - Starting the follower unit
The head machine will always be started first. When the head
machine is at its full available capacity, the start-up delay
(configurable) is initialised on the follower. When this delay
has expired, and if the error on the control point is greater than
1.7°C, the follower unit is authorised to start and the pump is
activated. The follower will automatically use the master unit’s
active setpoint. The head machine will be held at its full
available capacity for so long as the active capacity on the
follower is not zero. When the follower unit is commanded to
stop, its cooler water pump is turned off with one minute delay.
5.18.4 - Abnormal operating conditions
In the event of a communication fault between the two units,
each shall return to an autonomous operating mode until the
fault is cleared. If the master unit is halted due to an alarm, the
slave unit shall be authorised to start without prior conditions.
5.19 - Controlling a Pro-Dialog Plus unit with a
System Manager
Up to 8 PRO-DIALOG Plus units (or System Manager
compatibles) can be controlled by one control module of the
FSM or CSM III type which can handle multi-tasking of control
functions such as starting units in sequence.
5.20 - Optional heat reclaim module
This option only applies to air-cooled units, equipped with a
water-cooled heat reclaim condenser. An additional 4 x DO
board must be installed. This board permits control of:
two solenoid shutoff valves for the heat reclaim coil, one
per circuit.
two drain solenoid valves, one per circuit. These permit
draining the refrigerant from the inactive coil, when the
unit changes over from the cooling mode to the heat
reclaim mode.
Selecting the heat reclaim mode can be done with either the
local interface or remotely with the (recl_sw) contact or by
CCN.
The heat reclaim function is active when: the heat reclaim
entering water temperature is lower than the heat reclaim
setpoint, minus half of the heat reclaim dead band.
The heat reclaim function is not active when: the heat reclaim
entering water temperature is higher than the heat reclaim
setpoint, plus half of the heat reclaim dead band.
In the dead band the function remains in its active mode. The
default value of the dead band is 4.4°C. This value can be
modified by Carrier Service.
Change-over procedure from cooling mode to heat reclaim
mode:
Start-up of the condenser pump
Verification of the condenser flow switch control contact.
If this remains open after one minute of condenser pump
operation, the circuit remains in cooling mode and alarm
83 for circuit A (alarm 84 for circuit B) will be activated.
As soon as the saturated condensing temperature reaches
30°C and the superheat reaches 8.3 K, the pumpdown
sequence is activated.
Pumpdown: closing of the cooling mode coil shutoff
valve. Opening of the drain valve, closing of the EXV
valve.
As soon as the drain pressostat contact (contact pd_a_sw
for circuit A, item 10 of the INPUTS menu (contact
pd_b_sw for circuit B, item 11 of the INPUTS menu) is
open, the drain valve will close and the heat reclaim
function is active.
Item 17, hr_status, of the INFORMATION menu permits
consulting different heat reclaim function sequences:
hr_status with format n1n2 with:
n1 = sequence of circuit A
n2 = sequence of circuit B
0 = cooling mode
1 = heat reclaim mode selection
2 = pumpdown sequence
3 = effective heat reclaim mode
4 = pumpdown fault*
5 = water flow switch fault*
*
Alarm 83 for circuit A or 84 for circuit B is activated. Consulting the
item hr_status gives cause as (4) or (5). Resetting of the alarms reinitialises the information of hr_status.
31
6 - DIAGNOSTICS - TROUBLESHOOTING
6.3 - Resetting alarms
6.1 - GENERAL
When the cause of the alarm has been corrected the alarm can
be reset, depending on the type, either automatically on return
to normal, or manually when action has been taken on the unit.
The PRO-DIALOG Plus control system has many fault tracing
aid functions. The local interface and its various menus give
access to all the units operating conditions. The test function
makes it possible to run a quick test of all the devices on the
unit.
If an operating fault is detected, an alarm is activated and an
alarm code is stored in the Alarm menu.
6.2 - Displaying alarms
The alarm LEDs on the summary interface (see section 4.3.2)
give a quick display of the status of each circuit and the unit as
a whole.
• A flashing LED shows that the circuit is operating but there
is an alarm.
• A steady LED shows that the circuit has been shut down due
to a fault.
The Alarm menu on the main interface displays up to 5 fault
codes that are active on the unit.
A manual reset must be run from the main interface using the
following procedure:
OPERATION
Hold down the MENU button
until the LED for Alarms lights.
Block 2 displays the number of
alarms active (2 alarms in this
example).
Press the
button to authorise
the alarms to be reset. The Alarm
menu LED flashes and 0 is
displayed in block 2.
Press the
button again to
validate the reset. The Alarm menu
LED stops flashing. “Good” is
displayed for two seconds, then
‘2AL’ again, and finally ‘0 AL’.
PRESS
KEY
BLOCK 3
LED
BLOCK 1
DISPLAY
BLOCK 2
DISPLAY
0
0
2 AL
0
0
0
Good
then
2 AL
then 0 AL
Alarms can be reset even if the unit is running. This means that
an alarm can be reset without stopping the machine.
In the event of a power supply interrupt, the unit restarts
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.
6.4 - Alarm codes
The following list gives a complete description of each alarm
code and its possible cause.
32
ALARM CODE DESCRIPTIONS
Alarm Description
Why was this alarm
Action taken
code
generated?
by the control
Reset type
Probable cause
Thermistor or wiring fault
1
Evaporator entering fluid thermistor failure
Thermistor outside range -40 to 118°C
Unit shut down
Automatic
2
Evaporator leaving fluid thermistor failure
Thermistor outside range -40 to 118°C
Unit shut down
Automatic
Ditto
3
Condenser entering fluid thermistor failure
Thermistor outside range -40 to 118°C
None, simple message
Automatic
Thermistor or wiring fault or cable/wire
damaged
4
Condenser leaving fluid thermistor failure
Thermistor outside range -40 to 118°C
None in cooling mode
Automatic
Unit shut down in heating mode
Ditto
5
Heat reclaim condenser entering fluid thermistor failure
Thermistor outside range -40 to 118°C
None, simple message
Automatic
Ditto
6
Heat reclaim condenser leaving fluid thermistor failure
Thermistor outside range -40 to 118°C
None, simple message
Automatic
Ditto
7
Discharge gas thermistor failure, circuit A
Thermistor outside range -40 to 118°C
Circuit A shut down
Automatic
Thermistor solenoid, motor cooling or
wiring fault or high discharge temperature
8
Discharge gas thermistor failure, circuit B
Thermistor outside range -40 to 118°C
Circuit B shut down
Automatic
Ditto
9
Motor sensor compressor A1
Thermistor outside range -40 to 118°C
Compressor A1 shut down
Automatic
Thermistor, solenoid, motor cooling
or wiring fault
10
Motor sensor compressor A2
Thermistor outside range -40 to 118°C
Compressor A2 shut down
Automatic
Ditto
11
Motor sensor compressor B1
Thermistor outside range -40 to 118°C
Compressor B1 shut down
Automatic
Ditto
12
Motor sensor compressor B2
Thermistor outside range -40 to 118°C
Compressor B2 shut down
Automatic
Ditto
13
External 0-10 V dc signal fault
Signal ouside range
1- Loadshed: not used
2- Demand limit: deactivated
Automatic
Defective input or wiring fault
14
Discharge pressure transducer failure, circuit A
Measured signal = 0V dc
Circuit A shut down
Automatic
Defective transducer, wiring fault
15
Discharge pressure transducer failure, circuit B
Measured signal = 0V dc
Circuit B shut down
Automatic
Ditto
16
Suction pressure transducer failure, circuit A
Measured signal = 0V dc
Circuit A shut down
Automatic
Ditto
17
Suction pressure transducer failure, circuit B
Measured signal = 0V dc
Circuit B shut down
Automatic
Ditto
18
Oil pressure transducer failure, compressor A1
Measured signal = 0V dc
Compressor A1 shut down
Automatic
Ditto
19
Oil pressure transducer failure, compressor A2
Measured signal = 0V dc
Compressor A2 shut down
Automatic
Ditto
20
Oil pressure transducer failure, compressor B1
Measured signal = 0V dc
Compressor B1 shut down
Automatic
Ditto
21
Oil pressure transducer failure, compressor B2
Measured signal = 0V dc
Compressor B2 shut down
Automatic
Ditto
22
Economizer A1 transducer failure
Measured signal = 0V dc
Circuit A shut down for unit
with economizer. Otherwise
compressor A1 shut down.
Automatic
Ditto
23
Economizer A2 transducer failure
Measured signal = 0V dc
Compressor A2 shut down
Automatic
Ditto
24
Economizer B1 transducer failure
Measured signal = 0V dc
Circuit B shut down for unit
with economizer. Otherwise
compressor B1 shut down.
Automatic
Ditto
25
Economizer B2 transducer failure
Measured signal = 0V dc
Compressor B2 shut down
Automatic
Ditto
26
Transducer supply defective
Ref. voltage supplied by main board
outside range 4,4 V-5,5 V
Unit shut down
Automatic
Basic board failure or wiring fault
27
Evaporator liquid level sensor failure, circuit A
Sensor reading outside range
-40 to 118°C
Circuit operates, but EXV
control based on discharge
superheat
Automatic
Open thermistor, liquid level sensor
defective, wiring fault
28
Evaporator liquid level sensor failure, circuit B
Sensor reading outside range
-40 to 118°C
Ditto
Automatic
Ditto
29
Loss of communication with CPM A1 board
CPM A1 board does not respond
Compressor A1 shut down
Automatic
Bus wiring fault, incorrect address
or defective board
30
Loss of communication with CPM A2 board
CPM A2 board does not respond
Compressor A2 shut down
Automatic
Ditto
31
Loss of communication with CPM B1 board
CPM B1 board does not respond
Compressor B1 shut down
Automatic
Ditto
32
Loss of communication with CPM B2 board
CPM B2 board does not respond
Compressor B2 shut down
Automatic
Ditto
33
Loss of communication with 4xDO #1 board
4xDO board associated with
CPM A1 does not respond
Circuit A shut down
Automatic
Ditto
34
Loss of communication with 4xDO #2 board
4xDO board associated with
CPM A2 does not respond
Compressor A2 shut down
Automatic
Ditto
35
Loss of communication with 4xDO #3 board
4xDO board associated with
CPM B1 does not respond
Circuit B shut down
Automatic
Ditto
36
Loss of communication with 4xDO #4 board
4xDO board associated with
CPM B2 does not respond
Compressor B2 shut down
Automatic
Ditto
37
Loss of communication with EXV board, circuit A
4xDO board controlling EXV
circuit A does not respond
Circuit A shut down
Automatic
Ditto
38
Loss of communication with EXV board, circuit B
4xDO board controlling EXV
circuit B does not respond
Circuit B shut down
Automatic
Ditto
39
Loss of communication with fan board #1
4xDO board controlling the first four
fan stages does not respond
Unit shut down if number of
fan stages by circuit is lower
than three. Otherwise circuit A
shut down.
Automatic
Ditto
40
Loss of communication with fan board # 2
4xDO board controlling the fan
stages of circuit B does not respond
Circuit B shut down
Automatic
Ditto
41
Loss of communication with 4xAI - 2xAO #1 board
Analogue card does not respond
Unit shut down if operating in
Automatic
heating mode or using the speed
controller or water valve. Otherwise simple message. EXV
controls superheat, and no longer
controls based on level indicator
Ditto
42
Loss of communication with 4xAI - 2xAO #2 board
Analogue card does not respond
Unit shut down if economizer
is used. Otherwise only
compressors A1 + B1 are
shut down.
Automatic
Ditto
43
Loss of communication with 4xAI - 2xAO #3 board
Analaogue board does not respond
Shut down compressor A2 & B2 Automatic
Ditto
44
Discharge pressure circuit A too high
SCT>loadshed threshold. Max. satur.
condensing pressure (mct_sp)
if only one capacity stage remains
in operation.
Circuit A shut down
Automatic in the
10 minutes that
follow
Transducer/high pressurestat or fan circuit
defective, condenser water flow restricted.
condenser entering water or air temperature
too high
45
Discharge pressure circuit B too high
SCT>loadshed threshold. Max. satur.
condensing pressure (mct_sp)
if only one capacity stage remains
in operation.
Circuit B shut down
Automatic in the
10 minutes that
follow
Ditto
33
Alarm Description
Why was this alarm
Action taken
code
generated?
by the control
Reset type
Probable cause
46
Oil solenoid failure, compressor A1
Oil pressure differential >17kPa
during the period following pump
start-up and before opening of the
oil solenoid (see prelubrication)
Compressor A1 not
authorised to start
Manual
Oil valve defective
47
Oil solenoid failure, compressor A2
Ditto
Compressor A2 not
authorised to start
Manual
Ditto
48
Oil solenoid failure, compressor B1
Ditto
Compressor B1 not
authorised to start
Manual
Ditto
49
Oil solenoid failure, compressor B2
Ditto
Compressor B2 not
authorised to start
Manual
Ditto
50
Pre-start oil pressure, compressor A1
Oil pump does not sufficiently
increase the pressure during several
prelubrication cycles
Compressor A1 cannot
start
Manual
Low oil level, oil pump, oil solenoid or
oil transducer failure
51
Pre-start oil pressure, compressor A2
Oil pump does not sufficiently
increase the pressure during several
prelubrication cycles
Compressor A2 cannot
start
Manual
Ditto
52
Pre-start oil pressure, compressor B1
Oil pump does not sufficiently
increase the pressure during several
prelubrication cycles
Compressor B1 cannot
start
Manual
Ditto
53
Pre-start oil pressure, compressor B2
Oil pump does not sufficiently
increase the pressure during several
prelubrication cycles
Compressor B2 cannot
start
Manual
Ditto
54
Oil level circuit A low
Oil level control contact open
during operation
Circuit A shut down
Manual
Oil level detector defective, oil quantity
insufficient
55
Oil level circuit B low
Oil level control contact open
during operation
Circuit B shut down
Manual
Ditto
56
Low saturated suction temperature, circuit A
SST under defrost theshold*
for 3 minutes
Circuit A shut down
Manual
Low refrigerant charge, filter drier
obstructed, expansion valve and transducer
defective, low water flow, low evaporator
water temperature
57
Low saturated suction temperature, circuit B
SST under defrost threshold*
for 3 minutes
Circuit B shut down
Manual
Ditto
58
High saturated suction temperature, circuit A
After 90 seconds of operation
if SST > 12,8°C & EXV < 1%
Circuit A shut down
Manual
Expansion valve, liquid level sensor or
transducer defective, high evaporator temp.
59
High saturated suction temperature, circuit B
After 90 seconds of operation
if SST > 12,8°C & EXV < 1%
Circuit B shut down
Manual
Ditto
60
Low discharge superheat, circuit A
Superheat <2,8 K for 10 minutes
Circuit A shut down
Manual
Thermistor, transducer, EXV or economizer
defective
61
Low discharge superheat, circuit B
Superheat <2,8 K for 10 minutes
Circuit B shut down
Manual
Ditto
62
Max. oil pressure difference, compressor A1
(Discharge pressure - oil pressure)
>340 kPa for more than 6 seconds
Compressor A1 shut down
Manual
Obstructed oil filter, oil solenoid or shut-off
valve blocked, or manual oil valve closed
63
Max. oil pressure difference, compressor A2
(Discharge pressure - oil pressure)
>340 kPa for more than 6 seconds
Compressor A2 shut down
Manual
Ditto
64
Max. oil pressure difference, compressor B1
(Discharge pressure - oil pressure)
>340 kPa for more than 6 seconds
Compressor B1 shut down
Manual
Ditto
65
Max. oil pressure difference, compressor B2
(Discharge pressure - oil pressure)
>340 kPa for more than 6 seconds
Compressor B2 shut down
Manual
Ditto
66
Loss of commuincation with System Manager
The unit is controlled by a System
Manager (Flotronic or Chiller) and
communication with this module is
lost for more than two minutes
Unit returns to autonomous
operating mode
Automatic
Defective CCN BUS CCN wiring or
system module failure
67
Loss of communication with master or slave unit
The master/slave link is broken due
to a loss of communication between
the two units for more than 2 minutes
Unit returns to autonomous
operating mode
Automatic
Defective CCN BUS CCN wiring or loss of
supply
68
Low oil pressure compressor A1
Oil pressure differential below the
setpoint (dynamically calculated)
for 15 seconds
Compressor A1 shut down
Manual
Low condenser air or water temperature,
oil filters obstructed, oil valve blocked,
oil solenoid and oil pressure transducer
defective
69
Low oil pressure compressor A2
Oil pressure differential below the
setpoint (dynamically calculated)
for 15 seconds
Compressor A2 shut down
Manual
Ditto
70
Low oil pressure compressor B1
Oil pressure differential below oil
setpoints 1 or 2 (see alert criteria
for low oil pressure and setpoint)
Compressor B1 shut down
Manual
Ditto
71
Low oil pressure compressor B2
Oil pressure differential below the
setpoint (dynamically calculated)
for 15 seconds
Compressor B2 shut down
Manual
Ditto
72
Evaporator frost protection
Evaporator EWT or LWT
below defrost setpoint
Unit shut down. Evaporator
pump and if applicable heater
start-up, if unit has shut down
air-cooled units)
Automatic if the
same alarm has
not tripped the
same day
Defective thermistor, low water flow
73
Condenser frost protection, circuit A
For water-cooled units and
fluid type = water, if
SCT<1,1°C
Unit shut down. Condenser
pump start-up, if unit has
shut down
Automatic
Discharge pressure transducer defective,
refrigerant leak or low condenser water
temperature
74
Condenser frost protection, circuit B
For water-cooled units and
fluid type = water, if
SCT<1,1°C
Unit shut down. Condenser
pump start-up, if unit has
shut down
Automatic
Ditto
75
Evaporator water flow control failure
1 - Control not closed, before end
Unit shut down. Pump
of the start-up delay or open
shut down.
during operation
2 - If shut-down control is active
(accessible by Carrier Service) and control is closed, when pump is deactivated
Manual
Evaporator pump control or water flow
switch failure
76
Condenser water flow loss/thermostat box
Water flow switch (water-cooled units)
not closed during the minute after
start-up or open thermostat box, due to
high temperature (air-cooled units)
Unit shut down
Manual
Condenser pump, low water flow, water
flow switch, high thermostat box
temperature or thermostat fault on
air-cooled units
77
Unit emergency stop
CCN command received to
shut down the unit
Unit shut down
CCN/Automatic
Network command
34
ALARM CODE DESCRIPTIONS (cont.)
Alarm Description
Why was this alarm
Action taken
code
generated?
by the control
Reset type
Probable cause
82
Communication loss with the 4 x DO heat reclaim board
4 x DO board does not respond
Unit shut down
Automatic
Defective bus wiring, incorrect address or
defective board
83
Heat reclaim mode fault, circuit A
1. Interlock not closed 1 minute after
condenser pump start-up or open
during heat reclaim operation
2. More than two consecutive
pumpdown sequences not successful.
Circuit A remains in cooling
mode
Manual
1. Water flow switch defective.
2. Leak or heat reclaim shutoff or drain
solenoid valve open.
84
Heat reclaim mode fault, circuit B
Ditto
Circuit B remains in cooling
mode
Manual
Ditto
Alarm code
1xx
Defect compressor A1
See CPM subcodes below
See CPM subcodes below
Manual
2xx
Defect compressor A2
See CPM subcodes below
See CPM subcodes below
Manual
3xx
Defect compressor B1
See CPM subcodes below
See CPM subcodes below
Manual
4xx
Defect compressor B2
See CPM subcodes below
See CPM subcodes below
Manual
CPM subcodes (XX)
01
High pressurestat tripped
HPS port to CPM module open
Compressor shut down
Manual
Lack of condenser water flow. Condenser
valve blocked, fan circuit fault, high
condenser entering air or water temperature
02
No motor current
CPM module shows less than 10%
of the MTA for more than 3 seconds
Compressor shut down
Manual
Power supply interrupted, fuse(s) blown,
wiring fault, core defective
03
Current imbalance >10%
CPM shows the voltage imbalance
between phases as more than 10%
for 25 minutes
Compressor shut down, if
threshold alarm is validated.
Otherwise simple message.
Manual, if threshold Loss of power supply, wiring fault,
alarm is validated. loose terminal, core defective
Otherwise
automatic reset.
04
Current imbalance >18%
CPM shows the voltage imbalance
between phases as more than 18%
for 25 minutes
Compressor shut down, if
threshold alarm is validated.
Otherwise simple message.
Manual, if threshold Poor power supply, loose terminal,
alarm is validated. core defective
Otherwise
automatic reset.
05
Current drop in one phase
CPM shows the current imbalance
between phases as more than 30%
for 1.8 seconds
Compressor shut down
Manuel
Motor fault, wiring fault
06
High motor current
CPM detects high current, based
on MTA rating
Compressor shut down
Manuel
Operation outside the compressor capacity.
Configuration block badly perforated, motor
07
Ground current fault
CPM detects ground current
(2.5 +2/- 0 amps)
Compressor shut down
Manuel
Ground current fault on motor winding,
wiring fault
08
Voltage imbalance >3%
CPM shows the voltage imbalance
between phases as more than 3%
for 25 minutes
Compressor shut down, if
threshold alarm is validated.
Otherwise simple message.
Manual, if threshold Compressor fault, power supply imbalance,
alarm is validated wiring fault, loose terminal
Otherwise
automatic reset.
09
Voltage imbalance >7%
CPM shows the voltage imbalance
between phases as more than 3%
for 25 minutes
Compressor shut down, if
threshold alarm is validated.
Otherwise simple message.
Manual, if threshold Ditto
alarm is validated.
Otherwise
automatic reset.
11
Voltage phase reversal
CPM detects phase reversal in
the incoming power supply
The compressor does not start
Manual
Supply phases or cables reversed,
reference voltages reversed on the CPM
board, after replacement
12
Contactor failure
CPM detects 10% of the MTA
for 10 seconds after shutdown
of the compressor contactor.
Oil solenoid still has supply.
Unit shut down
Manual
Defective/blocked contactor
13
Current phase reversal
CPM detects a current phase reversal
via the core
Compressor shut down
Manual
Supply phases or cables reversed,
core wiring reversed after replacement
14
High motor temperature
CPM detects high motor
temperature, if temperature is
higher than 110°C for 10 seconds
Compressor shut down
Manual
Solenoid, cooling motor defect, low
refrigerant charge. Wiring, motor
temperature sensor or CPM board fault
15
Motor thermistor open
CPM detects an open circuit at
the motor temperature thermistor
Compressor shut down
Manual
Wiring fault, thermistor or board defective
16
Configuration block fault
CPM detects a reading fault at
the block
Compressor shut down
Manual
Configuration block on CPM board badly
perforated or badly placed. Defective board.
17
Thermistor short-circuited
CPM detects a short circuit at
the motor temperature thermistor
Compressor shut down
Manual
Wiring fault, thermnistor or board defective
fault
Legend:
* Defrost threshold = 1,1°C for water or for the lowest cooling setpoint less 4,4°C for brine or low brine.
CPM: Compressor protection module
FSM: Flotronic System ManagerTM
CSM: Chiller System Manager
MTA: Compressor Must Trip Amperes
35
Order No. 13056-76, 03 1999. Supersedes order No.: 13056-76, April 1998
.
Manufacturer reserves the right to change any product specifications without
notice.
Manufactured by: Carrier S.A., Montluel, France.
Printed in the Netherlands on totally chlorine-free paper.