22
Air purging and leakage test
This procedure requires a manifold valve and
a vacuum pump.
1. Make sure the liquid side valve and gas
side valve are set to the closed position
and check pipes are connected properly.
2. Remove service port nut and connect
manifold valve to the service port of the
3-way valve using a charge hose.
3. Connect manifold valve to the vacuum
pump using another charge hose.
4. Fully open handle Lo on the manifold
valve and run the vacuum pump.
5. Loosen the flare nut of the outdoor unit
3-way valve and check that air
penetrates. If air does not penetrate,
check charge hose is firmly connected
to the service port. Tighten the flare nut.
6. Evacuate the circuit for about 15 minutes
with the vacuum pump. Make sure
compound pressure gauge reads minus
760 mm Hg.
7. When evacuation is complete fully close
handle Lo on manifold valve. Then stop
vacuum pump and disconnect it.
8. First open the liquid side valve completely
then 30 seconds after open the gas side
valve fully.
9. Check connections are not leaking using
soapy water or a special leak spray.
Bubbles indicate leak.
Outdoor condensation drainage space
When the unit is heating or defrosting, the
wastewater formed in the outdoor unit can
be removed through the drain hose. If the
wastewater cannot be drained properly
from the base plate, the defrosting will be
incomplete and the heating capacity of the
unit could be reduced significantly.
Installation: install the outdoor drain elbow
on the Ø 25 millimeter hole on the base
plate as shown in Fig. 4, and join the drain
hose to the elbow, so that the wastewater
formed in the outdoor unit can be drained to
the appropriate place.
Fig. 4
