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1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the upper air guide. (Refer to section 2.2.1)
3. Remove the blower. (Refer to section 2.2.2)
4. Remove the fan. (Refer to section 2.2.3)
5. Remove the shroud. (Refer to section 2.2.3)
6. Remove the control box. (Refer to section 2.1.3)
7. Remove 2 screws which fasten the motor.
8. Remove the motor.
9. Re-install the components by referring to the

above removal procedure. (See figure 18)

1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant system using a Freon

TM

Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the Freon

TM

. Leave the valve in place after

servicing the system.

3. Remove 4 screws which fasten the condenser.
4. After discharging the refrigerant completely, detach

the interconnecting tube at the condenser
connections.

5. Remove the condenser.
6. Re-install the component by referring to notes.

(See figure 19)

1. Remove the cabinet. (Refer to section 2.1.2)
2. Discharge the refrigerant system using a Freon

TM

Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the Freon

TM

. Leave the valve in place after

servicing the system.

3. Remove the cover E,P.S and the upper air guide

(Refer to section 2.2.1)

4. After discharging the refrigerant completely, detach

the interconnecting tube at the evaporator
connections.

5. Remove the evaporator.
6. Re-install the component by referring to notes.

(See figure 20)

—12—

—13—

— Replacement of the refrigeration cycle.

1. When replacing the refrigeration cycle, discharge

the refrigerant system using a Freon

TM 

Recovery

System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the Freon

TM

. Leave the valve in place after 

servicing the system.

2. After discharging the unit completely, remove the

desired component, and detach the pinch-off
tubes.

3. Solder service valves into the pinch-off tube ports,

leaving the valves open.

4. Solder the pinch-off tubes with care.
5. Evacuate as follows.

1) Connect the vacuum pump, as illustrated Figure

21A.

2) Start the vacuum pump, slowly open manifold 

valves A and B with two full turns
counterclockwise and leave the valves open.
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold

and entire system.

3) Operate the vacuum pump for 20 to 30 minutes, 

until 600 microns of vaccum is obtained. Close 
valves A and B, and observe vacuum gauge for 
a few minutes. A rise in pressure would 
indicate a possible leak or moisture remaining in
the system. With valves A and B closed, stop 

the vacuum pump.

4) Remove the hose from the vacuum pump and

place it on the charging cylinder. See figures
21A and 21B. Open valve C.
Discharge the line at the manifold connection.

5) The system is now ready for final charging.

6. Recharge as follows :

1) Refrigeration cycle systems are charged from the

High-side. If the total charge connot be put 
in the High-side, the balance will be put in the 
suction line through the access valve which you 
install as the system was opened.

2) Connect the charging cylinder as shown in figure 

21B.
With valve C open, discharge the hose at the
manifold connection.

3) Open valve A and allow proper charge to 

enter the system. Valve B is still closed.

4) If more charge is required, the high-side does not 

take it. Close valve A.

5) With the unit running, open valve B and add the 

balance of the charge.
a. Do not add the liquid refrigerant to the Low-

side.

b. Watch the Low-side gauge; allow pressure to 

rise to 30 lbs.

c. Turn off valve B and allow pressure to drop.
d. Repeat steps b and c until the balance of the 

charge is in the system.

6) When satisfied the unit is operating correctly, 

use the pinch-off tool with the unit still running 
and the clamp on to the pinch-off tube. Using a
tube cutter, cut the pinch-off tube about 2 inches
from the pinch-off tool. Use sil-fos solder and
solder pinch-off tube closed. Turn off the unit,
allow it to set for a while, and then test the
leakage of the pinch-off connection.

If high vacuum equipment is used, just crack
valves A and B for a few minutes, then open
slowly with two full turns counterclockwise. This
will keep oil from foaming and being drawn into
the vacuum pump.

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the upper air guide. (Refer to section

2.2.1)

3. Discharge the refrigerant system using a Freon

TM

Recovery System.

If there is no valve to attach the recovery system,

install one (such as a WATCO A-1) before venting
the Freon

TM

. Leave the valve in place after

servicing the system.

4. After discharging the refrigerant completely, detach

the interconnecting tube at the CAPILLARY TUBE.

5. Remove the CAPILLARY TUBE.
6. Re-install the component by referring to notes.

—14—

Equipment needed: Vacuum pump, Freon

TM

Recovery System, Charging cylinder, Manifold gauge, Brazing

equipment. Pin-off tool capable of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove
components, Service valve.

A

B

COMPOUND GAUGE

CONDENSER

(HIGE PRESSURE SIDE)

MANIFOLD
     GAUGE

CAPILLARY TUBE

EVAPORATOR

(LOW PRESSURE SIDE)

COMPRESSOR

SEE INSETS
   BELOW

A

B

EXTERNAL
VACUUM PUMP

A

C

B

LO

HI

CHARGING
CYLINDER

—17—

487mm(19 /  ")

3

16

218mm(8  /  ")

15

26

510mm(20 /  ")

1

16

353mm(13 / ")

7

8

487mm(19 /  ")

3

16

218mm(8  /  ")

15

26

510mm(20 /  ")

1

16

353mm(13 / ")

7

8

OPERATION

COO

L

FA

N

HIGH

HIGH

LOW

LOW

THERMOSTAT

5

4

3

2

1

9

8

7

6

CO

O

LE

R

0

o

CAPILLARY TUBE

COMPRESSOR

BLOWER

EVAPORATOR COIL

:  REFRIGERANT FLOW

CONDENSER COIL

FAN

MOTOR

The following is a brief description of the important components and their function in what is called the refrigeration system.
Reference should made to figure 22 to follow the refrigerating cycle and the flow of the refrigerant in the cooling cycle.

Discharge the refrigerant system using a
Freon

TM

Recovery System. If there is no valve

to attach the recovery system, install one
(such as a WATCO A-1) before venting the
Freon

TM

. Leave the valve in place after

servicing the system. Do not vent Freon

TM

into

the atmosphere.

MOTOR

COMPRESSOR

OIL

(LIQUID REFRIGERANT)

CAPILLARY TUBE 

OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH

SUCTION LINE
COOL LOW PRESSURE VAPOR

COOLED
AIR

COMPLETE LIQUID
BOIL OFF POINT

LIQUID
PRESSURE
DROP

ROOM AIR HEAT LOAD

VAPOR INLET

HOT
DISCHARGED
AIR

LIQUID OUTLET

HIGH PRESSURE VAPOR

LIQUID REFRIGERANT

LOW PRESSURE VAPOR

ROOM AIR CONITIONER

EVAPORATOR COILS

CONDENSER COILS

CYCLE OF REFRIGERATION