Additional Refrigerant Charge - Mitsubishi Electric CITY MULTI PURY-WP200YJM-A Installationshandbuch

9-9. Additional refrigerant charge

Charge refrigerant in a liquid state.
- Charging refrigerant in the gaseous state will change the composition of the refrigerant and lead
to a performance drop.
Do not use a charging cylinder when charging refrigerant.
- The use of a charging cylinder may change the composition of the refrigerant and lead to a
performance drop.
The table below summarizes the factory-charged amount of refrigerant, the maximum amount of refrigerant to be
added on site, and the maximum total amount of refrigerant in the system.
Factory-
Unit model charged
amount
M200YNW 5.2 (184)
M250YNW 5.2 (184)
M300YNW 5.2 (184)
Both refrigerant overcharge and undercharge will cause problems. Charge the system with the proper amount of
refrigerant.
Record the added refrigerant amount on the label attached to the control box panel for future servicing.
9-9-1. Calculation of the amount of additional refrigerant
・The amount of refrigerant to be added depends on the size and the total length of the high-pressure piping and
liquid piping.
・Calculate the amount of refrigerant to be charged according to the formula below.
・Round up the calculation result to the nearest 0.1 kg (0.1 oz).
・The refrigerant does not need to be added for the indoor units in a Hybrid City Multi system.
(1) Units "m" and "kg"
<Formula>
・When the piping length from the outdoor unit to the farthest HBC controller is 10 m (32 ft) or shorter
Amount of additional
charge (kg)
・When the piping length from the outdoor unit to the farthest HBC controller is longer than 10 m (32 ft)
Amount of additional
charge (kg)
<Example>
Outdoor unit model: PURY-EM300YNW-A
Main HBC controller 1 model: CMB-WM108V-AA
Main HBC controller 2 model: CMB-WM108V-AA
Sub HBC controller model: CMB-WM108V-AB
* Refer to the pipe connection examples in section 9-4 for the pipes marked with the letters below.
A : ø15.88; 18 m
1
A : ø15.88; 5 m
2
A : ø15.88; 10 m
3
B: ø15.88; 8 m
The total length of the high-pressure piping and liquid piping in each case is as follows:
ø15.88 total length: 18 (A
ø15.88 total length: 5 (A
WT08842X01
Maximum Maximum total
amount to be amount in the
added on site system
12.7 (448) 17.9 (632)
12.7 (448) 17.9 (632)
12.7 (448) 17.9 (632)
High-pressure pipe
= ø15.88 total length +
× 0.11 (kg/m)
High-pressure pipe
= ø15.88 total length +
× 0.09 (kg/m)
)
1
) + 10 (A ) + 8 (B) = 23
2 3
Unit model
EM200YNW
EM250YNW
EM300YNW
Amount
(kg/HBC controller)
2.8
Amount
(kg/HBC controller)
2.8
GB-34
Factory- Maximum
charged amount to be
amount added on site
5.2 (184) 12.7 (448)
5.2 (184) 12.7 (448)
5.2 (184) 12.7 (448)
[kg (oz)]
Maximum total
amount in the
system
17.9 (632)
17.9 (632)
17.9 (632)