Charging The System - Case 580SR Service Manual

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3.7

CHARGING THE SYSTEM

IMPORTANT: be sure there are no leaks in the sys-
tem and the system has been fully evacuated. Ob-
serve all safety recommendations when handling
refrigerant HFC 134a, see "Precautions when Han-
dling Refrigerant HFC 134a" in this Section.
1. Ensure the charging unit is correctly connected
to the loader backhoe air conditioning system in
accordance with the manufacturers instructions.
2. If a charging unit, in conjunction with the mani-
fold gauge set is used, open the high and low
side hand valves on the manifold.
3. Charge the system with 0.75 kg of refrigerant as
per the manufacturers instructions.
4. If the charging rate becomes very slow close
the high side valve carefully, start the loader
backhoe and set engine speed to idle. Turn ON
the air conditioning so that the compressor can
Connecting recovery evacuation and recycling/charging station to the loader backhoe
1. Built in manifold gauge set
2. Recovery/recharging unit
SECTION 50 - CAB HEATING AND AIR CONDITIONING
pull the remainder of the refrigerant into the sys-
tem.
5. If the refrigerant charge will not completely
transfer to the air conditioning system, recover
and recharge the system.
6. Close the high and low side valves on the units
control panel, or manifold gauge set if being
used and test the air conditioning as detailed in
Performance testing the air conditioning system
on page 26.
NOTE: after charging a system use the following
start up procedure to ensure the lubricating oil is
properly dispersed around the system.
Z Ensure air conditioning is switched OFF.
Z Start the engine and bring speed down to idle.
Z Turn the air conditioning ON and allow system to
operate for at least one minute before increasing
engine speed.
3. Low side (suction) service valve (blue hose)
4. High side (discharge) service valve (red hose)
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