User Manual

Functions
Additional functions
4
52 | 146 A6V11545892_en--_a
To enable the relay function, set P400 (output Q1), P401 (output Q2) or P402
(output Q3) to 8. The humidification S-Mode object sends ON to the bus as soon
as the output is energized.
When the humidity falls below the low setpoint or exceeds the high setpoint, the
symbol is displayed and the S-Mode object HumDehumMode sends the
corresponding state on the bus.
When the humidity reaches setpoint humidity high (P024), the thermostat shifts the
temperature setpoint to reduce the relative humidity in the room.
The maximum shifting temperature setpoint can be set via P461 in Expert level
with a setting range of -3…3 K, depending on the connected equipment. The
factory setting is 3 K.
The maximum shifting temperature setpoint value is reached at setpoint humidity
high (P024) +10%.
The positive values of P461 (0.5…3.0 K) are used for heating and cooling systems,
or a heating system in a humid cold environment.
For heating and cooling systems, both temperature setpoints (heating and cooling)
are shifted in parallel (that is, dead zone remains unchanged).
For systems with heating and cooling applications, the value of the dead zone
(P055) should be bigger than the maximum shifting temperature setpoint (P461), in
order to avoid changeover between heating and cooling sequences in case of fast
humidity changes in the room.
For applications with powerful cooling water systems (temperature of cold surfaces
is lower than the dewpoint temperature of the humid air), dehumidification can be
reached by reducing the room temperature, because the vapor in the air
condensates on the surface of the cooling system. In this case, set P461 to a
negative value (-0.5…-3.0 K).
Humidification
HumDehumMode
Max. shift temperature
setpoint (P461)
P461 > 0 K
Note
P461 < 0 K