BARKO LOADERS 295, Service Manual

Page: 62 / 85

page 62
295 AC
800-00158
AIR CONDITIONER MAINTENANCE CONTINUED...
Field Charging Procedure:
1) Insure all fittings are tight and components installed correctly.
2) Attach manifold gauge set to high and low side service ports. The blue coupler attaches to low
pressure charge port and red coupler attaches to high pressure charge port.
3) Attach yellow (center) hose from manifold gauge set to vacuum pump.
4) Attach Thermistor Vacuum Gauge to a/c system not at the vacuum pump. The reading at the
vacuum pump may not give an accurate indication of the true vacuum in the a/c system.
5) Start vacuum pump.
6) Open both red and blue (high and low side) valves on manifold gauge set.
7) Let vacuum pump run until thermistor vacuum gauge reads 1000 microns. Then run an additional
15 minutes.
8) Close red and blue valves on manifold gauge set.
9) Monitor pressure reading on thermistor vacuum gauge for 10 minutes with vacuum pump off and
manifold gauge valves closed. Reading should be between 1000 and 400 microns and should not
climb above 1000 microns.
10) If pressure in a/c system rises above 1000 microns the system has a leak and needs to be
repaired prior to charging system.
11) After verifying the system has no leaks, remove thermistor vacuum gauge. Vacuum gage
may be damage if pressurized above atmospheric pressure.
12) Attach yellow hose from manifold gauge set to refrigerant.
13) Place refrigerant tank upside down on charging scale. (Yellow hose should be attached and tank
valve open.)
14) Zero charging scale measurement.
15) Open red (high side) valve on manifold gauge set and add the factory recommended charge
amount.
Close red valve on manifold gage set. Charging is complete. Verify proper a/c operation.
Document total refrigerant added to system and apply appropriate label near compressor stating
refrigerant charge amount.
16) If the proper refrigerant charge amount is not known, add one to two pounds of liquid refrigerant to
the system through the high side port (red). The amount of refrigerant added depends on the
estimated full charge amount. It is typically ½ to ¾ of the estimated full charge.
Close red valve on
manifold gauge set . This type of refrigerant charging should be done at an ambient temperature of
32°C (90°F) or greater with machine doors open to provide a load on the evaporator.