Installation & Maintenance Data
IM 613-2
Group: Unit Ventilator
Part No.: 106102102
Date: May 2000
MicroTech®
Unit Ventilator Controller
J2
J1
J5
J3
J4
R 5 4 3 2 1 0
DIGITAL INPUT
A
89
20
50 5
10
15
65
75
0
100
%
MINIMUM OA
POSITION
HI
COOLING SETPOINT IS
FACTORY SET 6°F ABOVE
HEATING SETPOINT
75
20
0
°F
UNOCCUPIED
OFFSET
60
BCD
EF 01
EF 01
4
23 5
BCD
J5
70
10
40
G S1 S0
IN 1. 0
J4
4
23 5
30
G S G S G S G S G S G S G S G S
IN 13 IN 12 IN 7 IN 6 IN 5 IN 4 IN 3 IN 2
J3
A
6
J2
67
2 3 4 5
COMM A
89
1
J1
67
1 2 3
COMMB
LO
NETWORK
ADDRESS
80
°F
HEATING SETPOINT
File E159169
Model 325
MicroTech®
325 Controller
C®
This devise complies with Part 15 of the FCC rules.
Operation is subject to the following 2 conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including
interference that may cause undesired operation.
Part No. 107627201
J6
LED
G 0
J6
J7
RELAY OUT
H 1 2 3 4 5 6
J8
J9
AUX OUT
V 9 10
7 8
J7
J8
STATUS
STATUS
POWER
POWER
PWR
G 24V
J9
Used with AAF-HermanNelson Models AVS, AVV, AVR, AHF,
AHV, AHR, AED, AEQ, AZS, AZQ, AZR, ARQ, ERQ
®
HermanNelson
©2000 AAF-HermanNelson
Table of Contents
Introduction
.................................. 3
Software ID
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Component Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setpoint Adjustment Potentiometers . . . . . . . . . . . . . .
Status LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hex Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Ports . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sensors . . . . . . . . . . . . . . . . . . . . . . . . .
Actuators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
5
5
5
5
5
6
6
6
Pre-Start
.................................
Required Tools and Literature . . . . . . . . . . . . . . . . . .
Unit Ventilator Identification . . . . . . . . . . . . . . . . . . . .
Field Wiring Check . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setpoint Initialization . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
11
11
12
Start-up
.................................
Stand-alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master/Slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Network
.................................
13
13
13
15
Standard Control Features . . . . . . . . . . . . . . . . . . . . . . .
Control Temperature . . . . . . . . . . . . . . . . . . . . . . . . . .
Change and Step-&-Wait Algorithms . . . . . . . . . . . . . .
Compressor Short-Cycle Protection . . . . . . . . . . . . . .
Low Ambient Lockout . . . . . . . . . . . . . . . . . . . . . . . . .
Random Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed Reversing Valve De-energization . . . . . . . . .
Emergency Heat . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrost
..................................
Alarm Monitoring & Controlled Response . . . . . . . . . .
6
6
6
7
7
7
7
7
7
7
Diagnostics & Service . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Monitoring & Control . . . . . . . . . . . . . . . . . . . .
Fault Code Interpretation . . . . . . . . . . . . . . . . . . . . . .
Clearing Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
17
17
17
17
Factory Configured Options . . . . . . . . . . . . . . . . . . . . .
Communication Type . . . . . . . . . . . . . . . . . . . . . . . . . .
ASHRAE Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Room Temperature Sensor . . . . . . . . . . . . . . . . . . . . .
Remote Room Setpoint Adjustment . . . . . . . . . . . . . .
Tenant Override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Day-Night Changeover . . . . . . . . . . . . . . . . . . . . . . . .
Ventilation Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Fan Interlock . . . . . . . . . . . . . . . . . . . . . . . . .
8
8
9
9
9
9
9
9
9
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PC Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UVC Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . .
Test Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UVC Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve & Damper Actuator Calibration Procedures . .
20
20
21
26
28
29
List of Illustrations
Figures:
1. MicroTech Unit Ventilator Controller . . . . . . . . . . . . . . . 4
2. Hex Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Software ID Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Digital Input Wiring Example . . . . . . . . . . . . . . . . . . . . 22
4a. Auxiliary Output Wiring Example . . . . . . . . . . . . . . . . 22
5. Relay Output Wiring Example . . . . . . . . . . . . . . . . . . . 23
6. Barber-Colman Actuator Position
Feedback Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
IM 613 / Page 2 (Rev. 5/00)
Tables:
1. Status LED Indication . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Hexadecimal to Decimal Conversion Guide . . . . . . . . 5
3. Alarm & Controlled Response Feature Availability . . 7
4. Programs and Software Models . . . . . . . . . . . . . . . . 10
5. Model-Specific Unit Ventilator Installation Literature 11
6. Program-Specific Sequence of Operation Literature 11
7. Network UVC Default Setpoints . . . . . . . . . . . . . . . . 12
8. Network Communications Port Terminal
Voltage Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9. Alarm and Fault Code Summary . . . . . . . . . . . . . . . 18
10. RS-232 Communications Cable Terminations . . . . . 21
11. Inputs and Outputs for Program UV1*** Units . . . . . 22
12. Inputs and Outputs for Program UV2*** Units . . . . . 23
13. Inputs and Outputs for Program UV3*** Units . . . . . 23
14. Inputs and Outputs for Program UV4*** Units . . . . . 24
15. Inputs and Outputs for Program UV5*** Units . . . . . 24
16. Inputs and Outputs for Program UV6*** Units . . . . . 25
17. Inputs and Outputs for Program UV7*** Units . . . . . 25
18. Thermistor Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Introduction
Certified Drawing
This manual provides information pertaining to the
MicroTech Unit Ventilator Controller (UVC) as applied in the
AAF-HermanNelson Unit Ventilator product line. It should be used
in conjunction with the separate installation (Bulletin
No. OM101 through OM107) and sequence of operation
literature (see Tables 5 and 6).
CAUTION
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with
the instructions, may cause harmful interference to radio communications. It has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a residential environment. AAF-HermanNelson
disclaims any liability resulting from any interference or for the correction thereof.
CAUTION
This MicroTech controller contains static electricity sensitive components. A static discharge while handling electronic
circuit boards may cause damage to the components. To prevent such damage during service involving board replacement,
discharge any static charge by touching grounded bare metal inside the unit before performing any service work.
WARNING
If the unit ventilator is to be used for temporary heating or cooling, the unit must first be properly commissioned. Failure to
comply with this requirement will void the warranty.
WARNING
This MicroTech control panel is designed to be stored and operated in temperatures from 32°F to 140°F and in relative
humidity up to 95% (noncondensing).
IM 613 / Page 3 (Rev. 5/00)
General Description
The MicroTech Unit Ventilator Controller (UVC) is a microprocessor-based controller designed to provide sophisticated control of
an economizer-equipped AAF-HermanNelson unit ventilator. In
addition to providing normal operating control, the MicroTech UVC
provides alarm monitoring and alarm-specific component
shutdown if critical system conditions occur.
the customer. The UVC can be wired and programmed to operate as a stand-alone controller, as a master or slave
controller, or as a MicroTech network controller.
Each UVC is factory wired and factory programmed for the specific unit ventilator model and configuration options ordered by
The MicroTech Unit Ventilator Controller (UVC) is shown in
Figure 1.
Communication ports allow networking capability and
access to any UVC from an IBM compatible personal computer
(PC) equipped with Monitor software.
Component Data
Figure 1. MicroTech Unit Ventilator Controller
Communication
Ports
Digital Inputs
J2
J1
Analog Inputs
J5
J3
J4
J5
EF 01
A
89
50 5
15
65
75
0
100
%
MINIMUM OA
POSITION
HI
COOLING SETPOINT IS
FACTORY SET 6°F ABOVE
HEATING SETPOINT
75
20
0
°F
UNOCCUPIED
OFFSET
60
BCD
J4
70
EF 01
4
23 5
20
10
Unoccupied
Offset Pot
Heating
Setpoint Pot
J3
10
40
G S1 S0
IN 1. 0
A
J2
30
G S G S G S G S G S G S G S G S
IN 13 IN 12 IN 7 IN 6 IN 5 IN 4 IN 3 IN 2
4
23 5
Minimum OA
Damper
Position Pot
R 5 4 3 2 1 0
DIGITAL INPUT
BCD
J1
6
67
2 3 4 5
COMM A
89
1
67
1 2 3
COMMB
LO
NETWORK
ADDRESS
80
°F
HEATING SETPOINT
File E159169
Model 325
MicroTech®
325 Controller
EOS + S/N tag
C®
Software ID tag
This devise complies with Part 15 of the FCC rules.
Operation is subject to the following 2 conditions:
(1) This device may not cause harmful interference.
(2) This device must accept any interference received, including
interference that may cause undesired operation.
Part No. 107627201
J6
LED
G 0
J7
RELAY OUT
H 1 2 3 4 5 6
J8
J9
AUX OUT
V 9 10
7 8
STATUS
POWER
PWR
G 24V
Electro-Mechanical
Relays
J6
Remote Status
LED Output
IM 613 / Page 4 (Rev. 5/00)
Hex Switches
J7
Relay Outputs
J8
Auxiliary
Outputs
(TRIAC)
STATUS
Status LED
POWER
J9
Power Supply LED
Microprocessor
The UVC contains a microprocessor that is preprogrammed with
the software required to monitor and control the unit. It receives
input data from as many as 20 inputs (analog or digital) and sends
commands to as many as 8 outputs (electromechanical relays).
(There are 2 additional solid-state relay “aux” outputs which are
not used for standard unit ventilator configurations.) The quantities
and types of inputs and outputs are dependent on the unit ventilator model type and configuration options. All input and output
connections to the UVC are made using insulation
displacement type (IDC) terminal connectors.
The UVC uses field-adjustable setpoints and fixed,
preprogrammed parameters to maintain unit control. (Many of
the preprogrammed parameters can be adjusted with a PC
equipped with Monitor software.)
Setpoint Adjustment Potentiometers
There are three setpoint adjustment potentiometers (pots) on
the UVC:
Table 1. Status LED Indication
Status LED State
Certified
Drawing
Indication
On Continually
Occupied Mode
On 1⁄2 sec./ Off 51⁄2 sec.
Unoccupied Mode
On 51⁄2 sec./ Off 1⁄2 sec.
Tenant Override Mode
Flashing*
Alarm Condition
On 3 sec. / off 3 sec.**
Calibration
*
Refer to Table 9 in the “Alarm Monitoring & Control” section of this manual.
**
Calibration of OA Damper, F&BP Damper, and/or valve actuators will be
completed within approximately 5-min after power-on.
on-board status LED. If used, the remote LED is connected to
the UVC at the terminal section labeled “LED.”
Power LED
The green, on-board power LED indicates microprocessor “on”
status. After applying power to the unit, the power LED should
illuminate continuously. For more information, refer to “Test
Procedures” in the “Service Information” section of this manual.
• Minimum outdoor air damper position pot
• Heating setpoint pot
Hex Switches
• Unoccupied offset adjustment pot
The UVC includes two hex (hexadecimal) switches that may need
to be set. The HI and LO hex switches are shown in Figures 1
and 2. Table 2 provides a hex-to-decimal conversion guide.
Note: On slave and network controllers, these three setpoint
values are received via network communications, and the
pot settings are ignored. On slave controllers only, the
pot settings are used when communications are lost.
Therefore, it is recommended that appropriate “default”
pot settings be set for slave units.
Minimum Outdoor Air Damper Position Pot
The minimum position pot defines the minimum outdoor air (OA)
damper position. The OA damper is typically held at its minimum
position when cooling is not required or when the OA temperature
is not suitable for free cooling. Refer to the sequence of operation
document provided with your unit for more detailed
information.
Heating Setpoint Pot
The heating setpoint pot adjusts both the occupied cooling and
heating setpoints. The room occupied heating setpoint is shown
on the UVC faceplate. The room occupied cooling setpoint is
calculated by adding the deadband value to the heating setpoint
(deadband default = 6°F).
Unoccupied Offset Adjustment Pot
The unoccupied offset pot sets the offset value used to determine the unoccupied heating (or night setback) and unoccupied
cooling (or night setup) setpoints. The night setback setpoint is
calculated by subtracting the offset value from the occupied
heating setpoint. The night setup setpoint is calculated by adding
the offset value to the occupied cooling setpoint.
Status LED
An amber, on-board status LED aids in diagnostics by indicating
the unit ventilator operating mode and alarm conditions. If there are
no current alarm conditions, the LED will indicate the unit operating
mode as shown in Table 1. If there are one or more alarm conditions present, the LED will flash in a specific sequence to indicate a particular alarm condition. For more information on alarms,
refer to the “Alarm Monitoring & Control” section of this manual.
A remote status LED is provided with all optional wall- mounted
temperature sensor packages. It has the same function as the
Figure 2. Hex Switches
A “hex switch setting” is defined as the HI switch digit followed by
the LO switch digit. For example, a hex switch setting of 2F would
have the HI switch set to “2” and the LO switch set to “F.”
Stand-alone Units
On compressor-equipped units (self-contained or split system),
the hex switch setting defines the random start delay period. Each
unit on a common circuit or time clock should have a different
hex switch setting to ensure that multiple units do not start
simultaneously. The settings may be between 01 and 3F.
If the unit ventilator has no compressor, leave the hex switch
setting at 01.
Master, Slave and Network Units
The hex switch setting defines the controller’s network address.
(If the master, slave or network unit has a compressor, the
random start delay is also defined by the hex switch setting.) For
more information on master/slave addressing, refer to “Master/
Slave” in the “Start-up” section of this manual. For more
information on MicroTech network addressing, refer to the
MicroTech Network Master Panel installation bulletin.
Table 2. Hexadecimal to Decimal Conversion Guide
HI Hex
Digit
*
LO Hex Digit
0
1
2
3
4
5
6
7
8
9
A
0
0* 1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
B
C
D
E F
1
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
2
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
3
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
Hex switch setting 00 has a special purpose. It should not be used for
normal operation.
IM 613 / Page 5 (Rev. 5/00)
Communication Ports
Actuators
The UVC has two communication ports: Comm A and Comm B.
Following are brief descriptions of each communication port’s
function. For further information, refer to the “Service
Information” section of this manual.
The UVC uses hydraulic, spring return, floating control actuators
with position feedback for valve and damper modulation. These
actuators are controlled using the “Change” and “Step-and-Wait”
control algorithms. All cooling valves are normally closed, and all
heating valves (including “2-pipe” hot/chilled water) are normally
open. Outside air dampers are normally closed, and face and
bypass (F&BP) dampers are normally open to the coil face.
Stand-alone and Network Units
Comm B is for MicroTech network communications to the Local
Master Controller using an RS-485 format. (Comm B is configured
this way in a stand-alone unit, but not used.) Comm A is for
communications to an IBM compatible PC using an RS-232 format.
Master/Slave Units
Communications between master and slave UVC’s is done using
an RS-485 format. On the master unit, Comm B is used for
communications to the slaves, and Comm A is not used. On a
slave unit, Comm B is used for communications to the master,
and Comm A is available for communications to an IBM
compatible PC using an RS-232 format.
On some units equipped with F&BP dampers, a spring
return, two-position “end-of-cycle” (EOC) valve is used to prevent overheating or overcooling when the damper is in the full
bypass position. Cooling EOC valves are normally closed, and
heating EOC valves (including “2-pipe” hot/chilled water) are normally open.
Temperature Sensors
The MicroTech UVC uses negative temperature coefficient (NTC)
thermistors for temperature sensing. A thermistor chart, which
provides voltage-to-temperature and resistance-to-temperature
conversion data, is included in the “Service Information” section
of this manual (Table 18).
Standard Control Features
The following are standard MicroTech UVC control features as
applicable to the various unit ventilator model types:
•
Control Temperature
•
Change and Step-&-Wait control algorithms
•
Compressor short-cycle protection
•
Low ambient lockout
•
Random start
•
Delayed reversing valve de-energization
•
Emergency heat
•
Defrost
•
Alarm monitoring & controlled response
Control Temperature
All unit ventilators are designed to control the room (or zone)
temperature. In order to maintain more stable room temperature
control, the UVC uses the concept of a “Control Temperature.”
Depending on the unit ventilator model, configuration, and
current mode of operation, the Control Temperature could be
either (1) the actual room temperature or (2) a weighted value
equal to 19/20 room temperature and 1/20 discharge air temperature.
Throughout the remainder of this manual, “room temperature”
and “Control Temperature” will be assumed to be synonymous.
For further information, refer to the sequence of operation
document provided with your unit (see Table 6).
Change and Step-&-Wait Algorithms
The “Change” and “Step-and-Wait” algorithms work together in a
IM 613 / Page 6 (Rev. 5/00)
two-stage process to modulate actuators (valves or dampers) in
the unit ventilator. This control process enables the UVC to
maintain tight space temperature control with no overshoot.
There are several Change and Step-and-Wait parameters that
are factory set and adjustable only with a PC equipped with
Monitor software. For most applications, the factory-set
parameters will provide the best control. It is recommended that
these values not be changed.
Following is a brief description of the Change and Step-and-Wait
functions. For additional information, refer to the MicroTech Unit
Ventilator Controller Monitor Program User’s Manual.
Change
The Change function changes the valve or damper position
setpoint in response to the deviation of the room temperature
from its setpoint (offset). The amount of actuator-position setpoint
change varies and is dependent on the amount of room
temperature setpoint offset.
The Change algorithm is executed on a factory-set, periodic basis.
Step-and-Wait
The Step-and-Wait function causes the valve or damper to open
or close as required to maintain the Change function’s calculated
position setpoint. The “step” period is the amount of time the
electric actuator is driven either open or closed, and the “wait”
period is the amount of time the actuator holds its position. The
“step” and “wait” periods vary and are dependent on the amount
of actuator-position setpoint offset.
The Step-and-Wait algorithm is executed on a periodic
basis. This period is a factory-set constant that is equal to the
sum of the “step” and “wait” periods described above.
Compressor Short-Cycle Protection
All compressor-equipped unit ventilator models (self-contained
or split system) include compressor short-cycle protection.
When a compressor is energized, it will remain energized for at
least 2 minutes before the temperature control sequence will be
allowed to de-energize it. An alarm condition can override this
“minimum-on” timer and stop the compressor if necessary.
When a compressor is de-energized, it will remain
de-energized for at least 3 minutes before the temperature
control sequence will be allowed to energize it again.
Low Ambient Lockout
Except for the water source heat pump (WSHP) models, all
compressor-equipped unit ventilators (self-contained or split
system) include compressor low ambient lockout protection.
This feature will prevent compressor operation when the unit is in
the cooling mode and the outdoor air temperature is below 59°F.
ASHP Units Only: Note that the emergency heat switch (SW5)
and
defrost control
contacts are wired in parallel and use the
Certified
Drawing
same UVC digital input (DI-3). The emergency heat switch
provides a momentary contact closure and the defrost control
provides a maintained contact closure. Therefore, do not hold
the emergency heat switch down or the unit may enter the
defrost mode instead of the desired emergency heat mode.
Defrost
The AE air source heat pump (ASHP) unit ventilator models have
a defrost cycle which prevents frost from building up on the
outdoor coil when the unit is operating in the heating mode.
An external defrost control provides a maintained contact
closure to the UVC when defrost is required.
When the unit is in the defrost mode, the following
actions occur:
•
Reversing valve is de-energized (unit enters “cooling” cycle).
•
Electric heat is staged to maintain the room setpoint
regardless of outdoor air temperature.
•
Compressor cannot be de-energized by room temperature
control until defrost mode ends.
Random Start
A random start feature is provided with all compressor-equipped
unit ventilators (self-contained or split system). This feature will
prevent simultaneous compressor start-up that could otherwise
occur after the following events:
• Unit power-up
For further information on the defrost control cycle, refer to
Bulletin No. OM 101, MicroTech Unit Ventilator Controller
Sequences of Operation: Program UV1.
• Unoccupied to occupied changeover
• Brownout condition
Alarm Monitoring & Controlled Response
The compressor start delay can be from 1 to 63 seconds and is
determined by the UVC hex switch setting. For more information,
refer to “Hex Switches” in the “Component Data” section of this
manual.
The MicroTech UVC is capable of sophisticated alarm
monitoring and controlled response functions. Each alarm
(or “fault”) is prioritized, indicated, and responded to with the
appropriate action. If multiple alarms are present, the alarm with
the highest priority is indicated.
Delayed Reversing Valve De-energization
A summary of the available alarm features is shown in Table 3.
For more information, refer to the “Alarm Monitoring &
Control” section of this manual. Following are brief descriptions
of each feature.
All heat pump unit ventilator models have a 60-second (default)
reversing valve de-energization delay feature.
This delay prevents the reversing valve from returning to its
normal (cooling) position for a period of 60 seconds after the
compressor is de-energized when the unit is in the heating mode.
If necessary, an alarm condition can override the 60-second timer
and de-energize the reversing valve with the compressor.
Table 3. Alarm & Controlled Response Feature Availability
Alarm & Controlled Response Feature
Unit Ventilator Model
AE
AZ
AR
Emergency Heat
Sensor Diagnostics (Each Sensor)
•
•
•
AV AH
•
•
All heat pump unit ventilator models that are equipped with
electric heat have an emergency heat feature.
Actuator Feedback Diagnostics
(Each Actuator)
•
•
•
•
•
The emergency heat mode is initiated by depressing the
momentary, unit-mounted emergency heat switch. When the unit
is in the emergency heat mode, the following actions occur:
Brownout Protection
•
•
•
•
•
High Pressure
•
•
•
Low Coil Temperature (DX and/or Water)
•
•
•
•
•
•
Compressor is immediately de-energized and locked out.
Low Refrigerant Temperature (Water Coil)
•
Reversing valve is de-energized after a delay.
•
Electric heat is staged to maintain the room heating
setpoint regardless of outdoor air temperature
(ASHP units) or entering water temperature (WSHP units).
•
Communication Error (Master/Slave Only)
•
•
•
•
•
Change Filter (Network Units Only)
•
•
•
•
•
The unit ventilator may be returned to normal operation by
cycling power to the controller (use fan switch or main
power switch).
IM 613 / Page 7 (Rev. 5/00)
Sensor Diagnostics
If a temperature sensor’s value is out of range, the UVC will
detect it and take the appropriate action. Each sensor fault has a
specific priority, alarm indication, and set of response actions.
Actuator Feedback Diagnostics
The UVC will monitor the position feedback voltages of every
modulating actuator provided with a particular unit ventilator. If a
feedback value is out of range, the UVC will detect it and
discontinue control of that actuator. Each feedback failure fault
has a specific priority and alarm indication.
Brownout Protection
The brownout feature is meant to protect the compressor and
electric heat contactors from low voltage or “brownout” conditions. If the supply voltage to the unit ventilator is below 85% of
the nameplate value, the UVC will detect it, indicate it, and
de-energize the compressor and electric heaters.
High Pressure
If excessive pressure in the refrigeration circuit is detected by the
external pressure switch, the compressor will be de-energized
immediately (hardware wired). The UVC will immediately
de-energize the reversing valve, disable the compressor and
indicate the alarm.
Low Coil Temperature
External thermostats will sense the DX and water coil
temperatures (if present). The UVC will monitor each thermostat,
and if a low coil temperature is detected, alarm indication and
the appropriate action will occur.
Low Refrigerant Temperature (Water Coil)
If the WSHP unit is in the heating mode and the refrigerant
temperature is too low, the UVC will indicate the alarm and
immediately de-energize the compressor and reversing valve.
Communication Error (Master/Slave Units Only)
If a communication error occurs between a slave UVC and its
master, the alarm will be indicated at the slave, and the affected
units will continue operating. For further information, refer to the
description of the master/slave communication type in the
“Factory Configured Options” section of this manual.
Change Filter (Network Units Only)
When the unit ventilator fan run-time exceeds a networkadjustable setpoint, a change filter alarm is indicated locally and
over the MicroTech network.
Factory And/Or Field Configured Options
In addition to the various heating and cooling options, the
AAF-HermanNelson product line provides several factoryconfigured options that affect installation requirements and unit
control. These options are either factory programmed, factory
wired, or both. The model number code string specifies which
options are present in a particular unit ventilator. The following
options are described in this section:
The master controller establishes the following parameters for
itself and for each of its slaves:
•
•
•
•
•
•
•
•
Because each UVC in the zone uses its own room
temperature sensor and a common room temperature setpoint,
even temperature control will be maintained regardless of any
load variation within the zone.
Communication type (stand-alone, master/slave or network)
ASHRAE cycle II
Room temperature sensor (unit or wall mounted)
Tenant override (unit or wall mounted)
Remote room setpoint adjustment
Day-night changeover
Ventilation lockout
Exhaust fan interlock
Communication Type
All Unit Ventilator Controllers can be programmed to operate in
one of the following communication modes:
•
Stand-alone
•
Master/slave
•
MicroTech network
Stand-alone
A stand-alone UVC does not communicate over a network. It is
independent and capable of performing complete room
temperature and ventilation control.
Master/Slave
The master/slave application is designed to provide even
temperature control of a zone containing up to six unit
ventilators. One controller in the zone must be designated and
programmed to be the master, and up to five controllers may be
designated and programmed to be its slaves.
IM 613 / Page 8 (Rev. 5/00)
•
Operating mode (occupied, unoccupied, or tenant override)
•
Minimum OA damper position setpoint
•
Occupied heating and cooling setpoints
•
Unoccupied heating and cooling setpoints
Master: A master UVC is similar to stand-alone UVC. The only
difference is that Comm B of a master controller is used for
master/slave network communications. The minimum position
setpoint, room setpoint, unoccupied offset, operating mode, and
remote setpoint adjustment (if used) must be set at the master.
Slave: A slave UVC receives its operating mode and the above
setpoint information from its master. When communications are
established between a slave and its master, the slave will ignore
its three on-board setpoint potentiometers.
Communication Failure: If the communication link between a
slave and its master fails, the slave UVC will indicate the alarm
and continue to operate using the temperature and minimum
position setpoints defined by its on-board potentiometers. Its
operating mode will be that last received from its master, or if
power is cycled, it will default to occupied.
MicroTech Network
A variety of MicroTech unit and auxiliary controllers can be
interconnected to form a MicroTech network. A MicroTech
network provides a building operator with the capability to perform
advanced equipment control and monitoring from a central or
remote location. A network UVC is a controller that has been
programmed with the software required to operate in a MicroTech network. The following features are provided for each
network UVC over the MicroTech network:
•
Day-night changeover scheduling
•
Heating and cooling setpoint adjustment
•
Minimum OA damper position setpoint adjustment
•
Ventilation lockout
•
Change filter alarm
•
Demand limiting
Communication Failure: If the MicroTech network communication link failures for any reason, the affected UVC will remain
operational. Its operating mode will be that last received over the
network, or if power is cycled, it will default to occupied. Its minimum position, heating, and cooling setpoints will be those last
received over the network, regardless of whether power is cycled.
ASHRAE Cycle
All unit ventilator controllers are factory programmed to follow
ASHRAE II unit ventilator control cycle. The UVC uses the room
temperature sensor to control the heating, ventilating, and
cooling functions of the unit ventilator.
Unit Mounted Tenant Override Switch
The optional unit mounted tenant override switch is factory
Certified
Drawing
installed
and factory
wired.
Wall Mounted Tenant Override Switch
The wall mounted tenant override switch is available with several
of the optional wall sensor packages. The wall sensor package
must be field installed and field wired to the unit ventilator. Refer
to the model-specific unit ventilator installation manual and to
Bulletin No. IM 529, MicroTech Room Temperature Sensors, for
information on wall sensor package installation.
Day-Night Changover
Day-night changeover control is required to change the unit
ventilator operating mode from occupied (default) to unoccupied.
When the unit is in the unoccupied operating mode, the OA
damper is closed, and the night setback and setup room setpoints
are maintained. The fan is energized only when heating or
cooling is required. For further information, refer to sequence of
operation document provided with your unit.
ASHRAE II Cycle
A discharge air temperature sensor is installed in all unit
ventilators. If necessary, the ASHRAE II control algorithm can
override room control and modify the heating, ventilating, and
cooling functions (as available) to prevent the discharge air
temperature from falling below the discharge air low limit setpoint.
The discharge air low limit setpoints and sequences of operation
vary and are dependent on the unit ventilator model and
configuration. For further information, refer to the sequence of
operation document (Bulletin No. OM101 through OM107)
provided with your unit.
Stand-alone and Master Units
The day-night changeover function is provided by a factoryinstalled or field-installed device. The following changeover
options are available:
Room Temperature Sensor
All of the above methods must provide a maintained
contact closure (at DI-2) to place the UVC into the unoccupied
operating mode. When the contacts are open (or if none are
provided), the unit will be in the occupied operating mode. A 115
VAC relay can be separately purchased as a field installed accessory and used to replace the 24 VAC relay if necessary.
A room temperature sensor is required for all unit ventilators. It
may be unit mounted or wall mounted.
Unit Mounted Sensor
The unit mounted room sensor is factory installed and factory
wired. It is located within an aspirating sampling chamber behind
the unit ventilator fan access panel.
Wall Mounted Sensor
There are optional wall sensor packages available. All wall
sensors include a remote status LED. Tenant override, setpoint
adjustment, and bimetal thermometer are optional wall sensor
features that are available in any combination.
The wall mounted sensor must be field installed and field wired
to the unit ventilator. Refer to the model-specific unit
ventilator installation manual and to Bulletin No. IM 629, MicroTech Room Temperature Sensors, for information on wall sensor
package installation.
Remote Room Setpoint Adjustment
The remote setpoint adjustment potentiometer allows the room
setpoint to be adjusted up or down by as much as 3°F. It is
available with several of the optional wall sensor packages, and
it may be used with all except slave-type Unit Ventilator Controllers.
Tenant Override
A unit mounted or wall mounted tenant override switch is
available for use with all except slave-type Unit Ventilator
Controllers. The tenant override switch provides a momentary
contact closure that causes the unit to enter the “tenant override”
operating mode for a set time period (default = 120 minutes).
Except for the fact that it is temporary, the tenant override
operating mode is identical to the occupied operating mode.
•
Relay (factory provided and installed pilot duty 24 VAC relay, coil for field connection)
•
Time clock and holiday switch
•
Manual day-night switch
•
Pneumatic-electric (PE) switch or relay (field supplied &
installed)
Network Units
The day-night changeover function is provided over the MicroTech network. It can be scheduled for every controller on the
network using the UVC Monitor program.
Ventilation Lockout (Default) /Exhaust Fan
Interlock Input
The ventilation lockout input feature provides a means for a field
provided signal to override normal UVC control and close the
outdoor air damper at any time. The exhaust fan interlock input
feature provides a means for a field provided signal to override
normal UVC control and fully opening the outdoor air damper at
any time (all safeties remain in effect and may override this feature as needed for equipment protection). In MicroTech network
applications only, the ventilation lockout feature is provided as
part of the network.
One pilot duty 24 VAC relay is factory provided for either of these
features. The normally open contacts of this relay are factory
wired to the UVC (see “Input/Output Tables”). The coil of this
relay needs to be field wired to the field provided signaling device to control this relay. A 115 VAC relay can be separately purchased as a field installed accessory and used to replace the 24
VAC relay if necessary.
By default, the designated UVC input for these features is configured for the ventilation lockout input feature (input energized =
outside air damper closed). Using a PC with the Monitor software and a proper cable kit the designated input can be re-conIM 613 / Page 9 (Rev. 5/00)
figured for an exhaust fan interlock signal (input energized = outside air damper fully open). Ventilation lockout (default) and exhaust fan interlock features cannot be used simultaneously as
they both use the same UVC input.
VDC coil of this relay and the diode will be field mounted and
connected to the appropriate UVC auxiliary output (see “Input/
Output Tables” and “UVC Inputs and Outputs” sections). The
normally open contacts of this relay can then be field wired to
signal or control the appropriate device.
Exhaust Fan Control Signal (Default) /Auxiliary
Heat Control Signal Output
By default, the designated UVC output is configured to be used
to signal exhaust fan operation (energized relay coil = exhaust
fan on). Using a PC with the Monitor software and a proper cable
kit the designated input can be re-configured for an auxiliary heat
signal used to control a normally open hot water valve. When
configured for auxiliary heat, the UVC will de-energize (valve
open) the relay coil whenever the UVC control temperature is
less than the current heating setpoint minus the Auxiliary Heat
Differential Setpoint (default 2°F) and then energize (valve closed)
the relay coil when the control temperature is 1°F or more above
the current heating setpoint. The Auxiliary Heat Differential
Setpoint is adjustable through the use of a PC with the Monitor
software and a proper cable kit.
The exhaust fan control signal output feature is provided so that
the UVC can be used to control a remote-mounted field-suppled
exhaust fan. The auxiliary heat output feature is provided so that
the UVC can be used to control a remote-mounted, field-supplied auxiliary heating device (typically a normally open water
valve). Exhaust fan control signal (default) and auxiliary heat
control signal features cannot be used simultaneously as they
both use the same UVC output.
One pilot duty 24 VDC relay and one diode need to be field provided when using the output for either of these features. The 24
Software ID
Unit Ventilator Controller software is factory installed and tested
in each unit prior to shipment. The software is identified by a
program code and “software model” number printed on a small
label attached to the controller (Refer to Figure 3).
Table 4 shows the 7 programs and 18 software models used for
the various unit ventilator models and configurations. As shown
in the table, a program comprises one or more software models.
Program number codification is as follows:
UV 1 S 2 B
Figure 3. Software ID Tag
Program Number
Unit Ventilator
Program Number
Unit Type
S = Stand-alone, Open Protocol
M = Master/Slave
N = MicroTech Network
Software Version (Numeric)
Software Version Revision (Alphabetical)
Software Model
Table 4. Programs and Software Models
Program
UV1***
UV2***
Model
AE
MDL00
•
AZ
UV5***
UV6***
UV7***
AV
Configuration
AH
Description
ASHP with Electric Heat
MDL02
•
WSHP with Electric Heat
•
WSHP Only
•
MDL05
MDL06
UV4***
AR
MDL03
MDL04
UV3***
Unit Ventilator Model
Software
•
•
DX Cooling with Electric Heat
•
•
DX Cooling Only
Electric Heat Only
•
•
MDL07
•
•
•
DX with Wet Heat, Valve Control
MDL08
•
•
•
DX with Wet Heat, Damper Control
MDL09
•
•
Wet Heat Only, Valve Control
MDL10
•
•
Wet Heat Only, Damper Control
MDL11
•
•
2-Pipe, Valve Control
MDL12
•
•
2-Pipe, Damper Control
MDL13
•
•
4-Pipe, Valve Control
MDL14
•
•
4-Pipe, Damper Control
MDL15
•
•
CW Cooling Only, Valve Control
MDL16
•
•
CW Cooling Only, Damper Control
MDL17
•
•
CW with Electric Heat, Valve Control
MDL18
•
•
CW with Electric Heat, Damper Control
Abbreviations:
ASHP
Air source heat pump
WSHP
Water source heat pump
IM 613 / Page 10 (Rev. 5/00)
DX
Direct expansion (refrigerant)
CW
Chilled water
Wet Heat Steam or hot water heat
2-Pipe
4-Pipe
Common hot water and chilled water coil
Separate wet heat and chilled water coils
Commissioning
Certified Drawing
WARNING
ELECTRICAL SHOCK HAZARD! Could cause severe injury or death. Failure to bond the frame of this equipment to the
building electrical ground by use of the grounding terminal provided or other acceptable means may result in electrical shock.
Service must be performed only by qualified personnel.
The following commissioning procedures pertain to unit ventilators equipped with the MicroTech Unit Ventilator Controller (UVC).
These procedures must be performed in addition to the mechanical
and electrical system commissioning procedures that are
outlined in the model-specific installation literature. Table 5
provides a listing of this literature.
A large part of the commissioning procedure is ensuring that the
unit ventilator operates according to its programmed sequence
of operation. The unit ventilator sequences of operation are
described in the program-specific literature listed in Table 6.
Table 6. Program-Specific Sequence of Operation Literature
Caution: Before power is applied to any unit, the pre-start
procedures in the model-specific installation literature must be
closely followed.
UVC Program
Operation Manual Bulletin Number
UV1***
OM 101
UV2***
OM 102
Table 5. Model-Specific Unit Ventilator Installation Literature
UV3***
OM 103
UV4***
OM 104
UV5***
OM 105
UV6***
OM 106
UV7***
OM 107
Unit Ventilator
Model
Installation & Maintenance
Data Bulletin Number
AED, AEQ
IM 502
AZS, AZQ
IM 503
ARQ, ERQ
UV-3-202
AVS, AVV, AVR
IM 506
Pre-Start
Required Tools and Literature
The following tools and additional literature may be required to
properly commission a MicroTech UVC.
Know Your Unit Ventilator
Before commissioning can proceed, the start-up technician must
know which options are supposed to be present on a particular
unit ventilator.
Tools:
1.
Digital voltmeter
1.
Check the model number code string against the job
requirements. Refer to the unit-specific installation bulletin
for a guide to model number nomenclature.
2.
Check the program and software model numbers against
the unit model number code string. The UVC software must
be compatible with the unit ventilator configuration. Refer
to the “Software ID” section of this manual.
2.
Digital ohmmeter
3.
Digital thermometer
4.
General technician’s tools
5.
PC equipped with Monitor software (required for master/
slave and Network UVC, optional for stand-alone UVC’s)
Note: If a PC is being used for commissioning, check the
software ID using the Monitor program. The controller’s
program is identified on one of the display screens.
Literature:
1.
Model-specific unit ventilator installation bulletin
(see Table 5)
2.
Program-specific sequence of operation bulletin
(see Table 6)
Unit Ventilator Identification
The AAF-McQuay unit ventilators look similar; however, there are
significant internal differences which are defined by the model
number code string. In addition to the basic heating and cooling
equipment, the model number code string specifies which
factory-configured options have been provided. These options
determine the internal wiring configuration and the field
wiring requirements.
Obviously, it is extremely important that the correct unit
ventilator be placed in the correct location in accordance with job
requirements. Proper unit ventilator location should have been
determined during the installation process. Nevertheless, proper
location must be verified during the commissioning process.
Field Wiring Check
The unit ventilator factory-configured options determine the low
voltage field wiring requirements. If a specific option is present
on a particular unit ventilator (as denoted by the model number),
the associated field wiring (if any) must be checked.
Detailed electrical installation instructions and field wiring
diagrams are included in the model-specific installation literature
supplied with each unit ventilator. Referring to this literature and
using the following check lists, the start-up technician should
thoroughly check the electrical installation before the
commissioning process proceeds.
Wall Sensor Packages
1.
Check that the cable is twisted and shielded.
2.
Check that the required number of conductors are available.
3.
Check that the shield is grounded in accordance with the
installation literature.
IM 613 / Page 11 (Rev. 5/00)
4.
Check that the conductors have been terminated at the unit
and the wall sensor package in accordance with the field
wiring diagram.
Remote Condensing or Heat Pump Unit (AV/AH Units Only)
Check that the conductors have been terminated at the unit in
accordance with the field wiring diagram.
5.
Check that the cable length between the wall sensor package
and its UVC does not exceed 250 feet.
6.
460V, Type AE & AZ Only: Check that 600-volt rated cable
has been used.
CAUTION
On AH units, it is recommended that the outdoor air
temperature sensor be located so that it will accurately sense
the outdoor air temperature. If this is not done, improper unit
operation or damage to the remote condensing or heat pump
unit could occur. The best location for the sensor is either
outside the building (shielded from solar radiation) or in the
outdoor air ductwork very near the intake.
Network Communication (Master/Slave or MicroTech
Network Units)
1.
Check that the cable is a twisted, shielded pair of
conductors.
2.
Check that the shield is grounded in accordance with the
installation literature.
3.
Check that the conductors have been terminated at the units
in accordance with the field wiring diagram.
4.
At the UVC board, verify that the IDC connectors are
disconnected from the Comm A and Comm B ports.
(They will be connected during the start-up process.)
5.
460V, Type AE & AZ Only: Check that 600-volt rated cable
has been used.
6.
MicroTech Network Units Only: Check that the conductors have been terminated at the Local Master Controller
(LMC) in accordance with the field wiring diagram supplied
with the LMC. Check that the cable length between the LMC
and the farthest UVC does not exceed 5000 feet.
Day-Night Changeover (Stand-alone or Master Units)
1.
Check that the conductors have been terminated at the unit
in accordance with the field wiring diagram.
Note: Field terminations are not required for the factory-mounted
time clock and manual switch options.
2.
3.
Check that the ultimate changeover device provides the
proper action at the UVC. The dry contacts connected to
DI-2 must be “open for occupied” and “closed for
unoccupied.” If used, the factory-installed relay is wired so
that it must be “de-energized for occupied” and “energized
for unoccupied.”
460V, Type AE & AZ Only: Check that 600-volt rated
conductors have been used.
Ventilation Lockout (Stand-alone, Master or Slave Units)
1.
Check that the conductors have been terminated at the unit
in accordance with the field wiring diagram.
2.
Check that the field-supplied device energizes the factoryinstalled relay when ventilation lockout is desired.
3.
460V, Type AE & AZ Only: Check that 600-volt rated
conductors have been used.
Exhaust Fan Interlock
1.
Check that the conductors have been terminated at the unit
in accordance with the field wiring diagram.
2.
Check that the field-supplied device energizes the factoryinstalled relay when exhaust fan interlock is desired.
3.
460V, Type AE & AZ Only: Check that 600-volt rated
conductors have been used.
IM 613 / Page 12 (Rev. 5/00)
Setpoint Initialization
Stand-alone and Master/Slave Units
The heating setpoint, unoccupied offset, and minimum OA damper
position potentiometers (pots) should be set to the desired
settings prior to start-up. For more information, refer to “Setpoint
Adjustment Potentiometers” in the “Component Data” section of
this manual.
Note: In a master/slave application, the master ’s pot
settings define the setpoint values for its slave controllers.
If communications fail, the affected slaves read their
setpoint values from their own setpoint pots. For this
reason, it is recommended that the three on-board setpoint
pots on each slave be set so that they match the master’s
settings.
Network Units
The three setpoint adjustment potentiometers on a network unit
are not operational. The UVC setpoint values are held in memory
and can only be modified over the MicroTech network. Initially,
before any changes are made over the network, the UVC will use
the default, factory-set setpoints shown in Table 7.
Table 7. Network UVC Default Setpoints
Setpoint
Occupied Cooling
Value
78°F
Occupied Heating
72°F
Unoccupied Cooling
88°F
Unoccupied Heating
62°F
Minimum OA Damper Position
20%
Start-Up
Certified Drawing
When the unit is in the occupied operating mode, verify
that the OA damper closes when the ventilation lockout
relay is energized.
Following are UVC start-up procedures for each communication
type. The start-up procedure must be performed by a qualified
technician for every UVC on a job.
Table 8. Network Communication Port Terminal Voltage Ranges
Communication
Port Terminal
Acceptable
Voltage Reading
4 (+)
3.0 ± 0.3 VDC
5 (-)
2.0 ± 0.3 VDC
6 (ground)
0.0 ± 0.2 VDC
Stand-alone
Because stand-alone controllers are independent of each other,
they may be started in any order.
PC Access
A PC is not required for stand-alone UVC start-up; however, the
start-up process will be easier and faster if a PC is used. If a PC
is used, it must be equipped with Monitor software. For further
information, refer to “PC Connection” in the “Service Information”
section of this manual.
Procedure for Each Stand-alone UVC
1.
Verify that the main power switch is at “Off.”
2.
Verify that the hex switch setting is not “00” or “FF.”
These settings are reserved for special applications. For
further information, refer to “Hex Switches” in the
“Component Data” section of this manual.
3.
Compressorized Units Only (Self-contained or Split
System): Set hex switches for random start delay.
Valid settings are between 01 and 3F. For further
information, refer to “Random Start” in the “Standard
Control Features” section of this manual.
4.
Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to the desired speed, wait 5-minutes until calibration
is complete.
5.
6.
Check the status LED and operating mode changeover
devices. The status LED should illuminate after calibration.
If a wall sensor package is used, the remote status LED
should also illuminate. Referring to Table 1, verify that the
day-night changeover and tenant override options (if
present) are working properly. Do this by switching these
devices and observing the status LED.
Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the room setpoint and unoccupied offset
pots to obtain the expected heating or cooling control
actions. If a PC is available, adjust any other applicable
parameters to obtain the expected UVC control actions.
7.
Check the remote setpoint adjustment pot operation
(if present).
Verify that the expected UVC control action occurs when
the remote pot is adjusted up or down.
8.
9.
Check that the exhaust fan interlock option works properly
(if present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
Master/Slave
Because it provides operating mode and setpoint information to
the slaves on its network, the master UVC must be started
before any slave. After the master has been started, the slaves
may be started in any order. However, if the start-up order follows
the daisy chain from the master UVC to successive slaves, it will
be easier to detect any wiring problems that may exist in the
communications trunk.
To perform the setup procedures on the next page you must have
the Windows Monitor program installed on a PC, the PC must be
connected with proper cabling to Port-A on the MicroTech controller, and you must have established communication between
the PC and the controller. The cable kit required to properly
connect a 9-pin serial PC port to Port-A on a MicroTech controller
is P/N 057186802 which will contain cables P/N 067784501 and
P/N 067784503.
The DOS Monitor program may also be used to perform these
setup procedures.
Points to keep in mind about Master/Slave Units
•
Master/Slave controllers must be either all MicroTech 125
or all MicroTech 325; you cannot mix 125’s with 325’s and
vice versa.
•
Master/Slave networks that have both new and old EOS
version MicroTech 325 controllers must use a new EOS
controller for the Master (new EOS 325 controllers are
labeled 21.169 or 21.A9, all other 325’s are old EOS).
•
Master/Slave controllers both use the same program
(UV*M**.COD).
•
All units are shipped as stand-alone units. Master/Slave
code must be downloaded and then Master/Slave configuration performed.
•
Slave UVC’s are considered to be independent slaves, this
means that Slave UVC’s obtain their setpoints from the Master UVC but the Slave UVC’s then operate based upon their
own sensors.
•
Port-A on a Master UVC unit will not communicate as you
may expect a stand-alone UVC to communicate. If you must
connect directly with a Master UVC, you must first set its
HEX network address switches to FF then cycle power. The
address to use in the Monitor program would then be 00.FF.
While the HEX network address switches are set at FF, the
Master UVC will not communicate with the Slave UVC’s
properly; therefore, you must remember to return the HEX
switches to their proper settings, then cycle power when
you are done.
Check that the ventilation lockout option works properly
(if present).
IM 613 / Page 13 (Rev. 5/00)
•
•
•
Slave units will communicate as expected when your PC is
connected to Port-A, simply make sure you use the correct
address for each Slave when using the Monitor program.
For example, if the Slave HEX switches are set at 01, then
the address you will use in the Monitor program will be 01.01;
if the HEX switches are set to 02 on the Slave UVC, then
you use 01.02 as the address, etc.
If you need to communicate with a UVC that is already configured as a Master and is part of an operating Master/Slave
network, then use the following method. For example, to
calibrate actuators on a Master UVC, connect to Port-A on
a Slave unit and set the Controller Address box on the
Monitor Read/Write screen to 01.00. This will gain access
to the Master controller so that actuator calibration may be
performed.
When a slave UVC loses communication to the Master UVC,
the Slave UVC will operate based upon its potentiometer
settings (i.e. % Minimum OA Position, etc.) located on the
faceplate of the Slave UVC.
to connect to one of the Slave UVC’s Port-A and set the
network address within the Monitor program to 01.00.
Initial Slave Configuration
1.
Connect all Slave UVC Port-B’s to the Master UVC’s PortB as shown on the drawings provided with the unit
ventilator (these drawings are typically mounted on the
inside of one of the unit ventilators removable panels).
2.
Connect the Slave UVC’s Port-A to the PC using the proper
cables.
3.
Using the Windows Monitor software, establish communications with the controller using network addresses 00.FF.
4.
In the Windows Monitor program, secure the correct
Master/Slave sotware, then go to the Support menu and
choose Read/Write.
5.
On the Read/Write screen, in the Operation box select the
Monitor radio button by clicking on it. In the Display box,
select the Decimal radio button by clicking on it.
6.
Enter the following string of memory addresses into the
Memory Address box exactly as shown, then press the
Enter Key: 8011-8012,8001-8002,0911,0204.
Initial Master Configuration
1.
Connect the Master UVC’s Port-A to your PC using the
proper cables.
7.
2.
Adjust the Master UVC’s Hex switches to FF and cycle unit
power (auto calibration will occur).
Write a value of 33 to location 8011 by clicking on the
current value.
8.
3.
Using the Windows Monitor software establish communications with the controller using address 00.FF.
Write a value of 0 to location 8012 by clicking on the
current value.
9.
4.
In the Windows Monitor program, secure the correct Master/
Slave software, then go to the Support menu and choose
Read/Write.
Write a value of 1 to location 0911 by clicking on the
current value.
10.
Write a value of 4 to location 0204 to reset the controller.
11.
Change location 8001 to equal 8002 if there is a difference.
If no difference, go to the next step.
12.
Change the Slave UVC Hex switches to 01 for Slave-1, 02for Slave-2, 03 for Slave-3, etc.
13.
Write a value of 4 to location 0204 to again reset the
controller.
14.
Slave configuration is complete, repeat this process for each
Slave.
5.
On the Read/Write screen, in the Operation box select the
Monitor radio button by clicking on it. In the Display box
select the Decimal radio button by clicking on it.
6.
Enter the following string of memory addresses into the
Memory Address box exactly as shown then press the
Enter key: 8011-8012,8001-8002,0911,0204.
7.
Write a value of 73 to location 8011 by clicking on the
current value.
8.
Write a value equal to the number of slaves you will have
into location 8012 by clicking on the current value of 8012.
This value must be 1 through 5 as the minimum number of
slaves is 1 and the maximum is 5. (Additional slaves may
be added but it is recommended you not exceed ten (10)
slaves).
9.
Write a value of 0 to location 0911 by clicking on the current value.
10.
Write a value of 4 to location 0204 to reset the controller.
11.
Change location 8001 to equal location 8002 if there is a
difference. If no difference, go to the next step.
12.
Change the Master UVC Hex switches to 01.
13.
Write a value of 4 to location 0204 to again reset the
controller.
14.
Master configuration is complete.
15.
At this point you will lose communications with the Master
UVC through Port-A on the Master. If you need to communicate with the Master UVC, the recommended method is
IM 613 / Page 14 (Rev. 5/00)
To Check an Existing Master UVC
1.
Verify that the main power switch is at “Off.”
2.
Set the network address.
For a master UVC, it is recommended that this hex switch
setting be “01”. (This is a “level 2” network address.) For
further information, refer to “Hex Switches” in the
“Component Data” section of this manual.
3.
Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to desired speed.
4.
Check the status LED and operating mode changeover
devices.
The status LED should illuminate after calibration. If a wall
sensor package is used, the remote status LED should also
illuminate.
Referring to Table 1, verify that the day-night changeover
and tenant override options (if present) are working
properly. Do this by switching these devices and observing
the status LED.
5.
5.
Use a DC voltmeter
to test the voltage levels at the Comm
Certified
Drawing
Check for proper voltage levels at the Comm B port.
B terminals with respect to ground. The terminals and acceptable voltage ranges are specified in Table 8.
Use a DC voltmeter to test the voltage levels at the Comm
B terminals with respect to ground. The terminals and
acceptable voltage ranges are specified in Table 8.
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
If the voltage levels are acceptable, go on to step 6.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
6.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
6.
8.
Check for remote setpoint adjustment pot operation (if
present). Verify that the expected UVC control action
occurs when the remote pot is adjusted up or down.
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
If no voltage or improper voltage levels are found, verify that
the master UVC is energized and that the communications
trunk wiring is intact.
7.
Check that the ventilation lockout option works properly
(if present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
Check that the fan interlock option works properly (if
present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
To Check Existing Slave UVC
1.
Verify that the main power switch is at “Off.”
2.
Set the network address.
Each slave must have a unique hex address. Begin by
setting the first slave’s address to “01.” (This is a “level 3”
network address.) Address each subsequent Slave in
consecutive order (02, 03, 04, 05). For further information,
refer to “Hex Switches” in the “Component Data” section of
this manual.
3.
Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to desired speed, wait 5 minutes until calibration is
complete.
4.
Check the status LED.
The status LED should illuminate after calibration. If a wall
sensor package is used, the remote status LED should also
illuminate.
Verify that the slave’s status LED indication matches the
master’s indication, regardless of the operating mode.
If the status LED is flashing in a 16-blink sequence, the
slave is not communicating with its master. Refer to “Test
Procedures” in the “Service Information” section of this
manual.
Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the UVC heating and cooling setpoints to
obtain the expected heating or cooling control actions. This
can be accomplished either by adjusting the pots at the
master or by disconnecting the communications cable and
adjusting the pots at the slave. (If the latter option is chosen,
be aware that the status LED will indicate a 16-blink
communication failure alarm.)
When the unit is in the occupied operating mode, verify
that the OA damper closes when the ventilation lockout
relay is energized.
9.
Check for proper voltage levels at the communication port
IDC connector.
Use a DC voltmeter to test the voltage levels at the
connector terminals with respect to ground. Test at the
connector terminals corresponding to the communication
port terminals listed in Table 8. Verify that the voltages are
within the ranges specified in the table.
Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
Since the sensed temperatures are fixed at any given
moment, adjust the room setpoint and unoccupied offset
pots to obtain the expected heating or cooling control
actions. If a PC is available, adjust any other applicable
parameters to obtain the expected UVC control actions.
7.
Check for proper voltage levels at the Comm B port.
If a PC is available, adjust any other applicable parameters
(at the slave) to obtain the expected UVC control actions.
8.
Check that the ventilation lockout option works properly
(if present).
When the unit is in the occupied operating mode, verify that
the CA damper closes when the ventilation lockout relay is
energized.
9.
Check that the exhaust fan interlock option works properly
(if present).
Verify that the CA damper opens when the exhaust fan
interlock relay is energized.
Network
Prior to the start-up of any Network Unit Ventilator Controllers,
the following MicroTech network devices must be commissioned:
•
IBM compatible PC with Monitor software
•
Network Master Panel
•
Local Master Panel (as applicable)
•
Loop Water Controller (as applicable)
Refer to the literature supplied with these products for information
on installing and commissioning them.
After these devices have been properly commissioned, the
network UVC’s may be started in any order. However, if the startup order follows the daisy chain from one UVC to the next, it will
IM 613 / Page 15 (Rev. 5/00)
be easier to detect any wiring problems that may exist in the
communications trunk.
Communications Cable Check
unoccupied and check that the status LED responds
accordingly.
8.
Perform this check for every communications trunk connected to
a Network Master Panel (NMP) or Local Master Panel (LMP).
1.
Be sure that the communication port IDC connectors are
disconnected at every UVC on the trunk.
2.
Check that there are no shorts between any two conductors
in the communications trunk.
Use an ohmmeter to test for shorts at the communication
port IDC connector of the NMP or LMP. (For the three
combinations of conductor pairs, there should be infinite
resistance between the conductors.) If the conductors are
properly terminated, this check will test for shorts throughout the trunk.
Since the sensed temperatures are fixed at any given
moment, adjust the UVC heating and cooling setpoints (at
the network PC) to obtain the expected heating or cooling
control actions.
Adjust any other applicable parameters to obtain the
expected UVC control actions.
9.
Check that any desired network-executed control features
are working properly (ventilation lockout, demand limiting,
etc.).
10.
Review the submittal drawings and make any necessary
changes to the default UVC setpoints and parameters.
11.
Check the remote setpoint adjustment pot operation
(if present).
Procedure for Each Network UVC
1.
Verify that the main power switch is at “Off.”
2.
Set the network address.
Each UVC on an NMP or LMP trunk must have a unique
hex address. This address should be specified in the job
submittal drawings. Refer to the submittal drawings and set
the address in accordance with them. (This is a “level 3”
network address.) For further information, refer to “Hex
Switches” in the “Component Data” section of this manual.
3.
Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to either desired speed, wait 5 minutes until calibration is complete.
4.
Check the status LED.
The status LED should illuminate after calibration. If a wall
sensor package is used, the remote status LED should also
illuminate.
5.
Verify that the expected UVC control action occurs when
the remote pot is adjusted up or down.
12.
PC Access
A PC equipped with Monitor software is required for master or
slave UVC start-up. For further information, refer to “PC
Connection” in the “Service Information” section of this manual.
Communications Cable Check
1.
Be sure that the communication port IDC connectors are
disconnected at every UVC on the network.
2.
If the voltage levels are acceptable, go on to step 6.
Check for proper voltage levels at the communication port
IDC connector.
Use a DC voltmeter to test the voltage levels at the
connector terminals with respect to ground. Test at the
connector terminals corresponding to the communication
port terminals listed in Table 8. Verify that the voltages are
within the ranges specified in the table.
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
Use an ohmmeter to test for shorts at the communication port
IDC connector of the NMP or LMP. (For the three combinations
of conductor pairs, there should be infinite resistance between
the conductors.) If the conductors are properly terminated, this
check will test for shorts throughout the trunk.
Procedure for Each Network UVC
1.
Verify that the main power switch is at “Off.”
2.
Verify that network communications between the UVC and
the NMP have initiated.
At the network PC, change the operating mode to
IM 613 / Page 16 (Rev. 5/00)
Set the network address.
Each UVC on an NMP or LMP trunk must have a unique
hex address. This address should be specified in the job
submittal drawings. Refer to the submittal drawings and set
the address in accordance with them. (This is a “level 3”
network address.) For further information, refer to “Hex
Switches” in the “Component Data” section of this manual.
If no voltage or improper voltage levels are found, verify
that the NMP or LMP is energized and that the communications trunk wiring is intact.
7.
Check that there are no shorts between any two conductors in the communications trunk.
Use an ohmmeter to test for shorts at the communication
port IDC connector of the Master UVC. (For the three
combinations of conductor pairs, there should be infinite
resistance between the conductors.) If the conductors are
properly terminated, this check will test for shorts throughout the network.
Use a DC voltmeter to test the voltage levels at the Comm
B terminals with respect to ground. The terminals and
acceptable voltage ranges are specified in Table 8.
6.
Check that the exhaust fan interlock option works properly
(if present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
Check for proper voltage levels at the Comm B port.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
3.
Apply power to the unit.
Turn the main power switch to “On” and the motor speed
switch to either desired speed, wait 5 minutes until calibration is complete.
4.
At the network PC, change the operating mode to
unoccupied and check that the status LED responds
accordingly.
8.
Check for proper voltage levels at the Comm B port.
Use a DC voltmeter to test the voltage levels at the Comm
B terminals with respect to ground. The terminals and
acceptable voltage ranges are specified in Table 8.
6.
Verify that network communications between the UVC and
the NMP have initiated.
Certified Drawing
Check the status LED.
The status LED should illuminate after calibration. If a wall
sensor package is used, the remote status LED should also
illuminate.
5.
7.
Verify that the unit ventilator is operating in accordance with
its sequence of operation as outlined in the appropriate
documentation (refer to Table 6).
If the voltage levels are acceptable, go on to step 6.
Since the sensed temperatures are fixed at any given
moment, adjust the UVC heating and cooling setpoints
(at the network PC) to obtain the expected heating or cooling
control actions.
If no voltage or improper voltage levels are found, the UVC
is defective and must be replaced.
Adjust any other applicable parameters to obtain the
expected UVC control actions.
Check for proper voltage levels at the communication port
IDC connector.
Use a DC voltmeter to test the voltage levels at the connector
terminals with respect to ground. Test at the connector
terminals corresponding to the communication port terminals
listed in Table 8. Verify that the voltages are within the ranges
specified in the table.
9.
Check that any desired network-executed control features
are working properly (ventilation lockout, demand limiting,
etc.).
10.
Review the submittal drawings and make any necessary
changes to the default UVC setpoints and parameters.
11.
Check the remote setpoint adjustment pot operation
(if present).
If the voltage levels are acceptable, connect the IDC
connector to the Comm B port.
If no voltage or improper voltage levels are found, verify
that the NMP or LMP is energized and that the
communications trunk wiring is intact.
Verify that the expected UVC control action occurs when
the remote pot is adjusted up or down.
12.
Check that the exhaust fan interlock option works properly
(if present).
Verify that the OA damper opens when the exhaust fan
interlock relay is energized.
Diagnostics & Service
Alarm Monitoring & Control
The Unit Ventilator Controller (UVC) is programmed to monitor
the unit ventilator for specific alarm conditions that may occur on
the various model types. If an alarm condition exists and is
| detected by the UVC, a “fault” will occur. The UVC will indicate
the fault and execute appropriate control actions for the alarm
conditions. For most faults, these actions will fail-safe the unit
ventilator.
Fault Code Interpretation
UVC faults are indicated at the status LED (on-board or remote).
If a fault exists, operating mode indication will be replaced by an
alarm-specific fault indication, the fault code.
A fault code is a series of blinks followed by a one-second pause.
The number of blinks identifies the alarm condition as shown in
Table 9. The fault code sequence will repeat continuously until
the fault is cleared.
Priority and Multiple Alarms
Faults are ranked in order of their priority. Higher priority faults
have lower fault code blink counts (see Table 9). If more than one
fault is present at a time, the status LED will indicate the one with
the highest priority. As the higher priority faults are cleared, the
lower priority faults will be indicated.
The UVC will simultaneously respond to multiple faults with the
appropriate control actions. If the programmed control actions of
multiple faults are contradictory, the higher priority fault actions
will occur. For example, assume that the 5-blink “low water coil
temperature” and 7-blink “heating valve position feedback
failure” faults exist concurrently. When the feedback failure fault
occurs, UVC control of the heating valve outputs is programmed
to cease (the valve would then hold its position). When the low
coil temperature fault occurs, the heating valve is programmed to
modulate to 25% open. In this situation, the 5-blink low coil
temperature alarm has higher priority. Therefore, the heating valve
will be opened. (Since there is no reliable feedback, the valve
could possibly open past the 25% setpoint.)
Clearing Faults
Before any fault can be cleared, the alarm conditions that caused
it must have returned to normal. When the alarm conditions are
gone, a fault may be cleared either automatically or manually.
Refer to Table 9 (page 18).
An auto reset fault will immediately clear whenever the alarm
conditions that caused it disappear.
A manual reset fault can be cleared by cycling power to the controller.
Note: The cause of a manual reset fault should be investigated
and eliminated before the unit is placed back into service.
Alarm Descriptions
Following are descriptions of the various faults listed in Table 9.
Note that some alarms are present only on certain unit ventilator
model types and configurations.
2-Pipe Units Only: All references to heating or cooling valves
(modulating or EOC) in the “Effects” sections below also apply to
2-pipe units. Whether the 2-pipe valve is a “heating” or “cooling”
valve is determined by the entering water temperature. The
changeover setpoint is 80°F (default).
IM 613 / Page 17 (Rev. 5/00)
Table 9. Alarm and Fault Code Summary
Status LED
Blinks
(Priority
Alarm Description
(Fault)
`
Trigger
Factory Setting
2
Room Temperature Sensor Failure
Software
3
High Pressure
Hardware
(HP)
Outside Range:
0.39 to 4.88 VDC (±4%)
Opens at 400 ± 10 psig
Closes at 300 ± 20 psig
Hardware
(T4)
Opens at 30 ± 4°F
Closes at 50 ± 6°F
Hardware
(T2)
Standard Range:
Opens at 36 ± 3°F
Closes at 46 ± 2°F
Extended Range & Ground
Opens at 25 ± 3°F
Closes at 35 ± 2°F
Closes at 30 ± 4°F
Opens at 50 ± 6°F
3
4
5
Low DX Coil Temperature (Units with Wet Heat)
Low Refrigerant Temperature (Water Coil)
Low DX Coil Temperature (Units without Wet Heat)
Hardware
(T4)
5
Low Water Coil Leaving Air Temperature
6
Brownout
Hardware
(T6)
Software
7
Heating Valve Position Feedback Failure
Software
8
Valve or F&BP Damper Position Feedback Failure
Software
9
`
10
OA Damper Position Feedback Failure
Software
Discharge Air Temperature Sensor Failure
Software
11
Outdoor Air Temperature Sensor Failure
Software
12
Mixed Air Temperature Sensor Failure
Software
13
Water-In Temperature Sensor Failure
Software
15
16
Change Filter (Network Units Only)
Communication Error (Master/Slave Only)
Software
Software
●
Alarm is available for this unit.
●
Alarm may be available, depending on unit configuration.
Room Temperature Sensor Failure
The “Room Temperature Sensor Failure” fault will occur when
the voltage across the sensor is outside the acceptable range.
Refer to “Test Procedures” in the “Service Information” section of
this manual for information on troubleshooting sensor faults.
Effects (as applicable):
•
Fan is immediately de-energized.
•
Compressor is immediately de-energized.
•
Reversing valve is de-energized after a delay.
•
Outside air damper is closed.
•
All electric heat stages are de-energized.
•
Face and bypass damper is positioned to 100% face.
•
Heating valve is fully opened to the coil.
•
Chilled water valve is closed to the coil.
•
Heating EOC valve is opened.
•
Cooling EOC valve is closed.
High Pressure
The “High Pressure” fault is an indication that the high pressure
switch input (DI-4) sensed an open circuit while the controller
was calling for the compressor to run.
IM 613 / Page 18 (Rev. 5/00)
Closes at 38 ± 2°F
Opens at 45 ± 2°F
Line Voltage < 85%
of Nameplate Voltage
Outside Range:
0.2 ± 0.1 to 3.68 ± 0.29 VDC
Outside Range:
0.2 ± 0.1 to 3.68 ± 0.29 VDC
Outside Range:
0.2 ± 0.1 to 3.68 ± 0.29 VDC
Outside Range:
0.39 to 4.88 VDC (±4%)
Outside Range:
0.39 to 4.88 VDC (±4%)
Outside Range:
0.39 to 4.88 VDC (±4%)
Outside Range:
0.39 to 4.88 VDC (±4%)
Fan Runtime Setpoint, Adj.
N/A
Fault Reset
(Clear)
Auto
2-Auto resets
within 7-days
then Manual
2-Auto resets
within 7-days
then Manual
2-Auto resets
within 7-days
then Manual
2-Auto resets
within 7-days
then Manual
Auto
Auto
(after 5 min)
Auto
Unit Ventilator Model
AED AZS ARQ AVS AHF
AEQ AZQ ERQ AVV AHV
●
●
●
●
●
●
●
Auto
Auto
Auto
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Auto
Network
Auto
●
●
Auto
Auto
●
●
●
The high pressure switch (HP) is wired in series with the
compressor relay output (RO-2), the compressor relay coil (R1),
and the UVC alarm input. Therefore, if a high pressure condition
occurs, the compressor will be immediately shut down by the
switch; then it will be disabled by the UVC. Refer to “Test
Procedures” in the “Service Information” section of this manual
for information on troubleshooting digital input faults.
AV/AH Units Only: Because compressorized AV or AH models
are split systems, a factory-mounted high pressure switch is not
possible, and the high pressure fault is not available. On some of
these models, DI-4 is directly connected to 24 VAC to simulate a
no-fault condition.
AZ Units with Wet Heat: Note that a 3-blink fault code could be
either a high pressure or low DX coil temperature alarm.
Effects (as applicable):
•
Compressor is immediately de-energized.
Low DX Coil Temperature (3-Blink Fault Code)
The 3-blink “Low DX Coil Temperature” fault is an indication that
the low temperature switch input (DI-4) sensed an open circuit
while the controller was calling for the compressor to run.
The low DX coil temperature switch (T4) is wired in series with
the compressor relay output (RO-2) and the UVC alarm input.
Switch T4 will open when the coil temperature falls below its
setpoint. Refer to “Test Procedures” in the “Service Information”
section of this manual for information on troubleshooting digital
input faults.
AZ Units with Wet Heat: Note that a 3-blink fault code could be
either a low DX coil temperature or high pressure alarm.
Effect:
•
Compressor is immediately de-energized.
Low Refrigerant Temperature (Water Coil)
The “Low Refrigerant Temperature” fault will occur when the
water source heat pump is in the heating mode and the
refrigerant temperature is at or below the low limit setpoint.
Usually, a low refrigerant temperature condition is caused by insufficient water flow.
Effects:
•
Compressor is immediately de-energized.
•
Reversing valve is immediately de-energized.
Low DX Coil Temperature (5-Blink Fault Code)
The 5-blink “Low DX Coil Temperature” fault is an indication that
the low temperature switch input (DI-5) sensed a contact closure
while
the
controller was calling for compressorized cooling. (UVC’s on air
source heat pumps in the defrost cycle will ignore this alarm condition.)
The low DX coil temperature switch (T4) is connected
between 24 VAC and the UVC alarm input. Switch T4 will close
when the coil temperature falls below its setpoint. Refer to “Test
Procedures” in the “Service Information” section of this manual
for information on troubleshooting digital input faults.
Effect:
•
Compressor is immediately de-energized.
Low Water Coil Leaving Air Temperature
The “Low Water Coil Temperature” fault is an indication that the
low temperature switch input (DI-5) is sensing a contact closure.
The low water coil temperature fault can occur at any time,
regardless of the Control Temperature or operating mode.
The low water coil temperature switch (T6) is connected
between 24 VAC and the UVC alarm input. Switch T6 will close
when the coil temperature falls below its setpoint. Refer to “Test
Procedures” in the “Service Information” section of this manual
for information on troubleshooting digital input faults.
Note: On 2-pipe valve controlled units, the entering water
temperature determines whether the valve will be enabled for
heating. It must be greater than 80°F (default), otherwise the
valve will be closed.
Effects (as applicable):
•
Outdoor air damper is closed (exhaust fan interlock
feature is overridden).
•
Heating valve is positioned to 100% open to the coil
(discharge air temperature < 55°F, default).
•
Heating valve is positioned 25% open to the coil
(discharge air temperature ≥ 55°F, default).
•
Chilled water valve is closed to the coil.
•
•
Compressor is immediately de-energized.
First stage of
electric heat is energized (only if fan is on).
Certified
Drawing
Brownout
The “Brownout” fault indicates that the UVC is sensing low
voltage levels. It is a safety that is intended to protect the
compressor and electric heat contactors from low line voltage or
“brownout” conditions.
The controller is programmed with a brownout setpoint that
corresponds to 85% of the unit ventilator’s nameplate line
voltage value. If the UVC senses a voltage level less than its
setpoint for more than 10 seconds (2 seconds with electric heat),
it will trigger the brownout fault. The fault will reset when the
sensed voltage remains at or above a level corresponding to 90%
of the nameplate value for a period of 5 minutes. For information
on troubleshooting this alarm, refer to “Test Procedures” in the
“Service Information” section of this manual.
Effects (as applicable):
•
Compressor is immediately de-energized.
•
All electric heat stages are immediately de-energized.
Heating Valve Position Feedback Failure (4-Pipe Units Only)
The “Heating Valve Position Feedback Failure” fault is an
indication that the UVC is sensing a valve position feedback
voltage that is outside the acceptable range. Refer to “Test
Procedures” in the “Service Information” section of this manual
for information on troubleshooting actuator feedback faults.
Effect:
•
Heating valve will hold its position.
Valve or Face and Bypass Damper Position Feedback Failure
The “Valve or F&BP Damper Position Feedback Failure” fault is
an indication that the UVC is sensing a valve or F&BP damper
position feedback voltage that is outside the acceptable range.
Refer to “Test Procedures” in the “Service Information” section of
this manual for information on troubleshooting actuator feedback
faults.
On 4-pipe valve controlled units, this fault applies to the chilled
water valve. On all other units with control valves or F&BP
dampers, there is only one possibility: heating valve, chilled
water valve, or F&BP damper actuator.
Effect:
•
Valve or actuator will hold its position.
Outdoor Air Damper Position Feedback Failure
The “Outdoor Air Damper Position Feedback Failure” fault is an
indication that the UVC is sensing a damper position feedback
voltage that is outside the acceptable range. Refer to “Test
Procedures” in the “Service Information” section of this manual
for information on troubleshooting actuator feedback faults.
Effect:
•
Outdoor air damper will hold its position.
Discharge Air Temperature Sensor Failure
The “Discharge Air Temperature Sensor Failure” fault will occur
when the voltage across the discharge air sensor is outside the
acceptable range. Refer to “Test Procedures” in the “Service
Information” section of this manual for information on troubleshooting sensor faults.
Effects (as applicable):
•
Control Temperature is set equal to the room temperature.
•
Discharge air low limit functions are disabled.
•
Discharge air high limit function is disabled.
IM 613 / Page 19 (Rev. 5/00)
•
All other control processes execute normally (discharge air
temperature is assumed to be acceptable).
Effects (as applicable to 2-pipe units):
•
Valve or face and bypass damper cooling operation is
disabled (entering water temperature is assumed to be
high).
•
EOC valve will act as a heating EOC valve (entering water
temperature is assumed to be high).
Outdoor Air Temperature Sensor Failure
The “Outdoor Air Temperature Sensor Failure” fault will occur
when the voltage across the outdoor air sensor is outside the
acceptable range. Refer to “Test Procedures” in the “Service
Information” section of this manual for information on troubleshooting sensor faults.
Effects (as applicable):
•
Economizer cooling is disabled (ventilation cooling lockout
function assumes OA temperature is high).
•
Compressorized cooling is disabled on all except AR unit
(low ambient compressor lockout function assumes OA
temperature is low).
•
On ASHP units, electric heat can be enabled by the
emergency heat, defrost, or discharge air low limit
functions only (OA temperature is assumed to be high).
•
Heating EOC valve is controlled by room temperature only
(OA temperature is assumed to be high).
Water-In Temperature Sensor Failure
The “Water-In Temperature Sensor Failure” fault is applicable to
WSHP units and to units equipped with water coils (except for
4-pipe valve controlled units). It will occur when the voltage across
the entering water temperature sensor is outside the acceptable
range. Refer to “Test Procedures” in the “Service Information”
section of this manual for information on troubleshooting sensor
faults. Note: Except for 2-pipe units, this fault will not affect the
normal operation of units equipped with water coils.
Effects (as applicable to WSHP units):
•
Economizer changeover function depends on OA temperature only (entering water temperature is assumed to be
high).
•
Compressorized heating is available (entering water
temperature is assumed to be high).
•
Electric heat can be enabled by the emergency heat or
discharge air low limit functions only (entering water
temperature is assumed to be high).
Water-Out Temperature Sensor Failure
The “Water-Out Temperature Sensor Failure” fault will occur when
the voltage across the leaving water temperature sensor is
outside the acceptable range. Refer to “Test Procedures” in the
“Service Information” section of this manual for information on
troubleshooting sensor faults.
Change Filter
The “Change Filter” fault is a network feature indicating that the
fan has operated longer than the set number of hours. Typically,
this alarm is used to alert the building operator of the need to
replace the filter. To clear the fault, the filter timer must be reset
at the network PC.
Effect:
•
An alarm message Iis sent over the network.
Communication Error
The “Communication Error” fault can only occur on slave units. It
indicates that the unit is not communicating with its master. Refer to “Test Procedures” in the “Service Information” section of
this manual for information on troubleshooting this fault.
Effects:
•
Room temperature, unoccupied offset, and minimum
OA damper position setpoints will be obtained from
the slave UVC’s on-board pots.
•
The operating mode will be that last received over
the network from the master (cycling power will place
the unit in the occupied mode).
•
All other control processes execute normally.
Service Information
PC Connection
A personal computer (PC) equipped with the appropriate
Monitor software may be directly connected to any UVC.
Typically, for start-up or service purposes, the PC would be a
portable laptop or notebook type (see PC specification below).
For stand-alone, master, or slave controllers, the computer must
be loaded with “stand-alone” Monitor software. For network
controllers, the PC must be loaded with the job-specific “network”
Monitor software.
For all unit types, the PC is connected to the UVC at port Comm
A. For master UVC’s only, a special procedure is required to
reconfigure the port for PC connection (see below).
MicroTech controllers use the RS-232C format for PC
communications. The data transmission speed is 9600 baud.
PC Specification
A directly connected computer may be used for monitoring unit
operation, changing setpoints, trend logging, downloading software, and diagnostics. The PC must be an IBM or 100% true
compatible with the following features (minimum requirements):
•
386SX microprocessor
•
2 Megabytes of RAM (Random Access Memory)
IM 613 / Page 20 (Rev. 5/00)
•
60 Megabyte hard disk drive
•
3˚” floppy disk drive
•
Asynchronous Serial Communications Adapter
(9 or 25 pin male)
•
101 enhanced keyboard
•
VGA graphics capability
•
Internal time clock, battery backed
•
Windows 3.1 or Windows 95
•
MicroTech Monitor software
Cable Specification
A properly terminated, shielded, twisted pair cable is required to
connect a PC to the UVC (Belden 8761 or equivalent). The cable
must be terminated at an IDC connector as shown in Table 10.
The maximum allowable cable length for direct connection between the PC and UVC is 50 feet. If the desired length is over 50
feet, an RS-232 cable extension kit is required (contact AAFMcQuay).
A universal communications cable kit that allows a PC to be
connected to any MicroTech controller is available from
AAF-McQuay. The part number is 57186801.
Table 10. RS-232 Communications Cable Terminations
Comm. Port Terminal
1
Connection
Jumped to terminal 2
2
Jumped to terminal 1
3
Transmit
4
Not used
5
Receive
6
Ground
Master UVC Connection Procedure
Normally, port Comm A of a master UVC is not available for any
use. The port may be reconfigured for PC communications at
9600 baud using the RS-232 format by performing the following
procedure:
1.
Disconnect power to the UVC (use fan switch or mainpower
switch).
2.
Set the hex switches to “FF.”
3.
Connect the PC to the UVC at port Comm A.
4.
Apply power to the UVC.
Digital Inputs
The UVC has six digital inputs, all of which are available for
Certified Drawing
external (IDC) connection. These inputs are labeled “DIGITAL
IN” on the UVC and “DI-0” through “DI-5” on the unit wiring
diagram. Each input has two terminals: a numeric terminal and a
common “DI-R” (ground) terminal (see Figure 1). All UVC digital
input circuits are optically isolated.
The digital inputs sense the presence or absence of an
external 24 VAC power source (transformer X3). The power
source is connected to the input through a switch or set of contacts (see Figure 4). Refer to the wiring diagram supplied with
your unit for specific wiring details.
Figure 4. Digital Input Wiring Example
X3
24 VAC
UVC
DI-2
DI-R
DI-3
To return the master to normal operation, remove power, reset
the hex switches, disconnect the PC, and restore power.
Note: The above procedure will also reconfigure port Comm B.
As a result, network communications will be discontinued.
UVC Inputs and Outputs
IDC Terminal Connectors
All connections to the UVC board are made using 0.156"
insulation displacement type (IDC) terminals. The IDC
connectors can accept up to 18 AWG, 0.085" OD wire. They are
available in two- through six-conductor styles (see parts list).
The IDC connector displaces wire insulation to make
contact with the conductor. If a faulty UVC connection is
suspected, try pressing down on the wire in the IDC terminal with
a small screwdriver.
Analog Inputs
The UVC has 14 analog inputs. Ten of these are available for
external (IDC) connection; the remaining four are used for
internal connections to the three on-board pots and the
brownout voltage sensor.
The ten analog inputs that are available for external
connection are labeled “IN0” through “IN9” on the UVC and the
Unit wiring diagram. Each input has two terminals: an “S” (signal) terminal and a “G” (ground reference) terminal. Inputs IN0
and IN1 have a common “G” terminal (see Figure 1). The “G”
terminals of inputs IN2 through IN9 are internally connected.
Each “S” terminal is internally connected to a 5 VDC power supply
through a 3.3 KW resistor. The voltage at the “S” terminal varies
as the temperature sensor resistance or actuator feedback signal
changes. The UVC converts these voltages into temperature or
actuator position data. (Refer to Table 18 and Figure 6.)
DI-4
DI-5
Relay Outputs
The UVC has eight relay outputs. These outputs are internally
connected to the normally open contacts of eight on-board,
electromechanical relays. The outputs are labeled “RELAY
OUTPUT” on the UVC and “RO-1” through “RO-8” on the unit
wiring diagram. Each output has two terminals: a numeric
terminal and a common “RO-H” (hot) terminal (see Figure 1).
The unit ventilator’s 24 VAC loads are connected as shown in
Figure 5, (page 22). The loads could be a contactor, another
relay, a solenoid or an actuator’s “open” or “close” circuits. Refer
to the wiring diagram supplied with your unit for specific wiring
details.
Auxiliary Outputs
The UVC has two Triac based auxiliary outputs. Output AO-9 is
currently not used for field applications. Output AO-10 can be
used to operate a field provided 24vdc pilot duty relay, (see figure 4a). By default, the normally open contacts of this field provided 24vdc pilot duty relay can then be used to signal exhaust
fan operation (energized coil = exhaust fan on). Using a PC with
the Monitor software and proper cable kit the AO-10 output can
be re-configured in the field to operate the same 24vdc pilot duty
relay to provide an auxiliary heat signal (energized coil = auxiliary heat off) instead of exhaust fan signal. Exhaust fan signal
(default) and auxiliary heat signal features cannot be used simultaneously as they both use the same output.
IM 613 / Page 21 (Rev. 5/00)
Figure 4a. Auxiliary Output Wiring Example
UVC
AO-V
+29vdc @ 30mA
AO-10
Input/Output Tables
All UVC input and output connections and their corresponding
unit ventilator components are shown in the following tables. The
tables are arranged according to UVC program and software
model numbers. To determine the correct input/output
information for a particular unit ventilator, you must know these
numbers. Refer to the software ID tag attached to the UVC
faceplate, or refer to Table 4.
24vdc
Relay Coil (wiring by others)
Table 11.
Diode (wiring by others)
Connection
Figure 5. Relay Output Wiring Example
24 VAC
X3
UVC
R0-H
Solenoid
RO-2
RO-3
RO-5
Open
Modulating
Actuator
Close
RO-6
UVC
RO-7
RO-8
Component Description
IN0
MDL00
Tenant override or remote spt. adjust or
both (optional)
IN1
MDL00
Room temperature sensor
IN2
MDL00
Discharge air temperature sensor
IN3
MDL00
Outdoor air temperature sensor
IN5
MDL00
Not Used
IN6
MDL00
Not Used
IN7
MDL00
Outside air damper position
DI-1
MDL00
Ventilation lockout (default) or exhaust fan
interlock (optional)
DI-2
MDL00
Day-night changeover device (optional)
DI-3
MDL00
➀
Emergency heat switch (SW5) & defrost
control (T5)
DI-4
MDL00
➁
High pressure switch (HP)
DI-5
MDL00
RO-1
MDL00
Fan relay (R4)
RO-2
MDL00
Compressor relay
(R1 on AE, R7 on AV/AH)
RO-3
MDL00
Reversing valve
RO-4
MDL00
Outside air damper open
RO-5
MDL00
Outside air damper close
RO-6
MDL00
Electric heat stage 1
RO-7
MDL00
Electric heat stage 2
RO-8
MDL00
Electric heat stage 3
AO-10
MDL00
Exhaust fan relay or auxilliary heat relay
Low DX coil temperature switch (T4)
Notes:
1.
Emergency heat switch SW5 and defrost control T5 are
wired in parallel. SW5 has momentary contacts and T5 has
maintained contacts.
2.
IM 613 / Page 22 (Rev. 5/00)
Software
Model
Relay
RO-1
RO-4
Inputs and Outputs for Program UV1***
Units (Models AE or AV/AH)
High pressure switch HP is not installed on AV/AH units.
These units are wired to provide a constant, no-fault
condition.
Table 12.
Connection
Inputs and Outputs for Program UV2***
Units (Models AR)
Software
Model
Component Description
Table 13.
Certified
Connection
Inputs and Outputs for Program UV3***
Units
(Models AZ or AV/AH)
Drawing
Software
Model
Component Description
IN0
All
Tenant override or remote spt. adjust or both
(optional)
IN0
All
Tenant override or remote spt. adjust or
both (optional)
IN1
All
Room temperature sensor
IN1
All
Room temperature sensor
IN2
All
Discharge air temperature sensor
IN2
All
Discharge air temperature sensor
IN3
All
Outdoor air temperature sensor
IN3
All
Outdoor air temperature sensor
IN5
All
Water-in temperature sensor
IN5
All
Not Used
All
Water-out temperature sensor
& low refrigerant temperature switch
IN6
All
Not Used
IN7
All
Outside air damper position
All
Outside air damper position
DI-2
All
Day-night changeover device (optional)
All
Ventilation lockout (default) or exhaust fan
interlock (optional)
DI-3
All
Ventilation lockout (default) or exhaust fan
interlock (optional)
All
Day-night changeover device (optional)
IN6
IN7
DI-1
DI-2
DI-3
MDL02
MDL03
All
High pressure switch (HP)
DI-5
All
Low DX coil temperature switch (T4)
RO-1
All
Fan relay (R4)
RO-2
All
Compressor relay (R1)
RO-3
All
Reversing valve
RO-4
All
Outside air damper open
RO-5
All
Outside air damper close
RO-7
RO-8
AO-10
MDL02
Electric heat stage 1
MDL03
Not used
MDL02
Electric heat stage 2
MDL03
Not used
MDL02
Electric heat stage 3
MDL03
Not used
All
DI-4
Not Used
DI-4
RO-6
MDL04
Emergency heat switch (SW5)
DI-5
RO-1
MDL05
Not used
MDL06
Not used
MDL04
Low DX coil temperature switch (T4)
MDL05
Low DX coil temperature switch (T4)
MDL06
Not used
All
MDL04
RO-2
High pressure switch (HP)
➀
Fan relay (R4)
Compressor relay (R1 on AZ, R7 on AV/AH)
MDL05
Compressor relay (R7)
MDL06
Not used
RO-3
All
Not used
RO-4
All
Outside air damper open
RO-5
All
MDL04
RO-6
Exhaust fan relay (default) or auxilliary heat relay
RO-7
RO-8
AO-10
Outside air damper close
Electric heat stage 1
MDL05
Not used
MDL06
Electric heat stage 1
MDL04
Electric heat stage 2
MDL05
Not used
MDL06
Electric heat stage 2
MDL04
Electric heat stage 3
MDL05
Not used
MDL06
Electric heat stage 3
All
Exhaust fan relay (default) or auxilliary
heat relay
Notes:
1.
High pressure switch HP is not installed on AV/AH units.
These units are wired to provide a constant, no-fault
condition.
IM 613 / Page 23 (Rev. 5/00)
Table 14.
Inputs and Outputs for Program UV4***
Units (Models AZ or AV/AH)
Software
Connection Model
Component Description
Table 15.
Connection
Component Description
IN0
All
Tenant override or remote spt. adjust or
both (optional)
IN0
All
IN1
All
Room temperature sensor
IN1
All
Room temperature sensor
IN2
All
Discharge air temperature sensor
IN2
All
Discharge air temperature sensor
IN3
All
Outdoor air temperature sensor
IN3
All
Outdoor air temperature sensor
IN5
All
Water-in temperature sensor
IN5
All
Water-in temperature sensor
MDL07
Heating valve position
MDL09
Heating valve position
MDL08
F&BP damper position
MDL10
F&BP damper position
Heat/cool valve position
IN6
IN7
All
Outside air damper position
MDL11
DI-2
All
Day-night changeover device (optional)
MDL12
DI-3
All
Ventilation lockout (default) or exhaust
fan interlock (optional)
DI-4
All
➁➂
High pressure (HP) & low DX coil temp
(T4) switches
➀
Low water coil temperature switch (T6)
DI-4
F&BP damper position
IN7
All
Outside air damper position
DI-2
All
Day-night changeover device (optional)
DI-3
All
Ventilation lockout (default) or exhaust fan
interlock (optional)
All
Not used
DI-5
All
RO-1
All
Fan relay (R4)
MDL9
Not used
RO-2
All
Compressor relay (R1 on AZ, R7 on AV/AH)
MDL10
Not used
RO-3
All
Not used
MDL11
Low water coil temp switch (T6)
RO-4
All
Outside air damper open
RO-5
All
Outside air damper close
RO-6
RO-7
RO-8
AO-10
DI-5
MDL12
RO-1
All
Not used
Fan relay (R4)
MDL07
Heating valve close (extend)
MDL09
Not used
MDL08
F&BP damper close to face (extend)
MDL10
Not used
MDL07
Heating valve open (retract)
MDL11
Heat/cool valve close (extend)
MDL08
F&BP damper open to face (retract)
MDL12
Not used
MDL07
Not used
MDL09
Not used
MDL08
Heating EOC valve close (2-position, N.O.)
MDL10
Not used
All
Exhaust fan relay (default) or auxilliary heat
relay
MDL11
Heat/cool valve open (retract)
RO-2
RO-3
MDL12
Notes:
RO-4
1.
RO-5
3.
Software
Model
Tenant override or remote spt. adjust or both
(optional)
IN6
2.
Inputs and Outputs for Program UV5***
Units (Models AV/AH) (2 pipe)
Switch T6 is not installed on units with steam coils. These
units are wired to provide a constant, no-fault condition.
High pressure switch HP is not installed on AV/AH units.
Only low temperature switch T4 is connected to DI-14
on these units.
RO-6
High pressure switch HP and low temperature switch
T4 are wired in series on AZ units only.
RO-7
RO-8
AO-10
Not used
All
Outside air damper open
All
Outside air damper close
MDL09
Heating valve close (extend)
MDL10
F&BP damper close to face (extend)
MDL11
Not used
MDL12
F&BP damper close to face (extend)
MDL09
Heating valve open (retract)
MDL10
F&BP damper open to face (retract)
MDL11
Not used
MDL12
F&BP damper open to face (retract)
MDL09
Not used
MDL10
Heating EOC valve close (2-postition, N.O.)
MDL11
Not used
MDL12
Heat/cool EOC valve close (2-postition, N.O.)
All
Exhaust fan relay (default) or auxilliary heat
relay
Notes:
1.
IM 613 / Page 24 (Rev. 5/00)
Switch T6 is not installed on heating only units with steam
coils. Unit is wired to provide a constant, no-fault
condition.
Table 16.
Connection
Inputs and Outputs for Program UV6***
Units (Models AV/AH) (4 pipe)
Software
Model
Component Description
Table 17.
Certified
Connection
Inputs and Outputs for Program UV7***
Units
(Models AV/AH)
Drawing
Software
Model
Component Description
IN0
All
Tenant override or remote spt. adjust or both
(optional)
IN0
All
Tenant override or remote spt. adjust or both
(optional)
IN1
All
Room temperature sensor
IN1
All
Room temperature sensor
IN2
All
Discharge air temperature sensor
IN2
All
Discharge air temperature sensor
IN3
All
Outdoor air temperature sensor
IN3
All
Outdoor air temperature sensor
MDL13
Heating valve position
IN5
All
Water-in temperature sensor
MDL14
Hot Water-in temperature sensor
MDL15
Chilled water valve position
MDL13
Chilled water valve position
MDL16
F&BP damper position
MDL14
F&BP damper position
IN5
IN6
IN6
Chilled water valve position
MDL18
F&BP damper position
IN7
All
DI-2
All
Day-night changeover device (optional)
IN7
All
Outside air damper position
DI-3
All
Ventilation lockout (default) or
exhaust fan interlock ( optional)
DI-2
All
Day-night changeover device (optional)
DI-4
All
Not used
DI-3
All
Ventilation lockout (default) or exhaust fan
interlock (optional)
MDL13
Low water coil temp switch (T6)
DI-4
All
Not used
MDL14
Not used
MDL15
Low water coil temperature switch (T6)
Fan relay (R4)
MDL16
Not used
DI-5
RO-1
RO-2
RO-3
All
Outside air damper position
MDL17
MDL13
Chilled water valve open (extend)
MDL14
Chilled water EOC valve open (2-position, N.C.)
MDL13
Chilled water valve close (retract)
MDL14
Not used
MDL15
MDL16
EOC valve (2-position, N.C.)
MDL17
Chilled water valve open (extend)
RO-4
All
Outside air damper open
RO-5
All
Outside air damper close
RO-6
RO-7
RO-8
AO-10
DI-5
RO-1
RO-2
MDL17
Low water coil temperature switch (T6)
MDL18
Not used
All
Fan relay (R4)
Chilled water valve open (extend)
MDL13
Heating valve close (extend)
MDL18
F&BP damper close to face (extend)
MDL14
F&BP damper close to face (extend)
MDL15
Chilled water valve close (retract)
MDL13
Heating valve open (retract)
MDL16
Not used
MDL14
F&BP damper open to face (retract)
MDL17
Chilled water valve close (retract)
MDL13
Not used
MDL14
Heating EOC valve close (2-position, N.O.)
RO-4
Exhaust fan relay (default) or auxilliary heat relay
RO-5
All
RO-3
MDL18
Outside air damper open
All
Outside air damper close
MDL15
RO-6
RO-7
RO-8
AO-10
F&BP damper open to face (retract)
All
Not used
MDL16
F&BP damper close to face (extend)
MDL17
Electric heat stage 1
MDL18
Electric heat stage 1
MDL15
Not used
MDL16
F&BP damper open to face (retract)
MDL17
Electric heat stage 2
MDL18
Electric heat stage 2
MDL15
Not used
MDL16
Not used
MDL17
Electric heat stage 3
MDL18
Electric heat stage 3
All
Exhaust fan relay (default) or auxilliary heat
relay
IM 613 / Page 25 (Rev. 5/00)
Test Procedures
Table 18. Thermistor Chart
This section contains troubleshooting procedures for the
following:
°F
Ohms
Volts
°F
Ohms
Volts
°F
15
16,104
4.145
77
3,000
2.373
139
761
0.932
•
Microprocessor problems
16
15,627
4.124
78
2,927
2.343
140
746
0.917
•
Power supply problems
17
15,166
4.102
79
2,857
2.313
141
731
0.902
18
14,720
4.080
80
2,789
2.283
142
717
0.888
•
Erroneous temperature readings
19
14,288
4.057
81
2,723
2.253
143
703
0.874
•
Temperature sensor faults (codes 2, 10, 11, 12, 13, and
14)
20
13,871
4.034
82
2,658
2.223
144
689
0.859
21
13,467
4.011
83
2,595
2.194
145
676
0.846
•
Digital input faults (codes 3, and 5)
22
13,076
3.988
84
2,534
2.164
146
662
0.831
23
12,698
3.964
85
2,474
2.135
147
649
0.818
•
Brownout fault (code 6)
24
12,333
3.940
86
2,416
2.106
148
637
0.805
•
Actuator feedback faults (codes 7, 8, and 9)
25
11,979
3.915
87
2,360
2.077
149
625
0.792
26
11,636
3.890
88
2,305
2.049
150
613
0.779
27
11,304
3.865
89
2,251
2.020
151
601
0.766
28
10,983
3.839
90
2,199
1.992
152
589
0.753
29
10,672
3.814
91
2,149
1.965
153
578
0.741
30
10,371
3.788
92
2,099
1.937
154
567
0.729
31
10,079
3.761
93
2,051
1.909
155
556
0.717
32
9,797
3.734
94
2,004
1.882
156
546
0.706
If the LED does not illuminate, check that the UVC power supply
is intact (see “Power Supply Problems” below).
33
9,523
3.707
95
1,959
1.855
157
535
0.694
34
9,258
3.608
96
1,914
1.828
158
525
0.683
Status LED: Approximately 40 seconds after power is applied
to the UVC, the status LED should illuminate as shown in Table
1. If the LED fails to respond properly, either there is a software
problem or the UVC is defective. If a PC and the proper software
is available, try downloading new software. If this does not help,
the UVC is defective and must be replaced.
35
9,002
3.653
97
1,871
1.802
159
516
0.673
36
8,753
3.625
98
1,829
1.775
160
506
0.661
37
8,512
3.597
99
1,788
1.750
161
496
0.650
38
8,278
3.569
100
1,747
1.724
162
487
0.640
39
8,052
3.540
101
1,708
1.698
163
478
0.629
40
7,832
3.511
102
1,670
1.673
164
469
0.619
41
7,619
3.482
103
1,633
1.648
165
461
0.610
42
7,413
3.453
104
1,597
1.624
166
452
0.599
43
7,213
3.424
105
1,562
1.600
167
444
0.590
44
7,019
3.394
106
1,528
1.576
168
436
0.580
45
6,831
3.365
107
1,494
1.552
169
428
0.571
46
6,648
3.335
108
1,461
1.528
170
420
0.561
47
6,471
3.305
109
1,430
1.505
171
413
0.553
48
6,299
3.274
110
1,398
1.482
172
405
0.544
49
6,133
3.244
111
1,368
1.459
173
398
0.535
50
5,971
3.213
112
1,339
1.437
174
391
0.527
Verify that the main power switch is at “On.”
51
5,814
3.183
113
1,310
1.415
175
384
0.518
Check the voltage at the secondary of transformer X2 or
X3. It should be approximately 24 VAC (load dependent).
52
5,662
3.152
114
1,282
1.393
176
377
0.510
53
5,514
3.121
115
1,254
1.371
177
370
0.501
54
5,371
3.078
116
1,228
1.350
178
364
0.494
55
5,231
3.059
117
1,201
1.328
179
357
0.485
56
5,096
3.028
118
1,176
1.308
180
351
0.478
57
4,965
2.996
119
1,151
1.287
181
345
0.471
58
4,838
2.965
120
1,127
1.267
182
339
0.463
59
4,714
2.934
121
1,103
1.247
183
333
0.456
60
4,594
2.902
122
1,080
1.227
184
327
0.448
61
4,477
2.871
123
1,058
1.208
185
321
0.441
62
4,363
2.839
124
1,036
1.189
186
316
0.435
63
4,253
2.808
125
1,014
1.170
187
310
0.427
64
4,146
2.777
126
993
1.151
188
305
0.421
65
4,042
2.745
127
973
1.133
189
299
0.413
66
3,941
2.714
128
953
1.115
190
294
0.496
Determine the sensor’s analog input number. Refer to the
unit wiring diagram or to the input/output tables (Tables 11
through 17).
67
3,842
2.682
129
933
1.097
191
289
0.409
68
3,748
2.651
130
914
1.079
192
284
0.384
69
3,655
2.620
131
895
1.062
193
280
0.389
Remove the IDC connector from its UVC terminals and
measure the resistance of the sensor (through the IDC
connection). Using the thermistor chart (Table 18), compare
this value with the measured temperature.
70
3,565
2.589
132
877
1.045
194
275
0.382
71
3,477
2.558
133
859
1.028
195
270
0.376
72
3,392
2.527
134
842
1.012
196
266
0.371
73
3,309
2.496
135
825
0.995
197
261
0.364
74
3,228
2.465
136
809
0.980
198
257
0.359
75
3,150
2.434
137
792
0.963
199
252
0.353
76
3,074
2.404
138
777
0.948
200
248
0.348
•
Master/slave communication error fault (code 16)
Microprocessor Problems
The power and status LED indications can aid in UVC diagnostics.
Power LED: Immediately after power is applied to the UVC, the
watchdog LED should illuminate continuously.
Power Supply Problems
The UVC requires a 24 VAC power supply. It is connected to
the board at the section labeled “POWER” (terminal 6,24V). A
transformer steps down the line voltage to the required 24 VAC:
transformer X2 or X3 (line to 24 VAC). (Transformer X2 is used
only on units with compressors.) Refer to the unit wiring diagram.
If a problem with the UVC power supply is suspected, check the
following:
1.
2.
Transformer X3 provides auxiliary power for the UVC. It is used
for the digital input and relay output circuits. If the controller LED’s
are responding properly but the fan will not run, transformer X3
may be defective. Check the voltage at the secondary of transformer X3; it should be approximately 24 VAC.
Erroneous Temperature Readings
If it is suspected that the UVC is operating using erroneous
temperature data, the following procedure may be used to check
the sensors:
1.
2.
3.
Measure the temperature at the suspect sensor using an
accurate thermometer.
If the measured resistance and temperature match, go on
to step 4.
IM 613 / Page 26 (Rev. 5/00)
Ohms Volts
If the measured resistance and temperature do not match,
either there is a wiring problem or the sensor is defective.
Check the IDC connection and the sensor circuit wiring for
defects.
4.
Replace the connector and measure the DC voltage across
the sensor terminals. Using the thermistor chart, compare
this value with the measured temperature. If the measured
voltage and temperature match, the UVC may require
factory service, or it may be defective.
2.
Determine the switch’s digital input number. Refer to the
unit wiring diagram or to the input/output tables (Tables
Certified
Drawing
11 through 17).
3.
Check the wiring and connections throughout the digital
input circuit.
4.
Measure the resistance through the switch contacts (with
at least one wire disconnected). The “3-blink” switches
are normally closed, and the “5-blink” switches are
normally open (see Table 9).
If the measured voltage and temperature do not match, the
UVC is defective (this assumes sensor and circuit are intact).
Temperature Sensor Faults
The following procedure can be used to troubleshoot any of the
six faults that indicate a temperature sensor failure. This type of
fault has a 2, 10, 11, 12, or 13 blink fault code (see Table 9). It is
usually caused by an open or shorted sensor circuit.
1.
Determine the sensor’s analog input number. Refer to the
unit wiring diagram or to the input/output tables (Tables
11 through 17).
2.
Remove the IDC connector from its UVC terminals and
measure the resistance of the sensor (through the IDC
connection). Compare this value to the acceptable range
of values listed in the thermistor chart (Table 18).
If the measured resistance is within the acceptable range
of values, go on to step 3.
If the measured resistance is higher or lower than any
chart value, either there is a wiring problem or the sensor
is defective. Check the IDC connection and the sensor
circuit wiring for defects.
3.
Replace the connector and measure the DC voltage
across the sensor terminals.
If the reading is between 0.39 VDC ± 4% and 4.88 VDC ±
4%, the measured voltage is acceptable. Attempt to clear the
fault by cycling power to the UVC. If the fault does not clear,
the UVC may require factory service, or it may be defective.
If the reading is less than 0.39 VDC ± 4% or greater than
4.88 VDC ± 4%, the UVC is defective (this assumes
sensor and circuit are intact).
Digital Input Faults
The four possible digital input faults are triggered by either a
high pressure or low temperature switch. They are indicated by
a 3- or 5-blink fault code (see Table 9).
Note that an open switch causes a 3-blink fault code and a
closed switch causes a 5-blink fault code. Usually, a digital
input fault is caused by high pressure or low temperature alarm
conditions that are due to mechanical problems in the unit
ventilator. However, this type of fault could also be caused by a
problem in the digital input circuit.
Following is a procedure that may be used to check for problems in the digital input circuit. If the probable cause of the fault
is found using the procedure, attempt to clear the fault by
cycling power to the UVC. If the probable cause of the fault is
not found using the procedure, assume that mechanical
problems exist and have a qualified technician service the unit
before attempting to reset the UVC.
1.
Check the voltage at the secondary of transformer X3; it
should be approximately 24 VAC.
The alarm conditions that cause these faults should
return to normal fairly quickly. If the switch is not in its
normal position after a reasonable amount of time, it is
likely that the switch is defective.
Brownout Fault
A low line voltage condition is indicated by the 6-blink brownout
fault code.
The UVC senses AC voltage for brownout conditions. If the
line voltage to the unit of the phase used to provide power to
the units 24 VAC transformer drops by 20% below the units
nameplate value a brownout fault will occur. Once line voltage
returns to 10% below nameplate or higher normal operation
resumes.
If a brownout fault occurs, check the line voltage to the unit
ventilator. If it is less than 85% of the nameplate value, contact
the power company. If the line voltage remains greater than
85% of the nameplate value for more than 5 minutes but the
fault does not reset, perform the following:
1.
Check the primary and secondary voltages of power
supply transformers X2 or X3.
2.
Check for faulty wiring or connections throughout the
power supply circuit.
Actuator Feedback Faults
The following procedure can be used to troubleshoot any of the
three faults that indicate an actuator feedback failure. This type
of fault has a 7, 8, or 9 blink fault code (see Table 9). It is usually
caused by a defective actuator or a mis-wired feedback circuit.
1.
Estimate the amount of actuator extension by observing
the position of the valve or damper. Verify that the
actuator linkage is intact.
2.
Determine the feedback circuit’s analog input number.
Refer to the unit wiring diagram or to the input/output tables
(Tables 11 through 17).
3.
Leaving the connector in place, measure the DC voltage
across the input terminals. Compare this reading and the
observed actuator position with the information below.
4.
If the reading is between 0.2 ± 0.1 VDC and 3.68 ± 0.29
VDC, the measured voltage is acceptable. Attempt to clear
the fault by cycling power to the UVC. If the fault does not
clear, the UVC may require factory service, or it may be
defective.
If the reading is less than 0.1 VDC or greater than 3.97
VDC, check the wiring and connections between the
actuator and the UVC. Look for shorts or disconnections.
Referring to the unit wiring diagram, verify that the
feedback wires are terminated properly. If the wiring is
intact and the fault does not clear, go on to step 4.
IM 613 / Page 27 (Rev. 5/00)
Note: If the linkage is disconnected or damaged, it is
possible that the actuator could extend beyond the nominal full stroke of one-half inch. If it does, the feedback
voltage could exceed the acceptable upper limit.
5.
Remove the IDC connector from the analog input and
measure the DC voltage across the UVC terminals. It
should be approximately 5 VDC. If it is, the actuator is
defective. If it is not, the UVC is defective.
Note: Stroke endpoint parameters for each actuator are loaded
into the UVC at the factory and auto calibrated at each
power-up. If an actuator must be replaced, the stroke
endpoint parameters in the controller may need to be
reset. If nuisance alarms are occurring or if a valve or
damper will not fully close, obtain factory service.
Figure 6.
Barber-Colman Actuator Position Feedback Voltages
Data relating to the unit ventilator configuration and actuator
characteristics are stored at the factory when each unit is built
and tested. This information defines the program number,
software model, and several parameter settings that are
unique for each unit ventilator. If a UVC is defective and must
be replaced, its unit-specific software (defined by the above
data) must be loaded into the replacement controller.
If a PC is available, it may be possible to recover the software
from the defective UVC.
If a PC is not available or the software cannot be recovered,
the replacement UVC must be downloaded at the factory. To do
this, the factory needs the following information:
•
Full model number
•
Serial number
•
Job control number
This information is listed on the unit mounted dataplate. It must
be included with the replacement UVC part order.
160
140
Actuator Extension (%)
UVC Replacement
120
100
80
60
40
20
0
-20
0.0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
3.2
3.6
4.0
4.4
4.8
Voltage (VDC)
Notes:
1.
Extension percentage is based on 1/2-inch nominal full
stroke.
2.
Voltages are measured at UVC analog input terminals.
3.
Range of expected accuracy is defined by the dotted lines.
4.
Voltage at maximum possible actuator extension is 4.63
VDC (linkage disconnected).
Master/Slave Communication Error Fault
A master/slave communication error is indicated by a 16-blink
fault code. Troubleshooting this fault is limited to the following
checks:
•
Verification of master and slave UVC communication port
voltages
•
Verification of communications wiring integrity
•
Verification of network addressing
The best way to accomplish these checks is to perform the
master/slave start-up procedure. Refer to “Master/Slave” in the
“Start-up” section of this manual.
If all of the above checks have been performed and the UVC
will still not communicate, either the controller is defective or
factory service is required.
IM 613 / Page 28 (Rev. 5/00)
Valve And Damper Actuator Calibration
Procedures
directly connected to the controller you wish to work on,
and the controller is not a Master in a Master I Slave
Certified
Drawing
network, then the Controller Address 00.FF may be used.
Points to keep in mind about actuator calibration.
Actuator calibration must be performed...
•
after every actuator replacement
4.
On the Read/Write screen, in the Operation box select
the Monitor radio button by clicking on it. In the Display
box select the Decimal radio button by clicking on it.
•
after any linkage adjustment
5.
•
as a service test to verify proper operation when problems
are reported
•
if a program has been downloaded to the controller and
the previous calibration values were not saved
prior to program download.
Enter the following string of memory addresses into the
Memory Address box exactly as shown then press the
Enter key: 0212-0217,0A01-0A02,0204,0505-0507,09010902,091A-091B,0935-0936.
6.
Notice in the Read/Write area that the values located in
0A01 and 0A02 are identical. Write to 0A01 by clicking on
the value and change it to any value other than the value
at 0A02.
7.
Write a value of 4 to location 0204. This will reset the
controller. The program will stop; all outputs will go off.
If the software in your MicroTech 325 controller is version
6 or higher (UV**6*.COD), then calibration will be
automatically performed after every unit power cycle. If
your software has the auto calibration feature, the amber
LED will blink 3 seconds on, then 3 seconds off until calibration is complete. This feature is not implemented in
MicroTech 125 controllers
8.
Write 255 to location 0216, this will return a value of 1.
This will begin forcing the F&BP damper to the full
bypass position (or begin closing the valve).
9.
Watch memory location 0506 change, when this value
stops changing, the damper is in the full bypass position
(valve fully closed). On a sheet of paper, write this value
down for later use.
•
All actuators (version 5 software or lower) are factory calibrated during unit testing and need not be calibrated at
initial unit start-up unless changes are made to linkage
and or actuators are replaced
10.
Write a 0 to location 0216. Then write a 255 to location
0217, this will return a value of 1. This will begin forcing
the F&BP damper to the full face position (or begin
opening the valve).
•
The same memory addresses described in the procedures
above may also be accessed using the DOS Monitor
program
11.
•
ALWAYS, if damper or valve problems are reported, check
for damper blockages or linkage problems that prevent
full damper movement and or look for stuck or sticky
valves; correct any problems found then perform the
appropriate calibration procedure
Watch memory location 0506 change, when this value
stops changing, the damper is in the full face position (valve
fully opened). On a sheet of paper, write this value down for
later use.
12.
Write a 0 to location 0217.
13.
Using the Read/Write screen write the lowest value of
the two numbers you wrote down on the sheet of paper to
location 091A, then write the higher value to location 091B.
14.
Change location 0A01 to match 0A02.
15.
Reset the controller by writing 4 to location 0204.
16.
The controller should start its program and begin
operating normally.
•
•
If it appears that the controlled device is not working
properly use these procedures as a troubleshooting tool
to fully activate the controlled device then visually and or
mechanically verify proper operation
To perform the calibration procedures below you must have the
Windows Monitor program installed on a PC, the PC must be
connected with proper cabling to Port-A on the MicroTech
controller, and you must have established communication
between the PC and the controller. The cable kit required to
properly connect a 9-pin serial PC port to Port-A on a MicroTech
controller is P/N 057186802 which will contain cables P/N
067784501 and P/N 067784503.
You need to know which model of unit ventilator you will be
working with before performing any of the calibration procedures.
MicroTech 325 F&BP Damper and Water Valve Calibration
The following procedure is for Model 7-hot water valve, Model
8-F&BP damper, Models 9-hot water valve, Model 10-F&BP
damper, Model 12-F&BP damper, Model 14-F&BP damper,
and Model 16-F&BP damper.
Note: The same procedure is used for MicroTech 125 controllers except you must replace all instances of 0A01 with
8001, and replace all instances of 0A02 with 8002.
MicroTech 325 F&BP Damper and Water Valve Calibration
The following procedure is for Model 11-heat/cool water valve,
Model 13-cold water valve (not hot water valve), Model 15-cold
water valve, Model 17-cold water valve, and Model 18-F&BP
damper.
1.
Establish communications to the controller using a PC
with the Windows Monitor software and proper cables.
1.
Establish communications to the controller using a PC
with the Windows Monitor software and proper cables.
2.
2.
In the Windows Monitor program, go to Support menu
and choose Read/Write.
In the Windows Monitor program, go to Support menu
and choose Read/Write.
3.
3.
Make sure the address located in the Controller Address
box is the same as the UV you wish to work on. If you are
Make sure the address located in the Controller Address
box is the same as the UV you wish to work on. If you are
directly connected to the controller you wish to work on,
and the controller is not a Master in a Master I Slave
network, then the Controller Address 00.FF may be used.
IM 613 / Page 29 (Rev. 5/00)
4.
On the Read/Write screen, in the Operation box select
the Monitor radio button by clicking on it. In the Display
box select the Decimal radio button by clicking on it.
6.
5.
Enter the following string of memory addresses into the
Memory Address box exactly as shown then press the
Enter key: 0212-0217,0A01-0A02,0204,0505-0507,
0901-0902,091A-091B,0935-0936.
Notice in the Read/Write area that the values located in
0A01 and 0A02 are identical. Write to 0A01 by clicking on
the value and change it to any value other than the value
at 0A02.
7.
6.
Notice in the Read/Write area that the values located in
0A01 and 0A02 are identical. Write to 0A01 by clicking
on the value and change it to any value other than the
value at 0A02.
Write a value of 4 to location 0204. This will reset the
controller. The program will stop; all outputs will go off.
8.
Write 255 to location 0216, this will return a value of 1.
This will begin forcing the valve closed.
9.
Watch memory location 0505 change, when this value
stops changing, the valve is fully closed. On a sheet of
paper, write this value down for later use.
Enter key: 0212-0217,0A01-0A02,0204,0505-0507,
0901-0902,091A-091B,0935-0936
7.
Write a value of 4 to location 0204. This will reset the
controller. The program will stop; all outputs will go off.
8.
Write 255 to location 0212, this will return a value of 1.
This will begin forcing the F&BP damper to the full
bypass position (or begin closing the valve)
10.
Write a 0 to location 0216. Then write a 255 to location
0217, this will return a value of 1. This will begin forcing
the valve opened.
9.
Watch memory location 0506 change, when this value
stops changing, the damper is in the full bypass position
(or valve fully closed). On a sheet of paper, write this value
down for later use.
11.
Watch memory location 0505 change, when this value
stops changing, the valve is fully opened. On a sheet of
paper, write this value down for later use.
10.
Write a 0 to location 0212. Then write a 255 to location 0213,
this will return a value of 1. This will begin forcing the F&BP
damper to the full face position (or begin opening the valve).
12.
Write a 0 to location 0217.
13.
11.
Watch memory location 0506 change, when this value
stops changing, the damper is in the full face position (or
valve fully opened). On a sheet of paper, write this value
down for later use.
Using the Read/Write screen write the lowest value of
the two numbers you wrote down on the sheet of paper to
location 0935, then write the higher value to location 0936.
14.
Change location 0A01 to match 0A02.
15.
Reset the controller by writing 4 to location 0204.
16.
The controller should start its program and begin
operating normally.
12.
Write a 0 to location 0213.
13.
Using the Read/Write screen write the lowest value of the
two numbers you wrote down on the sheet of paper to
location 091A, then write the higher value to location 091B.
Note: The same procedure is used for MicroTech 125 controllers except you must replace all instances of 0A01 with
8001, and replace all instances of 0A02 with 8002.
14.
Change location 0A0l to match 0A02.
15.
Reset the controller by writing 4 to location 0204.
MicroTech 325 OA Damper Calibration
The following procedure is for all Models
16.
The controller should start its program and begin operating
normally.
1.
Establish communications to the controller using a PC
with the Windows Monitor software and proper cables.
Note: The same procedure is used for MicroTech 125 controllers except you must replace all instances of 0A01 with
8001, and replace all instances of 0A02 with 8002.
2.
In the Windows Monitor program, go to Support menu
and choose Read/Write.
3.
Make sure the address located in the Controller Address
box is the same as the UV you wish to work on. If you are
directly connected to the controller you wish to work on,
and the controller is not a Master in a Master/Slave
network, then the Controller Address 00.FF may be used.
4.
On the Read/Write screen, in the Operation box select
the Monitor radio button by clicking on it. In the Display
box select the Decimal radio button by clicking on it.
5.
Enter the following string of memory addresses into the
Memory Address box exactly as shown then press the
Enter key: 0212-0217,0A01-0A02,0204,0505-0507,
0901-0902,091A-0918.
6.
Notice in the Read/Write area that the values located in
0A01 and 0A02 are identical. Write to 0A01 by clicking on
the value and change it to any value other than the value
at 0A02.
7.
Write a value of 4 to location 0204. This will reset the
controller. The program will stop; all outputs will go off.
8.
Write 255 to location 0214, this will return a value of 1.
This will begin opening the OA damper.
MicroTech 325 Water Valve Calibration
The following procedure is for Model 13-hot water valve only
(not cold water valve)
1.
Establish communications to the controller using a PC
with the Windows Monitor software and proper cables.
2.
In the Windows Monitor program, go to Support menu
and choose Read/Write.
3.
Make sure the address located in the Controller Address
box is the same as the UV you wish to work on. If you are
directly connected to the controller you wish to work on,
and the controller is not a Master in a Master/Slave
network, then the Controller Address 00.FF may be used.
4.
On the Read/Write screen, in the Operation box select
the Monitor radio button by clicking on it. In the Display
box select the Decimal radio button by clicking on it.
5.
Enter the following string of memory addresses into the
Memory Address box exactly as shown then press the
IM 613 / Page 30 (Rev. 5/00)
9.
Watch memory location 0507 change, when this value stops
changing, the OA damper should be fully opened. On a
sheet of paper, write this value down for later use.
13.
10.
Write a 0 to location 0214. Then write a 255 to location
0215, this will return a value of 1. This will begin closing the
OA damper.
14.
11.
12.
Watch memory location 0507 change, when this value stops
changing, the OA damper is fully closed. On a sheet of paper, write this value down for later use.
Write a 0 to location 0215.
Using the Read/Write screen write the lowest value of the
two numbers you wrote down on the sheet of paper to
Certified
Drawing
location 0901, then write the higher value to location 0902.
Change location 0A01 to match 0A02.
15.
Reset the controller by writing 4 to location 0204.
16.
The controller should start its program and begin
operating normally.
Note: The same procedure is used for MicroTech 125
controllers except you replace all instances of 0A01 with
8001, and replace all instances of 0A02 with 8002.
Notes:
IM 613 / Page 31 (Rev. 5/00)
®
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