Mitsubishi Electric MXZ-4C36NAHZ Technical & Service Manual page 19

<Heating>
(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. 26.6°F [ 3°C] W.B., Indoor temp. 68.0°F [20°C] D.B.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 26.6°F [ 3°C] W.B., Indoor temp. 77.0°F [25°C] D.B.)
Average indoor temp. power input coefficient (
= 1.34 × 15/(15 + 18) + 1.09 × 18/(15 + 18)
= 1.20
(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 TEMPERATURE".)
(4) Outdoor power input (PIo)
Maximum System Capacity (CTx) = Total Indoor unit Capacity (CTi), so use the following formula
PIo = Outdoor unit Heating Rated Power Input × Correction Coefficient of Indoor temperature × (CTi)
= 3.34 × 1.20 × 0.9
= 3.61 kW
OCH573E
n n
c
) × (M
ave k k
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
3.34 kW
1.34 (Refer to "4-2. CORRECTING BY TEMPERATURE".)
1.09 (Refer to "4-2. CORRECTING BY TEMPERATURE".)
)}
k
80)