© 2009 Merten by Schneider Electric
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Push-button, 4-gang plus with room temperature control unit and IR receiver
Multifunction with RTCU and FanCoil 1817/1.0
Getting to know and parameterising the room temperature control unit
Adjust the setpoint ranges for heating and cooling
together
|
The difference between the two setpoints (heating
and cooling) is interpreted as the insensitive zone.
Example:
The upper and lower setpoint adjustment is 3 K respec-
tively.
Actual value = 21 °C; Heating setpoint = 22 °C; Cooling
setpoint = 24 °C, this results in an insensitive zone of
2 K.
If you now adjust the setpoint temperature downwards
using the display, then the following values are dis-
played: 22,0; 21,5; 21,0; 20,5; 20,0; 19,5; 21,0.
The jump from 19.5 to 21.0 can be explained by the fact
that the cooling setpoint is relevant now because the
actual temperature is more than or the same as the
cooling setpoint temperature. Depending on the set-
ting, this setpoint adjustment affects all the operation
modes or just the current operation mode.
Setting "Setpoint adjustment affects current operation
mode only": If comfort mode is currently activated, you
can adjust the comfort setpoints for heating and cooling
together, but you can not adjust the values for standby
or night operation.
Two-stage heating or cooling
In order to shorten the heat-up phase with slow heating
systems (e.g. underfloor heating), a second, more re-
sponsive heating system that heats up faster during the
long start-up period of the main system (basic level) is
frequently used.
The same behaviour applies with cooling systems.
The additional level, which is controlled via 2-step con-
trol, remains switched on until a parameterised interval
below the basic level is reached (e.g. 2 K), and then
switches off. Only the basic level then remains switched
on.
Example:
• Setpoint temperature: 21 °C
• Interval between basic level - additional level: 2 K
• Hysteresis of additional level: 1 K
The additional level remains switched on until "Setpoint
temperature minus interval" (21 °C - 2 K = 19 °C) is
reached. The additional level is then switched off.
It is only switched on again when the actual tempera-
ture is lower than the "setpoint temperature minus inter-
val minus hysteresis" (21 °C - 2 K - 1 K = 18 °C).
The push-button displays the active basic level with a
"1" and the active additional level with a "2".
°C
24
23
22
21
20
23,5
22,5
21,5
20,5
19,5
Actual value
Setpoint adjustment
Cooling setpoint
Heating setpoint
22
21
20
21,5
20,5
19,5
°C
19 -> 21
Heating/Cooling
output
t (min)
0
30
60
90
Basic level
Additional level
Correcting variable
additional level
Room temperature
(°C)
Setpoint temperature
1
0
18
19
21
