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 unit
Outdoor unit
Flare nut
Stopper
Cap
Valve stem
Charge port
Valve body
b
a
e
d
c
L4
L3
L2
L5
L1
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)
