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—10—
— Replacement of the refrigerant.
1. When replacing the refrigerant, be sure to
Discharge the refrigerant system using a Freon
TM
recovery System.
If there is no valve to attach the recovery system
to, 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.
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.
1) Connect the vacuum pump, as illustrated figure
18A, on page 11.
2) Start the vacuum pump and 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 figure
18B, on page 11.
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.
2) Connect the charging cylinder as shown in figure
18B, on page 11.
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 must remain 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-
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 that 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" from the top of 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, adjust valves
A and B so they are opened only slightly 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.
2.4.3 CAPILLARY TUBE
1. Remove the cabinet. (Refer to section 2.1.2)
2. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube. (see caution on previous page)
3. Remove the capillary tube.
4. Re-install the components by referring to notes on
page 11.
CAUTION