Controller Inputs And Outputs - McQuay WMC Installation, Operation And Maintenance Manual

Controller Inputs and Outputs

The following tables list the controller inputs and outputs, both analog and digital.
Table 20: Controller, Analog Inputs
# Description
1 Reset of Leaving Water Temperature
2 Entering Evaporator Water Temperature
3 Entering Condenser Water Temperature
4 Leaving Condenser Water Temperature
5 Liquid Line Refrigerant Temperature
6 Demand Limit
7 Evaporator Water Flow
8 Condenser Water Flow
9 Optional Tower Sump Temperature
10 Leaving Evaporator Water Temperature
NOTE: "Sensor Range" in
Table 21: Controller, Digital Inputs
# Description
1 Unit OFF Switch
2 Remote Off/Enable
3 Mode Switch
4 Manual Off
5 Manual Off2
6 Manual Off3
7 Manual Off4
8 Quick Off (All Off)
9 Ground Fault
10 Ground Fault2
12 HATS Switch
13 External Fault
17 Evaporator Water Flow Switch
18 Condenser Water Flow Switch
Table 22: Controller, Analog Outputs
# Description
1 Cooling Tower Bypass Valve Position
2 Cooling Tower VFD Speed
3 EXV signal to IB Valve Control Bd.
4 Tower Control Reset
5 % Unit Load
NOTE: "Sensor Range" in
IOM 1210-1 • MAGNITUDE
Signal Source
4-20 mA Current
NTC Thermistor (10k@25°C)
NTC Thermistor (10k@25°C)
NTC Thermistor (10k@25°C)
NTC Thermistor (10k@25°C)
4-20 mA Current
4 to 20 mA Current
4 to 20 mA Current
NTC Thermistor (10k@25°C)
NTC Thermistor (10k@25°C)
Table 20 indicates the range of the input, NOT the operating range of the chiller.
0 VAC (Normal)
0 VAC (Quick Stop)
0 VAC (Alarm)
0 VAC (Alarm)
0 VAC (No Flow)
0 VAC (No Flow)
Output Signal
Table 22 indicates the range of the output, NOT the operating range of the chiller.
MODEL WMC CHILLERS
®
Signal
0 VAC (Stop)
0 VAC (Stop)
0 VAC (Off)
0 VAC (Off)
0 VAC (Off)
0 VAC (Off)
0 VAC (Off)
Configurable
0 to 10 VDC
0 to 10 VDC
0 to 10 VDC
0 to 10 VDC
0 to 10 VDC
54
Sensor Range
0 to 20°F
-58 to 212°F
-58 to 212°F
-58 to 212°F
-58 to 212°F
0-100 %RLA
0 to 10,000 gpm
0 to 10,000 gpm
-58 to 212°F
-58 to 212°F
Signal
24 VAC (Auto)
24 VAC (Enable)
24 VAC (Alternate)
24 VAC (Enable)
24 VAC (Enable)
24 VAC (Enable)
24 VAC (Enable)
24 VAC (Enable)
24 VAC (Off)
24 VAC (Off)
24 VAC (Enable)
Configurable
24 VAC (Flow)
24 VAC (Flow)
Sensor Range
0 to 100% Open
0 to 100%
0 to 100%
0 to 100% Mask Reset
0 to 125% (8V = 100%)
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