Installation, Operation and Maintenance Manual
VariCool
®
VAV
3
Subject to change without notice.
10.20-IM (0818)
Contents
Contents � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 3
Wiring Diagram � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 4
Important Notice� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
Use of Symbols� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 5
General Information � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 6
EQUIPMENT INSPECTION 6
HANDLING 6
LOCATION AND CLEARANCES 6
UNIT DIMENSIONS 7
UNIT WEIGHT � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 9
UNIT INSTALLATION � � � � � � � � � � � � � � � � � � � � � � � � � � � 10
Vibration Absorbers 10
Refrigerant Connections 10
Duct Connections 12
Water Piping / Water Flow 12
Water Connections 12
Recommended Field Installed Externally� � � � � � � � � � � 12
Condensate Drain Connection 12
ELECTRICAL CONNECTIONS 13
SINGLE POINT DISCONNECT (OPTION) 13
SERVICE DISCONNECT 13
Supply Air Temperature Sensor 14
Return Air Temperature Sensor (Option) 14
Duct Mount Installation 14
Wall Mount Installation 14
Return Air Sensor Wiring 15
Return Air RH Sensor (Option) 15
Outdoor Air Sensor (Option) 15
Duct Mount Installation 15
Outdoor Air Sensor Wiring 15
Return Air RH Sensor (Option) 15
High Static Pressure Switch 15
Remote Alarm Output (Option) 16
Remote Water Pump (Option) 16
O/A Damper Control (Option) 16
Smoke Detector/Fire Stat (Option) 16
Remote On/Off Control (Option) 16
SEQUENCE OF OPERATION 16
MARVEL PLUS CONTROLLER 16
Maintenance Procedures� � � � � � � � � � � � � � � � � � � � � � � � 17
Filters� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17
Cleaning The Water-Cooled Condenser� � � � � � � � � � � � 17
Blowers � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17
Blower Motors� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 17
Blower Speed Adjustment � � � � � � � � � � � � � � � � � � � � � � � 18
Blower Bearing Lubrication� � � � � � � � � � � � � � � � � � � � � � 18
Belts� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 18
Refrigerant Systems� � � � � � � � � � � � � � � � � � � � � � � � � � � � 19
Evaporator And Air-Cooled Condenser Coils � � � � � � � 19
Finned Coil Cleaning 19
Water Side Economizer Coil 20
Water Valves 20
Hard Start Kit 20
Checking Hot Gas Bypass Valve 20
Adjustment Of Hot Gas Bypass Valve 20
Sequence Of Operation Cooling - - Air-Cooled 21
Cooling - - Water-Cooled 21
Cooling - - Chilled Water 21
Heating (Other Than Heat Pump) 21
Heating (Heat Pump, Water Source) 21
Troubleshooting � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 22
Limited Warranty � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 26
Limited Warranty for Hermetic Compressors � � � � � � � 27
Limited Warranty Condensing Section � � � � � � � � � � � � 28
Limited Warranty for Hermetic Compressors � � � � � � � 29
Air-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 30
Start-Up Procedures
(R-410a Systems) 30–31
Air-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 32
Water-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 34
Start-Up Procedures
(R-410a Systems) 34–35
Water-Cooled Unit � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 36
VARICOOL - Model Number Designation � � � � � � � � � � � 38
Summary of Contents for VariCool VAV
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