McQuay WMC Service Manual

IOM 1210-1 • MAGNITUDE
®
MODEL WMC CHILLERS 38 www.DaikinApplied.com
operaTIon
MODES Setpoints
Figure 44: MODES Setpoint Screen
NOTE: Grayed out setpoints do not apply to this model chiller.
Table 10: MODES Setpoint Settings
Description No. Default Range Password Comments
Compr # 2 Stage Sequence # 14 1
1,2, … (# of
Compressors)
M
Sets sequence number for # 2 compressor. If set to 1, it is always
rst to start. If set to 2, it is always second to start. (Note 1)
Compr # 2 Staging Mode 13 Normal
Normal, Efciency,
Pump, Standby
M
Normal uses standard sequencing, Efciency starts one
compressor on each unit, Pump starts all compressors on one
chiller rst, Standby uses this compressor only if another fails
Compr #1 Stage Sequence # 12 1
1,2, … (# of
Compressors)
M
Sets sequence number for # 1 compressor. If set to 1, it is always
rst to start. If set to 2, it is always second to start. (Note 1)
Compr #1 Staging Mode 11 Normal
Normal, Efciency,
Pump, Standby
M
Normal uses standard sequencing, Efciency starts one
compressor on each unit, Pump starts all compressors on one
chiller rst, Standby uses this compressor only if another fails
Maximum Compressors ON 10 1 1-8 M Total number of compressors allowed to run at one time
BAS Network Protocol 9 MODBUS
None, Local, BACnet,
LonWorks, MODBUS,
Remote
M Sets BAS Standard Protocol to be used, or LOCAL if none
Condenser Pump 6
Pump #1
Only
Pump #1 Only, Pump
#2 Only, Auto Lead, #1
Primary, #2 Primary
M
Pump #1 Only, Pump #2 Only, use only these pumps AUTO,
balance hours between #1 and #2 #1 Primary, #2 Primary, if
primary fails, use other
Evaporator Pump 5
Pump #1
Only
Pump #1 Only, Pump
#2 Only, Auto Lead, #1
Primary, #2 Primary
M
Pump #1 Only, Pump #2 Only, use only these pumps AUTO,
balance hours between #1 and #2 #1 Primary, #2 Primary, if
primary fails, use other
Control Source 3 Switches Switches, Local, BAS O Sets control source. See "Unit Enabling/Disabling" on page 20.
Unit Enable 1 OFF OFF, AUTO O
OFF, everything is off. AUTO, Evap pump on, comp, cond pump
and tower on as required to meet LWT
NOTES:
1. If both compressors have the same sequence number, they will automatically balance starts and run-hours.
2. Setpoints 11 through 14 display compressor staging strategy.

McQuay WMC Specifications

General

Brand	McQuay
Model	WMC
Category	Chiller
Language	English