Heat pump 50Hz/R410A
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3. Installation of outdoor unit
Part 3 Design and installation
3. Installation of outdoor unit
3.8.2 Refrigerant charge
The calculation of the additional charge should be taken into account for the additional length of pipe.
n
(1Ø)
Additional charge (g)
= ((A Room Installation Length – Standard Length (A) ) x a
+ (B Room Installation Length – Standard Length (A) ) x a +.. )
- CF(Correction Factor) x 150
h
CF = Max. number of connectable indoor unit – Total number of connected indoor unit
If the total additional charge value after calculation comes out to be negative, then do not consider additional charge.
NOTE
Model
Standard length, A (m)
Additional refrigerant, a (g/m)
A2UW14GFA0 [MU2M15 UL2]
7.5
20
A2UW16GFA0 [MU2M17 UL2]
7.5
20
A3UW18GFA0[MU3M19 UE2]
7.5
20
A3UW21GFA0[MU3U21 UE2]
7.5
20
A4UW24GFA0[MU4M25 U42]
7.5
20
A4UW27GFA0[MU4M27 U42]
7.5
20
A5UW30GFA0[MU5M30 U42]
7.5
20
A5UW40GFA0[MU5M40 U42]
7.5
20
Model
Main piping length
Branch piping length
Standard Length, A (m)
Additional refrigerant, a (g/m)
Standard Length, B (m)
Additional refrigerant, b (g/m)
A7UW40GFA0 [FM40AH U42]
5
50
5
20
A8UW48GFA0 [FM48AH U32]
5
50
5
20
A9UW56GFA0 [FM56AH U32]
5
50
5
20
n
(1Ø , 3Ø)
Additional charge (g)
= (( Total Main piping Length - Main Standard Length (A) ) x a
+ (A Room Branch Length – Standard Length (B) ) x b
+ (B Room Branch Length – Standard Length (B) ) x b
+ (C Room Branch Length – Standard Length (B) ) x b +.. )
- CF(Correction Factor) x 100
h
CF = Max. number of connectable indoor unit – Total number of connected indoor unit
Model
Main piping length
Branch piping length
Standard Length, A (m)
Additional refrigerant, a (g/m)
Standard Length, B (m)
Additional refrigerant, b (g/m)
A7UW42LFA0 [FM41AH U32]
5
50
5
20
A8UW48LFA0 [FM49AH U32]
5
50
5
20
A9UW56LFA0 [FM57AH U32]
5
50
5
20
