4
System and Design Unit Selection
4.1
Selection Procedure
Step 1: Total heat load calculation
Calculate conditioned surface area
Select the heat emitters (type, quantity, water temperature and heat load)
Step 2: System configuration
Decide whether to include AHS and set AHS’s switching temperature
Decide whether backup electric heater is enabled or disabled
Step 3: Selection of outdoor units
Determine required total heat load on outdoor units
Set capacity safety factor
Select power supply
Provisionally select M-Thermal Mono unit capacity based on nominal
capacity
Correct capacity of the outdoor units for the following items:
Outdoor air temperature / Outdoor humidity / Water outlet temperature
1
/
Altitude / Anti-freeze fluid
Is corrected M-Thermal Mono unit capacity ≥ Required total heat load on
outdoor units
2
Yes
No
M-Thermal Mono system
selection is complete
Select a larger model or enable
backup electric heater operation
Notes:
1. If the required water temperatures of the heat emitters are not all the same, the M-Thermal Mono’s 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 Mono units which satisfy not only the total heating load
requirements but also the total cooling load requirements.
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