Supply air/return air mode
The supply air setpoint is toggled as a function of return air temperature as follows:
Example 1: Return air
Actual
< Return air
Setpoint
- 2K:
Supply air temperature is controlled to return air setpoint.
Example 2: Return air
Setpoint
- 2K < Return air
Actual
< Return air
Setpoint
Setpoint is toggled between supply air and return air setpoint in linear steps (see diagram below).
Example 3: Return air
Actual
> Return air
Setpoint
:
Supply air is controlled to supply air setpoint.
When supply air temperature equals the current setpoint, opening duration of the expansion valves is reduced
tothetimerequiredtomaintainthecurrentstate.Ifonlyoneofthetwosensorsisfitted(supplyairorreturn
air),controlismadeexclusivelybythatsensor.
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