McQuay SWP 055

© 2001 McQuay International
Self-contained Air Conditioning System
Type SWP Vintage Sizes 18D thru 95D, 105E
Installation and Maintenance IM-708
Group: Applied Systems
Part Number: IM708
Date: February 2002
MEA
368-93-E

McQuay SWP 055 Specifications

General

Brand	McQuay
Model	SWP 055
Category	Air Conditioner
Language	English

Summary

Installation

Handling

Safe practices for moving and handling the unit during installation.

LocationService Access

Recommended clearances for unit installation, service, and maintenance access.

Refrigerant Piping

Pressure Relief Valves

Details on relief valves, set points, and vent piping requirements.

Typical Wiring Schematics

Figure 20. Power Schematic

Main power wiring schematic diagram for the unit.

Figure 21. Input Schematic, Discharge Air Control (DAC)

Figure 22. Input Schematic, Zone or Space Comfort Control (SCC)

Figure 23. Output Schematic, Actuator Control

Figure 24. Output Schematic, Auxiliary Fan StartStop Control

Figure 25. Output Schematic, Compressor Control

Figure 26. Output Schematic, Compressor Control (4 Compressors4, 5 or 6 Stage)

Figure 27. Output Schematic, Compressor Control (6 Compressors 6 Stage)

Standard Controls

High Pressure Switches

Description of high pressure switches and their operational function.

Low Pressure Switches

Description of low pressure switches and their operational function.

Compressor Motor Protector

Explanation of the compressor motor protection system and its operation.

Proof of Airflow Switch

Details the airflow switch and its role in unit operation and safety.

Frost Protection Switches

Explanation of frost protection switches for evaporator coil freeze-up prevention.

Clogged Filter Switch

Description of the clogged filter switch function and indication.

Adjustable Frequency Drive

System Check, Test and Start

General

General instructions for qualified personnel performing unit start-up.

Pre Start-up

Checklist of tasks to complete before unit operation.

Start-up

Initial steps for powering up and starting the unit.

Fan start-up

Compressor start-up

Economizer start-up

Hot water start-up

Expansion valve superheat adjustment

Refrigerant Charge

Variable air volume (VAV) start-up

Drive sheave alignment and belt tension

Final control settings

System Maintenance

Preventative Maintenance

Routine tasks to ensure system reliability and prevent issues.

Motor Bearings

Service and Warranty Procedure

In Warranty Return Material Procedure

Product Warranty

Check, Test and Start Procedure Form

INITIAL CHECK

Checklist of tasks to complete before unit operation.

START-UP

Compressor Readings

CONTROL CHECK

Compressor Low and High Pressure Cut-outs