25
Thermostat
Communication objects and ETS parameters
Fan (A/B)
ETS text
Values available
Comment
[
Default value
]
Type
0 = Off
No thermostat controlled
fan coil.
Disables the graphics for
the fan on the thermostat
too. Useful when controlling
only the solenoid valve for a
radiator system
1 = Three Speed Fan
coil
Fan coil with 3 speeds
2 = Proportional (0 -
100%)
Proportional-speed fan coil
[1]
Maximum Fan
Speed
0
Sets maximum fan coil
speed.
Set "0" to control only the
solenoid valve for a radiator
system
1
2
3
[3]
Threshold for Fan
Speed. 2
0.2 °C
Sets the difference between
the current temperature and
the setpoint that triggers
start of speed V-2
0.3 °C
0.5 °C
1.0°C
1.5°C
2.0 °C
2.5 °C
3.0 °C
3.5 °C
4.0 °C
[1.0]
Threshold for Fan
Speed. 3
0.2 °C
Sets the difference between
the current temperature and
the setpoint that triggers
start of speed V-3
0.3 °C
0.5 °C
1.0°C
1.5°C
2.0 °C
2.5 °C
3.0 °C
3.5 °C
4.0 °C
[2.0]
Fan Speed
Hysteresis
0.1 °C
Hysteresis for the
above-mentioned speed
values
0.2 °C
0.3 °C
0.4 °C
0.5 °C
0.6 °C
0.7 °C
0.8 °C
0.9 °C
1.0 °C
[1=0.1]
Switching Time
between Speeds
(min)
0...255
Time, in minutes, it takes to
switch from one speed to
another.
[2]
Fan parameters
Continued
ETS text
Values available
Comment
[
Default value
]
Time in Fan Man.
Mode (min.)
0...255
Duration of "Manual Forcing"
for the fan speed if the guest
has forced the speed; after
this time the thermostat
returns to automatic mode.
If the parameter is set to "0"
it is interpreted as "Time =
infinite" and the fan speed,
set manually, stays on. To
restore automatic opera-
tion the guest must return
the fan speed to AUTO by
manually operating on the
thermostat display.
[0]
Objects
0 = 1-bit object
Select type of object (1 bit
for On/Off, 8 bits for propor-
tional 1-100%)
1 = 8-bit object (1-
100%)
[0]
Cyclic Send Time
0 = Off
Set cyclical sending over the
bus for the fans
11 = 30 min.
[0 = Off]
Threshold for
Speed at 100%
0 = 2 °C
Absolute difference between
setpoint and current tem-
perature above which the
speed goes to 100%
1 = 3 °C
2 = 4 °C
4 = 5 °C
[4]
Minimum Fan
Speed
0 = 10%
Minimum operating speed
on fan activation
1 = 20%
2 = 30%
3 = 40%
4 = 50%
[0]
Fans independent
of the valve
Yes
Possibility of controlling the
fans even with the valve off
No
[No]
Automatic speed
disabling
Yes
Possibility of disabling the
fan button on the display
and objects 43 and 90
(Automatic)
No
[No]
Continued
IMPORTANT:
If you set "Switching Time between Speeds
(min)" to 0 and leave a low value of "Fan Speed Hysteresis"
(<0.5°C) there may be, near the speed change threshold
temperatures, continual and repeated switching of the fan coil
speeds that could damage it.
COMMUNICA
TION OBJECTS
