McQuay WMC Service Manual

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

McQuay WMC Specifications

General

Brand	McQuay
Model	WMC
Category	Chiller
Language	English