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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53420015-01
Printed in U.S.A.
Form 42WKN-9SI
Pg 1
918
8-18
Replaces: 42WKN-8SI
Installation, Operation and Maintenance
Instructions
TABLE OF CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
CONTROLS DESCRIPTION . . . . . . . . . . . . . . . . . . . 7
Microprocessor Control Board . . . . . . . . . . . . . . . . 7
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
External Connections . . . . . . . . . . . . . . . . . . . . . . . 7
Microprocessor PCB Battery . . . . . . . . . . . . . . . . . 7
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Infrared Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Self Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Receiver Indicators . . . . . . . . . . . . . . . . . . . . . . . . . 7
PRE-INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 39
Unpack Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Blank Off Pieces . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Ceiling Opening Sizes . . . . . . . . . . . . . . . . . . . . . . 39
Positioning the Electro-Mechanical
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Hanger Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Installation Guide . . . . . . . . . . . . . . . . . . . . . . . . . . 39
• INSTALLATION GUIDE SETUP
Condensate Piping. . . . . . . . . . . . . . . . . . . . . . . . . 40
Duct Collars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Piping Installation . . . . . . . . . . . . . . . . . . . . . . . . . 40
Piping Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Terminal Strip Connections . . . . . . . . . . . . . . . . . 42
Fascia Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 52
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Pre-Start Checks . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Control Circuit Checks . . . . . . . . . . . . . . . . . . . . . 52
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . 54
• ELECTRO-MECHANICAL CONTROLS
• MICROPROCESSOR CONTROLS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
On/Off. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Fan Speeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Temperature Set Point . . . . . . . . . . . . . . . . . . . . . .54
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Battery Replacement . . . . . . . . . . . . . . . . . . . . . . .54
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Setting Jumper Links . . . . . . . . . . . . . . . . . . . . . . .55
Main Control Functions . . . . . . . . . . . . . . . . . . . . .55
• INDOOR FAN OPERATION
• TEMPERATURE CONTROL
• POWER FAILURE
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . .55
Maintenance Schedule . . . . . . . . . . . . . . . . . . . . . .55
• EVERY 3 MONTHS
• EVERY 6 MONTHS
• EVERY 12 MONTHS
Filter Removal and Cleaning . . . . . . . . . . . . . . . . .55
Recommended Spares . . . . . . . . . . . . . . . . . . . . . .55
DISASSEMBLY PROCEDURE . . . . . . . . . . . . . . . .56
Fan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Condensate Tray Removal. . . . . . . . . . . . . . . . . . .56
Condensate Pump Removal . . . . . . . . . . . . . . . . .56
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . .56
REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . .59
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install
and service air-conditioning equipment. See Fig. 1 for Propo-
sition 65 warning label.
Untrained personnel can perform basic maintenance such as
cleaning and replacing filters. All other operations should be
performed by trained service personnel. When working on
air-conditioning equipment, observe safety precautions in lit-
erature and on tags and labels attached to the unit.
1. The equipment has been designed and manufactured to
meet international safety standards but, like any mechan-
ical/electrical equipment, care must be taken to obtain
the best results.
AirStream™
42WKN08-36
Hydronic Ceiling Cassettes