Part 1
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General Information
5 Selection Procedure
5.1 Procedure
Step 1: Establish design conditions
Step 2: Select indoor units
Step 3: Select outdoor unit
Notes:
1. If the indoor design temperature falls between two temperatures listed in the indoor unit's capacity table, calculate the corrected capacity by interpolation.
If the indoor unit selection is to be based on total heat load and sensible heat load, select indoor units which satisfy not only the total heat load requirements
of each room but also the sensible heat load requirements of each room. As with total heat capacity, the sensible heat capacity of indoor units should be
corrected for indoor temperature, interpolating where necessary. For the indoor unit capacity tables, refer to the indoor unit technical manuals.
Design temperature and humidity (indoor and outdoor)
Required heat load of each room
System peak load
Piping length, level differences
Indoor unit specifications (type and quantity)
Decide indoor unit safety factor
Select indoor unit models ensuring that:
Indoor unit capacity corrected for indoor air temperature WB
1
≥ Required heat load × Indoor unit safety factor
Determine required total heat load on the outdoor unit
Use the sum of the peak load of each room
Provisionally select outdoor unit capacity based on combination ratio limitations
Confirm that the number of indoor units connected to the outdoor unit is within limitation
Correct cooling and heating capacities of the outdoor unit for the following items:
Outdoor air temperature / Indoor air temperature WB / Combination ratio / Piping length, level difference
/ Piping heat loss / Frost accumulation (for heating capacity only)
Is corrected outdoor unit capacity ≥ Required total heat load on outdoor unit?
VRF system selection is complete
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