McQuay WMH series

Installation & Maintenance Data IM 447-9
Group: WSHP
Part Number: 107225603
Date: June 2006
Installation & Maintenance Data
Console Water Source Heat Pump
Models WDA, WDB, WDD, WDE, WDF, WDG, WDH, WDS, WLA, WLB, WLC, WLL
WMA, WMB, WMC, WMD, WME, WMF, WMG, WMH, WMU, WMK, WML
Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Checking for Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,4
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cabinet Power Connections . . . . . . . . . . . . . . . . . . . . . . . 5
Water Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Cleaning & Flushing System . . . . . . . . . . . . . . . . . . . . . . . 7
Operating Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unit Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wiring Diagrams – Mark IV/AC-Units . . . . . . . . . . . . . . 9,10
Control Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Thermostats – Mark IV/AC-Units . . . . . . . . . . . . . . . . . . 12
Pump Restart Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
MicroTech Control Units . . . . . . . . . . . . . . . . . . . . . . . 14,15
Field Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Optional Outside Air Damper . . . . . . . . . . . . . . . . . . . . . 18
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18,19
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Contents
©2006 McQuay International
®

McQuay WMH series Specifications

General

Category	Heat Pump
Refrigerant	R-410A
Unit Dimensions	Varies by model
Weight	Varies by model
Series	WMH
Voltage Options	208/230V

Summary

Model Nomenclature

Checking for Damage

Installation

Unit Location

Installing the Unit

Step-by-step instructions for mounting and securing the unit chassis and backwrap.

Electrical Connections

Standard Electrical Connection

Details the standard method for making field electrical connections via a junction box.

Cord & Plug Electrical Connection (Field Installed)

Describes field installation of cord and plug connections, including disconnect switches.

Cabinet Power Connection (Field Installed)

Instructions for field-installing receptacle, fuses, and disconnect switch for power.

Water Connections

Unit Piping Connection

Specifies connections for supply and return water tubing to the unit.

ShutoffBalancing Valve

Piping

Cleaning and Flushing System

Operating Limits

General

General conditions for unit start-up, including temperature, flow rate, and voltage.

Air and Water Limits

Defines minimum and maximum limits for entering air and water temperatures and enthalpy.

Electrical Data

General

Operating Voltages

Lists voltage ranges for different unit configurations and their implications.

Unit Operation

Mark IVAC-Control Units

Details the Mark IV/AC control board, thermostats, and low voltage outputs.

Cooling or Heating - Auto Operation

Lockout Circuit

Information on safety lockout circuits for abnormal conditions like high pressure.

Remote Reset of Automatic Lockouts

Fault Retry To Minimize Nuisance Trips

Cooling or Heating Manual Operation

Typical Wiring Diagrams for Units with Mark IVAC Controls

Component Layout

Notes

Thermostat Connection Diagrams

7-Day Programmable Electronic Thermostat

Non-Programmable Electronic Thermostat

MicroTech Network Control System

Troubleshooting

Neither fan nor compressor runs

Lists potential causes and corrective actions when the fan or compressor does not operate.

Fan operates but compressor does not

Troubleshooting steps for when the fan runs but the compressor does not.

Maintenance