Mitsubishi Electric MXZ-SM36NAM2 Technical & Service Manual page 19

3. Power input of outdoor unit
Outdoor unit: MXZ-SM36NAM2
Indoor unit 1: PEFY-P15
Indoor unit 2: PEFY-P18
<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 (
Correction Coefficient of Indoor temperature = 1.04 × 15/(15 + 18) + 0.85 × 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 Outdoor unit Capacity (CTo), so use the following formula
PIo = Outdoor unit Cooling Rated Power Input × Correction Coefficient of Indoor temperature ×
= 2.40 × 0.94 × 0.9
= 2.03 kW
<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)
= 3.01 × 1.12 × 0.9
= 3.03 kW
OCH810A
2.40 kW
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
= 0.94
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
1.04 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
0.85 (Refer to "4-2. CORRECTION BY TEMPERATURE".)
n
×
(M / ∑ M )}
k k
k=1
3.01 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
19
(CTi)