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6.Purging Method:To use vacuum pump
Push the air out of the indoor unit
and piping as followes:
(1) Remove the valve cap on 2-way
valve in outdoor unit.
(2) Loosen by 1/2 turn the flare nut of
gas pipe, which is conneted to
3-way valve.
(3) Loosen 2-way valve by 90
hexagon wrench, and after approx.
10 sec tighten it up. Gas comes out
through flare nut on wide pipe. If no
gas is discharged, tighten flare nut
with specified torque.
(4) Open 2-way and 3-way valves
using specified torque.
(5) Tighten the caps on the valves
with specified torque.
Valve rod
Valve cap
When connecting pipe exceeds 5 meters, 20g refrigerant shall be added
per exceeding meter. Charge according to the following list.
Piping length
Additional amount
Note: When extending piping, air inside piping shall be removed by using external
refrigerant gas, charge according to the following list.
Brand new outdoor unit is charged 50g more refrigerant than regulated weight.
Only for first installation, this extra 50g can be used to purge air in pipes.
During this procedure, 50g refrigerant will be discharged in piping.
(This must be strictly controlled within 90
Outdoor unit
o
using
Tighten torque N.m
7-9
20-25
5m
7m
40g
No need
2-way valve
6.35mm(1/4")
HSU-18CR03(T3)
10m
100g
o
and 10 sec.)
7
3-way valve
12.7mm(1/2")
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