r=*"n
Heating and Air Conditioning
N
.07:01
EVACUATING - DEHYDRATING AND CHARGING SYSTEM
F*X1
1.
Reconnect white hose to
Dial-a-charge.
2.
Reconnect hoses to compressor — Schrader
valves out.
3. Open low side valve — open high side valves.
Valves on
Oial-a-charge
fully closed.
4.
Switch on vacuum pump.
5. Open main vacuum valve.
Allow vacuum pump to operate till 275 microns
or below are shown on thermister gauge.
Note:
At this point the charging cylinder may be filled
with correct quantity of refrigerant — See
section
N:06:01.
Close the main vacuum valve for 5 minutes. If the
700 micron bulb does not light up the system is not
leaking.
Proceed to charge system.
If the 700 micron light operates but none higher
resume vacuum for a further 5 minutes — retest
vacuum.
If all the lights come on the system is leaking.
Proceed to leak detection Section
N:05:01.
1.
Check that all taps on the refrigerant station
are closed.
2.
Open the "Refrigerant out" tap on the
charging cylinder.
3. Open the high pressure (Red) tap and allow
14
lb. refrigerant to enter system. Close the
high pressure (Red) tap.
Close outlet valve on
D.A.C.
A high volume fan can be placed to blow the air
over the condenser. This will help to keep the
refrigerant in a liquid form and therefore cut down
the charging time.
Disconnect and bridge LP switch at accumulator.
Hand brake on — transmission in neutral.
Run engine at idle speed.
Match D.A.C. shield to pressure gauge.
Open the low pressure (Blue) tap on station. Open
outlet valve on Dial-a-charge slowly.
Allow another 2 lbs. of
R
- 12 to enter system. This
amount gives the total gas charge of 2.5 lbs.
TOTAL
R-12
CHARGE
2.5 lbs.
1130
gms.
When the full charge has entered the system
(noted by charging cylinder sight glass) close the
D.A.C. outlet tap by turning clockwise.
Close blue gauge valve.
Refit Schrader valves as previously stated, remove
the high and low pressure pipes from the core
access valves and screw them onto the storage
bracket.
Remove the valve access core removers and refit
the dust caps to the valve removers and the
Schrader valve.
ps*l
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