Carrier 73Y - Manual

HEATING & COOLING
73X,Y
1993 Room Air Conditioners
Start-Up and Service Instructions
CONTENTS
Page
START-UP................................................................. 1
SERVICE ...................................................................1,2
General Notes ........................................................... 1
Compressor Replacement ....................................... 2
SAFETY REMINDERS............................................... 2
PREVENTIVE MAINTENANCE ............................... 2-4
General .......................................................................2
System Cleaning/Flushing.......................................2
DISASSEMBLY INFORMATION .......................... 5 12
Filter Removal ........................................................... 5
Front Grille Removal ............................................... 5
Control Box Removal.............................................. 5
Thermostat Bulb Heater Removal ........................ 7
Mode Switch Control Removal............................... 7
Timer Assembly Removal
(Models 73YCA213P and 73YCA243P
Only)....................................................................... 7
Capacitor Removal ................................................. 7
Indicator Light Removal
(Models 73YCA213P and 73YCA243P
Only)....................................................................... 8
Indoor Thermostat Removal ................................. 8
Fan Cycle Switch (Energy Saver Switch)
Removal ................................................................. 8
Air Sweep Switch Removal
(Models 73YCA213P and 73YCA243P
Only)....................................................................... 8
Chassis Removal .................................................... 8
Air Sweep Motor Removal
(Models 73YCA213P and 73YCA243P
Only)....................................................................... 8
Evaporator and Condenser Coils Removal ... 8
Air Handling System Removal .............................. 9
Exhaust Door Removal .......................................... 9
Vent Door Removal
(Models 73YCA213P and 73YCA243P
Only)....................................................................... 9
Indoor Blower Wheel Removal.............................. 10
Outdoor Propeller Fan Removal............................ 10
Fan Motor Removal ............................................... 11
Compressor Removal ............................................ 11
Strainer Removal and Replacement..................... 11
Electric Heater Assembly Removal ..................... 11
SERVICE POINTS ................................................... 13
TROUBLESHOOTING ..............................................14
START-UP
Refer to operating instructions in Owner’s Guide pro­
vided with room air conditioner
SERVICE
General Notes — These Start-Up and Service Instruc­
tions are provided to assist the trained and qualified service
technician in repairing or replacing components of Carrier
room air conditioner model offerings for 1993. These
instructions contain disassembly photos for the Models
73XC,XH, and YC. Unit physical data is found in
Tables 1-9.
IMPORTANT; Repairing and servicing air condition­
ers can be hazardous for untrained individuals. The
instructions printed in this publication are for prop­
erly trained and qualified Carrier service technicians
only.
A WARNING
Before working on any air conditioner, be sure to first
disconnect all electric power to the unit to avoid the
possibility of electrical shock and personal injury.
Discharge capacitors before disconnecting, by shorting
across terminals.
Shield coils with cardboard to protect hands against in­
jury from sharp metal edges when removing compressor and
other components.
When disassembling wiring, use numbered stickers to iden­
tify wire leads and terminals. This aids in quick, accurate
reassembly.
Check clearances around scroll and housing before in­
stalling fans. Before securing fan(s) fasteners, rotate fan by
hand to ensure ample clearance.
Refer to Carrier Standard Service Techniques, Chapters
1 and 2, for information on checking motors; removing
refrigerant; adding oil; and evacuating, dehydrating, and charg­
ing system. Pay particular attention to all safety warnings
for these procedures.
NOTE: In Carrier Standard Service Techniques, refrigerant
removal must always include reclaiming the refrigerant, not
allowing it to escape to the atmosphere.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
BookM 14 PC 131 Catalog No 537-320 Printed in U S.A Form 73X,Y-1SS Pg 1 3-94 Replaces: New
Tab 8a 10a