Danfoss RET MD Guide de dépannage

RET MD

Electronic Intelligent Room Thermostat

User & Installation Guide

- Turn setting dial to required temperature which is displayed momentarily on the LCD display. The LCD reverts to

displaying actual room temperature within a few seconds.

- If Time Control is activated the green LED is lit.

- If the red LED is lit constantly, the heating is switched on.

- If the red LED is flashing, the Delay Start function is in operation.

- If the Save button is pressed while the heating is on, the Delay Start function will start. This can save energy by

switching the heating off once the room is up to temperature for the duration of the delay period (refer to Delay Chart

overleaf). Pressing the Save button a second time will return the thermostat to normal operation and the heating will

start.

- If the green LED is on, but the red LED is off, the room temperature has been reached and the thermostat is satis-

fied. If more heat is required turn the setting dial to increase the set temperature.

Green LED -

thermostat power on Red LED -

heating is operational

Temperature display LCD

Save Button

Setting Dial

RESET button

(behind dial)

Product specification

Power supply 230 V ac, ±10%, 50/60 Hz

Switching action 1 x SPDT volt free type 1B

Switch rating 3(1)A

Temperature range 5-30°C

Max. temperature 45°C

Dimensions, mm (W, H, D) 85 x 86 x 42

Design standard EN 60730-2-9

Control pollution Degree 2

Rated impulse voltage 2.5Kv

Ball hardness 75°C

Installation Instructions

Product overview

The RET MD is an intelligent room thermostat that, when used in

conjunctionwithaprogrammerortimeswitch,providesanenergysaving

time delay between programmed switch-on and the actual start of the

heating system. The duration of the delay is dependent upon how

close to set-point the ambient room temperature already is.

Installation

1. The product should only be installed by a qualified electrician or

competent heating installer. The installation must be in accordance

with the current edition of the IEEE wiring regulations.

2. The thermostat must be located at a height of 1.5 metres out of

direct sunlight, away from other heat sources and out of draughts.

3. There must be clearances of at least 30mm right, left and above,

and 100mm below in order to mount the plug-on module.

4. The wallplate must be securely mounted either directly to the wall,

using suitable wood screws, or to a flush mounted 1-gang electrical

accessory box using M3.5 screws.

5. Cable access can either be from behind for concealed cabling or

from below for surface cabling. If surface cable is used, cut out cable

access slot on plug-on module prior to mounting the module.

6. For wiring connections refer to Diagram 1 below. All models are

double insulated and do not require an earth connection. Howevera

parking terminal is provided on the wallplate, which is clearly marked

with an Earth symbol.

7. Prior to mounting the plug-on module, DIL switches on the rear of

the plug-on module must be set. See Diagram 2 below for available

options.

8. Mount plug-on module to wallplate by locating tabs on top of

wallplate in apertures on rear of module, hinge down and press firmly

to wallplate before tightening securing screws on bottom of wallplate.

Diagram 1. - Wiring

Diagram 2. - DIL Switch Settings

No Heating

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Fault Check List

Delay

Start

Enabled

Chrono

Chrono 3

0°C

Delay

Start

Disabled

On/Off

Chrono 6

0°F

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0

Temperature below thermostat setting, °K

Time delay after time control switch-on,minutes

Delay Start Chart

This product complies with the following EC Directives

Electro-Magnetic Compatibility Directive.

(EMC) (89\336\EEC), (92\31\EEC)

Low Voltage Directive.

(LVD) (73\23\EEC), (93\68\EEC)

Danfoss Randall Ltd

Ampthill Road, Bedford, MK42 9ER

Tel: 01234 364621

Fax:01234219705

Email:[email protected]

Website:www.danfoss-randall.co.uk

Part No 25698 Iss 3 06/04

RET MD

Note: For RET MD live supply is from the Time Control output

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