McQuay PEH063 User Manual

TABLE OF CONTENTS
INTRODUCTION
General Description
Application
2
3
OPERATION
Operator Responsibilities
3
Nomenclature
3
Operating Sequence
4
Control System 4
Operating Controls
4
Control Component Summary
_’ :5; 6
Protective Controls 7
Safety Control Reset
7
Control Center
: 819
Temperature Section
9
Relay Section
9
Switch Section.
.9
Control Module
9
Capacity Control System 10
Vane Operation
10
Metering Valves id,’ 11
Oil System. 11,12
Hot Gas Bypass System. 12
Operating the Chiller 12
Preliminary Checks
12
Starting the Chiller
13
Operating Checks
13
Shutdown 14
MAINTENANCE
Routine Maintenance
Lubrication
15
15
Changing Oil Filter .............
Refrigerant Cycle. ..............
Electrical System ...............
Cleaning and Preserving ........
Seasonal Servicing ...............
Annual Shutdown ..............
Annual Start-up ................
Repair of System ................
Pumping Down ................
Pressure Testing ...............
Leak Testing ..................
Evacuation....................
Refrigeration Charging
..........
Pressure Relief Valve Replacement
Equipment Warranty
..............
Refrigerant Charts. ...............
ADJUSTMENTS
Current Limit Calibration ........
Temperature Calibration .........
Ramp-Up Calibration ...........
Pulse Rate Calibration ..........
Current Transformer Signal ......
Vane Speed Adjustment. ........
Load Recycling Thermostat Setting
Low Oil Temperature Thermostat
TROUBLESHOOTING GUIDE
,20-22
McQUAY CENTRIFUGAL OPERATING LOG. .23
McQUAY SERVICE PROGRAMS 24
.17, 18
18
18
18
18
18
19
19
INTRODUCTION
GENERAL DESCRIPTION
The
McQuay Model PEH Centrifugal Water Chillers are com-
plete, self-contained, automatically controlled water chilling
units. Each unit is completely assembled and factory tested
prior to shipment.
In the PEH series, each unit contains one compressor con-
nected to a condenser and evaporator. A sister model called
the PHH Heat Recovery Chiller is similar to the PEH models
except for the addition of a second split condenser for heat
recovery applications.
The PHH models are equipped with a hot gas bypass
system for operation at light cooling loads. This hot gas
system is standard on PHH units and optional for PEH
models.
The standard chillers use refrigerants 12 and 500 to reduce
the size and weight of the package and since they operate
at a positive pressure over the entire operation range, no
purge system is required.
The controls are completely prewired, adjusted and tested.
Only normal field connections such as piping, electrical and
pump interlocks, etc. are required thereby simplifying installa-
tion and increasing
reliablility. All necessary safety and
operating controls are factory installed in the control panel.
The six basic sizes of units are the
PEHO5O, 063, 079, 087,
100 and 126 and provide a capacity range from 80 tons to
1200 tons. The PEH050 is also applied with modified im-
pellers and are designed as PEH046 or PEH048. In this
manual all references to the PEH models will equally apply
to PHH models unless specifically referenced otherwise.
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McQuay PEH063 Specifications

General

Brand	McQuay
Model	PEH063
Category	Chiller
Language	English