Unit installation
IOMM ACZ/AGZ-3 ACZ / AGZ-BM 93
Table 49, Digital Inputs
# Description Type Signal Signal
1 Unit Switch UT 0 VAC (Stop) 24 VAC (Auto)
2 Pump Down Switch #1 C1 0 VAC (Stop) 24 VAC (Start)
3 Evaporator Flow Switch UT 0 VAC (No Flow) 24 VAC (Flow)
4 Stage #1 C1 0 VAC (Off) 24 VAC (On)
5 Stage #2 C2 0 VAC (Off) 24 VAC (On)
6 Pump Down Switch #2 C2 0 VAC (Stop) 24 VAC (Start)
7 Stage #3 C1 0 VAC (Off) 24 VAC (On)
8 Stage #4 C2 0 VAC (Off) 24 VAC (On)
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 Stage #5 C1 0 VAC (Off) 24 VAC (On)
15 Mechanical High Pressure #1 C2 0 VAC (High Pressure/Off) 24 VAC (OK )
16 Mechanical High Pressure #2 C2 0 VAC (High Pressure/Off) 24 VAC (OK )
17 Stage #6 C2 0 VAC (Off) 24 VAC (On)
18 Open
NOTES:
1. C1 = Refrigerant Circuit #1, C2 = Refrigerant Circuit #2, UT = Unit
2. 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.
3. 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 50, Digital Outputs
# Description Type Load Output OFF Output ON
1 Alarm
C1,C2,
UT
Alarm Indicator Alarm OFF Alarm ON
2 Evaporator Fan Relay UT Pump Contactor Pump OFF Pump ON
3 Motor Control Relay #1 = Compr#1 C1 Starter Compressor OFF Compressor ON
4 Motor Control Relay #2 = Compr#2 C2 Starter Compressor OFF Compressor ON
5 Motor Control Relay #3 = Compr#3 C1 Starter Compressor OFF Compressor ON
6 Motor Control Relay #4 = Compr#4 C2 Starter Compressor OFF Compressor ON
7 Liquid Line #1 C1 Solenoid Cooling OFF Cooling ON
8 Motor Control Relay #5 = Compr#5 C1 Starter Compressor OFF Compressor ON
9 Motor Control Relay #6 = Compr#6 C2 Starter Compressor OFF Compressor ON
10 Condenser Fan #1 C1 Fan Contactor Fan OFF Fan ON
11 Condenser Fan #2 C2 Fan Contactor Fan OFF Fan ON
12 Liquid Line #2 C2 Solenoid Cooling OFF Cooling ON
13 Condenser Fan #3 C1 Fan Contactor Fan OFF Fan ON
14 Hot Gas Bypass #1 C1 Solenoid Cooling OFF Cooling ON
15 Hot Gas Bypass #2 C2 Solenoid Cooling OFF Cooling ON
16 Condenser Fan #4 C2 Fan Contactor Fan OFF Fan ON
17
Condenser Fan #5
(–8 Fans Only)
C1 Fan Contactor Fan OFF Fan ON
18
Condenser Fan #6
(–8 Fans Only)
C2 Fan Contactor Fan OFF Fan ON