18
Applicable extension pipe for each model
(1) 1:1 system
(a) Pipe length
(b) Adjusting the amount of refrigerant
• Additional refrigerant charge is not necessary for the pipe length up to 30 m. When the pipe length exceeds 30 m or service
(refrigerant replacement) is performed, charge proper amount of refrigerant for each pipe length referring to table below.
Use refrigerant R410A. Use charge hose exclusive for R410A.
• When charging additional refrigerant, charge the refrigerant from low-pressure side of the port valve using a safety charger.
• Make sure that air purge for this unit at refrigerant replacement is performed from both high-pressure check valve and ser-
vice port. (If air purge is performed only from one of them, air in not purged enough.)
• When replacing refrigerant, charge the refrigerant from service port. When charged refrigerant is less than specified amount,
charge the refrigerant again from low pressure side of the port valve using a safety charger.
• Tighten the service port cap (nut) of stop valve firmly. The tightening torque is 12 to 16 N·m. (For the prevention of slow-leak)
• Check additional refrigerant charging amount referring to table 4 when liquid pipe is one size larger than standard diameter,
and table 2 when the pipe is standard diameter.
<Table 4> Additional refrigerant charging amount for liquid pipe which is one size larger than
standard diameter
[
12.7
[
12.7
RP3
RP4
—
RP6
Liquid pipe dia Chargeless
30m
50m
100 g addition per 1 m when pipe length exceeds 20 m
100 g addition per 1 m when pipe length exceeds 20 m
20m
20m
Max. pipe length Additional refrigerant charging amount
15
30m or
above
31 — 40m
0.6Kg
0.6kg
10m or below
41 — 50m
1.2Kg
1.2kg
51 — 60m
—
1.8kg
61 — 75m
—
2.4kg
<Table 2> Additional refrigerant charging amount for pipe of standard diameter
<Table 3>
Outdoor unit
Permitted
pipe length
Additional refrigerant charging amount for pipe
length exceeding 30 m (kg)
PUHZ-RP3V
PUHZ-RP4V — RP6V
Outdoor unit
PUHZ-RP3V
PUHZ-RP4V — RP6V
Number of
bends
Height
difference
50m or below
75m or below
Permitted
pipe length
50m or below
75m or below
3.1
5.1
11 — 20m 21 — 30m
3.3
5.3
3.5
5.5
31 — 40m
4.1
0.6
6.1
0.6
4.7
1.2
6.7
1.2
—
—
7.3
1.8
—
—
7.9
2.4
41 — 50m 51 — 60m 61 — 75m
Additional refrigerant charging amount for recharging (above) and pipe length exceeding 30m (below) (kg)
Liquid
pipe
(mm)
Gas
pipe
(mm)
[
6.35
[
9.52
[
12.7
[
9.52
OD
Thick-
ness
OD
Thick-
ness
RP3
RP4
RP5
RP6
t0.8
t0.8
[
12.7
t0.8
[
15.88
t1.0
[
12.7
t0.8
[
15.88
t1.0
[
19.05
t1.0
[
15.88
t1.0
[
19.05
t1.0
t0.8
t0.8
: Normal piping
: It can be used, however, additional refrigerant charge is required when the pipe length exceeds 20m. Refer to table 4.
: It cannot be used.
: It can be used.
: It can be used, however, the capacity is lowered. Refer to (C) Capacity correction.
<Table 1> Pipe length for 1:1 system
*1: Set DIP SW8-1 on outdoor unit controller board to ON.
*2: The maximum length is 50 m in case of using existing pipes.
*3: The height difference between indoor and outdoor unit should be kept within 30 m for all models.
[Marks in the table above]
10m
30m
30m
50m
50m
50m
10m
50m (
*1
)
75m (
*2
)
50m
75m (
*2
)
75m (
*2
)
50m (
*1
)
50m (
*1
)
50m (
*1
)
50m (
*1
)
50m (
*1
)
OC294--1.qxp 03.6.9 7:36 PM Page 18
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