Capacity Correction Ratio - Daikin FXZQ-MVE Introduction Manual

7 Selection procedure
7-2

Capacity correction ratio

7-2-1 RXYQ5MY1B
• Rate of change in cooling capacity
NOTES
1 These figures illustrate the rate of change in capacity of a standard indoor unit system at maximum load (with the thermostat set to maximum)
under standard conditions.
Moreover, under partial load conditions there is only a minor deviation from the rate of change in capacity shown in the above figures.
2 With this outdoor unit, evaporating pressure constant control when cooling, and condensing pressure constant control when heating is carried out.
3 Method of calculating cooling / heating capacity (max. capacity for combination with standard indoor unit)
cooling / heating capacity = cooling / heating capacity obtained from performance characteristics table x each capacity rate of change
When piping length differs depending on the indoor unit, maximum capacity of each unit during simultaneous operation is:
cooling / heating capacity = cooling / heating capacity of each unit x capacity rate of change for each piping length
4 When overall equivalent pipe length is 90m or more, the diameter of the main gas pipes (outdoor unit-branch sections) must be increased.
Diameter of above case
Model gas
RXYQ5MY1B ø 19.1
5 When the main sections of the interunit gas pipe diameters are increased the overall equivalent length should be calculated as follows.
Overall equivalent length = Equivalent length to main pipe x 0.5 + Equivalent length after branching
Example
Equivalent lenght Equivalent lenght
80 m
Size increase
Outdoor unit
Branch
In the above case (Cooling)
Overall equivalent length = 80m x 0.5 + 40m = 80m
The correction factor in capacity when H
EXPLANATION OF SYMBOLS
H : Level difference (m) between indoor and outdoor units with indoor unit in inferior position
p
H : Level difference (m) between indoor and outdoor units with indoor unit in superior position
M
L : Equivalent pipe length (m)
α
: Capacity correction factor
Diameter of gas pipes
Model gas
RXYQ5MY1B ø 15.9
• Introduction
40 m
Indoor unit
= 0m is thus approximately 0.78
p
• Systems • Introduction
• Rate of change in heating capacity
1
7
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