Daikin SB.RKXYQ5T8 [12/27] Capacity tables
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Daikin SB.RKXYQ5T8 [12/27] Capacity tables

Daikin SB.RKXYQ5T8 [12/27] Capacity tables
• Outdoor Unit • SB.RKXYQ-T
5
• VRV Systems • SB.RKXYQ-T
10
5 Capacity tables
5 - 3 Capacity Correction Factor
SB.RKXYQ-T
Correction ratio for cooling capacity Correction ratio for heating capacity
x-axis : Equivalent piping length [m] x-axis : Equivalent piping length [m]
y-axis : Height difference between compressor unit and furthest indoor unit [m] y-axis : Height difference between compressor unit and furthest indoor unit [m]
Notes
1. These figures illustrate the capacity correction factor due to the piping length for 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 for the capacity correction ratio, as shown it the above figures.
2. With this VRV4-i system, the following control is used:- in case of cooling: constant evaporating pressure control- in case of heating: constant condensing pressure control
3. Method of calculating the capacity of the outdoor units.
The maximum capacity of the system will be either the total capacity of the indoor units or the maximum capacity delivered by the compressor unit plus the heat exchanger unit, whichever is less.
Indoor connection ratio ≤ 100%.
= x
Indoor connection ratio > 100%.
= x
4. If the equivalent pipe length between the heat exchanger unit and the furthest indoor unit is ≥90m, it is recommended to increase the size of the main gas pipe (between compressor unit and first refrigerant branch kit).
If the recommended gas pipe (with increased size) is not available, you must use the standard size (which might result in a small capacity decrease).
5. Overall equivalent length
=x+
Choose the correction factor from the following table.
When calculating the cooling capacity: gas pipe size
When calculating the heating capacity: liquid pipe size
Example
Overall equivalent length
▪
Cooling mode
= 10 m + 10 m x 1 + 40 m = 60 m
▪
Heating mode
= 10 m + 10 m x 1 + 40 m = 60 m
Capacity correction ratio (height difference = 0)
▪
Cooling mode
= 0,89
▪
Heating mode
= 1,00
Standard size
Size increase
Cooling (gas pipe)
1,0
0,5
Heating (liquid pipe)
1,0
Overall equivalent length
Equivalent length of the main pipe
Equivalent length of the branch pipes
Model
Standard liquid side Ø
Increased liquid side Ø
Standard gas side Ø
Increased gas side Ø
5 HP
9,5
Not increased
15,9
19,1
Maximum capacity of outdoor units
Capacity from capacity table at 100% connection ratio
Correction ratio of piping to furthest indoor unit
Maximum capacity of outdoor units
Capacity from capacity table at installed connection ratio
Correction ratio of piping to furthest indoor unit
Heat exchanger
unit
Compressor unit
Gas pipe
Liquid pipe
10 m
Indoor unit
Gas pipe
Liquid pipe
10 m
40 m
Equivalent length of the branch pipe of the
furthest indoor unit
Indoor unit
Indoor unit
3D098839

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