Carrier 51CM - Manual

HEATING & COOLING
1988 Room Air Conditioners
51
Start-Up and Service Instructions
International Series
51CM,GM,ZM.CV,GY
CONTENTS
Page
START-UP ................................................................ 1
SERVICE . . 1
General Notes .. .1
Compressor Replacement 1
SAFETY REMINDERS ............................................ 2-5
Preventive Maintenance 2
System Cleaning ... .2
System Flushing . . . . .2
Physical and Electrical Data................................... 3
Compressors ... 4
Run Capacitors. . ..................... 4
Thermistors ... 4
Casing Dimensions .. .4
Capillary Data . 5
Capillary Insertion 5
DISASSEMBLY INFORMATION . . . . 6-17
Model 104's Casing . . . . 6
Models 304's/404's Casing ... 13
TROUBLESHOOTING GUIDE ... 18
START-UP
Refer to operating instructions in Owner’s Handbook
provided with room air conditioner
SERVICE
General Notes — These Start-Up and Service Instiac­
tions are provided to assist the trained and qualified
service technician in repaii ing or replacing components of
Carrier room aii conditioner models produced in 1988,
specifically International Series models (51CM,GM,ZM
Cooling Only, 51CV,GY Cooling and Electiic Heat)
Other Carriei models for prior yeais have separate Start-
Up and Service publications
IMPORTANT Repairing and servicing ah condi­
tioners can be hazardous for untiained individuals
The insti actions printed in this publication are for
properly ttained and qualified Carrier service tech­
nicians only
A WARNING
Befoi e working on any air conditioner, be sure to first
disconnect all electric power to the unit to avoid the
possibility of electiical shock and personal injury
Discharge capacitors beiore disconnecting, by shorting
acioss terminals
Shield coils with cardboard to protect hands against
injury from sharp metal edges when removing compres-
soi and other components
When disassembling wiring, use numbered stickers to
identify wiie leads and terminals This aids in quick,
accurate reassembly
Check clearances around scroll and housing before
installing fans Before securing fan setscrews, rotate fan
by hand to ensure ample clearance
Refer to Carriei Standard Service Techniques,
Chapters 1 and 2, for information on checking motors,
removing refrigerant, adding oil, evacuating, dehydrating
and charging system Pay particular attention to all saiety
warnings for these procedures
Compressor Replacement — Stand clem ofcom-
ptessoi tetminals when wotking on comptessors With
system imdef piesswe, terminals mar blow Observe
the same safety procedures for rotary compressors as
for reciprocating compressors
When changing compressors
1 Follow all safety codes Reminder use protective
goggles, work gloves and water-soaked quenching
cloth
Shut off electric power and remove wiring irom
compressor
Purge or remove all refrigerant and pressure from
system
Cut suction and discharge lines Use tubing cutter at
convenient location on tubing, near compressor, to
ease reassembly using copper slip couplings
Remove compressor from unit Protect compressor
irom heat and carefully unbraze piping stubs
A CAUTION
Oil vapor in piping stubs can ignite irom torch
flame and cause serious injury Exercise extreme
care when brazing, and keep brazingcloth and fire
extinguisher handy for emergency use
9
10
Install oil piping stubs on new compressor and care­
fully braze into place
Clean system add or replace liquid line filter drier
Reiei to System Cleaning, and System Flushing
Install new compressor and braze into place with
field-supplied copper slip couplings
Connect wiring, replace wire terminals if necessary
Proceed with evacuation, charging and start-up
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations
PC131 Catalog No 535-134 PrintedinUSA Form51-20SS Pgl 7-88 Replaces:New
For replacement Items use Carrier Specified Parts
Book 1 4
Tab 8a 10a