Carrier 73Y User Manual

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Page 1

73X,Y

HEATING & COOLING

Start-Up and Service Instructions

CONTENTS

Page

START-UP.................................................................1

SERVICE ...................................................................1,2

General Notes Compressor Replacement

SAFETY REMINDERS PREVENTIVE MAINTENANCE

General .......................................................................2

System Cleaning/Flushing.......................................2

DISASSEMBLY INFORMATION .......................... 5 12

Filter Removal ...........................................................5

Front Grille Removal

Control Box Removal.............................................. 5

Thermostat Bulb Heater Removal

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

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

Exhaust Door Removal

Vent Door Removal

(Models 73YCA213P and 73YCA243P

Only)....................................................................... 9

Indoor Blower Wheel Removal

Outdoor Propeller Fan Removal............................ 10

Fan Motor Removal

Compressor Removal ............................................ 11

Strainer Removal and Replacement Electric Heater Assembly Removal

SERVICE POINTS ................................................... 13

TROUBLESHOOTING ..............................................14

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1 2

2-4

9 9

10 11 11

1993 Room Air Conditioners

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

Page 2

Compressor Replacement — Stand dear of com

pressor terminals when working on compressors. With sys

tem under pressure, terminals may blow. Observe the same .safety procedures for rotary compressors as for reciprocat ing 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.

Recover the refrigerant charge from the unit. After re

4. 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 location is easily accessible when making the final joints.

You can braze the oil piping stub into the new com

pressor fittings more easily before the compressor is

put back into the unit.

A CAUTION

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 tapa-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 to Compressor Removal, page 11.

7. Remove tap-a-llnes from suction and discharge lines Carefully braze the holes closed from where the tap-alines were removed.

8. Clean system: add or replace liquid line filter drier. For proper cleaning and flushing, use the Carrier Totalclaim® reclaim system or a comparable refrig

erant recycling system.

9. Install new compressor and braze into place with fieldsupplied 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.

SAFETY REMINDERS

1. Carry a fire extinguisher in your truck. Keep it within reach when using a torch. Check fire extinguisher peri odically 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.

PREVENTIVE MAINTENANCE

General

CLEANING — Clean cooling coil and condenser coil. Hold

flashlight behind coil to see If all spaces are clear. Use a

hooked wire to remove dirt. Dust accumulation obstructs 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. 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.

tered in orifice, and tight on shaft. LEAKS — Check any connections that show evidence of

oil or leaks. When unit is properly installed, centered, and leveled (see Owners’ Guide), check gaskets and wing pan els for possible air leakage.

CONTROLS — Check unit to ensure all controls are func tioning correctly and unit operation is normal.

no piping is vibrating against any side of unit.

System Cleaning/Flushing — For proper cleaning and flushing, use the Carrier Totalclaim reclaim system, or a comparable refrigerant recycling system.

Do not use carbon tetrachloride, solvents, or waxes

Check fans to ensure they are correctly positioned, cen

Vibrations can cause unwanted noise. Check to be sure

Page 3

Table 1 — Physical and Electrical Data (Single Phase, 60 Hz) — 1993

MODEL

XHA101D XCA121D XCA123D XHA123D XCA153D XHA153D XHA173D XCA183D YCA213D YCA213P YCA243D YCA243P

MODEL

XHA101D

CASING

(See

Table 6)

305 9,100 305 12,000 305 305 12,000/11,600 9,200/ 7,600 305 15,000/14,700 305 305 305 17,800/17,500 405 405 21,000/20,800 405 405 23,500/23,000

CAPACITOR

(See Table 5)

CAPACITY (Btuh)*

Cooling

Heating

5,200

— 37 5

12,000/11,600

15,000/14,700 17,100/16,700

14,600/11,800 38 16,300/12,900 38

21,000/20,800

—

23,500/23,000

FAN MOTOR

Carrier

Part Number

RC-1 25901023 1 88

FLA

XCA121D RC-1 25901023 1.88 XCA123D XHA123D RC-1 XCA153D XHA153D XHA173D XCA183D YCA213D RC-2 YCA213P YCA243D YCA243P

RC-1 25901026 0.98

25901026 0 98 RC-1 25901031 0 99 RC-1 RC-2 25901018 RC-2 25901018

RC-2 RC-3 25901024 1.54 T-1 RC-3

25901031

25901024 1.54 D-2 z-1

25901024 1.54

25901024 1 54 T-1 z-1

0 99 D-1

1.24 D-3 z-1 V4 CD-3

1.24 D-3 z-1

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

R-22

WET

CHG

BULB

(oz.

± .05)

29 5

AtF

103

Volts

10.0 115 125 230/208

37 5

12.5 230/208

37.5 230/208

24 1

230/208 253-187 6 5/70 20.9/19 0 1470/1440 4790/3950 10 2/10.2 98/99

97 97 230/208

24.6 230/208

21.8 230/208

24.1 230/208

51 51 24.1 230/208

COMPRESSOR

(See Table 2)

H-1 Z-1

H-2 H-3 z-1 - CD-6 CI-1 2 H-3 z-1 V2 D-1 z-1

D-2

Voltage

Range

127-104

115

127-104 253-187 253-187 5 2/ 5.5 253-187

253-187 253-187 8.2/ 8 9 253-187 253-187 253-187 253-187

THERMISTOR

NAMEPLATE

Amps

Cool Heat

9.0

16 1 1020

105

5 2/55

13.4/12 3

6 5/ 7.0

Watts

Cool Heat

1200

1180/1140

1840

EER

(DOE)PF(%)

9.0 98

10.0 99

10 2/10.2 98/99 1180/1140 3080/2540 10.2/10 2 98/99 1470/1440

10 2/10.2 97/99

7 9/ 8.5 22 7/20.8 1800/1750 5220/4320 9 5/ 9.5 99/98

- 1870/1840 - 9.5/ 9 5 99/99

10 4/11.3 - 2290/2260 - 9 2/ 9.2

10.4/11.3

- 2290/2260 -

12.0/12.7 - 2670/2610 - 8 8/ 8.8 12 0/12.7

HEATER

(See Table 4)

Z-1 - CD-6 CI-1 2

z-1

z-1 z-1

ASSEMBLY

(See Table 3)

2670/2610

CAPILLARY

(See Tables 7 and 8)

Data Insertion

CD-4 CI-1 1

CD-6 CI-1 CD-I CD-I

CD-3 CD-2 CI-1 3 CD-2 CD-5 CD-5

CI-1 CI-1 3 CI-1 CI-1

CI-1 CI-1 3 CI-1

9 2/92

8 8/88

96/96 96/96 97/99 97/99

Number

of Tubes

2 3

3 3

•Based on AHAM Standard RAC-1 and ANSI Z234 1 At — Entering wet-bulb temperature minus leaving wet-bulb temperature

based on 67 F room wet-bulb temperature and 95 F dry-bulb outside-air temperature If conditions vary, wet-bulb At will vary

KEY NUMBER

(See Table 1)

D-1

D-2 P033-2221 23.0 230/208 50 0 9.1 D-3 P033-1821

H-1 P031-1004

H-2 P031-1103 H-3

T-1 P035-2522

LEGEND

LRA — Locked Rotor Amps FLA — Full Load Amps

Table 2 — Compressors

REPLACEMENT

PART NUMBER

P033-1521 13.0

P031-1122

OIL RECHARGE

(oz.)

VOLTS

(1 Ph, 60 Hz)

LRA FLA

230/208 33 2

13.0

9.1 9 1

9.1

230/208 38 0 74

115 48 3 115 54 0 160

230/208 26.3

183 230/208 63.0 107

8.6

4.8

Page 4

Table 3 — Heater Assemblies

Table 6 — Casing Dimensions (in)

HEATER

ASSEMBLY

(See Table 1)

VI V2 V3 V4

LS — Limit Switch

KEY NUMBER

(See Table 1)

Z-1

KEY NUMBER

(See Table 1)

RC-1 RC-2 RC-3

PRIMARY

KILOWATTS

1.6 140 200

2.8

4.5 140 200

5.0

(F)

140 200

140 210

SECONDARY

Table 4 — Thermistor

CARRIER VENDOR

NUMBER NUMBER (Ohms)

42320001

CM305C20C

RESISTANCE

Table 5 — Capacitor

CARRIER

NUMBER

05706028 05706030 30/5

05706031 45/5

MFD

25/5

(F)

VOLTS

370

KEY NUMBER

(See Table 1)

305 16% 25% 6 23%4 405 17% 6 26 27% 6

HEIGHT WIDTH DEPTH

Table 7 — Capillary Data

(See Table 1)

CD-I

CD-2

CD-3 CD-4 1 Tube - 28 7 CD-5 CD-6

Length (± .002) ID (± .002)

1 Tube — 47.0 1 Tube - .054 2 Tubes — 64 0 2 Tubes — 054 2 Tubes — 29.3

1 Tube - 56 3

1 Tube — 47.0 2 Tubes — 29.3 2 Tubes — 054

1 Tube - 39.5 2 Tubes — 29.3 2 Tubes — 40 5

2 Tubes — .054 2 Tubes — .054

Table 8 — Capillary Insertion

DEPTH (In.)

(See Table 1)

CI-1 1 1

Condenser Coll

Connection Tube

Evaporator Coil

Connection Tube

2 Tubes — 054

1 Tube - .064 1 Tube - .054

1 Tube — .064 1 Tube — .054

DEPTH (in.)

Table 9 — Receptacles, Fuse Types, Wire Sizes

UNIT NAMEPLATE VOLTAGE 115 MAXIMUM NAMEPLATE AMPS OUTLET RATED VOLTS/AMPS

RECEPTACLE CONFIGURATION

125/15

MFR PART NO.

Hubbell P & S GE

Arrow-Hart

TIME-DELAY FUSE OR CIRCUIT

BREAKER SIZE (AMPS) FUSE TYPE

RECOMMENDED AWG

WIRE SIZEt

AWG — American Wire Gage

‘May be used for 15-amp applications if fused for 15-amp.

tBased on copper wire at 60 C temperature rating.

5261 6201

GE5261-1

5261

14 12

125/20

5361 5361

GE4102-1

5361

20*

250/15

5661 5661

GE4069-1

5661

230/208

250/20

5461 5871

GE4182-1

5861

20*

Cartridge

250/30

9330 5930

GE4139-3

5700

Page 5

DISASSEMBLY INFORMATION

A WARNING

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.

Models 73X,Y Room Air Conditioners have the follow

ing characteristics;

_________

UNIT

73XC Cooling Only 73XH 73YC Cooling Only

FUNCTION

Heat/Cool

CASING

305 305 405

All units have a slide-out chassis. Units can be serviced

without removing casing.

Filter Removal

Place index fingers inside the openings on either side of

1. the filter frame. See Fig. 1.

Apply pressure inward toward the center, while pulling filter down and out.

Vacuum filter, or wash in lukewarm water. Shake off

3. excess water and dry thoroughly.

Replace filter by sliding filter upward behind front grille

4. until filter snaps in place.

SCREW (HIDDEN) SCREW (SECURITY)

Fig. 2 - Removing 2 Screws from Front Grille

Fig. 3 - Removing Front Grille

Control Box Removal

1. Slide chassis part way out of casing to access control box.

A CAUTION

Use care when sliding chassis out of unit so that it does not fall from casing. Personal injury and/or damage to unit and surroundings can result.

Fig. 1 — Removing Filter

Front Grille Removal

1. Remove 2 screws located on either side of front grille. See Fig. 2.

NOTE; Facing the front of unit, grille screw on the righthand side serves as a unit security screw.

2. Pull grille out and upward, removing it from chassis. See Fig. 3.

3. To replace grille, place grille top on unit top edge and

firmly press grille back into position.

4. Replace screws.

NOTE; Sliding chassis partly out of casing ensures that the wiring does not become pinched when the control box is replaced. See Fig. 4.

Remove front grille. Refer to Front Grille Removal on this page.

Carefully remove thermostat and mode switch control

3. knobs by pulling them straight out and off. See Fig. 5.

Grasp escutcheon located in lower right-hand corner of unit and apply pressure on both sides towards the cen ter. See Fig. 6. Carefully disengage ¿scutcheon plastic tabs from sheet metal slots and remdve.

Remove 2 screws securing control box to chassis. See Fig. 7.

Disengage plastic clip, then ybmove sensing bulb with attached bulb heater from coil face. See Fig. 7.

Page 6

7. Carefully pull control box straight out from unit.

8. On right side and bottom of control box, manually dis engage removable sheet metal panel to access control

box components. See Fig. 8. See Fig. 9 for control box components.

9. Reverse above procedure for reassembly, taking care

not to pinch any wiring inside the control box. This is accomplished by guiding the wiring from the rear of the control as shown in Fig. 4.

Fig. 4 — Removing Control Box

SENSING

BULB

METAL CLIP

BULB HEATER

Fig. 7

BRAIDED SLEEVE

SCREWS (2)

Removing Screws Securing Control Box

to Chassis

Fig. 5 — Removing Knobs

Fig. 6 — Removing Escutcheon

GRASP PANEL

LIFT PANEL

TO REMOVE

Fig. 8 - Removing Sheet Metal Panel

Page 7

Thermostat Bulb Heater Removal — Use care not to damage sensing bulb or capillary of thermostat when handling bulb heater. See Fig. 7.

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Carefully disconnect bulb heater wires from terminals Inside control box. Label wires to aid in reassembly.

3. Remove plastic clip used to hold thermostat sensing bulb, bulb heater, and braided sleeve to coil. (See Fig. 7.)

4. Carefully remove metal clip which connects bulb heater to sensing bulb.

5. Carefully remove bulb heater wires from braided sleeve (Fig. 7).

6. Reverse above procedure for reassembly.

Mode Switch Control Removal (See Fig. 9 and

10)

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Remove 2 screws holding mode switch control to con trol box. See Fig. 11.

3. Carefully disconnect wires from mode switch control. Label wires to aid in reassembly.

4. Reverse above procedure for reassembly.

Capacitor Removal

1. Discharge capacitor before removing.

2. Slide out control box. Refer to Control Box Removal instructions, page 5.

3. Remove screw fastening capacitor strap to control box and remove strap. (See Fig. 9, 10 and 12.)

4. Carefully disconnect wires from capacitor terminals. Label wires to aid in reassembly.

5. Reverse above procedure for reassembly.

MODE SELECT SWITCH

CAPACITOR Í \

AIR SWEEP MOTOR

(MODELS 73YCA213P, 243P ONLY)

CAPACITOR STRAP

THERMOSTAT

MODE SELECT SWITCH

TIMER ASSEMBLY (MODELS 73YCA213P, 243P ONLY)

INDICATOR LIGHT WIRES (MODELS 73YCA213P AND 243P ONLY)

Fig. 9 — Control Box Components

Timer Assembly Removal (Models 73YCA213P

and 73YCA243P Only)

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Carefully disconnect wires from timer assembly (Fig. 9). Label wires to aid in reassembly

3. Remove 2 screws securing timer to control box and re move timer from rear of control box.

4. Reverse procedure for reassembly.

Fig. 10 - Components Layout

BRAIDED SLEEVE (PROTECTS

THERMOSTAT SCREWS

SCREWS TO REMOVE MODE SELECT SWITCH

SENSOR BULB AND BULB HEATER)

Fig. 11 — Removing Thermostat and Bulb Heater

CAPACITOR STRAP SCREW

Fig. 12 — Removing Capacitor Strap Screw

Page 8

Indicator Light Removal (Models 73YCA213P and 73YCA243P Only)

Slide out control box. Refer to Control Box Removal

instructions, page 5. Carefully disconnect indicator light wires (Fig. 9 and

13) from termination connections. Label wires to aid in

reassembly.

3. Remove light by pulling straight out through front of control box.

4. Reverse above procedure for reassembly.

Indoor Thermostat Removal — indoor thermostat is a vapor-filled device with an attached bulb heater. Be careful not to bend or kink the thermostat-sensing bulb or capillary. See thermostat location in control box in Fig. 10.

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Remove 2 screws securing thermostat to control. See Fig. 11.

3. Carefully disconnect wires from thermostat terminals. Label wires to aid in reassembly.

4. Remove plastic clip used to hold bulb heater, sensing bulb, and braided sleeve to coil. (See Fig. 7.)

5. Remove metal clip which connects bulb heater to sens ing bulb. (See Fig. 7.)

6. Carefully slide sensing bulb from protective sleeve. It is not necessary to remove the bulb heater from the braided sleeve.

7. Remove thermostat from control box.

8. Reverse above procedure for reassembly.

Fan Cycle Switch (Energy Saver Switch)

Removal

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Disconnect wires from switch. Label wires to aid in reassembly.

3. Remove 2 screws securing fan cycle switch (Fig. 13)

and remove switch.

4. Reverse above procedure for reassembly.

INDICATOR LIGHT (MODELS 73YCA213P

AND 243P ONLY)

AIR SWEEP

SWITCH (MODELS SCREWS FOR AIR SWEEP MOTOR

73YCA213P AND

243P ONLY)

Fig. 13 — Removing Air Sweep Motor

Air Sweep Switch Removal (Models 73YCA213P and 73YCA243P Only)

1. Slide out control box. Refer to Control Box Removal instructions, page 5.

2. Disconnect wires from switch. Label wires to aid in reassembly.

3. Remove 2 screws securing air sweep switch (Fig. 13) and remove switch.

4. Reverse above procedure for reassembly.

Chassis Removal

A CAUTION

Coil fins are sharp. Use care when removing chassis from casing to avoid personal injury. Do not use plas tic parts for lifting or pulling. They are not structural members of the chassis. Lift using basepan only. Chas sis is heavy. Obtain assistance for lifting.

Chassis can be serviced without removing unit casing from

window or wall location.

1. Remove front grille. See Front Grille Removal instruc tions, page 5.

2. Slide chassis out of casing. See Fig. 14.

3. Reverse above procedure to reinstall chassis in casing. Be sure to replace and tighten left-hand screw and righthand security screw on the front grille.

Air Sweep Motor Removal (Models 73YCA213P and 73YCA243P Only)

1. Remove control box. See Control Box Removal instruc tions, page 5.

2. Carefully disconnect air sweep motor (Fig. 9) wire terminations.

3. Carefully pull plastic air sweep motor cam from shaft.

See Fig. 13.

4. Remove 2 screws securing air sweep motor to control box and remove motor.

5. Reverse above procedure for reassembly.

Evaporator and Condenser Coils Removal (See Fig. 15)

NOTE; Coils and interconnecting tubing are copper.

1. Reclaim all refrigerant from system using a Carrier Totalclaim® or Carrier Totalsave recovery system, or a

comparable refrigerant recovery system. Refer to Serv

ice section, page 1.

2. Remove chassis from casing. See Chassis Removal in structions, above.

3. Remove air handling system. See Air Handling System Removal instructions, page 9.

4. Cut interconnecting tubing and remove evaporator coil from basepan by removing 2 evaporator screws. See Fig. 15.

5. Cut interconnecting tubing and remove condenser coil from basepan by removing 2 condenser coil screws. See Fig. 15.

6. Reverse above procedure for reassembly.

Page 9

TOP GUSSET

SCREW SECURING EVAP SCROLL TO EVAP TUBE SHEET

Fig. 14 — Removing Chassis

COMPRESSOR

TERMINAL

COVER

EVAPORATOR COIL

EVAPORATOR SCREW {1 OF 2)

BASEPAN

EVAPORATOR-" POWER PARTITION ORIFICE SCREW SCREW (1 OF 2) CORD SCREWS (2) (1 OF 4)

NOTES: 1 Second condenser coil screw is iocated on the back of unit.

2. Third and fourth condenser orifice screws are iocated in same area on opposite end of condenser orifice

CONDENSER

Fig. 15 — Unit Chassis

Air Handling System Removal

1. Remove chassis from casing. See Chassis Removai in structions, page 8.

2. Remove 2 screws securing partition to basepan as shown in Fig. 15, and one screw on left side (Fig. 16), and one screw on rear side of partition (Fig. 17), in area of

motor.

3. Remove 2 screws securing evaporator scroll to evapo

rator tube sheet. See Fig. 16.

4. Remove 4 screws (2 on right side and 2 on left side) securing condenser orifice to condenser coil tube sheet. See Fig. 15 for location of right-side screws; left-side (2) screws are in similar location on left side.

5. Remove compressor terminal cover. Disconnect wires

from compressor and external overload protector termi

nals. Label wires to aid in reassembly. See Fig. 15. NOTE: Not all models have compressors with external

overload protectors; certain models use compressors with internal overload protectors

6. Remove fan motor clip. See Fig. 17.

LEFT SIDE PARTITION SCREW'

SCREW SECURING EVAP SCROLL TO EVAP TUBE SHEET

Fig. 16 — Preparing to Lift Air Handling System

7. Carefully disengage one of the vertical air deflectors, al lowing access to assist in removing air handling system assembly. See Fig. 18.

8. Carefully lift assembly from chassis. See Fig. 19.

9. Reverse above procedure for reassembly, ensuring air handling system is positioned correctly. Tighten all screws.

Exhaust Door Removal (See Fig. 20)

1. Remove chassis from casing. See Chassis Removal in structions on page 8.

2. Remove air handling system. See Air Handling System Removal Instructions, on this page.

3. Remove control box from chassis. See Control Box Re

moval instructions, page 5.

4. Remove 3 screws securing partition to indoor plastic scroll.

(See Fig. 21.)

5. Carefully separate sheet metal partition slots from scroll tabs on both sides by spreading sheet metal sides apart. Remove scroll from sheet metal partition. (See Fig. 22.) Exhaust door and cable assembly from door to rotary knob (Fig. 20) are now exposed for required repairs or

adjustments.

6. Reverse above procedure for reassembly.

Vent Door Removal (Models 73YCA213P and 73YCA243P Only) (See Fig. 20)

1. Remove chassis from casing. See Chassis Removal in structions, page 8.

2. Remove air handling system. See Air Handling System Removal instructions, on this page.

3. Remove control box from chassis. See Control Box Re moval instructions, page 5.

4. Remove 3 screws securing center partition to indoor plas tic scroll. See Fig. 21.

5. Carefully separate sheet metal partition slots from scroll tabs on both sides by spreading sheet metal sides apart. Remove scroll from sheet metal partition. See Fig. 22. Vent door and cable assembly from door to rotary knob (Fig. 20) are now exposed for repairs or adjustments.

6. Reverse above procedure for reassembly.

Page 10

FAN MOTOR CLIP (SPRING)

FAN MOTOR

PARTITION

ROTARY KNOB

CABLE

VENT DOOR

(73YCA213P

AND 243P ONLY)

AIR HANDLING SYSTEM REMOVAL SCREW LEFT SIDE SCREW TOP

REAR SIDE PARTITION SCREW

Fig. 17 — Removing Fan Motor Clip

Fig. 18 — Disengaging Vertical Air Deflector

EXHAUST DOOR

EXHAUST DOOR SPRING CLIP

Fig. 20 — Indoor Plastic Scroll Assembly

INDOOR PLASTIC

SCROLL (HIDDEN)

SCREWS (2 OUT OF 3)

NOTE: Third screw is located on left side of partition as viewed from front of unit.

SHEET METAL

PARTITION

TYPICAL STRAINER LOCATION

CONDENSR ORIFICE

CONDENSER COIL

Fig. 21 — Screws Securing Partition to indoor

Plastic Scroll Assembly

Fig. 19 — Removing Air Handling System

Indoor Blower Wheel Removal (See Fig. 22)

1. Remove chassis from casing. See Chassis Removal in structions, page 8.

2. Remove air handling system. See Air Handling System Removal instructions, page 9.

3. Mark shaft at a point where wheel hub and motor shaft meet to aid in reassembly.

4. Remove spring metal clip from blower wheel hub. See Fig. 22.

5. Slide off blower wheel from motor shaft.

6. Reverse above procedure for reassembly.

Outdoor Propeller Fan Removal (See Fig. 23)

1. Remove air handling system. See Air Handling System Removal instructions, page 9.

2. Mark shaft at a point where fan hub and motor shaft meet to aid in reassembly.

3. Remove spring metal clip from fan hub. See Fig. 23.

4. Remove fan from motor shaft.

5. Reverse above procedure for reassembly.

Page 11

BLOWER WHEEL

PARTITIONSLOTS

3. Remove indoor blower wheel and outdoor fan. See Indoor Blower Wheel Removal and Outdoor Propeller Fan Removal instructions, page 10.

4. Remove control box. See Control Box Removal instruc

tions, page 5.

5. Carefully disconnect fan motor wiring.

6. Remove 3 screws securing motor to partition. See

Fig. 24.

7. Reverse above procedure for reassembly.

SPRING METAL

CLIP

PARTITION SLOTS

Fig. 22 — Removing Blower Wheei

SPRING METAL CLIP

Fig. 23 — Removing Outdoor Propeiler Fan

Fan Motor Removal (See Fig. 24)

1. Remove chassis from casing. See Chassis Removal in structions, page 8.

2. Remove air handling system. See Air Handling System Removal instructions, page 9.

SCREW

PARTITION

SCREW

Fig. 24 - Removing Fan Motor

Compressor Removal (See Fig. 15)

NOTE: Before removing compressor, refer to Service sec tion, page 1, and Carrier Standard Service Techniques Manual, Chapters 1 and 2.

1. Reclaim all refrigerant from system using a Carrier Totalclaim® or Carrier Totalsave recovery system, or a comparable refrigerant recovery system.

2. Remove chassis from casing. See Chassis Removal in structions, page 8.

3. Remove compressor terminal cover. (See Fig. 15.)

4. Disconnect wires from compressor and external overload protector terminals Label wires to aid in reassembly.

NOTE: Some models may have compressors with inter nal overload protectors.

5. Replace external overload protectors, if needed.

6. Disconnect piping. Refer to Compressor Replacement

section, page 2, being careful to observe all

CAUTIONS.

Strainer Removal and Replacement

NOTE: Two strainers are installed in the interconnecting tubing: one is between the condenser and capillary tube,

and one is between the evaporator and capillary tube. (For

typical location, see Fig 21.)

1. Remove chassis from casing. See Chassis Removal in structions, page 8.

2. Reclaim all refrigerant from system using a Carrier Totalclaim or Carrier Totalsave recovery system, or a comparable system. Refer to Service section, page 1.

3. Cut tubing 1 in. from capillary tube insertion point.

4 Use a thin piece of wire to remove strainer from tubing.

5. Insert new strainer into tubing Reassemble tubing with field-supplied copper coupling.

Electric Heater Assembly Removal

1. Remove chassis from casing. See Chassis Removal in structions, page 8.

2. Remove plastic access cover on top of partition. (See Fig. 25.)

3. Remove heater assembly (Fig. 26) by lifting straight up, taking care not to cause fin damage to top of evaporator coil when heater assembly mounting bracket is lifted off coil.

4. Remove 2 wires from heater assembly (Fig. 25). Mark wires to aid in reassembly

5. Repair or replace limit switches (Fig. 26) as needed.

6. Reverse above procedure for reassembly.

Page 12

MOUNTING BRACKET

PLASTIC

access

COVER

WIRES (2,

'9- 25 Heater Assembly Wires

evaporator

Fig. 26 - rho» ■

H^TERWIRH

9 Chassis »i,h Elactn,! Haatar

Page 13

SERVICE POINTS

(Check Annually)

Clean evaporator and condenser coils.

1. Indoors — Use a hooked wire or bristle brush to re

move dirt from fins. Outdoors — Use compressed air or a vacuum cleaner.

Clean basepan and other painted surfaces. Clean all drain passages.

3. Clean motor and fans.

Vacuum clean the insulation.

5. Paint parts that show evidence of rust with a good rust-

resistant paint.

7. Check refrigerant connections for evidence of leakage. Repair if necessary.

8. Check wires for deterioration.

9. Check damper controls.

10. Fans should be tight on motor shaft.

11. Run the unit and eliminate any piping vibration. 12 Check thermostat capillaries for proximity to refriger

ant tubing (should not be touching). Check to be sure protective sleeve is in place.

Page 14

TROUBLESHOOTING

SYMPTOM AND

PROBABLE CAUSE

COMPRESSOR DOES NOT RUN Opening in Power Circuit

1. Controi off

2. Biown fuse

3. Defective wiring

4. Defective service cord

5. Loose eiectricai connections

6. Faulty switches, thermostat, or fan Compressor Power Supply Open

1. Loose leads at compressor terminals

2. Defective motor overload switch

3. Defective capacitor

4. Open compressor windings

5. Seized compressor COMPRESSOR RUNS BUT CYCLES

Fan Operating Erratically

1. Loose lead at fan motor

2. Defective or burned out motor

3. Outdoor air restricted or recirculating

4. Overcharge or noncondensables in system

5. Restricted discharge line

6. Defective motor overload switch Cycles on Compressor Overload

1. Defective run capacitor

2. Defective compressor bearings or valves

3. Greatly restricted indoor air (iced indoor coil)

4. Low refrigerant charge

5. Indoor capillary restricted

6. Liquid line restricted

7. Compressor hot

8. Weak or inconsistent line power INSUFFICIENT COOLING

Cooling Air Not Adequate

1. Dirty filter or coil

2. Iced indoor coil (slightly low refrigerant charge)

3. Defective fan motor Condenser Air Not Adequate

1. Outside air restricted

2. Dirty coil

3. Defective fan motor Unit Undersized

Air Leakage

Capillary Restricted Compressor Flooding

1. Unit overcharged

2. Low indoor airflow AIR SWEEP NOT WORKING

1. Linkage in upper control box stuck

2. Air sweep motor failure

HEATER CYCLES ON LIMIT SWITCH

1. Dirty filter

2. Blocked indoor air inlet

3. Low airflow due to fan motor speed

PROBABLE REMEDY

1 Reset control button

2. Replace fuse.

3 Replace wiring. 4 Replace service cord

5. Tighten connections.

6. Replace defective component.

1 Tighten leads.

2. Replace switch 3 Replace capacitor 4 Replace compressor

5. Replace compressor

1. Tighten lead

2. Repair or replace motor

3. Check for dirty filter, proper clearances around unit — remove any obstructions

4 Reclaim refrigerant, evacuate and recharge system according to

nameplate specifications.

5. Check for obstruction in line, replace tubing if required.

6 Replace switch.

1 Replace capacitor.

2. Replace compressor

3 Defrost indoor coil. 4 Add charge according to approved method.

5. Replace capillary.

6. Replace strainer

7. Verify refrigerant charge.

8. Check line voltage at time of compressor start-up

1. Clean as required

2. Recharge.

3. Replace fan motor.

1. Check for obstructions and dirty filter. Remedy as required. 2 Clean coil.

3. Replace fan motor. Re-evaluate unit for proper capacity Check caulking around sleeve Repair if necessary.

Replace capillary.

1 Reclaim refrigerant, evacuate and recharge system according to

nameplate specifications.

2 Clean filter and/or evaporator coil

1 Lubricate linkage. Check for proper assembly

2 Replace motor

1 Clean or replace filter 2 Remove blockage. 3 Check fan motor. Repair or replace as necessary.

Page 15

Bookll 14 PC 131 Catalog No 537-320 Printed in U S.A Form 73X,Y-1SS Pg 16 3-94 Replaces: New

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

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