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2.4.3 CAPILLARY TUBE
3. Remove the capillary tube.
1. Remove the cabinet. (Refer to section 2.1.2)
4. Re-install the component by referring to notes.
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.(See caution above)
NOTES
— Replacement of the refrigeration cycle.
1. When replacing the refrigeration cycle, be sure to
6. Recharge as follows :
Discharge the refrigerant system using a Ғгеоптм
1) Refrigeration cycle systems are charged from
recovery System.
the High-side. If the total charge cannot be put
If there is no valve to attach the recovery system,
in the High-side, the balance will be put in the
install one (such as a WATCO А-1) before venting
suction line through the access valve which you
the Ргеоптм. Leave the valve in place after
installed as the system was opened.
servicing the system.
2) Connect the charging cylinder as shown in figure
2. After discharging the unit completely, remove the
18B.
desired component, and unbraze the pinch-off
With valve C open, discharge the hose at the
tubes.
manifold connection.
3. Solder service valves into the pinch-off tube ports,
3) Open valve A and allow the proper charge to
leaving the valves open.
enter the system. Valve B is still closed.
4. Solder the pinch-off tubes with Service valves.
4) If more charge is required, the high-side will not
5. Evacuate as follows.
take it. Close valve A.
1) Connect the vacuum pump, as illustrated figure
5) With the unit running, open valve B and add the
18A.
balance of the charge.
2) Start the vacuum pump, slowly open manifold
a. Do not add the liquid refrigerant to the Low-
valves A and B with two full turns
side.
counterclockwise and leave the valves open.
b. Watch the Low-side gauge; allow pressure to
The vacuum pump is now pulling through valves
rise to 30 Ibs.
A and B up to valve C by means of the manifold
c. Turn off valve B and allow pressure to drop.
and entire system.
d. Repeat steps b. and с. until the balance of the
charge is in the system.
6) When satisfied the unit is operating correctly,
If high vacuum equipment is used, just crack
use the pinch-off tool with the unit still running
valves A and B for a few minutes, then open
and clamp on to the pinch-off tube. Using a tube
slowly with the two full tums counterclockwise.
cutter, cut the pinch-off tube about 2 inches from
This will keep oil from foaming and being
il-f
drawn into the vacuum pump.
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 figure
18B.
Open valve C.
Discharge the line at the manifold connection.
5) The system is now ready for final charging.
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