17
Service Information
NOTE
Process valves are not to be left on the tubing in
any application, except the valve on EMA Service
drier part # 5303918288.
5. Close hand shut-off valve to vacuum pump.
Watch compound gauge for several minutes.
If reading rises, there is a leak in the system,
go to step 6. If no leak is indicated, stop
vacuum pump. System is now ready for
charging.
6. If a leak is indicated, stop vacuum pump and
introduce a small charge of refrigerant into
system by cracking valve on bottom of
charging cylinder until system is pressurized
to 40 or 50 lbs psig.
7. Leak test low-side. Close compound gauge.
Run compressor for a few minutes and leak
test high-side. When leak is found, recapture
refrigerant using EPA approved recovery
system Repair and go back to step 1.
CAUTION
Check the serial plate for the correct
refrigerant type. It is extremely important to
verify the type of refrigerant in the system
before starting any sealed system repairs.
After charging the system with liquid be
certain to wait at least 5 minutes before
starting the compressor to give the refrigerant
a chance to disperse throughout the system.
Otherwise the compressor could be damaged
by attempting to pump excessive quantities
of liquid.
Preparing The Charging Cylinder:
1. Make certain that hand shut-off valve to
vacuum pump is closed.
2. Close high-side manifold gauge valve.
3. Set charging cylinder scale to pressure
indicated on cylinder pressure gauge.
4. Observe refrigerant level in sight glass.
Subtract amount to be charged into system
and note shut off point.
5. Open charging cylinder valve slowly and
allow proper charge to enter system.
6. As soon as refrigerant in sight glass has
gone down to predetermined level, close
charging cylinder valve.
7. Allow system to sit for five minutes.
8. Turn on refrigerator compressor. Run
compressor for a few minutes and monitor
system pressures.
9. When satisfied that the unit is operating
correctly, clamp the high-side process tube
with the pinch-off tool while the unit is still
running.
10. Slowly open the high-side manifold gauge
valve to allow the compressor to remove any
refrigerant trapped in the high-side hose and
the process fitting.
11. Close both of the manifold gauge valves. If
the high-side gauge reading rises, the pinch-
off must be corrected before proceeding.
12. Remove the high-side process tube adaptor
and solder the process tube closed.
13. Clamp the low-side process tube with the
pinch-off tool while the unit is running.
Remove the low-side process tube adaptor
and solder the process tube closed.
14. Check the process tubes for refrigerant leaks.
WARNING
Disconnect the charging cylinder heater at
this time to prevent the cylinder pressure from
exceeding its maximum limits.
Final Leak Test
1. With the refrigerator turned OFF leak test all
low-side system components.
2. Turn the unit ON and run until the condenser
is warm. Leak test the high-side system
components.
Charging The System
