EPH CONTROLS CDT2-24 Room Thermostat Instruction Manual

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Operating Instructions  

CDT2-24 Room Thermostat with Delay Start  

Contents  

1. Factory default settings  

2. Specification & wiring  

3. Mounting  

4. Installation  

CAUTION!  

Before commencing any work on the electrical  

connections, you must first disconnect the thermostat  

from the mains. None of the 24V connections must be live  

until the installation has been completed and the housing  

is closed. Only qualified electricians or authorised service  

staff are permitted to open the thermostat.  

5. Wiring diagram  

6. Frost protection  

7. Button / symbol description  

8. Resetting the thermostat  

9. Keypad lock and unlock  

10. High and Low temperature limitation  

11. Adjusting the switching differential  

12. Adjusting the setpoint temperature  

13. Changing the thermostat mode  

14. Normal control mode (On / Off)  

15. Delay start control mode  

16. Time Proportional Integral Mode (TPI)  

There are parts that may carry mains voltage behind the  

cover. The thermostat must not be left unsupervised  

when open. (Prevent non specialists and especially  

children from gaining access to it.)  

Important: Keep this document  

Prior to setting the thermostat, it is neccessary to  

complete all required settings described in this section.  

5. Wiring diagram  

1. Factory default settings  

Contacts:  

Volt Free  

Temperature indicator:  

Switching differential:  

In built frost protection:  

High and Low temp. limitation: Off  

Blue backlight activated :  

Keypad lock:  

°C  

0.4°C  

5°C  

INTERNAL WIRING DIAGRAM CDT2-24  

3 2 1 L N  

ON COM OFF  

24Vac  

SUPPLY  

for 10 secs after any button is pressed  

Off  

If 24Vac output is required, terminals L & 2 must be electrically linked.  

2. Specifications & wiring  

5°C  

6. Frost protection  

Power supply:  

24Vac 50Hz  

8 VA  

5 ... 35°C  

0 ... 50°C  

Frost protection is built into this thermostat, it is pre fixed at 5°C and is not  

adjustable.  

Power consumption:  

Temp. control range:  

Ambient temperature:  

Contact rating:  

It will only be activated when the thermostat is in the stand by mode and  

the room temperature reaches 5°C.  

7A 24Vac  

Dimensions:  

84 x 84 x 30mm  

Temperature sensor:  

Switching differential:  

Frost protection:  

NTC 10K Ohm @ 25°C  

Adjustable from 0.2/0.4/0.6/0.8/1.0˚C  

Only operational in stand by mode  

7. Button / Symbol description  

Heating ON symbol  

Room temperature  

3. Mounting  

The mounting height should be 1.5 meters above the floor level.  

Reset button  

Set point increase  

Set point decrease  

On / Standby button  

Set button  

The thermostat should be wall mounted in the room where the heating is to  

be controlled.  

The place of installation should be chosen so that the sensor can measure the  

room temperature as accurately as possible.  

Choose the mounting location to prevent direct exposure to sunlight or other  

heating / cooling sources when mounted.  

8. Resetting the thermostat  

The unit can be fitted to:  

1. Recessed conduit boxes  

2. Surface mounting boxes  

3. Directly on walls.  

It is necessary to reset the thermostat prior to initial use.  

Set  

Press and hold the  

button for 5 seconds.  

dEL will appear on the screen.  

RESET  

Press the  

button on the side of the thermostat.  

4. Installation  

OFF  

and  

Slacken the fastening screw on the bottom of the thermostat with a philips  

head screwdriver.  

9. Keypad lock and unlock  

To lock the keypad, press and hold the  

buttons for 5 seconds.  

The thermostat is hinged and can be opened 180 degrees.  

Mount the unit as described in section 3.  

will appear on the screen. The keypad is now locked.  

To unlock the keypad, press and hold the and buttons for 5 seconds.  

will disappear from the screen. The keypad is now unlocked.  

Wire the thermostat according to the wiring diagram.  

Close the thermostat and tighten the fastening screw.  

EPH Controls Ireland  

EPH Controls UK  

technical@ephcontrols.com www.ephcontrols.com  

technical@ephcontrols.com www.ephcontrols.co.uk  

20221006_CDT2-24-DS_Opins_PK  

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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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EPH CONTROLS CDT2-24 Room Thermostat Instruction Manual Overview

Summary of Contents

• Page 1: Operating instructions for CDT2-24 room thermostat with delay start include factory default settings, specifications and wiring, mounting, and installation. Caution: Disconnect the thermostat from the mains before any electrical work. Only qualified electricians or authorized service staff may open the thermostat. Frost protection is built into the thermostat, fixed at 5°C and not adjustable. The thermostat should be wall mounted at a height of 1.5 meters for accurate temperature measurement. Choose a mounting location away from direct sunlight or heating/cooling sources. Resetting the thermostat is necessary prior to initial use. To lock the keypad, press and hold the designated buttons for 5 seconds. Wire the thermostat according to the provided wiring diagram. The thermostat can be fitted to recessed conduit boxes, surface mounting boxes, or directly on walls. The unit can be opened 180 degrees for easy access.
• Page 2: Operating instructions for CDT2-24 room thermostat with delay start. High and low temperature limitation allows for setting upper and lower temperature limits. The thermostat activates when the temperature falls below the setpoint. To adjust high and low limit temperatures, specific button sequences must be followed. Delay start is an energy-saving mode that delays thermostat activation based on temperature conditions. The factory default switching differential is 0.4°C. Adjusting the setpoint temperature can be done using designated buttons. The thermostat has three modes: Normal On/Off, Delay Start, and Time Proportional Integral Mode (TPI). Delay start can be reactivated by specific actions related to temperature settings. The time delay for heating activation varies based on the temperature difference from the setpoint.
• Page 3: Operating instructions CDT2-24 room thermostat with delay start Time proportional integral mode (TPI) When the thermostat is in TPI mode, it will turn on and off to avoid overshooting or undershooting the setpoint. There are two settings that affect the thermostat's operation: the number of heating cycles per hour and the proportional bandwidth. The number of heating cycles per hour determines how often the thermostat cycles the heating on and off. You can select from 2, 3, 6, or 12 cycles per hour. The proportional bandwidth refers to the temperature below the setpoint at which the thermostat will start to operate in TPI control. You can set the proportional bandwidth from 1.5°C to 3.0°C in 0.1°C increments. An example shows the thermostat starting heating at a set time and switching off before reaching the temperature to allow natural increase.