Carrier 73TCA005101B Operating instructions

Start-Up and Service Instructions
CONTENTS Page
SAFETY REMINDERS .........................1
START-UP ....................................1
SERVICE ....................................1,2
General Notes ................................1
Compressor Replacement .....................2
PREVENTIVE MAINTENANCE ................2-4
General ......................................2
System Cleaning/Flushing ....................3
DISASSEMBLY INFORMATION ...............5-8
Filter Removal ................................5
Front Grille Removal ..........................5
Discharge Air Deck Removal ..................5
Accessing Control Box Components ..........5
Capacitor Removal ...........................6
Thermostat Removal ..........................6
Thermostat Bulb Heater Removal
(008P Unit Only) ............................6
Mode Selector Switch Removal ................6
Fan Cycle Switch (Energy Saver Switch)
Removal (008P Unit Only) ...................6
Wing Panel(s) Removal .......................6
Accessing Compressor, Fan Motor, Outdoor
Coil Sections ...............................7
Exhaust Feature (008P Unit Only) ..............7
Fan Motor Removal ...........................7
• OUTDOOR FAN
• INDOOR BLOWER WHEEL
SERVICE POINTS .............................9
TROUBLESHOOTING ........................10
SAFETY REMINDERS
1. Carry a fire extinguisher in your truck. Keep it within reach
when using a torch. Check fire extinguisher periodically
to be sure it is fully loaded and functional.
2. Know how to handle oxyacetylene equipment safely. Lock
the equipment in an upright position in the truck and at
the job site.
3. Use dry nitrogen or carbon dioxide to pressurize the sys-
tem for leak checking. Always use a good regulator. Be
careful not to exceed 150 psig test pressure in the her-
metic compressor.
4. Wear safety goggles and gloves when recovering refrig-
erant from a system.
5. Attend shop safety meetings.
START-UP
Refer to operating instructions in Owner’s Guide pro-
vided with room air conditioner. Refer to Table 1 for specific
model number information to properly service, maintain, and
disassemble the unit.
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 1993-1995. Room
air-conditioning models are cooling-only units. These in-
structions contain disassembly photos for Model 73TC
(SiestatI and Siesta II). A typical 73TC unit is shown in
Fig. 1. Unit physical data is found in Tables 2-8.
IMPORTANT: Repairing and servicing air condition-
ers can be hazardous for untrained individuals. The in-
structions printed in this publication are for properly
trained and qualified Carrier service technicians only.
Before working on any air conditioner, be sure to first
disconnect all electric power to the unit to avoid the pos-
sibility of electrical shock and personal injury.
Before disconnecting, discharge capacitors by shorting ca-
pacitors 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.
C
OOL
ER
Fig. 1 — Model 008P
73TC
1993-1995 Room Air Conditioners
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 8a 10a PC 131 Catalog No. 537-327 Printed in U.S.A. Form 73TC-1SS Pg 1 1-96 Replaces: New

Table 1 — Model Number Nomenclature
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 recovering the refrigerant, not
allowing it to escape to the atmosphere.
Compressor Replacement
Stand clear of compressor terminals when working on
compressors. With system under pressure, terminals may
blow causing personal injury.
Observe the same safety procedures for rotary compres-
sors as for reciprocating compressors.
When changing compressors:
1. Follow all safety codes. Reminder: use protective goggles,
work gloves, and water-soaked quenching cloth.
2. Shut off all electrical power to unit by removing power
cord from outlet, then disconnect all wiring from the
compressor.
3. Apply field-supplied tap-a-lines to the true (closest to
compressor) suction and discharge connections of the
compressor.
4. Recover the refrigerant charge from the unit. After re-
covering, cut the discharge and suction line process tubes
below the tube crimps. If you choose a good tubing
location for cutting the refrigerant lines initially, the lo-
cation is easily accessible when making the final joints.
You can braze the oil piping stub into the new compres-
sor fittings more easily before the compressor is put back
into the unit.
Oil vapor in piping stubs can ignite from torch flame
and cause serious injury. Exercise extreme care when
brazing, and keep brazing cloth and fire extin-
guisher handy for emergency use.
5. Connect a nitrogen supply to the unit at one of the tap-
a-line connectors (5 psig maximum flow), leaving the
other connector open to the atmosphere. Braze angle valves
with stubs to each process tube.
6. Remove compressor from unit. Refer toAccessing Com-
pressor, Fan Motor, Outdoor Coil Sections, page 7.
7. Remove tap-a-lines from suction and discharge lines. Care-
fully braze the holes closed from where the tap-a-lines
were removed.
8. For proper cleaning and flushing, use the Carrier
Totalclaimtrecovery system or a comparable refriger-
ant recycling system.
9. Install new compressor and braze into place with field-
supplied copper slip couplings.
10. Connect wiring: replace wire terminals if necessary.
11. Proceed with evacuation and charging. Pinch off lines
where angle valves were added. Cut off angle valves above
pinch-off, and braze tubes.
12. Start up unit.
PREVENTIVE MAINTENANCE
General
CLEANING — Clean cooling coil and condenser (outdoor)
coil. Hold flashlight behind coil to see if all spaces are clear.
Use a hooked wire to remove dirt. Dust accumulation ob-
structs or reduces airflow and results in loss of capacity. Coils
may be vacuumed when dry. Outdoors, unit can be brushed
with a stiff brush and fins blown out with compressed air.
Thoroughly clean basepan, motors, fan wheels, other com-
ponents, and all drain passages. Vacuum insulation. Clean
all inside painted surfaces with mild detergent to remove grease.
Clean cabinet and grille. Mild detergents reduce electro-
static charges on plastic sections of the grille and are good
cleaners. Do not use carbon tetrachloride, solvents, or waxes
containing solvents to clean plastic sections.
PAINTING — Paint any parts that show evidence of rust
with a good rust-resistant paint.
WIRING — Check all wiring for deterioration and all elec-
trical contacts for tightness and lack of corrosion.
MOUNTING — Make sure unit is secure in window, and
level from left to right and from front to rear according to
installation instructions provided.
Check fans to ensure they are correctly positioned, cen-
tered in orifice, and tight on shaft.
2

LEAKS — Check any connections that show evidence of oil
or leaks. When unit is properly installed, centered, and lev-
eled (see Owners’ Guide), check gaskets and wing panels
for possible air leakage.
CONTROLS — Check unit to ensure all controls are func-
tioning correctly and unit operation is normal.
Vibrations can cause unwanted noise. Check to be sure no
piping is vibrating against any side of unit.
System Cleaning/Flushing — For proper cleaning
and flushing, use the Carrier Totalclaim recovery system, or
a comparable refrigerant recycling system.
Table 2 — Physical and Electrical Data — 1993-1995 Model Offerings
SERVICE/
DISCRETE
NO. CASING
(See Table 6) V-PH-Hz VOLTAGE RANGE COOLING
CAPACITY*
(Btuh)
R-22
CHARGE
(OZ. ± .05) WET BULB
DtF AMPS WATTS EER (DOE)
115-1-60
73TCA005101B S-1 115 104-127 5100 10.00 7.5 5.7 630 8.1
73TCA005111B S-1 115 104-127 5100 13.00 7.5 5.7 630 8.1
73TCA005121B S-1 115 104-127 5000 13.70 7.5 5.4 593 8.0
73TCA005131B S-1 115 104-127 5000 13.70 7.5 5.4 593 8.0
73TCA005141B S-1 115 104-127 5000 10.20 7.5 5.9 630 8.0
73TCA005151B S-1 115 104-127 5000 10.20 7.5 5.9 630 8.0
73TCA005171B S-1 115 104-127 5000 9.20 7.5 5.9 625 8.0
73TCA005101D S-1 115 104-127 5400 11.25 12.0 5.4 593 9.1
73TCA005101L S-1 115 104-127 5100 10.00 7.5 5.7 630 8.1
73TCA005111L S-1 115 104-127 5000 10.20 7.5 5.9 630 8.0
73TCA005121L S-1 115 104-127 5000 9.20 7.5 5.9 625 8.0
73TCA006101D S-1 115 104-127 6000 12.50 11.6 6.5 691 8.6
73TCA006111D S-1 115 104-127 6000 13.50 13.0 6.7 697 8.6
73TCA006121D S-1 115 104-127 6000 13.50 13.0 6.7 697 8.6
73TCA008101D S-2 115 104-127 8000 21.50 12.1 7.5 870 9.2
73TCA008101P S-2 115 104-127 8600 22.25 12.2 7.5 862 10.0
73TCA010101D S-2 115 104-127 9900 24.00 15.5 9.4 1092 9.0
SERVICE/
DISCRETE
NO. PF
(%) CAPACITOR (See Table 5) FAN MTR
CARRIER
P/N FAN MTR
FLA COMPRESSOR (See Table 7) THERMISTOR (See Table 4) CAPILLARY
DATA
(See Table 3)
73TCA005101B 96 RC-1/FC-1 HC01CE118 0.74 D-1 Z-1 CD-1
73TCA005111B 96 RC-1/FC-1 HC01CE118 0.74 D-2 Z-1 CD-2
73TCA005121B 96 RC-2/FC-1 HC01CE118 0.74 M-1 Z-1 CD-3
73TCA005131B 96 RC-2/FC-1 HC01CE117 0.70 M-1 Z-1 CD-3
73TCA005141B 96 RC-1/FC-1 HC01CE118 0.74 D-3 Z-1 CD-4
73TCA005151B 96 RC-2/FC-1 HC01CE118 0.74 D-3 Z-1 CD-4
73TCA005171B 96 RC-2/FC-1 HC01CE118 0.74 D-3 Z-1 CD-4
73TCA005101D 91 RC-2/FC-1 HC01CE117 0.74 M-1 Z-1 CD-5
73TCA005101L 96 RC-1/FC-1 HC01CE118 0.74 D-1 Z-1 CD-1
73TCA005111L 96 RC-2/FC-1 HC01CE118 0.74 D-3 Z-1 CD-4
73TCA005121L 96 RC-2/FC-1 HC01CE118 0.74 D-3 Z-1 CD-4
73TCA006101D 92 RC-2/FC-1 HC01CE117 0.74 M-2 Z-1 CD-6
73TCA006111D 91 RC-2/FC-1 HC01CE118 0.70 D-4 Z-1 CD-7
73TCA006121D 91 RC-2/FC-1 HC01CE118 0.70 D-4 Z-1 CD-7
73TCA008101D 99 RC-3 HC43CE115 1.25 T-1 Z-1 CD-8
73TCA008101P 99 RC-4 HC33CE116 1.60 T-1 Z-1 CD-9
73TCA010101D 98 RC-4 HC33CE116 1.60 T-2 Z-1 CD-10
LEGEND
AHAM — Association of Home Appliance Manufacturers
ANSI — American National Standards Institute
DOE — Department of Energy
EER — Energy Efficiency Ratio
FLA — Full Load Amps
PF — Power Factor
Dt — Entering wet-bulb temperature minus leaving wet-bulb tem-
perature based on 67 F room wet-bulb temperature and 95 F
dry-bulb outside-air temperature. If conditions vary, wet-bulb Dt
will vary.
*Based on AHAM Standard RAC-1 and ANSI Z234.1.
3

Table 3 — Capillary Data
KEY NUMBER
(See Table 2) DIMENSIONS (in.) LENGTH DIMENSIONS (in.) ID NO. OF CAPILLARIES
CD-1 24.0 0.042 1
CD-2 13.5 0.042 1
CD-3 40.0 0.036 2
44.0 0.036
CD-4 20.0 0.042 1
CD-5 36.0 0.036 2
40.0 0.036
CD-6 26.0 0.036 2
32.0 0.036
CD-7 36.0 0.036 2
48.7 0.036
CD-8 30.3 0.042 2
27.3 0.042
CD-9 18.5 0.036 2
24.0 0.036
CD-10 16.0 0.036 318.0 0.036
40.0 0.036
Table 4 — Thermistor
KEY NO.
(See Table 2) CARRIER P/N RESISTANCE (Ohms)
Z-1 HC95XX006 25
Table 5 — Capacitors
KEY NO.
(See Table 2) CARRIER P/N MFD VOLTS
FC-1 HC91PD005 5 250
RC-1 HC91EA025 25 370
RC-2 HC91EA035 35 370
RC-3 HC93CA027 25 370
RC-4 HC93CA028 25 370
LEGEND
MFD — Microfarad
Table 6 — Casing Dimensions (in.)
KEY NO.
(See Table 2) HEIGHT WIDTH DEPTH
S-1 14 19 11
S-2 15
1
⁄ 2 22 14
1
⁄ 2
Table 7 — Compressors
KEY NO.
(See Table 2) REPLACEMENT PART NO. VOLTS
(Single-Phase,
60 Hz) LRA FLA
D-1 P033-0604 115 37.0 6.22
D-2 P033-0605 115 37.0 6.22
D-3 P033-0601HE 115 37.0 6.22
D-4 P033-0606 115 33.0 5.50
M-1 P034-0502 115 34.0 4.80
M-2 P034-0602 115 40.0 5.70
T-1 P031-0802 115 39.2 6.60
T-2 P031-1004 115 48.3 8.60
LEGEND
FLA — Full Load Amps
LRA — Locked Rotor Amps
Table 8 — Receptacles, Fuse Types, Wire Sizes
UNIT NAMEPLATE VOLTAGE 115
MAXIMUM NAMEPLATE
AMPS 12 16
OUTLET RATED VOLTS/
AMPS 125/15 125/20
RECEPTACLE
CONFIGURATION
MFR PART NO.
Hubbell 5261 5361
P&S 6201 5361
GE GE5261-1 GE4102-1
Arrow-Hart 5261 5361
TIME-DELAY FUSE OR CIRCUIT
BREAKER SIZE (AMPS) 15 20*
FUSE TYPE Plug
RECOMMENDED AWG
WIRE SIZE† 14 12
AWG — American Wire Gage
*May be used for 15-amp applications if fused for 15-amp.
†Based on copper wire at 60 C temperature rating.
4

DISASSEMBLY INFORMATION
Before working on any air conditioner, be sure to first
disconnect all electric power to unit to avoid the pos-
sibility of electrical shock and personal injury.
IMPORTANT: It is not necessary to totally disas-
semble all sections of this air conditioner for every ser-
vicing operation. Some of the disassembly steps may
be necessary for your particular need. Disassemble as
needed.
Filter Removal
1. Grasp molded top edge of filter and pull filter straight up
and out of unit. See Fig. 2.
2. Vacuum filter, or wash filter in lukewarm water. Remove
excess water and let filter dry before replacing.
3. Replace filter by sliding filter straight down into filter slot.
Front Grille Removal
1. Ensure unit carry-handle is fully extended. This will avoid
obstruction when removing front grille (applies to
SiestatI 005 and 006 units only).
2. Grasp front grille with both hands at lower sides of front
grille. See Fig. 3.
3. Pull front grille straight toward you.
4. Tilt front grille slightly upward, lifting front grille off unit.
5. To replace front grille, carry handle must be fully ex-
tended (applies to Siesta I 005 and 006 units only).
6. Place front grille onto unit top edge, rotate front grille
downward and firmly push bottom of front grille into
position.
Discharge Air Deck Removal
1. Remove 2 control knobs by pulling knobs straight up. (Set
knobs aside for later replacement.)
2. Locate single screw in temperature (thermostat) knob
cavity.
3. Remove screw and set aside for later assembly.
4. Carefully lift discharge air deck upward and slide deck to
the left. See Fig. 4.
5. Replace discharge air deck by reversing the above
procedure.
Accessing Control Box Components
1. Remove screw (located between evaporator coil and con-
trol box) holding control box.
NOTE: If unit is 008P unit, proceed to step no. 2. If unit
is not 008P unit, proceed to step no. 3.
2. Carefully unsnap exhaust door lever plastic retainer and
put aside for assembly. See Fig. 5.
3. Swing control box to right to gain access to components.
See Fig. 6.
4. Lift 2 control box sheet metal hooks from retaining slots
to complete removal. See Fig. 6.
5. Replace control box by reversing above procedure.
TEMPERATURE
MODE
MED
COOL LOW
COOL
FAN
ON
4
214
12
10
COOLER
OPEN
ENERGY
SAVER
6
8
OFF
PULL GRILLE
TOWARD YOU,
THEN UPWARD
Fig. 3 — Removing Front Grille
SCREWS
LIFT DECK, SLIDE IT TO LEFT
Fig. 4 — Air Discharge Deck Removal
TEMPERATURE
MODE
6
HIGH
COOL
MED
COOL
LOW
COOL
FAN
ON
4
214
12
10
COOLER
OPEN
ENERGY
SAVER
EXHAUST
OFF
8
PULL FILTER STRAIGHT UP
Fig. 2 — Removing Filter
5

Capacitor Removal
1. Before disconnecting, discharge capacitor by shorting ca-
pacitor across terminals.
2. Remove screw fastening capacitor strap to control box.
See Fig. 6.
3. Carefully disconnect wires from capacitor terminals.
Label wires to aid in reassembly.
4. Reverse above procedure for reassembly.
ThermostatRemoval — Indoor thermostat is a vapor-
filled device. The 008Punit employs a thermostat bulb heater.
Use care not to bend or kink the thermostat sensing bulb or
capillary.
1. Remove 2 screws securing thermostat to control box. See
Fig. 4.
NOTE: If unit is 008P unit, proceed to step no. 2. If unit
is 008P unit, proceed to step no. 3.
2. Remove metal clip which connects bulb heater to ther-
mostat sensing bulb. See Fig. 7.
3. Carefully disconnect wires from thermostat terminals.
Label wires to aid in reassembly.
4. Reverse above procedure for reassembly.
Thermostat Bulb Heater Removal (008P Unit
Only) — Use care not to damage sensing bulb or capillary
of thermostats when handling bulb heater. See Fig. 7.
1. Carefully disconnect bulb heater wires from terminals in-
side the control box. Label wires to aid in reassembly.
2. Carefully remove metal clip which connects bulb heater
to thermostat sensing bulb. See Fig. 7.
3. Carefully remove bulb heater wires from braided sleeve.
See Fig. 7.
4. Reverse above procedure for reassembly.
Mode Selector Switch Removal
1. Remove 2 screws holding selector switch to the control
box. See Fig. 8.
2. Carefully disconnect wires from switch terminals. Label
wires to aid in reassembly.
3. Reverse above procedure for reassembly.
Fan Cycle Switch (Energy Saver Switch)
Removal (008P Unit Only)
1. Disconnect wires from switch. Label wire to aid in
reassembly.
2. Remove 2 screws securing fan cycle switch and remove
switch. See Fig. 8.
3. Reverse above procedure for reassembly.
Wing Panel(s) Removal
NOTE: When wing panel(s) are being removed, the upper
and lower frame parts will separate slightly from the curtain.
Hold the upper and lower frame parts securely in place while
performing steps no. 1 and 2. See Fig. 8.
1. Pull wing panel open to its fully opening width. Wing
panel frame will be completely out of unit tracks. See
Fig. 8.
2. Carefully bend panel back slightly, and gently slide panel
upward and off unit side. See Fig. 8.
3. To replace wing panel, compress curtain in frame. Insert
ends of top and bottom frame parts as far as possible into
unit side. See Fig. 9.
RETAINER EXHAUST LEVER
Fig. 5 — Removing Exhaust Door Retainer
SWING CONTROL BOX
GENTLY TO RIGHT TO
GAIN ACCESS
CAPACITOR
CAPACITOR
STRAP
CONTROL BOX
HOOK (2)
RETAINING
SLOTS
Fig. 6 — Accessing Control Box
TEMPERATURE
MODE
6
HIGH
COOL
MED
COOL LOW
COOL
FAN
ON
4
214
12
10
COOLER
OPEN
ENERGY
SAVER
EXHAUST
THERMOSTAT
BULB HEATER
METAL CLIP CONNECTS
BULB HEATER TO
THERMOSTAT
SENSING BULB
BRAIDED
SLEEVE
Fig. 7 — Removing Thermostat
6

4. When curtain frame will not slide inward any further, use
hand to bump frame inward toward unit. The force of your
hand will secure the curtain in position against the side of
the unit. See Fig. 9.
AccessingCompressor,FanMotor,Outdoor Coil
Sections
1. Remove 3 screws on each side of unit (save screws). See
Fig. 10.
2. Remove top rear cover. See Fig. 10.
3. Remove unit rear outdoor grille.
4. Remove ground screw in control box section. See
Fig. 11.
5. Remove compressor terminal cover. See Fig. 11.
6. Disconnect 3 compressor wire quick-connects. Label wires
to aid in reassembly.
7. Carefully bend evaporator coil assembly tubing outward
and away from indoor blower wheel to allow for removal
of air-handling system. See Fig. 12 for major sections
separated.
8. Carefully remove air-handling system by gently pulling
straight up. See Fig. 13.
9. Reverse above procedure to replace components after
servicing.
Exhaust Feature (008P Unit Only) — See Fig. 5
and 14 for any servicing and/or adjustment pictorial
description.
Fan Motor Removal
OUTDOOR FAN
1. Remove center nut securing outdoor fan to fan motor shaft.
See Fig. 14.
2. Remove outdoor fan.
3. Disconnect outdoor fan motor wiring. Label wires to aid
in reassembly.
4. Remove 3 screws securing fan motor to unit partition.
See Fig. 14.
5. Remove fan motor.
INDOOR BLOWER WHEEL
1. Remove clip securing blower wheel to fan motor shaft.
See Fig. 12.
2. Reverse above procedures to replace components.
SLIDE PANEL FRAME
OUT OF UNIT TRACKS,
THEN LIFT UPWARD
FAN CYCLE
SCREWS (2)
FAN CYCLE
SWITCH
(008P MODEL ONLY)
SELECTOR
SWITCH
SCREWS (2)
Fig. 8 — Removing Wing Panel
EXERT SLIGHT
FORCE TO
SECURE PANEL
FRAME
WING PANEL
CURTAIN
COMPRESSED
IN FRAME
Fig. 9 — Replacing Wing Panel
CAUTION
ATTENTION
FILE LR3342
Carrier
Corporation
Syracuse, New York
USE AMP
TIME DELAYFUSE
OR
CIRCUIT BREAKER
DESIGN PLUG
HI 350 LG 150
VOLTRANGE
VOLTS
PH
MODEL/CATALOG
SERVICE
DATEOF MFG.
SERIAL
DISCRETE
HZ
R-22-OZ.
STU/NR
AMPS
WATTS/INPUT
EER
MADEIN MEXICO
MOTORCOMPRESSOR THERMALLY PROTECTED
LISTED
ROOMAIR
CONDITIONERGL16
S1TH500152
REAR
SCREWS (6)
TOP REAR
COVER
Fig. 10 — Removing Rear Cover
7

COMPRESSOR
TERMINAL COVER
GROUND
SCREW GROUND
WIRE
Fig. 11 — Accessing Compressor
BLOWER
WHEEL CLIP
INDOOR
BLOWER WHEEL
EVAPORATOR
COILASSEMBLY
Fig. 12 — Accessing Air-Handling System
Fig. 13 — Removing Air Handling System
FAN MOTOR
SECURING SCREWS (3)
FAN MOTOR
EXHAUST DOOR
LINKAGE
EXHAUST
DOOR
OUTDOOR FAN
CENTER NUT
OUTDOOR
FAN
Fig. 14 — Fan Motor Removal
8

SERVICE POINTS
(Check Annually)
1. Clean indoor and outdoor coils.
Indoor Coil — Use a hooked wire or bristle brush to
remove dirt from fins.
Outdoor Coil — Use compressed air or a vacuum cleaner.
2. Clean basepan and other painted surfaces.
3. Clean all drain passages.
4. Clean motor and fans.
5. Vacuum clean the insulation.
6. Paint parts that show evidence of rust with a good rust-
resistance paint.
7. Check refrigerant connections for evidence of leakage.
Repair if necessary.
8. Check wires for deterioration.
9. Fans should be tight on motor shaft.
10. Run the unit and eliminate any piping vibration.
11. Check thermostat capillaries for proximity to refriger-
ant tubing (should not be touching). Check to be sure
protective sleeve is in place.
9

TROUBLESHOOTING
SYMPTOM AND
PROBABLE CAUSE PROBABLE REMEDY
COMPRESSOR DOES NOT RUN
Opening in Power Circuit
1. Control off 1. Reset control button.
2. Blown fuse 2. Replace fuse.
3. Defective wiring 3. Replace wiring.
4. Defective service cord 4. Replace service cord.
5. Loose electrical connections 5. Tighten connections.
6. Faulty switches, thermostat, or fan 6. Replace defective component.
Compressor Power Supply Open
1. Loose leads at compressor terminals 1. Tighten leads.
2. Defective motor overload switch 2. Replace switch.
3. Defective capacitor 3. Replace capacitor.
4. Open compressor windings 4. Replace compressor.
5. Seized compressor 5. Replace compressor.
COMPRESSOR RUNS BUT CYCLES
Fan Operating Erratically
1. Loose lead at fan motor 1. Tighten lead.
2. Defective or burned out motor 2. Repair or replace motor.
3. Outdoor air restricted or recirculating 3. Check for dirty filter, proper clearances around unit —
remove any obstructions.
4. Overcharge or noncondensables in system 4. Reclaim refrigerant, evacuate and recharge system according to
nameplate specifications.
5. Restricted discharge line 5. Check for obstruction in line; replace tubing if required.
6. Defective motor overload switch 6. Replace switch.
7. Outdoor thermostat capillary touching suction tube 7. Move thermostat capillary away from suction tube.
8. Outdoor coil freezing up due to low temperature
(outdoor thermostat may be set too low) 8. Set outdoor thermostat higher.
Cycles on Compressor Overload
1. Defective run capacitor 1. Replace capacitor.
2. Defective compressor bearings or valves 2. Replace compressor.
3. Greatly restricted indoor air (iced indoor coil) 3. Defrost indoor coil
4. Low refrigerant charge 4. Add charge according to approved method.
5. Indoor capilliary restricted 5. Replace capillary.
6. Liquid line restricted 6. Replace strainer.
7. Compressor hot 7. Verify refrigerant charge.
8. Weak or inconsistent line power 8. Check line voltage at time of compressor start-up.
INSUFFICIENT COOLING
Cooling Air Not Adequate
1. Dirty filter or coil 1. Clean as required.
2. Iced indoor coil (slightly low refrigerant charge) 2. Recharge.
3. Defective fan motor 3. Replace fan motor.
Condenser Air Not Adequate
1. Outside air restricted 1. Check for obstructions and dirty filter. Remedy as required.
2. Dirty coil 2. Clean coil.
3. Defective fan motor 3. Replace fan motor.
Unit Undersized Re-evaluate unit for proper capacity.
Capilliary Restricted Replace capillary.
Compressor Flooding
1. Unit overcharged 1. Reclaim refrigerant, evacuate and recharge system according to
nameplate specifications.
2. Defective electrical connections 2. Check connections per wiring diagrams.
10

Copyright 1996 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 8a 10a PC 131 Catalog No. 537-327 Printed in U.S.A. Form 73TC-1SS Pg 12 1-96 Replaces: New