Calculating The Actual Capacity Of Each Indoor Unit; Outdoor Unit Capacity Correction Coefficient; Indoor Unit Capacity Correction Coefficients - Sanyo SPW-C0705DZH8 Technical Data Manual

1. Model Selecting and Capacity Calculator
1-5. Calculation of Actual Capacity of Indoor Unit

Calculating the actual capacity of each indoor unit

Because the capacity of a multi air-conditioner changes according to the temperature conditions, tubing length,
elevation difference and other factors, select the correct model after taking into account the various correction val-
ues. When selecting the model, calculate the corrected capacities of the outdoor unit and each indoor unit. Use the
corrected outdoor unit capacity and the total corrected capacity of all the indoor units to calculate the
actual final capacity of each indoor unit.

1. Outdoor unit capacity correction coefficient

Find the outdoor unit capacity correction coefficient for the following items.
(1) Capacity correction for the outdoor unit model
From the table of correction coefficients by horsepower on page 2-13, use the equivalent horsepower to find the
capacity correction coefficient.
However, if the outdoor air intake temperature is 35°C or higher, the capacity correction coefficient is 1.00.
(2) Capacity correction for the outdoor unit temperature conditions
From the graph of capacity characteristics on page 2-13, use the outdoor temperature to find the capacity cor-
rection coefficient.
(3) Capacity correction for the outdoor unit tubing length and elevation difference
From the graph of capacity change characteristics on page 2-14, use the tubing length and elevation difference
to find the capacity correction coefficient.
The outdoor unit correction coefficient is the value which corresponds to the most demanding indoor unit.
(4) Capacity correction for outdoor unit frosting/defrosting during heating
From the table on page 2-13, find the capacity correction coefficient.

2. Indoor unit capacity correction coefficients

Find the indoor unit capacity correction coefficient for the following items.
(2) Capacity correction for the indoor unit temperature conditions
From the graph of capacity characteristics on page 2-14, use the indoor temperature to find the capacity correc-
tion coefficient.
(3) Capacity distribution ratio based on the indoor unit tubing length and elevation difference
First, in the same way as for the outdoor unit, use the tubing length and elevation difference for each indoor unit
to find the correction coefficient from the graph of capacity change characteristics on page 2-14. Then divide
the result by the outdoor unit correction coefficient to find the capacity distribution ratio for each indoor unit.
Capacity distribution ratio for each indoor unit (3) = Correction coefficient for that indoor unit / Correction coefficient for the outdoor unit.
3. Calculating the corrected capacities for the outdoor unit and each indoor unit
The corrected capacities for the outdoor unit and each indoor unit are calculated form the formula below.
<Cooling>
Outdoor unit corrected cooling capacity (5) = Outdoor unit rated cooling capacity × Correction coefficient for
* However, if the outdoor unit corrected cooling capacity [5] is greater than 100%, then the outdoor unit corrected cooling
capacity [5] is considered to be 100%.
Corrected cooling capacity of each indoor unit (5) = Rated cooling capacity for that indoor unit × Correction coef-
ficient for indoor temperature conditions at that indoor unit ((2) Page 2-14) × Distribution ratio based on tubing
length and elevation difference at that indoor unit ((3) Page 2-14)
However, the corrected cooling capacity of each indoor unit is found as shown below.
If (2) < 100% and (2) × (3) > 100%: Corrected cooling capacity for that indoor unit [5] = Rated cooling capacity for that indoor unit
If (2) > 100%: Corrected cooling capacity for that indoor unit (5) = Rated cooling capacity for that indoor unit × (2)
model ((1) Page 2-13) × Correction coefficient for outdoor tempera-
ture conditions ((2) Page 2-13) × Correction coefficient for tubing
length and elevation difference ((3) Page 2-14)
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Design of 3-WAY ECO-i SYSTEM
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