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VI. SERVICE PROCEDURES & ADJUSTMENTS (cont’d)
WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE
NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.
VI. d - EVACUATING SYSTEM/GUIDELINES (cont’d):
1) Access the refrigeration system as outlined under
“SYSTEM ACCESS.”
2) Connect low (blue) side of gauge manifold to
schrader valve on compressor process line and high
(red) side of gauge manifold to schrader valve on
filter/drier process line.
3) Connect center line of gauge manifold to vacuum
pump.
4) Turn vacuum pump on and open both sides of gauge
manifold.
5) Pull a vacuum to 200 microns.
6) Break the vacuum with 3 psig of dry nitrogen.
7) Repeat steps 5 and 6.
8) Pull vacuum to 200 microns.
9) Charge system and check for proper operation.
VI. e - CHARGING SYSTEM:
WARNING: DISCONNECT THE ELECTRICAL POWER
TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE
A TAG ON THE CIRCUIT BOX INDICATING THE
CIRCUIT IS BEING SERVICED.
WARNING: THIS PROCEDURE REQUIRES THE USE OF
REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND
GLOVES SHALL BE WORN SINCE REFRIGERANTS
MAY CAUSE BURNS TO THE SKIN.
1) Access the refrigeration system.
2) Attach gauge manifold set to system, low side to
process tube on the compressor and the high side to
the process tube on the drier.
NOTE: See “SYSTEM ACCESS.”
3) Be sure the system is properly leak checked and
evacuated before charging as outlined under “LEAK
CHECK” and “EVACUATING SYSTEM.”
4) Make certain both valves are closed on the gauge
manifold. Open the valve on the bottle. Bleed
charging hose at the manifold gauge to remove air.
NOTE: Initially charge system through high side to
prevent liquid refrigerant from reaching compressor.
5) Open the high side gauge valve (red). Allow
refrigerant to flow into the system until the nameplate
charge is reached or until the high side will not accept
any more refrigerant. At this point, shut the gauge
and bottle valves.
6) Reconnect power to the unit and check for proper
operation and high pressure leaks.
VI. e - CHARGING SYSTEM (cont’d):
7) Add the remaining amount of refrigeration charge
through the low side with the compressor running.
8) Check for proper operation and leaks.
9) Disconnect power to the unit and replace any
covers removed.
VI. f - SYSTEM CLEAN UP/INTRODUCTION:
When a compressor burn-out or moisture infiltration
is encountered, the service person must make the
determination as to the degree of system contamina-
tion. Normally a compressor burn-out will fit into one
of three catagories:
• CONTAINED - compressor oil not acidic, no oil dis
coloration.
• CONTAMINATED COMPRESSOR - oil acidic,
discoloration of oil, contamination limited to
compressor.
• MASSIVE CONTAMINATION - contaminated oil
and/or refrigerant pumped through system.
CONTAINED
1) Replacement of liquid line drier.
2) Install suction filter drier for clean up and then
remove it when service is complete. Usually within
48-hours.
3) Replacement of compressor.
4) Evacuation (to 200 microns).
5) Charge by weight.
CONTAMINATED COMPRESSOR
The “contaminated compressor” requires the same
procedure as the “contained” burn-out. Plus, the
system must be flushed with nitrogen after the
compressor and drier has been removed.