Mitsubishi Electric PUMY-P36NKMU2-BS Technical & Service Manual page 17

<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. 70°F [21.1°C] D.B.)
Coefficient of the outdoor unit for indoor unit 2 (Outdoor temp. 26.6°F [−3°C] W.B., Indoor temp. 78.8°F [26°C] D.B.)
Average indoor temp. power input coefficient (
Correction Coefficient of Indoor temperature = 1.16 × 15/(15 + 18) + 1.09 × 18/(15 + 18)
(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 Indoor unit Capacity (CTi), so use the following formula
PIo = Outdoor unit Heating Rated Power Input × Correction Coefficient of Indoor temperature × (CTi)
= 3.02 × 1.12 × 0.9
= 3.04 kW
OCH695B
n
c
)
= ∑ {c
k
ave
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 → 80)
k
= 1.12
17
3.02 kW
1.16 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
1.09 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
n
×
(M / ∑ M )}
k k
k=1