EPH Controls CDT2-24 Operating Instructions Manual

Page 1 of 2

CDT2-24 Room Thermostat Hardwired

Contents

1. Factory default settings

2. Specication & wiring

3. Mounting

4. Installation

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 dierential

12. Adjusting the setpoint temperature

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: °C Switching dierential: 0.4°C In built frost protection: 5°C High and Low temp. limitation: O Blue backlight activated : for 10 secs after any button is pressed Keypad lock: O

Operating Instructions

CAUTION!

Before commencing any work on the electrical

connections, you must rst 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 qualied electricians or authorised service sta are permitted to open the thermostat.

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.)

Impor tant: Kee p this document

INTERNAL WIRING DIAGRAM CDT2-24

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

321LN

ON OFFCOM

24Vac

SUPPLY

2. Specications & wiring

Power supply: 24Vac 50Hz Power consumption: 8 VA Temp. control range: 5 ... 35°C Ambient temperature: 0 ... 50°C Contact rating: 7A 24Vac Dimensions: 84 x 84 x 30mm Temperature sensor: NTC 10K Ohm @ 25°C Switching dierential: Adjustable from 0.2/0.4/0.6/0.8/1.0˚C Frost protection: Only operational in stand by mode

3. Mounting

The mounting height should be 1.5 meters above the oor level. 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. The unit can be tted to: 1. Recessed conduit boxes

2. Surface mounting boxes

3. Directly on walls.

4. Installation

Slacken the fastening screw on the bottom of the thermostat with a philips head screwdriver.

The thermostat is hinged and can be opened 180 degrees.

Mount the unit as described in section 3.

Wire the thermostat according to the wiring diagram. Close the thermostat and tighten the fastening screw.

6. Frost protection

Frost protection is built into this thermostat, it is pre xed at 5°C and is not adjustable.

It will only be activated when the thermostat is in the stand by mode and the room temperature reaches 5°C.

5°C

7. Button / Symbol description

Heating ON symbol

Room temperature

Reset button

On / Standby button

Set button

Set point increase Set point decrease

8. Resetting the thermostat

It is necessary to reset the thermostat prior to initial use. Press and hold the button for 5 seconds. dEL will appear on the screen. Press the button on the side of the thermostat.

9. Keypad lock and unlock

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

Set

RESET

OFF

EPH Controls Ireland

Sitecast Industrial Estate, Pouladu, Cork, T12 W665, Ireland

sales@ephcontrols.com www.ephcontrols.com

20170308_AW1077_CDT2-24_OpIns_JW

EPH Controls UK

Unit E4, Welland Business Park, Valley Way, Market Harborough, Leicestershire, LE16 7PS, United Kingdom

sales@ephcontrols.co.uk www.ephcontrols.co.uk

Page 2 of 2

CDT2-24 Room Thermostat Hardwired

10. High and Low temperature limitation

An upper and lower temperature limit may be chosen. 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 conrm 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. Press the button and the thermostat is ready for operation. “Limit” will appear on the screen.

To deactivate High and Low temperature limitation.

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. Press the button and the thermostat is ready for operation.

Set

11. Adjusting the switching dierential

Press the button once, Di set will appear on the screen. The factory default switching dierential of 0.4C will appear on the screen. Press the and buttons to select the desired dierential from 0.2 - 1˚C. Press the button to return to normal operation.

Set

OFF