Recalibration
Each gauge is individually tested and calibrated prior to shipment. Due
to its sensitivity, the gauge may need to be “zeroed in” prior to usage.
Adjusting Gauge Recalibration to Zero
1. For 2-1/2": remove lens; for 3-1/8": remove lens plug
2. Turn recal screw slightly in the opposite direction that pointer is
to be moved. Maximum recal screw adjustments is half turn. Over
adjustment will permanently destroy calibration.
3. Replace lens/lens plug
Gauges are sensitive instruments—over adjustment and/or being subjected to pressures
over dial range are not covered under warranty terms.
Evacuation/Charging
CAUTION: Always consult
manufacturer service manual
or instruction sheet for
recommended procedures
MANIFOLD COMPRESSOR
A B C D E F
LOW SIDE HIGH SIDE
EVACUATION
PORT
CHARGING
PORT
DISCHARGE
SERVICE VALVE
SUCTION
SERVICE VALVE
BLUE RED BLACK YELLOW RED BLUE
To observe operating pressures
Closed Closed
Closed Closed
Back seated and
cracked open
Back seated and
cracked open
To charge refrigerant through
suction valves
Open Closed
Closed Open
Back seated and
cracked open
Front seated
To charge oil through suction
valve
Open Closed
Open Closed Back seated
Front seated
To charge liquid refrigerant
through discharge valve
Closed Open
Closed Open
Midway open —
To build low pressure; for
control setting or leak detecting
Open Open
Closed Closed
Back seated and
cracked open
Midway open
To purge refrigerant from
discharge valve
Closed Open
Closed Open
Back seated and
cracked open
—
To evacuate with auxiliary
vacuum pump
Open Open
Open Closed
Midway open Midway open
A
C
D
B
F
E
EVAPORATOR
CONDENSER
RECEIVER
COMPRESSOR
PUMP
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