Case 580SR, Service Manual

Page: 787 / 1068

SECTION 50 - CAB HEATING AND AIR CONDITIONING 27
Attaching The Gauge Set To The Loader Backhoe
1. Low side gauge
2. High side gauge
3. Shut-off Valve
4. Test Hose to High Side Service Connector
5. Centre Hose (Not Used)
6. Test Hose to Low Side Service Connector
7. Shut-off Valve
8. Low Pressure (Suction) Side Service Valve
9. High Pressure (Discharge) Side Service Valve
Performance Testing The Air Conditioning Sys-
tem
The manifold gauge set is the most important tool
used in testing and servicing the air conditioning
system.
NOTE: for Dealers who posses the latest design
level of refrigerant recovery, recycling and recharg-
ing station, these gauges are an integral part of the
machine.
The following instructions for performance testing
the air conditioning system is based on the use of
the gauge set shown. The principal of operation is
however similar when testing the system using a re-
covery and recharging station with integral gauges.
When using this type of equipment
always consult
the manufacturers operating instructions.
Operating Precautions
IMPORTANT: always ensure the shut-off valves are
closed (turn clockwise until seated) during all test
operations.
In the closed position, refrigerant circulates around
the valve stems to the gauges. Therefore, when the
manifold gauge set is connected into a system,
pressure is registered on both gauges.
Z
NEVER open the HIGH SIDE shut off valve when
the system is operating.
Z
ALWAYS open the LOW SIDE shut off valve when
adding refrigerant.
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