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Valve outputs | Valve output - General
–
Disadvantage:
It should be noted, that, due to the full valve lift, the life expectancy of the actu-
ators can diminish. For very long cycle times (> 15 minutes) with less sluggish-
ness in the system, the heat emission into the room, for example, in the vicin-
ity of the radiators, can possibly be non-uniform and be found disturbing.
This cycle time setting is recommended for slower, more sluggish heating sys-
tems (such as underfloor heating).
Even for a bigger number of triggered actuators, maybe of different types, this
setting can be recommended to be able to obtain a better mean value of the
adjusting travels of the valves.
Case 2
Cycle time < Adjusting cycle time of the drives used (ETA)
In this case, the switch-on and switch-off times of the actuator are too short for the
actuators to have enough time to fully open and fully close within a given period
(see figure 16).
–
Advantage: This setting ensures continuous water flow through the radiators,
thus facilitating uniform heat emission into the room. If only one valve drive is
triggered the controller can continuously adapt the command value to com-
pensate the mean value shift caused by the short cycle time, thus setting the
desired room temperature.
–
Disadvantage: If more than one drive is activated at the same time, the de-
sired mean value will become the command value, which will result in a very
poor adjustment of the required room temperature, or in adjustment of the lat-
ter with major deviations, respectively.
This setting is recommended for quicker heating systems (such as radiators).
Heating actuator 6-gang with controller | Order no. 2139 00 | 21393100
Image 15: Ideal course of the valve stroke for a
Cycle time > 2 x Adjusting cycle time
Page 71 of 257
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