GSZH5 Service Manual

96
SERVICING
condensable air and moisture. As an alternative, the Triple
Evacuation Method is detailed in the Service Manual for
this product model.
It is recommended to remove the Schrader Cores from the
service valves using a core-removal tool to expedite the
evacuation procedure.
1. Connect the vacuum pump, micron gauge, and vacuum
rated hoses to both service valves. Evacuation must
use both service valves to eliminate system mechanical
seals.
2. Evacuate the system to 500 microns or less using
suction and liquid service valves. Using both valves is
necessary as some compressors create a mechanical
seal separating the sides of the system.
3. Close pump valve and hold vacuum for 10 minutes.
Typically, pressure will rise during this period. If the
pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to
startup.
4. If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or non-condensable
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered
check for leaks as previously indicated and repair as
necessary then repeat evacuation.
5. If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as
necessary then repeat evacuation.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2 3 4 5 6 7 8 9
10

PRESENT
MINUTES
V
ACUUM
IN
MICRONS
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES

1. Evacuate the system to 4000 microns and hold for 15
minutes. Break the vacuum with dry nitrogen, bring the
system pressure to 2-3 PSIG and hold for 20 minutes.
Release the nitrogen.
2. Evacuate to 1500 microns and hold for 20 minutes.
Break the vacuum with dry nitrogen again, bring the
system pressure back to 2-3 PSIG and hold for 20
minutes.
3. Evacuate the system to 500 microns and hold for 60
minutes.
4. If the pressure rises to 1000 microns or less and
remains steady the system is considered leak free;
proceed to start-up.
LOW SIDE
GAUGE
AND VALVE
HIGH SIDE
GAUGE
AND VALVE
TO
UNIT SERVICE
VALVE PORTS
VACUUM PUMP
VACUUM PUMP
ADAPTER
800 PSI
RATED
HOSES
CHARGING
CYLINDER
AND SCALE
Charging
WARNING

• 
• 


CAUTION




CAUTION



Charge the system with the exact amount of refrigerant.

nameplates for the correct refrigerant charge. An
inaccurately charged system will cause future problems.