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—12—
2.3.7 MOTOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the evaporator. (Refer to section 2.2.1)
3. Remove the orifice. (Refer to section 2.2.1)
4. Remove the blower. (Refer to section 2.2.1)
5. Remove the fan. (Refer to section 2.2.2)
6. Remove the control box cover and disconnect 5 or
2. Remove the evaporator. (Refer to section 2.2.1)
3. Remove the orifice. (Refer to section 2.2.1)
4. Remove the blower. (Refer to section 2.2.1)
5. Remove the fan. (Refer to section 2.2.2)
6. Remove the control box cover and disconnect 5 or
4 wires of motor housing. (Refer to section 2.1.3)
7. Remove the 4 screws which fasten the motor from
the mount motor. (See Figure 15)
8. Remove the motor.
9. Re-install the components by referring to the
9. Re-install the components by referring to the
removal procedure, above.(See Figure 15)
2.3.8 REVERSING VALVE ASSY
(HEATING MODEL)
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the reversing coil from the reversing valve
2. Remove the reversing coil from the reversing valve
assembly by loosening the screw.
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
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.
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the reversing
vlave assembly connections.
vlave assembly connections.
5. Re-install the components by referring to the
removal procedure, above.
Notes:
When connect the reversing valve assembly,
braze the reversing valve and inter-connecting
tube immersing in water not to make the tempera-
ture of surface exceed more than 120°C(248°F)
braze the reversing valve and inter-connecting
tube immersing in water not to make the tempera-
ture of surface exceed more than 120°C(248°F)
Reversing valve
Reversing coil
Figure 15
Figure 16
2.4 REFRIGERATING CYCLE
2.4.1 CONDENSER
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the 4 screws which fasten the
2. Remove the 4 screws which fasten the
brace.(Refer to section 2.2.1)
3. Remove the 5 screws which fasten the condenser
and shroud.
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the condenser
connections.
connections.
5. Remove the condenser.
6. Re-install the component by referring to notes.
6. Re-install the component by referring to notes.
(See Figure 17)
2.4.2 EVAPORATOR
1. Remove the cabinet. (Refer to section 2.1.2)
2. Remove the 2 screws which fasten the evaporator.
3. Move the evaporator sideways carefully.
2. Remove the 2 screws which fasten the evaporator.
3. Move the evaporator sideways carefully.
(Refer to section 2.2.1)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the evaporator
connections.
connections.
5. Remove the evaporator.
6. Re-install the component by referring to notes.
6. Re-install the component by referring to notes.
(See Figure 18)
2.4.3 CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2.1.2)
2. After discharging the refrigerant completely,
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.(See caution above)
tube.(See caution above)
3. Remove the capillary tube.
4. Re-install the component by referring to notes.
4. Re-install the component by referring to notes.
—13—
Figure 18
Figure 17
Discharge the refrigerant system using a
Freon
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
system, install one (such as a WATCO A-1)
before venting the Freon
TM
. Leave the valve in
place after servicing the system.
CAUTION
—14—
— Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
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
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 unbraze the pinch-off
tubes.
tubes.
3. Solder service valves into the pinch-off tube ports,
leaving the valves open.
4. Solder the pinch-off tubes with Service valves.
5. Evacuate as follows.
5. Evacuate as follows.
1) Connect the vacuum pump, as illustrated figure
19A.
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
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
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 figure
19B.
Open valve C.
Discharge the line at the manifold connection.
19B.
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 cannot be put
in the High-side, the balance will be put in the
suction line through the access valve which you
installed as the system was opened.
in the High-side, the balance will be put in the
suction line through the access valve which you
installed as the system was opened.
2) Connect the charging cylinder as shown in figure
19B.
With valve C open, discharge the hose at the
manifold connection.
With valve C open, discharge the hose at the
manifold connection.
3) Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
4) If more charge is required, the high-side will 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-
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
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 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.
and 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.
NOTES
If high vacuum equipment is used, just crack
valves A and B for a few minutes, then open
slowly with the two full turns counterclockwise.
This will keep oil from foaming and being
drawn into the vacuum pump.
valves A and B for a few minutes, then open
slowly with the two full turns counterclockwise.
This will keep oil from foaming and being
drawn into the vacuum pump.
CAUTION
—15—
Equipment needed: Vacuum pump, 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.
of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service valve.
A
COMPOUND GAUGE
EVAPORATOR
(LOW PRESSURE SIDE)
(LOW PRESSURE SIDE)
COMPRESSOR
CAPILLARY TUBE
CONDENSER
(HIGH PRESSURE SIDE)
(HIGH PRESSURE SIDE)
SEE INSETS
BELOW
MANIFOLD
GAUGE
B
A
B
COMPOUND GAUGE
EVAPORATOR
(LOW PRESSURE SIDE)
(LOW PRESSURE SIDE)
SEE INSETS
BELOW
BELOW
CONDENSER
(HIGH PRESSURE SIDE)
(HIGH PRESSURE SIDE)
MANIFOLD
GAUGE
COMPRESSOR
CAPILLARY TUBE
A
B
EXTERNAL
VACUUM PUMP
VACUUM PUMP
A
CHARGING
CYLINDER
CYLINDER
LOW HI
B
C
Figure 19A-Pulling
Vacuum
Vacuum
(Cooling Model)
(Heating Model)
Figure 19B-Charging
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