Daikin REYQ38M7W1B [12/32] Capacity correction ratio
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Daikin REYQ38M7W1B [12/32] Capacity correction ratio

Daikin REYQ44M7W1B [12/32] Capacity correction ratio
2
• Systems • Selection procedure
11
• Selection procedure
2 Capacity correction ratio
2-7 RXYQ20,32,34,46M7W1B
• Rate of change in cooling capacity • Rate of change in heating capacity
3D040058A
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 and liquid pipes (outdoor unit-branch sections) must be increased
except for the gas pipe of RX(Y)Q46M7W1B.
5 Read cooling / heating capacity rate of change in the above figures based on the following equivalent length.
Overall equivalent length = Equivalent length to main pipe x Correction factor + Equivalent length after branching
Choose a correction factor from the following table.
When cooling capacity is calculated: gas pipe size
When heating capacity is calculated: liquid pipe size.
Example
In the above case
(Cooling) Overall equivalent length
= 80m x 1.0 + 40m = 120m
(Heating) Overall equivalent length = 80m x 0.5 + 40m = 80m
The correction factor in capacity in cooling capacity when Hp=0m is thus approximately 0.82
heating capacity when Hp=0m is thus approximately 1.0
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 liquid
RXYQ20M7W1B ø 31.8 ø 19.1
RXYQ32,34M7W1B ø 38.1 ø 22.2
RXYQ46M7W1B Not Increased ø 22.2
Rate or change
(object piping)
Correction factor
Standard size Size increase
Cooling (gas pipe) 1.0 0.5
Heating (liquid pipe) 1.0 0.5
Diameter of gas pipes
Model gas liquid
RXYQ18M7W1B ø 28.6 ø 15.9
RXYQ26,28,30M7W1B ø 34.9 ø 19.1
RXYQ40,42,44M7W1B ø 41.3 ø 19.1
Equivalent lenght Equivalent lenght
Indoor unit
Outdoor unit
Branch
80 m 40 m
Gas pipe : Size increase
Liquid pipe : Standard size

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