The valve receives the On command via control output Y1 (Q1 on RDG26..) or Y3
(Q2 on RDG26..), if:
1. The acquired room temperature is below the setpoint (for heating) or above the
setpoint (for cooling),
2. The control outputs are inactive for more than the "Minimum output off time"
(factory setting 1 minute, adjustable via P213).
The valve receives the Off command, if:
1. The acquired room temperature is above the setpoint (for heating) or below the
setpoint (for cooling),
2. The valve is active for more than the "Minimum output on time" (factory setting
1 minute, adjustable via P212).
● For switching differential (P051, P053, P054), see Control sequences [➙ 77].
The valve receives the On command via control output Y1 or Y2 on RDG20..KN, if:
1. The acquired room temperature is below the setpoint (for heating) or above the
setpoint (for cooling),
2. The control outputs are inactive for more than the "Minimum output off time"
(factory setting 1 minute, adjustable via P213).
The valve receives the Off command via control output Y3 or Y4 on RDG20..KN, if:
1. The acquired room temperature is above the setpoint (for heating) or below the
setpoint (for cooling),
2. The valve is active for more than the "Minimum output on time" (factory setting
1 minute, adjustable via P212).
● For switching differential (P051, P053, P054), see Control sequences [➙ 77].
The electric heater receives an On command via the auxiliary heating control
output (RDG26..KN: Q2, RDG20..KN: Y2 or Y3, see Mounting Instructions [➙ 6] [1]
& [2]), if
1. The acquired room temperature is below the "Setpoint for electric heater",
2. The electric heater is switched off for at least 1 minute.
The Off command for the electric heater is output, if
1. The acquired room temperature is above the setpoint (electric heater),
2. The electric heater is switched on for at least 1 minute.
CAUTION! A safety limit thermostat (to prevent overtemperature) must be
provided externally.
The electric heater can be controlled via the On/Off control output (RDG26..KN:
Q2, RDG20..KN: Y2 or Y3) by setting P203 or P204 to 4. For adaptive temperature
compensation (P217: RDG26..KN): see 2-pipe fan coil unit with electric heater
[➙ 81], 4-pipe fan coil unit with electric heater [➙ 95].
Heating: Output Y1 provides the Open command, and Y3 the Close command to
the 3-position actuator. Cooling: Same with Y2 and Y4.
The factory setting for the actuator run time is 150 seconds. It can be adjusted via
P214 (Y1 and Y3) or P215 (Y2 and Y4).
The parameters are displayed only, if 3-position is selected via DIP switches 7 and
8.
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