Mitsubishi Electric MXZ-4C36NAHZ Technical & Service Manual page 18

3. Power input of outdoor unit
Outdoor unit : MXZ-4C36
Indoor unit 1 : MSZ-FH15
Indoor unit 2 : MSZ-FH18
<Cooling>
(1) Rated power input of outdoor unit
(2) Calculation of the average indoor temperature power input coefficient
Coefficient of the outdoor unit for indoor unit 1 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 68.0°F [20.0°C] W.B.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 98.6°F [37.0°C] D.B., Indoor temp. 64.4°F [18.0°C] W.B.)
Average indoor temp. power input coefficient (
= 1.04 × 15/(15 + 18) + 0.85 × 18/(15 + 18)
= 0.94
(3) Coefficient of the partial load (CTi)
Total Indoor units capacity
15 + 18 = 33, thus, (CTi) = 0.9 (Refer to the tables in "4-4.STANDARD CAPACITY DIAGRAM".)
(4) Outdoor power input (PIo)
Maximum System Capacity (CTx) = Total Outdoor unit Capacity (CTo), so use the following formula
PIo = Outdoor unit Cooling Rated Power Input × Correction Coefficient of Indoor temperature ×
= 2.57 × 0.94 × 0.9
= 2.2 kW
OCH573E
n
c
) × (M
k k
ave
k=1 k=1
n: Total number of the indoor units
k: Number of the indoor unit
c : Outdoor unit power input coefficient of k indoor unit room temp.
k
M : Number part of the k indoor unit model (e.g. P80
k
2.57 kW
1.04 (Refer to "4-2. CORRECTING BY TEMPERATURE".)
0.85 (Refer to "4-2. CORRECTING BY TEMPERATURE".)
n
)}
k
80)
(CTi)