2 PB
Table of Contents
INTRODUCTION 4
Important Safety Information 4
Personal Injury Or Death Hazards 5
Operation of Equipment in During Construction 7
Equipment Identication 8
Model and Serial Number Location 8
Model and Serial Number information is found on the Manufacturer’s DATA TAG, located on the front or top. 8
Model Number Reference Guide 9
Serial Number Reference Guide 10
SPECIFICATIONS 11
General Specications 11
Chassis Specications 9K, 12K 12
18K Dimensions 13
24K Dimensions 14
Electrical Data 15
Electrical Requirements 17
Electrical Ratings Table 17
Supply Air Flow and Data 19
OPERATION 21
Electronic Control Board Features 21
Electronic Sequence of Operation 22
Compressor Lock Out Time 23
Cooling Fan Delay 23
Heating Fan Delay 23
Fan Speed Change Delay 23
Room Air Sampling Feature 23
Low Voltage Interface Connections 23
Interface Connector Denitions 23
Remote Wall Thermostat 24
Remote Wall Thermostat Location 25
Desk Control 25
Auxiliary Fan Control 25
Unit Heat Control Operation - Heat Pump With Electric Heat 26
Refrigeration Sequence Of Operation 27
REMOVE AND INSTALL THE CHASSIS 29
Remove The Chassis 29
Servicing / Chassis Quick Changeouts 29
To Remove the Chassis from the Closet: 29
R-410A SEALED SYSTEM REPAIR 30
Refrigerant Charging 31
Undercharged Refrigerant Systems 32
Overcharged Refrigerant Systems 33
Restricted Refrigerant System 34
Sealed System Method of Charging/ Repairs 35
EXTERNAL STATIC PRESSURE 36
Checking External Static Pressure 36
Explanation of charts 37
Indoor Airow Data 37
Ductwork Preparation 37
Fresh Air Door 38
Checking Approximate Airow 38
Electric Heat Strips 38
COMPONENT TESTING 39
Hermetic Components Check 39
Reversing Valve Description And Operation 40
Testing The Reversing Valve Solenoid Coil 41
Checking The Reversing Valve 42
Touch Test Chart : To Service Reversing Valves 44
Compressor Checks 45
Compressor Replacement -Special Procedure in Case of Compressor Burnout 48
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General