DC Inverter U-match Series Cassette Type Unit
20
4.3.7 Liquid Pipe and Drain Pipe
(1) If the outdoor unit is installed lower than
the indoor unit (See Fig. 4.17).
1) A drain pipe should be above ground and
the end of the pipe does not dip into water.
All pipes must be restrained to the wall by
saddles.
2) Taping pipes must be done from bottom to
top.
3) All pipes are bound together by tape and
restrained to wall by saddles.
Fig. 4.17
(2) If the outdoor unit is installed higher than
the indoor unit (See Fig. 4.18).
1) Taping should be done from lower to the
upper part.
2) All pipes are bound and taped together
and also should be trapped to prevent
water from returning to the room.
3) Restraint all pipes to the wall with saddles.
Fig. 4.18
4.4 Vacuum and Gas Leakage Inspection
!
Do not purge the air with refrigerants but use a vacuum pump to vacuum the
installation! There is no extra refrigerant in the outdoor unit for air purging!
4.4.1 Vacuum
(1) Remove the caps of the liquid valve, gas valve and also the service port.
(2) Connect the hose at the low pressure side of the manifold valve assembly to
the service port of the unit’s gas valve, and meanwhile the gas and liquid
valves should be kept closed in case of refrigerant leak.
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