Mitsubishi Electric CMB-WM108V-AA Service Handbook page 135

[ VII Test Run Mode ]
Outdoor unit index
(Heat source unit model)
(E)P200
(E)P250
(E)P300
(E)P350
(E)P400
(E)P450
(E)P500
Amount for the HBC controller
α (kg)
1
3.0
Round up the calculation result to the nearest 0.1kg. (Example: 18.04kg to 18.1kg)
(2) Example
Outdoor unit
(~(E)P350) (Heat source unit)
A
Indoor unit
(10 ~ 50)
Outdoor unit
A
HWE1708A
Diameter of
high-pressure pipe
ø15.88
ø19.05
ø19.05
ø19.05
ø15.88
ø19.05
ø19.05
HBC controller
Indoor unit Indoor unit
(10 ~ 50) (10 ~ 50)
((E)P300~) (Heat source unit)
B
HBC controller
C
D
HBC controller
Indoor unit Indoor unit
(10 ~ 50) (10 ~ 50)
(3) Sample calculation
Indoor
Outdoor
Indoor unit
(10 ~ 50)
The total length of each liquid line is as follows:
ø19.05: A = 42 m,
Therefore,
<Calculation example>
Additional refrigerant charge
= 42 × 0.14 + 3.0
= 8.88 kg
= 8.9 kg
* All pipe work except A is water pipe work.
Indoor
Indoor unit
Outdoor
(10 ~ 50)
The total length of each liquid line is as follows:
Indoor unit
ø22.2: A = 18 m, ø15.88: B + C + D = 23m,
(10 ~ 50)
Therefore,
<Calculation example>
Additional refrigerant charge
= 18 × 0.23+ (5 + 10 + 8) × 0.11 + 3.0 × 2
= 12.67 kg
= 12.7 kg
* All pipe work except A, B, C, D is water pipe work.
- 126 -
1: 50 A: ø19.05 42 m
2: 50
3: 50
4: 40
P250
α = 3.0
1
1: 50 A:ø22.2 18 m
2: 50 B:ø15.88 5 m
3: 50 C:ø15.88 10 m
4: 50 D:ø15.88 8 m
P400
α = 3.0 × 2
1
GB