
TC-12001
2-85
OUTDOOR UNIT
P5414950-rev.1
9
3.
Before Installation
3.1
Selection of Unit Model
(1)
Selecting Indoor Unit Capacity
Set temporarily the indoor unit capacity in each room as following.
Heating load for each room < Capacity of Indoor Unit
At this time, consider the correction factor according to temperature condition.
Then, Sum up each indoor unit capacity.
(2)
Selecting Outdoor Unit Capacity
Set temporarily the outdoor unit capacity according to the total connectable indoor unit capacity at (1).
Then, calculate maximum capacity of outdoor unit with considering the correction factor according to
temperature condition, piping length, lift and defrosting operation.
(3)
Checking Unit Capacity
Check that the value of the rated capacity of the outdoor unit calculated at (2) is larger than the value of
the total heating load (for each room) calculated at (1). In the case that there is the surplus capacity of the
outdoor unit against the total capacity of the indoor units, increase the indoor unit capacity until the outdoor
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both capacities.
(4)
Calculating each Indoor Unit Capacity
Calculate the indoor unit capacity as follows. The outdoor unit capacity is divided by the calculated indoor
unit capacities as necessary.
Capacity of Outdoor Unit = Rated Capacity x Correction Factor
Indoor Unit Capacity = Rated Capacity x Correction Factor (Room Temperature)
3.2
Indoor Unit Selection for Multiple Connected Installation
(1) The indoor unit capacity in heating mode is roughly calculated as follows.
*(Indoor Unit Outlet Air Temperature - Indoor Unit Inlet Air Temperature)
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Therefore, the temperature difference may be smaller. Especially during the heating operation, a cold
draft may be felt such as indoor units are installed to the place where the direct outlet air blows to
users. The air outlet temperature shall be considered to prevent a cold draft when designing facilities.
(2) Less than the recommended number of the indoor unit should be connected in order to prevent a cold
draft during the heating operation with the system that all the indoor units are operated simultaneously.
Indoor Unit Capacity (Heat) = * Temperature Difference x Air Flow Volume
Yes
Calculate Heating Load for each Room
Select Indoor Unit Capacity
Select Outdoor Unit Capacity
Calculate Capacity of each Indoor Unit
No
Check Unit Capacity
Rated Capacity of Outdoor Unit > Total Heating Load
(1)
(2)
(3)
(4)
Содержание RAS-3HVRNM2
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