28
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For details about how to use manifold valves, see the
instruction manual for manifold valves.
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The handle Hi below connect operate during the following
work if it is fully closed.
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Evacuate every indoor unit for rooms A
B
C and D.
Air purge and leak test
In the case of gas leakage
Tighten the flare nut connections.
If this tightening does not help stopping the leakage
repair the leak portion (s).remove the gas from the
service port, refill the specified amount from the
cylinder gas.
WARNING:
When installing or moving the unit, do not mix
anything other than specified refrigerant (R22) into
the refrigerating cycle.
If air is mixed,it may cause the refrigerating cycle to
get abnormally high temperatre, causing a risk of
burst.
Evacuate the circuit for 15 minutes or more,and make sure
that the compound pressure gage reads-760 mm Hg.
After finishing the evacuation.fully close the handle Lo on
the manifold valve. and then stop the vacuum pump.
Fully open the stop valve (2-way and 3-way valves) by
turning the valve rods to the left until they stop When the
rods contact the stoppers. do not apply force any more.
Tighten the valve rod caps for the stop valves (2-way and
3-way valves).
Leak test
Using soapy water. perform the leak test for both the indoor
and outdoor sides,Make sure no bubbles appear on the
connections. If bubbles appear they indicate gas is leaking
from that point.
If gas is leaking
Tighten the flare nut connection more strongly.
If it has no effect.repair any existing leak points,release all
gas from the service port completely,and then recharge the
specified amount of refrigerant gas from cylinder.
Make sure the pipes have been connected properly.
Connect the manifod valve to the service port of the stop
valve (3- way valve) by using a charge hose, At this time,
the inside-core end of the charge hose must be connected
to the service port.
Make sure the stop valve (2-way and 3-way valve) are fully
closed. and then connect another charge hose to a vacuum
pump.
Fully open the handle Lo on the manifold valve, and then
run the vacuum pump.
Loosen the flare nut of the stop valve (3-way valve) slightly
to make sure that air is entering it.
Then, retighten the flare nut.
(If air is not entering it, make sure again the charge hose is
fimly connected to the service port.)
Cap for service port
Cap for stop valve
N.m
13.7 to 17.7
19.6 to 29.4
kgf.cm
140 to 180
200 to 300
Tightening torque
Mite
Pressar gage
Hande Hi
Charge
bose
Hande Lo
Comperad powere gage
