• VRV
®
Systems • Outdoor Unit
23
• Outdoor Unit • VRV
®
III heat recovery, with connection to heating only hydrobox • REYAQ-P
4
Capacity tables
4 - 3 Capacity Correction Factor
1. Rate of change in heating capacity
2. Rate of change in cooling capacity
3TW60652-2A
NOTES
[Capacity correction]
1.
These figures illustrate the rate of change in capacity (
Į
) of a standard indoor unit system at maximum load under standard conditions.
Moreover, under partial load conditions there is only a minor deviation from the rate of change in capacity shown in the fi gures above.
2.
With this outdoor unit, constant evaporating pressure control during cooling and constant condensing pressure control during heating is carried out.
3.
Method of calculating capacity (connection ratio
100%)
[Capacity] = [Capacity under 100% connection ratio (capacity table)] X (correction factor for capacity (
Į
) due to piping length to farest indoor unit]
Method of calculating capacity (connection ratio > 100%)
[Capacity] = [Capacity under xxx% connection ratio (capacity table)] X (correction factor for capacity (
Į
) due to piping length to farest indoor unit]
[Equivalent piping length correction]
4.
When overall equivalent piping length is 90m or more, the diameter of the main liquid pipes must be increased.
5.
[Overall equivalent piping length] = [equivalent piping length to main pipe] X [correction factor (
ȕ
)] + [equivalent length after branching]
Model
Liquid
standard
Liquid
increased
Correction factor (
ȕ
)
(heating)
Correction factor (
ȕ
)
(cooling)
REYAQ10P
9.5 Ø
12.7 Ø
0.2
0.5
[EXAMPLE]
Equivalent length
60m
Equivalent length
30m
Outdoor unit
Branch
Liquid pipe: Size increase
REYAQ10P
[Explanation of symbols]
Hp: Level difference (m) between indoor and outdoor unit (outdoor unit is on highest location)
Hm: Level difference (m) between indoor and outdoor unit (outdoor unit is on lowest location)
A. Overall equivalent piping length = 60m X 0.2 + 30 = 42m (heating;
ȕ
=0.2)
B. Overall equivalent piping length = 60m X 0.5 + 30 = 60m (cooling;
ȕ
=0.5)
C. The correction factor for capacity when H=0m:
Į
= 1 (heating)
D. The correction factor for capacity when H=0m:
Į
= 0.91 (cooling)
Equivalent piping length (m)
Height dif
ference between outdoor and farest
indoor (m)
Equivalent piping length (m)
Height dif
ference between outdoor and farest
indoor (m)
Indoor
