AIRSYS WPUs communicate with the controller via either a 13 wire harness (ASLLC.2, ASLLC.2.48) or a set of ethernet cables (ASLLC.2A, ASLLC.2A.48). Incorrect/loose wiring may cause the system to malfunction without giving an alarm. Wire identification for all ASLLC models is given below. 


ASLLC.2


Wire #
Function
Correct Behavior
1
Compressor Signal
When asked for compressor:
240VAC across 1 and 4
2
Supply Fan Signal
240VAC across 2 and 4 (always on to provide power feedback, actual speed (0-10VDC) controlled by wire 11&12)
3
Heater Signal
When asked for Heater:
240VAC across 3 and 4
4
Signal Common
240VAC across 4 and L1. 0V across 4 and L2.
5
Alarm Common
 
6
Low Pressure Alarm
NC with 5. Opens when low pressure switch trips.
7
High Pressure Alarm
NC with 5. Opens when high pressure switch trips.
8
Air Pressure Differential Alarm
NC with 5. Opens when air pressure differential alarm trips
9
Fan O.L./AC Loss Alarm
NC with 5. Opens when Fan O.L. feedback or no power to fan
10
Damper Position
0-10VDC across 10 and 12. 0V = fully closed. 10V = fully open
11
Supply Fan Speed
0-10VDC across 11 and 12. 0V = stopped 10V = full speed
12
DC Ground

13
Damper Power
24VDC across 12 and 13 to power the damper actuator


ASLLC.2.48


Wire #
Function
Correct Behavior
1
Compressor Signal
When asked for compressor:
48VDC across 1 and 12
2
AC Loss Alarm
NC with 12. Opens when power loss relay (KA1) is open
3
Heater Signal
When asked for Heater:
48VDC across 3 and 12
4
Not used

5
Alarm Common
 
6
Low Pressure Alarm
NC with 5. Opens when low pressure switch trips.
7
High Pressure Alarm
NC with 5. Opens when high pressure switch trips.
8
Air Pressure Differential Alarm
NC with 5. Opens when air pressure differential alarm trips
9
Fan O.L./AC Loss Alarm
NC with 5. Opens when Fan O.L. feedback or no power to fan
10
Damper Position
0-10VDC across 10 and 12. 0V = fully closed. 10V = fully open
11
Supply Fan Speed
0-10VDC across 11 and 12. 0V = stopped 10V = full speed
12
DC Ground

13
Damper Power
24VDC across 12 and 13 to power the damper actuator


ASLLC.2A, ASLLC.2A.48


Wire #
Function
Correct Behavior
1
Compressor Signal
When asked for compressor:
24VDC across 1 and 4
2
Supply Fan Power Detection5 kΩ across 2 and 4 = AC supply fan
10 kΩ across 2 and 4 = DC supply fan
3
Heater Signal
When asked for Heater:
24VDC across 3 and 4
4
Signal Common

5
Alarm Common
 
6
Low Pressure Alarm
NC with 5. Opens when low pressure switch trips.
7
High Pressure Alarm
NC with 5. Opens when high pressure switch trips.
8
Air Pressure Differential Alarm
NC with 5. Opens when air pressure differential alarm trips
9
Fan O.L./AC Loss Alarm
NC with 5. Opens when Fan O.L. feedback or no power to fan
10
Damper Position
0-10VDC across 10 and 12. 0V = fully closed. 10V = fully open
11
Supply Fan Speed
0-10VDC across 11 and 12. 0V = stopped 10V = full speed
12
DC Ground

13
Damper Power
24VDC across 12 and 13 to power the damper actuator