Basic Function Of The Service Valves; Pump Down - Sanyo PNR-XS2432 Installation Instructions Manual

9-3. Basic Function of the Service Valves

The basic function of the service valves are given in Table 7 below.
Action
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. (Fig. 9-3)

9-4. Pump Down

Pump down means collecting all refrigerant gas in the
system back into the outdoor unit without losing any of
the gas. Pump down is used when the unit is to be
moved or before servicing the refrigerant circuit
Pump Down Procedure
Be sure to carry out pump down with the unit in
cooling mode.
(1) Connect the Lo side charging hose of the manifold
valve to the service port on the wide tube service
valve.
(2) Using a hex wrench, turn the narrow tube service
Narrow Tube Service
Valve (2-Way)
1826_M_I
1828_M_I
1830_M_I
1832_M_I
Hose with push-pin
Wide Tube Service
Valve (3-Way)
O-ring
Valve cap
Stem
1827_M_I
1829_M_I
1831_M_I
1833_M_I
PUSH
Fig. 9-3
valve clockwise all the way to close the service
valve. (Be sure to confirm that the wide tube
service valve is fully open.)
(3) Press the operation button and start cooling
operation.
(4) When the low pressure gauge reading falls to 1 to
2
0.5 kg/cm (14.2 to 7.1 PSI), fully close the wide
tube valve stem with a standard screwdriver. Then
quickly stop the unit.
(5) Disconnect all gauges and hose, and replace the
bonnets and the valve caps as they were before.
27
S4359128
Service valve
1834_M_I