IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 50 www.DaikinApplied.com
Table 43: 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 C1 0 VAC (Fault) 24 VAC (No Fault)
*4 Open
5 Open
6 Pump Down Switch #2 C2 0 VAC (Stop) 24 VAC (Start)
*7 Motor Protection #2 C2 0 VAC (Fault) 24 VAC (No Fault)
*7 Open
*8 Open
*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 UT 0 VAC (No Flow) 24 VAC (Flow)
*14 Open
*15 Open
*15 Motor Protection #1 (R134a,R410A) C1 0 VAC (Fault) 24 VAC (No Fault)
*16 Open
*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)
NOTE: 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.
NOTE: 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 44: 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
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