EN
15
L
With vacuum pump still running close the low
pressure knob on valve manifold. Then stop vacuum
pump. Using an hexagonal key, open the service
valve on small tube, then close it after 10 seconds.
Check tightness of all joints using liquid soap.
Turn the service valves stem in counterclockwise
to fully open the valves. At this point vacuum pump
flexible hose can be disconnected. Replace bonnet
and flare nut, tighten them to 200 kg/cm with a
torque wrench.
Repeat what described from K to L for the second,
third and fourth circuit. The indoor units have to
be marked as “indoor unit circuit A, B, C and D”.
Be sure that the idraulic connection to indoor unit
circuit A, B, C or D corresponds to its own electrical
connection.
Wide tube service
valve (3-way)
Action
Narrow tube service
valve (2-way)
Shipping
Operating and test running the air
conditioner
Measuring pressure and gas charging
Air purging with a vacuum pump
The service port on the wide tube service valve uses a Schrader core
valve to access the refrigerant system. Therefore, be sure to use a hose
connector which has a push-pin inside.
CLOSED
CLOSED
OPEN
OPEN
O-ring
Valve cap
Stem
11 - BASIC FUNCTIONS OF THE SERVICE VALVES
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