Mitsubishi Electric PUHZ-RP3VHA Technical & Service Manual page 18

Applicable extension pipe for each model
(1) 1:1 system
(a) Pipe length
<Table 1> Pipe length for 1:1 system
Liquid
OD
pipe
Thick-
(mm)
ness
Gas
[9.52
OD
pipe
Thick-
t0.8
(mm)
ness
RP3
RP4
RP5
RP6
*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]
: Normal piping
: It can be used, however, additional refrigerant charge is required when the pipe length exceeds 20m.
: It cannot be used.
: It can be used.
: It can be used, however, the capacity is lowered.
(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 2> Additional refrigerant charging amount for pipe of standard diameter
Outdoor unit
PUHZ-RP3V
PUHZ-RP4V — RP6V
<Table 3>
Outdoor unit
PUHZ-RP3V
PUHZ-RP4V — RP6V
<Table 4> Additional refrigerant charging amount for liquid pipe which is one size larger than
standard diameter
Liquid pipe dia Chargeless
[12.7
RP3
—
[12.7
RP4 RP6
[6.35
t0.8
[12.7 [15.88
t0.8 t1.0
10m 10m
Additional refrigerant charging amount for pipe
Permitted
length exceeding 30 m (kg)
pipe length
31 — 40m
50m or below
0.6Kg
75m or below 0.6kg
Additional refrigerant charging amount for recharging (above) and pipe length exceeding 30m (below) (kg)
Permitted
pipe length
10m or below
50m or below 3.1
75m or below 5.1
Max. pipe length Additional refrigerant charging amount
20m 30m
100 g addition per 1 m when pipe length exceeds 20 m
20m 50m 100 g addition per 1 m when pipe length exceeds 20 m
[9.52
t0.8
[12.7 [15.88
t0.8 t1.0
30m 50m
75m (*2)
75m (*2)
75m (*2)
Refer to (C) Capacity correction.
41 — 50m 51 — 60m 61 — 75m
—
1.2Kg
1.2kg 1.8kg 2.4kg
11 — 20m 21 — 30m 31 — 40m
3.3 3.5
5.3 5.5
18
[12.7
[19.05 [15.88
t1.0 t1.0
30m
50m (*1) 50m
50m (*1)
50m
50m (*1)
50m
Refer to table 4.
Number of Height
difference
bends
—
30m or
15
above
41 — 50m 51 — 60m 61 — 75m
4.1 4.7 —
0.6 1.2 —
6.1 6.7 7.3
0.6 1.2 1.8
t0.8
[19.05
t1.0
50m (*1)
50m (*1)
50m (*1)
—
—
7.9
2.4