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7
• Systems • Introduction
29
• Introduction
7 Selection procedure
7-2 Capacity correction ratio
7-2-1 RXYQ5MY1B
•Rate of change in cooling capacity • Rate of change in heating capacity
3D040052
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.
2With this outdoor unit, evaporating pressure constant control when cooling, and condensing pressure constant control when heating is carried out.
3Method 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
4When overall equivalent pipe length is 90m or more, the diameter of the main gas pipes (outdoor unit-branch sections) must be increased.
5When 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
In the above case (Cooling)
Overall equivalent length = 80m x 0.5 + 40m = 80m
The correction factor in capacity when H
p
= 0m is thus approximately 0.78
EXPLANATION OF SYMBOLS
H
p
: Level difference (m) between indoor and outdoor units with indoor unit in inferior position
H
M
: Level difference (m) between indoor and outdoor units with indoor unit in superior position
L: Equivalent pipe length (m)
α : Capacity correction factor
Diameter of above case
Model gas
RXYQ5MY1B ø 19.1
Diameter of gas pipes
Model gas
RXYQ5MY1B ø 15.9
Equivalent lenght Equivalent lenght
Indoor unit
Outdoor unit
Branch
Size increase
80 m 40 m
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