R32 Split - Air to Water Heat Pump 20220105
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3. Selection and System Design
3.1 Selection procedure
Step1Total heat load calculation
Calculate conditioned surface area Select the heat emitters (type, quantity, water temperature and heat load)
Step2 System configuration
Decide whether to include AHS (auxiliary heat source) and set AHSs switching temperature Decide whether
backup electric heater is enabled or disabled
Step3Selection of outdoor units
Determine required total heat load on outdoor units. Set capacity safety factor; Select power supply
Provisionally select A-IThermal Split unit capacity based on nominal capacity
Correct capacity of the outdoor units for the following items:
Outdoor air temperature / Outdoor humidity / Water outlet temperature1 /
Altitude / Antifreeze fluid
Is corrected A-IThermal Split unit capacity Required total heat load on outdoor units
Notes:
1. If the required water temperatures of the heat emitters are not all the same, the A-IThermal Splits outlet water
temperature setting should be set at the highest of the heat emitter required water temperatures. If the water outlet
design temperature falls between two temperatures listed in the outdoor unit's capacity table, calculate the
corrected capacity by interpolation.
2. If the outdoor unit selection is to be based on total heating load and total cooling load, select Split units which
satisfy not only the total heating load requirements but also the total cooling load requirements.
System selection s complete
Select a larger model or enable
backup electric heater operation
Yes
NO
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