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TGZ 040A
McQuay TGZ 040A User Manual
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OMM
TGZ-1
TGZ 040A throu
gh TGZ 190A
17
Figure 5, Contro
l Center Layout
(3) 1
20V/24V
Transf
ormers
LineV/120V
Control
Transf
ormer
Control
Transf
ormer
Fuses, Primary
Control
Transf
ormer
Fuse, Secondary
Optional Disco
nnect
Switch
Microtech I
I
Controller
(2) Circuit
Mechanical
Hi-Pressure Switch
Relays
(4) Compressor
Contactors
Grounding Lug
Location for
Optional External
Overloads
7/8-in. KO for
control wiring
Switch
es
On Side
KO for P
ow
er
W
iring
16
18
Table of Contents
Default Chapter
2
Table of Contents
2
Introduction
3
General Description
3
Nomenclature
3
Water Pressure Drop
3
TGZ Scroll
4
TGZ Electrical Data
7
Field Wiring Diagram
16
Start-Up and Shutdown
18
Pre Start-Up
18
Start-Up
18
Weekend or Temporary Shutdown
19
Start-Up after Temporary Shutdown
19
Extended Shutdown
19
Start-Up after Extended Shutdown
19
Sequence of Operation
20
Microtech II Controller
23
TGZ Controller Software Version
23
General Description
23
Inputs and Outputs
25
Large PCO2/PCO3 Controller
25
Expansion I/O Controller
27
Setpoints
27
Events & Alarms
30
Protection (Shutdown) Alarms
30
Alarms and Events
30
Unit Stop Alarms
30
Limit Events
34
Controller Operation
37
EXV Control
52
Using the Controller
53
Menu Screens
55
Menu Descriptions
55
BAS Interface
72
Optional Controls
74
Part Winding Start
74
Phase/Voltage Monitor (Optional)
74
Hot Gas Bypass (Optional)
74
System Maintenance
76
General
76
Electrical Terminals
77
Operating Limits
77
Compressor Oil
77
Oil Equalization
78
Sightglass and Moisture Indicator
78
Crankcase Heaters
78
System Service
79
Filter-Driers
79
Liquid Line Solenoid Valve
79
Troubleshooting Chart
80
4
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McQuay TGZ 040A Specifications
General
Brand
McQuay
Model
TGZ 040A
Category
Water Heater
Language
English
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