Eph controls CDT2 User Manual

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CDT2 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. Adjusting the setpoint temperature

10. Keypad lock and unlock

11. High and Low temperature limitation

12. Adjusting the switching dierential

Prior to setting the thermostat, it is neccessary to
complete all required settings described in this section.

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

2. Specications & wiring

Power supply: 230Vac 50Hz
Power consumption: 8 VA
Temp. control range: 5 ... 35°C
Ambient temperature: 0 ... 50°C
Contact rating: 8A 230Vac
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

Operating Instructions

CAUTION!

Before commencing any work on the electrical

connections, you must rst disconnect the thermostat
from the mains. None of the 230V 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

5. Wiring diagram

INTERNAL WIRING DIAGRAM CDT2

If mains voltage output is required, terminals L & 2 must be electrically linked.

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.

7. Button / Symbol description

Room temperature

321LN

ON OFFCOM

5°C

MAINS

SUPPLY

Heating ON symbol

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.

On / Standby button

Set button

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.

Set

RESET

9. Adjusting the setpoint temperature

Press the or buttons to adjust the temperature setpoint.

Reset button
Set point increase
Set point decrease

EPH Controls Ireland

[e-mail] www.ephcontrols.com

EPH Controls UK

[e-mail] www.ephcontrols.co.uk

20180116__CDT2-Hardwired_OpIns_JW

Page 2 of 2

CDT2 Room Thermostat Hardwired

10. 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.

11. 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

Set

Set

Set

OFF

OFF

Operating Instructions

12. 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

0.4˚C

EPH Controls Ireland

[e-mail] www.ephcontrols.com

EPH Controls UK

[e-mail] www.ephcontrols.co.uk

20180116__CDT2-Hardwired_OpIns_JW