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TROUBLESHOOTING
35) Technical Data When Replacing the Refrigerant System Parts
NOTE) Refer to the followings when you replace the refrigerant system parts.
Flare nuts tightening torque
Additional refilling amount of the refrigerant oil when repairing the refrigerant system
※1. When replacing the parts that do not contain the refrigerant oil inside such as discharge pipes, expansion
valves, or dryer filters
※2. When the compressor (including dryer filter) is replaced. (You must supply refrigerant oil into the compressor
unit separately. For details, refer to Refer to P116, [Replacing the Compressor])
※3. If the other parts are replaced together, total of refilling amount required for each replaced part must be added.
Standard amount of refrigerant
Additional refilling amount of the refrigerant when repairing the refrigerant system
(Calcuate using the formula indicated below)
NOTE) When more than one indoor unit is connected, add 2.2 lbs (1 kg) more refrigerant to the above-mentioned
formula.
[When more than one indoor unit is connected]
Nominal outer
diameter
1/4 inch (6.35 mm) 10 ~ 13 lb·ft (14 ~ 18 N·m)
3/8 inch (9.52 mm) 25 ~ 31 lb·ft (34 ~ 42 N·m)
1/2 inch (12.70 mm) 36 ~ 45 lb·ft (49 ~ 61 N·m)
5/8 inch (15.88 mm) 50 ~ 60 lb·ft (68 ~ 82 N·m)
3/4 inch (19.05 mm) 74 ~ 89 lb·ft (100 ~ 120 N·m)
When doing refrigerant pump down 0 gal (0 cm
3
)※1
When recovering refrigerant 0.11 gal (400 cm
3
)※1
When recovering refrigerant vapor 0.11 gal (400 cm
3
)※2
When accumulator is replaced 0.26 gal (1,000 cm
3
)※3
When oil separator is replaced 0.53 gal (2,000 cm
3
)※3
When other part is replaced (except compressor) Actual measurement ※3
Standard amount of
refrigerant
8 TON 25.4 lbs (11.5 kg)
15 TON 37.5 lbs (17.0 kg)
Refilling amount (lbs)
= (λ
1
x 0.237) + (λ
2
x 0.168) + (λ
3
x 0.114) + (λ
4
x 0.074) + (λ
5
x 0.036) + (λ
6
x 0.015)
Refilling amount (kg)
= (λ
1
x 0.353) + (λ
2
x 0.25) + (λ
3
x 0.17) + (λ
4
x 0.11) + (λ
5
x 0.054) + (λ
6
x 0.022)
λ
1
=Liquid piping Φ7/8 inch total length (ft)
λ
2
=Liquid piping Φ3/4 inch total length (ft)
λ
3
=Liquid piping Φ5/8 inch total length (ft)
λ
4
=Liquid piping Φ1/2 inch total length (ft)
λ
5
=Liquid piping Φ3/8 inch total length (ft)
λ
6
=Liquid piping Φ1/4 inch total length (ft)
λ
1
=Liquid piping Ф22.22 mm total length (m)
λ
2
=Liquid piping Ф19.05 mm total length (m)
λ
3
=Liquid piping Ф15.88 mm total length (m)
λ
4
=Liquid piping Ф12.70 mm total length (m)
λ
5
=Liquid piping Ф9.05 mm total length (m)
λ
6
=Liquid piping Ф6.35 mm total length (m)
Refilling amount (lbs)
= (λ
1
x 0.237) + (λ
2
x 0.168) + (λ
3
x 0.114) + (λ
4
x 0.074) + (λ
5
x 0.036) + (λ
6
x 0.015) + 2.2
Refilling amount (kg)
= (λ
1
x 0.353) + (λ
2
x 0.25) + (λ
3
x 0.17) + (λ
4
x 0.11) + (λ
5
x 0.054) + (λ
6
x 0.022) + 1.0
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