MXZ-SM36NAMHZ Service Manual

19
OCH789
n: Total number of the indoor units
k: Number of the indoor unit
c
k
: Outdoor unit power input coefficient of k indoor unit room temp.
M
k
: Number part of the k indoor unit model (e.g. P80 → 80)
<Heating>
(1) Rated power input of outdoor unit 3.02 kW
1.16 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
(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.)
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
1.09 (Refer to “4-2. CORRECTION BY TEMPERATURE”.)
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.)
Correction Coefficient of Indoor temperature = 1.16 × 15/(15 + 18) + 1.09 × 18/(15 + 18)
= 1.12
n
k=1
n
k=1
Average indoor temp. power input coefficient ( c
ave
) = ∑ {c
k
× (M
k
/ ∑ M
k
)}
(4) Outdoor power input (PIo)
(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”.)