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Purging the system
21
Caution in handling the packed valve integrated in the
outlets of outdoor unit.
1. Operation of opening packed valve: Open the valve stem until it hits against
the stopper. Do not try to open it further.
2. Operation of closing packed valve: Securely tighten the valve stem with a
special tool. Then securely tighten the valve stem cap with a spanner or the
like. Refer to the table on page 17 for valve cap tightening torque.
Note:
There is a charging port integrated in the low side outlet, but not in the
high side outlet. The low side outlet is shown in the sketch map below.
Half union
Refrigerant
A
C
D
B
Packed valve
Gas
Indoor unitOutdoor unit
Flare nut
Stopper
Cap
Valve stem
Charge port
Valve body
ba edc
L4L3L2 L5L1
H1
Outdoor unit
Indoor unit
Lx
5. Pipe length and refrigerant amount for multi split type air conditioner.
(see tabel 2.3)
Air purging
Max height
difference (H2)
(BTU/h)
Cooling capacity
Additional amount of
refrigerant to be charged
Connective pipe
length (Lx)
Max connective pipe
total length (H1)
Use vacuum pump.
Use vacuum pump.
25'~66'
246'
197'
50'
50'
R410a: 0.22ozs/ft (Pipe length-82')
R410a: 0.22ozs/ft (Pipe length-131')
26000
34400
25'~82'
Table 2.3
(x=1, 2, 3)
(x=1, 2, 3, 4, 5)
(H1=L1+L2+...+Lx, x≤5)
(H1=L1+L2+...+Lx, x≤3)
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