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 or for 3-1/8”: remove lens plug
2. Turn recalibration screw
slightly
in the opposite direction that
pointer is to be moved. Maximum recalibration screw adjustment
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
