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 Identification 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 Specifications -A Models 11
SPECIFICATIONS 12
General Specifications -B Models 12
Chassis Specifications 9K, 12K 13
18K Dimensions 14
24K Dimensions 15
Electrical Data (208/ 230v 9K btu and 12K BTU) 16
Electrical Data (265v 9K and 12K BTU) 17
Electrical Requirements 20
Electrical Ratings Table 20
Supply Air Flow and Data 22
OPERATION 24
Electronic Control Board Features 24
Electronic Sequence of Operation 25
Compressor Lock Out Time 26
Cooling Fan Delay 26
Heating Fan Delay 26
Fan Speed Change Delay 26
Room Air Sampling Feature 26
Low Voltage Interface Connections 26
Interface Connector Definitions 26
Remote Wall Thermostat 27
Remote Wall Thermostat Location 28
Desk Control 28
Auxiliary Fan Control 28
Unit Heat Control Operation - Heat Pump With Electric Heat 29
General Knowledge Sequence Of Refrigeration 30
REMOVE AND INSTALL THE CHASSIS 32
Remove The Chassis 32
Servicing / Chassis Quick Changeouts 32
To Remove the Chassis from the Closet: 32
EXTERNAL STATIC PRESSURE 33
Checking External Static Pressure 33
Explanation of charts 34
Indoor Airflow Data 34
Ductwork Preparation 34
Fresh Air Door 35
Checking Approximate Airflow 35
Electric Heat Strips 35
TROUBLESHOOTING 36
Error Codes and Alarm Status 36
Electrical Troubleshooting Chart - Cooling 38
9K Btu, 12K Btu, & 18K Btu 38
24K Btu 39
Electrical Troubleshooting Chart - Heat Pump 40
Troubleshooting Chart - Cooling 41
COMPONENT TESTING 42
Capillary Tube and Check Valve Assy (Heat Pump Units) 42
Capillary Tube Assy (Cool Only Units) 43
Reversing Valve Description And Operation 44