Kentatsu KSTT280HFAN1 [12/20] Expelling air
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Kentatsu KSTT280HFAN1 [12/20] Expelling air

Kentatsu KSTT280HFAN1 [12/20] Expelling air
10
Installation Manual
Use refrigerant tank to expel air (see Fig.6-2 and Fig.6-3 )
Screw up the pipe nuts at A, B, C and D completely.
Loosen and remove the square-head cover and the mainte-
nance orifice nut of valves A and B.
Connect the filler hose of the refrigerant tank with the mainte-
nance orifice of valve A.
Loosen the valve of the refrigerant tank, continue filling refriger-
ant for 6 seconds to expel the air, and tighten the nut of valve B
quickly.
Loosen the valve of the refrigerant tank again, and fill the
refrigerant for 6 seconds. Detect leak for all adapters at A, B, C
and D. After making sure that no leak exists, screw off the filler
hose. After all the filled refrigerant is expelled, screw up the
maintenance orifice nut of valve A quickly.
Open the square-head spools of valves A and B completely.
Tighten the square-head cover of valves A and B.
Use a vacuum pump to expel the air (Fig.6-4 ): (For method of
using the manifold valve, see the operation manual of manifold
valve)
Loosen and remove the maintenance orifice nut of valve A, and
connect the filler hose of the manifold valve to the maintenance
orifice of valve A (tighten both valve A and valve B).
Connect the filler hose adapter to the vacuum pump.
Open the low pressure (Lo) handle of the manifold valve
completely.
Start the vacuum pump to extract air. At the beginning of
extracting air, slightly loosen the maintenance orifice nut of valve
B, check whether any air enters it (the vacuum pump noise
changes, and the multimeter indicates from negative to 0). Then
tighten this maintenance orifice nut.
Upon completion of vacuuming, tighten the low pressure (Lo)
handle of the manifold valve completely and stop the vacuum
pump. Keep extracting air for over 15 minutes. Check whether
the multimeter points at -1.0X10 Pa(-76cmHg).
Loosen and remove the square-head cover of valves A and B.
After opening valves A and B completely, tighten the square-
head cover of valves A and B.
Remove the filler hose off the maintenance orifice of valve A, and
then tighten the nut.
Fig.6-4
Manifold valve
-76cmHg
Filler hose
Filler hose
V
a c u u
m p u
m
p
Hi -handle
Lo pressure valve
Multimeter manometer
Lo-handle
From the following table, select a method of expelling air.
If the air conditioner is relocated, be sure to use a vacuum pump
or refrigerant tank to expel air.
Use the refrigerant in the outdoor unit to expel air(see Fig.6-
2and
Fig.6-3)
Screw up the pipe nuts at A, B, C and D completely.
Loosen and remove the square-head cover of valves A and B,
rotate the square-head spool of valve B counterclockwise for 45
degrees and stay for about 10 seconds, and then close the
spool of valve B tightly.
Detect leak for all adapters at A, B, C and D. After making sure
that no leak exists, open the maintenance orifice nut of valve A.
After all air is expelled, tighten the maintenance orifice nut of
valve A.
Open the spools of valves A and B completely.
Tighten the square-head cover of valves A and B completely.
6.4 Expelling Air
Fig.6-2
Fig.6-3
Length of connective pipe
(single pass)
Procedure of expelling air
Less than 5m
5~15m
Use refrigerant in the outdoor unit
Use vacuum pump or refrigerant
tank.
A
B
C
D
Outdoor unit
Intdoor unit
Stop valve
Air side
Liquid side
pipe adapter
Table.6-2

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