EPH Controls CRT2 Operating Instructions Manual

Page 1 of 2

CRT2 Room Thermostat Battery Operated

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. Replacing the batteries

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

5. Wiring diagram

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

INTERNAL WIRING DIAGRAM CRT2

321

ON OFFCOM

2. Specications & wiring

Power supply: 2xAA Alkaline Battery
Power consumption: 2mW
Battery replacement: Once per year
Temp. control range: 5 ... 35°C
Ambient temperature: 0 ... 50°C
Contact rating: 8A 250Vac
Dimensions: 84 x 84 x 30mm
Temperature sensor: NTC 10K Ohm @ 25°C
Temperature indication: ˚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.

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 programming.

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

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.

EPH Controls Ireland

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

[e-mail] www.ephcontrols.com

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.

OFF

EPH Controls UK

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

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

20170301_AW1077_CRT2_OpIns_JW

Page 2 of 2

CRT2 Room Thermostat Battery Operated

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

will appear on the screen.

OFF

Use the button to select .

Press the button to select high limit.

Set

Press the and buttons to select high limit temperature.

Press the button to select low limit.

Press the and buttons to select low limit temperature.

Press the button and the thermostat is ready for operation.

Set

Set

Limit will appear on the screen.

To deactivate High and Low temperature limitation.

Press and hold the and buttons for 10 seconds.

Limit

will appear on the screen.

ON

Use the button to deactivate this function.

Limit

will appear on the screen.

OFF

Press the button and the thermostat is ready for operation.

Set

Set

Limit

ON

Set

OFF

Operating Instructions

11. Replacing the batteries

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.

Replace the batteries with 2 x AA Alkaline batteries.

Close the thermostat and tighten the fastening screw.

EPH Controls Ireland

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

[e-mail] www.ephcontrols.com

20170301_AW1077_CRT2_OpIns_JW

EPH Controls UK

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

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