to start heating using the panels (1
st
stage heating, YHC1) and start cooling using
the fan coil unit (1
st
stage cooling, YHC2).
Enable the swap function by setting P254 (YHC2 output signal, 1
st
stage in cooling)
to ON, depending on the requested control signal.
● For 2-pipe/2-stage applications, see 2-stage heating and cooling [➙ 83].
● If the equipment requests fan operation only in the 2
nd
stage (heating and/or
cooling), see Fan control [➙ 105] to set up the fan function (fan in the 2
nd
stage).
● For application examples, see Swap function and/or fan in the 2nd stage
[➙ 165].
All heating sequences can also be used for floor heating.
You can use fan coil unit heating/cooling sequences for floor heating or cooling by
disabling the fan via P350.
The following functions allow the control of external equipment connected to the
Q1, Q2 and Q3 relay outputs:
Switching off external equipment when the thermostat is in
Protection mode
Switching on external equipment during…
● heating/cooling demand
● heating demand
● cooling demand
Energizing the contact when…
● the heating sequence is active
● the cooling sequence is active
Humidity control:
● Output to control dehumidifier
● Output to control humidifier
● When P351 = 1 and 2, these functions are not available.
● When fan is DC 0...10 V fan (P351 = 3) or fan is disabled (P350 = 0) and
related relays are not occupied by output (configure 1 stage or 2 stage as
On/Off on RDG26..KN), these functions are available.
● Do not use these functions in combination with On/Off valve control
(P201/P203 = 2 / 4 or P204/P205 = 4) to ensure temperature control accuracy.
If these functions are required, the total maximum current on the relay outputs
(Q1+Q2+Q3) must not exceed 2 A.
Floor heating/Floor cooling
(P350)
Qx relay switching
function (P400, P401,
P402)
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