20 WGZ030D through WGZ200D OMM 1130
Table 4, Analog Outputs
# Description Output Signal Range
1 Cooling Tower Bypass Valve Position 0 to 10 VDC 0 to 100% Open
2 Cooling Tower VFD Speed 0 to 10 VDC 0 to 100%
3 Circuit #1 Electronic Expansion Valve 0 to 10 VDC 0 to 100%
4 Circuit #2 Electronic Expansion Valve 0 to 10 VDC 0 to 100%
NOTE: Analog outputs 3 & 4 are for R410A and R134a units only.
Table 5, Digital Inputs
The following parameters are digital inputs to this controller.
C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrigerant Dependent
# Description Type Signal Signal
1 Unit OFF Switch UT 0 VAC (Stop) 24 VAC (Auto)
2 Pump Down Switch #1 C1 0 VAC (Stop) 24 VAC (Start)
3 Evaporator Water Flow Switch UT 0 VAC (No Flow) 24 VAC (Flow)
*4 Motor Protection #1 (R22, R407c) C1 0 VAC (Fault) 24 VAC (No Fault)
*4 Open (R134a,R410a)
5 Open
6 Pump Down Switch #2 C2 0 VAC (Stop) 24 VAC (Start)
*7 Motor Protection #2 (R22,R407c) C2 0 VAC (Fault) 24 VAC (No Fault)
*7 Open (R134a,R410a)
*8 Open (R22,R407c)
*8 Condenser Water Flow Switch (R134a,R410a) UT 0 VAC (No Flow) 24 VAC (Flow)
9 Phase Voltage Fault #1 (See Note 1 Below) C1 0 VAC (Fault) 24 VAC (No Fault)
10 Phase Voltage Fault #2 (See Note 1 Below) C2 0 VAC (Fault) 24 VAC (No Fault)
11 Ground Fault Prot. #1 (See Note 2 Below) C1 0 VAC (Fault) 24 VAC (No Fault)
12 Ground Fault Prot. #2 (See Note 2 Below) C2 0 VAC (Fault) 24 VAC (No Fault)
13 Remote Start/Stop UT 0 VAC (Stop) 24 VAC (Start)
*14 Condenser Water Flow Switch(R22,R407c) UT 0 VAC (No Flow) 24 VAC (Flow)
*14 Open (R134a,R410a)
*15 Open (R22,R407c)
*15 Motor Protection #1 (R134a,R410a) C1 0 VAC (Fault) 24 VAC (No Fault)
*16 Open (R22,R407c)
*16 Motor Protection #2 (R134a,R410a) C2 0 VAC (Fault) 24 VAC (No Fault)
17 Ice Mode Switch UT 0 VAC (Normal) 24 VAC (Ice)
18 Heat Mode Switch UT 0 VAC (Normal) 24 VAC (Heat)
Notes:
1. See Safety Alarms Table for “Phase Voltage Protection”. Units with single point electrical connection will have one PVM with
Inputs 9 and 10 wired together. Units with multiple point connection will have two PVM’s with Input 9 for Electrical Circuit #1 and
Input 10 for Electrical Circuit #2.
2. See Safety Alarms Table for “Ground Fault Protection”. Units with single point electrical connection will have one GFP with
Inputs 11 and 12 wired together. Units with multiple point connection will have two GFP’s with Input 11 for Electrical Circuit #1
and Input 12 for Electrical Circuit #2.
Table 6, Digital Outputs
The following parameters are digital outputs from this controller.
C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit, *n = Refrigerant Dependent
# Description Type Load Output OFF Output ON
1 Alarm C1,C2,UT Alarm Indicator Alarm OFF Alarm ON
2 Evaporator Water Pump UT Pump Contactor Pump OFF Pump ON
3
Condenser Fan #1 – Water Cooled = N /
Condenser Water Pump – Water Cooled = Y
C1 / UT
Fan Contactor/
Pump Contactor
Fan OFF Fan ON
4 Motor Control Relay #1 = Compr#1 C1 Starter Compressor OFF Compressor ON
Continued next page.
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