Control System Components
External Chilled Water
Setpoint (ECWS)
The External Chilled Water Setpoint allows the chilled water setpoint to be changed from a remote location. The External Chilled Water Setpoint is found on 1A16
WPSR (WFC Water Pressure Sensing Option)
External Current Limit Setpoint
The External Current Limit is an option that allows the current limit setpoint to be changed from a remote location. The External Limit Setpoint is found on 1A16
Default 40 to 100%, adjustable via service tool.
1A21 Optional Dual | WPSR = WFC | Signal #1 | Evaporator Differential | Not for field use |
Analog Input or output |
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Module |
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1A21 Optional Dual | WPSR = WFC | Signal #2 | Condenser Differential | Not for field use |
Analog Input or output |
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| Water Pressure |
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Module |
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Module Characteristics
1A1, 1A2 Power Supply :
Unit Control Power Supply Module Converts 27 vac to 24 vdc.
Power Input Voltage: 23VRMS minimum, 27VRMS Nominal, 30VRMS maximum
Frequency:
Current: Full load 27 VAC – 4.30 A (RMS)
Inrush 27 VAC (RMS) ~ 30A (RMS)
Power Output: Class II Voltage 24 VDC, Rated Current 2.44 Amps.
Fused at 3 amps (FUS01513)
1A3, 1A5, 1A10 Dual Relay Output modules :
Relay #1
Relay #2 J2 4 NO,
Relay Outputs at 120 VAC: 7.2 Amps resistive, 2.88 Amps pilot duty, 1/3 HP, 7.2 FLA at 240 VAC: 5 Amps general purpose, 14 - 26 AWG with a maximum of two 14 AWG.
Power, 24 +/- 10 percent VDC, 60 mA maximum, Trane IPC3 protocol.
1A4, 1A6 Dual High Voltage Binary input module:
Binary Input Signal #1
Binary Input Signal #2
High Voltage Binary Input: Off
Voltage: 0 to 40 VAC RMS , On
Voltage: 70 to 276 VAC RMS
Input is not polarity sensitive (Hot and neutral can be switched), Input impedance 130K to 280K ohms
14 - 26 AWG with a maximum of two
14 AWG
Power, 24 +/- 10 percent VDC, 20 mA maximum. Trane IPC3 protocol.
1A7 High Power Output Module Relay contacts at 120 VAC:
16 amps resistive, 6.4 amps,pilot duty, 1 HP
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