McQuay MHC Standard Range User Manual

Page 2 of 36 / IM 985-1
Model Nomenclature
NOTE: For illustration purposes only. Not all options available with all models.
Please consult McQuay Sales Representative for specic availability.
Product Category
W = WSHP
Product Identier
MHC = Standard Range Console WSHP
MHW = Geothermal Range Console WSHP
Design Series
1 = A Design
2 = B Design
3 = C Design
4 = D Design
Nominal Capacity
007 = 7,000 BTU/h
009 = 9,000 BTU/h
012 = 12,000 BTU/h
015 = 15,000 BTU/h
018 = 18,000 BTU/h
Controls
B = MicroTech III Unit Controller
C = MicroTech III Unit Controller w/LonWorks Communication Module
D = MicroTech III Unit Controller w/BACnet Communication Module
Voltage
A = 115/60/1
E = 208-230/60/1
J = 265/60/1
Cabinet Type
F = Flat Top
S = Slope Top
Discharge Grille
2 = Standard Stamped
Louver
3 = Multi-Directional Grille
Blower Motor
01 = Standard
Discharge Air
T = Top
Return Air
B = Bottom Return (High Sill)
F = Front Return (Low Sill)
Cabinet Height
H = High Sill
L = Low Sill
W MHC 1 009 B E H B T 01 F2
Table of Contents
Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Receiving and Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11
Cleaning & Flushing Water System . . . . . . . . . . . . . . . 11
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . 12-22
Mechanical (Compressor) Heating Override to
Electric Heat Operation . . . . . . . . . . . . . . . . . . . . . . . . 13
Electrical Data (General) . . . . . . . . . . . . . . . . . . . . 12-13
Operating Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating Limits. . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14
MicroTech III Unit Controller . . . . . . . . . . . . . . . . 14-25
I/O Expansion Module . . . . . . . . . . . . . . . . . . . . . . . . . 15
MicroTech III Controller with Lon Module. . . . . . . . . 16
MicroTech III Controller with BACnet Module . . . . . 17
MicroTech III Unit Controller Terminal Locations &
Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
MicroTech III Unit Controller Terminal Locations . . . 19
L
onWorks Communication Module Placement . . . . . 20
Typical Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . 22-23
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Additional Accessories (General) . . . . . . . . . . . . . . . . . . . . 24
Thermostats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-29
Motorized Isolation Valve & Relay . . . . . . . . . . . . . . . 29
Pump Restart Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Multiple Unit Control Panel (MUCP) for Use With
MicroTech® III Unit Controller. . . . . . . . . . . . . . . . . . 29
Outside Air Dampers . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-34
The in and outs of R-410A. . . . . . . . . . . . . . . . . . . . . . 31
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
General Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Troubleshooting Refrigeration Circuit . . . . . . . . . . . . . 32
Cooling Refrigeration Circuit . . . . . . . . . . . . . . . . 33
Heating Refrigeration Circuit . . . . . . . . . . . . . . . . 33
Troubleshooting The WSHP Unit Operation . . . . . . . . 34
Troubleshooting the MicroTech III Unit Controller. . . 35
LED Status & Faults
Troubleshooting Reference . . . . . . . . . . . . . . . . . . 35
WARNING
This Installation and Maintenance bulletin is intended to provide the proper procedures for installing a McQuay Console
Water Source Heat Pump. Failure to follow these procedures can cause property damage, severe personal injury or death.
Additional, failure to follow these procedures can cause premature failure of this equipment or cause erratic unit operation,
resulting in diminished unit performance. Disregarding these directions may further lead to suspension or revocation of the
manufacturer's warranty.

McQuay MHC Standard Range Specifications

General

Brand	McQuay
Model	MHC Standard Range
Category	Heat Pump
Language	English