your selection with Enter.
6. Use the arrow buttons to step, and confirm Exit-
Menu to terminate and save setting.
9. SETTING OF PREFERED VALUES/SET POINT
To change set points press ▲ or ▼ to achieve the
desired value. The set point value will flash during
setting. Confirm and terminate with Enter (
). In
cases where the selected application contains two
set point values the next value will now start to flash.
Change with ▲ or ▼ to the desired value and confirm
with Enter (
). Done!
Enter
<
<
°
C
1
Set point values and relays:
1-stage applications:
- The reference value to the left controls the function
for relay 1.
2-stage applications:
- The reference value to the left controls the function
for relay 1.
- The reference value to the right controls the func-
tion for relay 2.
Example:
Set point value for relay 1 is displayed in the upper
left-hand corner: The 'less-than' symbol (<) indicates
that the relay is calling for heat when the temperature
is lower than the set point value = heating function.
Set point value for relay 2 is displayed in the upper
right-hand corner: The 'greater than' symbol (>) indi-
cates that the relay is calling for cooling when the
temperature is higher than the set point value = coo-
ling function.
Selectable applications
Appl.
Function
Factory settings
Reference
value °C
stage 1
Reference
value °C
stage 2
Hysteresis
°C stage 1
Hysteresis
°C stage 2
Time setting in
minutes (adjustable)
1
1-stage heating thermostat
23
-
0,6
-
2
1-stage cooling thermostat
25
-
1
-
3
2-stage heating thermostat
23
21
0,6
0,6
4
2-stage cooling thermostat
25
27
1
1
5
2-stage heating and cooling thermostat
22
24
0,6
1
6
1-stage cooling thermostat with low temperature
alarm *1
5
1
1
0
0 (0-120) *3
7
1-stage heating thermostat with overheating alarm *1
50
85
0,6
0
0 (0-120) *3
8
2-stage overheating alarm *1
40
60
0
0
0 (0-120) *3
9
High and low temperature alarm *1
8
3
0
0
0 (0-120) *3
10
Gutter thermostat *2, relay 2 = fault alarm
-5
5
0,6
0,6
0 (0-120) *4
11
Gutter thermostat *2 with whole numbers, relay 2 =
fault alarm
-5
5
0,6
0,6
0 (0-120) *4
*1) The alarm relay is activated in normal oper-
ational mode and is deactivated in the event of
an alarm or power loss. In the event of an alarm
"ALARM" is displayed under the respective
alarm reference value.
*2) Double thermostat where relay 1 activate
heating when the outside temperature is
between set point 1 and 2 (the temperature at
which snow on a roof can melt and form icicles).
*3) Delayed alarm time, e.g. to allow for defrost-
ing.
*4) After-running time: To ensure de-icing.
In the event of alarm (applications 6-9) the
relay(s) are locked in the alarm condition until the
Reset button has been depressed. If the alarm
condition reverted to "normal temperature" when
the Reset button was depressed, the relay is
reset and the central button reverts to the Menu
function.
If the alarm condition persists, when press-
ing the Reset button, the relay will not be reset.
However, the central button reverts to Menu
function for 5 seconds in order to allow settings
in the menu system, or in order to change appli-
cation.
The set point values and alarm reference values
can always be adjusted even during an alarm
condition. See section 9.
CMT has a monitor for the temperature sensor
and disconnects from heating or cooling in the
event of short-circuit or interruption in the sen-
sor circuit. However this is not valid for the gutter
thermostat function in application 10.
8. SELECTION OF TEMPERATURE
SENSOR
CMT can be connected to several different types
of temperature sensor: Pt100, Pt1000, Ni1000
and the ETF series for Calectro's NTC and PTC
sensors. Pt1000 is the factory set sensor type.
2. Press the Menu button (
) to access the
menu system
3. The actual type of temperature sensor will
be displayed.
4. Press Menu-Enter to change the type of
temperature sensor
5. The actual sensor type now starts to flash
and it is now possible to select another sen-
sor type using the arrow buttons. Confirm
<
1 2
>
10. SETTING OF HYSTERESIS
CMT has an adjustable hysteresis (switching
differential) which is centred over the set point
value. The factory setting for the heating ther-
mostat is 0.6°C and for the cooling thermostat
1.0°C.
Example: A heating thermostat with set point
value of 22°C and hysteresis 0.6°C. The relay
activates the heater at lower than 21.7°C and
reverts at greater than 22.3°C.
Temperature
Relay
0
21,7
0,3°C
0,3°C
22
22,3
1
Set point
No hysteresis is used for alarm functions.
1. Press the Menu button (
) to access the
menu system
2. Step using the arrow buttons until "Hyst" is
shown on the display.
3. Press Menu-Enter to change hysteresis.
4. The actual hysteresis now starts to flash
and it is now possible to adjust the hyster-
esis using the arrow buttons. Confirm your
selection with Enter (
).
5. Use the arrow buttons to step, and confirm
Exit-Menu to terminate and save setting.