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EPH CONTROLS CDT2-24 Room Thermostat Instruction Manual
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Operating Instructions
CDT2-24 Room Thermostat with Delay Start
OFF
10. High and Low temperature limitation
14. Normal control mode (On/Off )
An upper and lower temperature limit may be chosen.
When the temperature falls below the setpoint temperature, the flame
symbol will appear and the thermostat will switch on.
When the temperature rises above the setpoint temperature, the flame
Set
Press and hold the and buttons for 10 seconds.
“Limit OFF”will appear on the screen.
Press the
button to select “Limit ON”mode.
Press the button to confirm you wish to adjust the high limit temperature.
Press the and buttons to select the high limit temperature.
Press the button to select the low limit temperature mode.
Press the and buttons to select the low limit temperature.
Set
symbol
will disappear and the thermostat will switch off.
Graph (14.1): On / Off Control
Set
Temp
Set
22˚C
21˚C
20˚C
19˚C
18˚C
17˚C
Press the button and the thermostat is ready for operation.
Setpoint Temperature
“Limit”will appear on the screen.
To deactivate High and Low temperature limitation.
Set
Press and hold the and buttons for 10 seconds.
“Limit ON”will appear on the screen.
Press the
button to deactivate this function.
“Limit OFF”will appear on the screen.
Set
Time Minutes
0
20
40
60
80
100
Press the button and the thermostat is ready for operation.
11. Adjusting the switching differential (Normal)
15. Delay start control mode
Set
Press the
button once, Diff set will appear on the screen.
Delay start is an energy saving mode.
The factory default switching differential of 0.40C will appear on the screen.
When the delay start function is active the flame symbol will continuously
flash on the screen. When in this mode the activation of the thermostat is
delayed by a variable time depending on the current temperature, setpoint
temperature and also the fall in temperature from when the delay start has
activated. See graph (15.1) Delay Start Control.
Press the
Press the
and
buttons to select the desired differential from 0.2 - 1˚C.
Set
button to return to normal operation.
12. Adjusting the setpoint temperature
Graph (15.1): Delay Start Control
48.0
42.0
36.0
30.0
24.0
18.0
12.0
6.0
Press the
or
buttons to adjust the temperature setpoint.
13. Changing the thermostat mode
P1 - Normal On/Off mode
P2 - Delay Start mode (DS)
P3 - Time Proportional Integral Mode (TPI)
0.0
0
1
2
3
4
5
6
Press the ‘Reset’ button at the side of the thermostat.
Temperature below thermostat setting °C
P1 will appear on the screen.
Use the
or
buttons to change between P1 to P2 and P3.
The flame symbol
will continue to flash until the thermostat activates.
Select P1 for normal operation.
Select P2 for delay start.
When activated the thermostat will allow the heating system time to reach
the setpoint and delay start will remain inactive until it reaches this setpoint.
Set
Delay start can be reactivated by:
Select P3 for TPI – If P3 is selected you can press the
the amount of cycles and then press the
proportional bandwidth.
button to choose
Set
button to choose the
Lowering the setpoint below the current temperature, pressing the
‘standby’ button to set the temperature, then raising the setpoint above the
zone temperature within 6˚C of the setpoint.
Press the
‘standby’ button to confirm.
The heating will be delayed as per the line on the graph.
If the difference between the actual temperature and the setpoint is 10C the
See section 16 for more information on TPI.
thermostat will delay starting for circa 40 minutes.
If the difference between the actual temperature and the setpoint is 30C the
thermostat will delay starting for circa 24 minutes.
If the difference is 60C or more, the heating will be switched on immediately.
The time delay will change if the temperature drops from the original
calculation.
To deactivate Delay Start, see section 13.
EPH Controls Ireland
EPH Controls UK
20221006_CDT2-24-DS_Opins_PK
| General | Details |
|---|---|
| Name | EPH CONTROLS CDT2-24 Room Thermostat Instruction Manual |
| Make | EPH CONTROLS |
| Language | English |
| Filetype | PDF (Download) |
| File size | 0.19 MB |
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