TABLE OF CONTENTS
INTRODUCTION
G e n e r a l D e s c r i p t i o n
A
p
p
l
i
c
a
t
i
o
n
2
3
OPERATION
O p e r a t o r R e s p o n s i b i l i t i e s 3
N o m e n c l a t u r e 3
O p e r a t i n g S e q u e n c e 4
C o n t r o l S y s t e m 4
O p e r a t i n g C o n t r o l s 4
Control Component Summary
6
P r o t e c t i v e C o n t r o l s 7
S a f e t y C o n t r o l R e s e t 7
C o n t r o l C e n t e r
T e m p e r a t u r e S e c t i o n 9
R e l a y S e c t i o n 9
S w i t c h S e c t i o n .
C o n t r o l M o d u l e 9
C a p a c i t y C o n t r o l S y s t e m 10
V a n e O p e r a t i o n 10
M e t e r i n g V a l v e s
11
O
i
l
S
y
s
t
e
m
.
H o t G a s B y p a s s S y s t e m . 12
O p e r a t i n g t h e C h i l l e r 12
P r e l i m i n a r y C h e c k s 12
S t a r t i n g t h e C h i l l e r 13
O p e r a t i n g C h e c k s 13
S
h
u
t
d
o
w
n
14
MAINTENANCE
R o u t i n e M a i n t e n a n c e
L u b r i c a t i o n
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
T R O U B L E S H O O T I N G G U I D E
McQUAY CENTRIFUGAL OPERATING LOG.
M c Q U A Y S E R V I C E P R O G R A M S 24
18
18
18
18
18
18
19
19
INTRODUCTION
GENERAL DESCRIPTION
The
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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