Mitsubishi Electric PKA-RP1.6GAL Service Technical Manual page 19

4-3. Applicable extension pipe for each model
4-3-1. 1:1 system
(a) Pipe length
<Table 1> Pipe length for 1:1 system
Liquid
OD
pipe
Thick-
(mm)
ness
Gas
OD [9.52
pipe
Thick-
t0.8
(mm)
ness
RP1.6 30m
10m
RP2
RP2.5
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
Permitted
Outdoor unit
pipe length
50m or less
PUHZ-RP1.6, 2V
50m or less
PUHZ-RP2.5, 3V
PUHZ-RP4 - 6V, RP4 - 6V
75m or less
1
<Table 3>
Permitted
Outdoor unit
pipe length
PUHZ-RP1.6, 2V 50m or less
PUHZ-RP2.5, 3V
50m or less
PUHZ-RP4-6V 75m or less
PUHZ-RP4-6V 75m or less
1
<Table 4> Additional refrigerant charging amount for liquid pipe which is one size larger than standard diameter
Liquid pipe dia Chargeless
RP1.6, 2 [9.52
RP2.5, 3 [12.7
RP4-6 [12.7
[6.35
t0.8
[12.7 [15.88
t0.8 t1.0
50m 30m
50m 30m
10m 10m
10m 10m
Refer to (c) Capacity correction.
Additional refrigerant charging amount for pipe
length exceeding 30 m (kg)
31 — 40m 41 — 50m
0.2kg 0.4kg
0.6Kg 1.2Kg
0.6kg 1.2kg
Additional refrigerant charging amount for recharging (above) and pipe length exceeding 30m (below) (kg)
11 — 20m 21 — 30m
10m or below
2.1 2.3
3.1 3.3
5.1 5.3
4.6 4.8
Max. pipe length Additional refrigerant charging amount
20m 30m
60 g addition per 1 m when pipe length exceeds 20 m
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 [19.05
t0.8 t1.0 t1.0
30m (*1)
30m
30m 30m (*1)
30m 50m
30m 50m
75m (*2) 50m (*1)
75m (*2) 50m (*1)
75m (*2) 50m (*1)
Number of
bends
51 — 60m 61 — 75m
— —
— —
15
1.8kg 2.4kg
31 — 40m 41 — 50m 51 — 60m 61 — 75m
2.7 2.9
2.5
0.2 0.4
4.1 4.7
3.5
0.6 1.2
6.1 6.7
5.5
0.6 1.2
5.6 6.2
5.0
0.6 1.2
19
[12.7
t0.8
[15.88 [19.05
t1.0 t1.0
30m
30m
50m 50m (*1)
50m (*1)
50m
50m (*1)
50m
Refer to <table 4>.
Height
difference
30m or
above
— —
— —
— —
— —
7.3 7.9
1.8 2.4
6.8 7.4
1.8 2.4