Daikin REYQ14PY1B [95/137] Capacity tables
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Daikin REYQ14PY1B [95/137] Capacity tables

Daikin REYQ14PY1B [95/137] Capacity tables
• Outdoor Units • VRV HEAT RECOVERY • REYQ8-48P7Y1B
1
3
• VRV Systems • Outdoor Units
94
3 Capacity tables
3 - 4 Capacity correction factor
REYQ12,18,20,28,30,38,40,42,44P
3D057935A
1. Rate of change in cooling capacity 2. Rate of change in heating 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 A/C (cooling/heating) capacity:
The maximum A/C capacity of the system will be either the total A/C capacity of the indoor units obtained from capacity characteristic table or the maximum A/C capacity of outdoor units as mentioned
bellow, whichever smaller.
Calculating A/C capacity of outdoor units
• Condition: Indoor unit combination ratio does not exceed 100%.
Maximum A/C capacity of outdoor units
= A/C capacity of outdoor units obtained from capacity characteristic table at the 100% combination
X Capacity change rate due to piping length to the farthest indoor unit
• Condition: Indoor unit combination ratio exceeds 100%.
Maximum A/C capacity of outdoor units
= A/C capacity of outdoor units obtained from capacity characteristic table at the combination
X Capacity change rate due to piping length to the farthest indoor unit
4. When overall equivalent pipe length is 90m or more, the diameter of the main gas pipes (outdoor unit-branch sections) must be increased.
When level difference is 50m or more, the diameter of the main liquid pipe (outdoor unit-branch sections) must be increased.
[Diameter of above case]
Model Liquid Model Liquid Model Liquid
REYQ12PY1 J15.9 REYQ30PY1
J22.2
REYQ44PY1 J22.2
REYQ18PY1 J19.1 REYQ38PY1
REYQ26PY1
J22.2
REYQ40PY1
REYQ28PY1 REYQ42PY1
5. When the main sections of the interunit gas pipe diameters are increased the overall equivalent length should be calculated as follows. (Heating only)
Overall equivalent length
= Equivalent length to main pipe x Correction factor + Equivalent length after branching
[Choose a correction factor from the following table]
Model Correction factor Model Correction factor
REYQ12PY1 0.3 REYQ38PY1
0.4
REYQ18PY1
0.4
REYQ40PY1
REYQ26PY1 REYQ42PY1
REYQ28PY1 REYQ44PY1
REYQ30PY1
(Example) In case of REYQ18PY1
Equivalent length Equivalent length
Indoor unit
Outdoor unit
Liquid pipe:
Size increase
Branch
BS unit
In the above case (Heating)
Overall equivalent length
=80mx 0.4 +40m=72m
The correction factor in capacity when Hp=0m is thus approximately 1.0.
6. In the combination which does not include cooling only indoor unit, Calculate the equivalent length pipe by the following when you calculate cooling capacity.
Overall equivalent length
= Equivalent length to main pipe x0.5+ Equivalent length after branching
Example:
Equivalent length Equivalent length
Indoor unit
Outdoor unit
Branch
BS unit
In the above case (Cooling)
Overall equivalent length
=80mx 0.5 +40m=80m
The correction factor in capacity when Hp=0m is thus approximately 0.88.
Explanation of symbols
H
p
: Level difference (m) between indoor and outdoor units where indoor in inferior position.
H
M
: Level difference (m) between indoor and outdoor units where indoor in superior position.
L : Equivalent pipe length (m)
α : Capacity correction factor
[Diameter of pipe (standard size)]
Model Liquid Model Liquid
REYQ12PY1 J12.7 REYQ38PY1
J19.1
REYQ18PY1 J15.9 REYQ40PY1
REYQ26PY1
J19.1
REYQ42PY1
REYQ28PY1 REYQ44PY1
REYQ30PY1

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