Mitsubishi Electric PURY-WP200 Service Manual page 131

[ VIII Test Run Mode ]
3. Amount of refrigerant to be added
The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units.
The amount necessary for extended pipe (field piping) is not included and must be added on site.
Outdoor unit model
Amount of pre-charged refrigerant
in the outdoor unit (kg)
(1) Calculation formula
The amount of refrigerant to be added depends on the size and the length of field piping. (unit in m[ft])
Amount of added refrigerant (kg) = (0.16 x L
L : Length of ø19.05 [3/4"] high pressure pipe (m)
1
L : Length of ø15.88 [5/8"] high pressure pipe (m)
2
:Refer to the table below.
1
Outdoor unit total index
WP200, WP250 models
Round up the calculation result to the nearest 0.1kg. (Example: 18.04kg to 18.1kg)
(2) Example
[WP200, WP250YJM]
Outdoor unit
A
Indoor unit
(15 ~ 50)
(3) Sample calculation
Indoor 1: 50
2: 50
3: 50
4: 40
Outdoor WP250
HWE1113B
WP200
11.8
) + (0.11 x L
1
Amount for the HBC controller
(kg)
1
3.0
HBC controller
Indoor unit
(15 ~ 50)
A: ø19.05 42 m
WP250
11.8
) +
2 1
Outdoor unit index
Diameter of high-
pressure pipe
Indoor unit
(15 ~ 50)
Indoor unit
(15 ~ 50)
The total length of each liquid line is as follows:
ø19.05: A = 42 m,
Therefore,
At the
<Calculation example>
conditions
Additional refrigerant charge
below:
= 42 × 0.16+3.0
= 9.72 kg
* All pipe work except A is water pipe work.
- 122 -
WP200 WP250
ø ø
15.88 19.05
=3.0
GB