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10.6 Evacuation of the Equipment
WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND
PIPES in the following procedure.
1 Connect a charging hose with a push pin to
the Low side of a charging set and the service
port of the gas side 3-way valve.
2 Connect the micron gauge between vacuum
pump and service port of outdoor units.
3 Turn on the power switch of the vacuum pump
and make sure that connect digital micron
gauge and to pull down to a value of
500 microns.
4 To make sure micron gauge a value
500 microns and close the low side valve of
the charging set and turn off the vacuum
pump.
5 Disconnect the vacuum pump house from the
service port of the 3-way valve.
6 Tighten the service port caps of gas side
3-way valve at a torque of 13.3 Ibf•ft (18 N•m)
with a torque wrench.
7 Remove the valve caps of both of the 2-way
valve and 3-way valve. Position both of the
valves to “Open” using a hexagonal wrench
(5/32" (4 mm)).
8 Mount valve caps onto the 2-way valve and
3-way valve.
o
Be sure to check for gas leakage.
O
u
tdoor
u
nit
Liq
u
id side
Gas
side
Vac
uu
m
p
u
mp
Liq
u
id side 3-way valve
Gas side 3-way valve
Liq
u
id side
Gas
side
T
ub
e connector
T
ub
e connector
T
ub
e connector
T
ub
e connector
Close
Close
Indoor Unit
Indoor Unit
If micron gauge value does not descend 500 microns, take the following measures:
- If the leak stops when the piping connections are tightened further, continue working from step
3
.
- If the leak does not stop when the connections are retightened, repair location of leak.
- Do not release refrigerant during piping work for installation and reinstallation.
- Take care when handling the liquid refrigerant, it may cause frostbite.
