Mitsubishi Electric PUHY-RP-Y(S)JM-B, Data Book

Page: 79 / 293

6. CAPACITY TABLES
OUTDOOR UNITS 76
6-3-3. How to obtain the equivalent piping length
1. PURY-RP200YJM-B(-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.35 x number of bent on the piping) [m]
2. PURY-RP250, 300YJM-B(-BS)
Equivalent length = (Actual piping length to the farthest indoor unit ) + (0.42 x number of bent on the piping) [m]
6-4. Correction by port counts of the BC controller
Indoor unit sizes P200 and P250 must be connected to 2 ports on the BC controller.
Indoor unit sizes from P100 to P140 should normally be connected to 2 ports on the BC controller (set BC controller DIP-SW 4-6
to its ON position).
In cases whereby indoor unit sizes from P100 to P140 are connected to only 1port on the BC controller (set BC controller DIP-SW
4-6 to its OFF position), the cooling capacity of the indoor unit should be multiplied by a correction factor of
0.97.
6-5. Correction at frost and defrost
Due to frost at the outdoor heat exchanger and the automatic defrost operation, the heating capacity of the outdoor unit can be
calculated by multiplying the correction factor shown in the table below.
Table of correction factor at frost and defrost
Outdoor inlet air temp. °C 6 4 2 1 0 -2 -4 -6 -8 -10 -20
Outdoor inlet air temp. °F 43 39 36 34 32 28 25 21 18 14 -4
PURY-RP200YJM-B(-BS) 1.00 0.95 0.84 0.83 0.83 0.87 0.90 0.95 0.95 0.95 0.95
PURY-RP250YJM-B(-BS) 1.00 0.95 0.84 0.83 0.83 0.87 0.90 0.95 0.95 0.95 0.95
PURY-RP300YJM-B(-BS) 1.00 0.93 0.82 0.80 0.82 0.86 0.90 0.90 0.95 0.95 0.95