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5
• VRV Systems • RXYSCQ-TV1
11
• Outdoor Unit • RXYSCQ-TV1
5
Capacity tables
5 - 3 Capacity Correction Factor
RXYSCQ-TV1
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 outdoor unit and furthest indoor unit [m]
y-axis
:
Height difference between outdoor 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.
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 of the outdoor units as mentioned below, whichever is less.
Indoor connection ratio
ч
100%.
=
x
Indoor connection ratio > 100%.
=
x
4. When the overall equivalent piping length is 90 m or more, the diameter of the main gas pipes (outdoor unit - branch sections) must be increased.
For the new diameters, see below.
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
ඵ
Cooling mode
= 80 m x 0,5 + 40 m = 80 m
ඵ
Heating mode
= 80 m x 0,5 + 40 m = 80 m
Capacity correction ratio (height difference = 0)
ඵ
Cooling mode
= 0,78
ඵ
Heating mode
= 1,0
Cooling (gas pipe)
1,0
0,5
Heating (liquid pipe)
1,0
0,5
RXYSCQ5TMV1B
Overall equivalent length
Equivalent length of the main pipe
Correction factor
Equivalent length of the branch pipes
Standard size
Size increase
Model
Standard liquid side Ø
Increased liquid side Ø
Standard gas side Ø
Increased gas side Ø
RXYSCQ4TMV1B
9,5
Not increased
15,9
19,1
With this outdoor unit, the following control is used:
- in case of cooling: constant evaporating pressure control
- in case of heating: constant condensing pressure control
Maximum capacity of outdoor units
Capacity of outdoor units from capacity table at 100% connection ratio.
Correction ratio of piping to furthest indoor unit
Maximum capacity of outdoor units
Capacity of outdoor units from capacity table at installed connection ratio.
Correction ratio of piping to furthest indoor unit
80 m
Main gas pipe
Main liquid pipe
Equivalent length of the branch pipe of the furthest
indoor unit
40 m
3D094660
