INSTRUCTIONS

Product Overview

Electronic thermostat with Elko/Eljo ram for mounting in standard wall box. The thermostat is adjustable to required temperature from +5/+35°C. The LED shows that the heat is ON.

Including:

• Floor sensor
• Loose base plate Elko
• Mounted with Eljo frame and base plate

CE MARKING

OJ Electronics A/S declare under their own responsibility that this product meets the requirements of the European Council's directive 89/336 and successive modifications as to electro-magnetic compatibility and the Council directive 73/23 as to electrical equipment to be applied within certain voltage ranges.

Standards applied

• EN 61000-6-3, EN 61000-6-2, EN 60 730-1 and EN 60730-2-9.

The product may only be energised when the entire installation meets the current directive requirements.

When the product is installed according to this instructions guide and the current installation guidelines, it is covered by factory guarantee.

If the product has been exposed to damage e.g. in transport, it must be checked and overhauled by qualified staff before the product is connected to the power.

TECHNICAL DATA

The thermostat is free of maintenance.

CLASSIFICATION

The product is a class II device (reinforced insulation) and the product must be connected to the following conductors:

• 1) Phase (F/L2)
• 2) Neutral (N/L1)
• PE Earth

MOUNTING OF SENSOR

Floor sensor: Placed in installation pipe which is embedded in floor. The pipe is thickened in the end and placed as high as possible in the concrete layer.

Sensor cable may be extended up to 50 m with separate cable for power current. Two conductors in a multiconducting cable, which e.g. is used for supply of heating cable, may not be used. Voltage signals, which may disturb the function of the thermostat, may occur. If the cable is used with screen, the screen may not be connected to the ground, but must be connected to terminal 6.

The best installation is attained with a separate cable for the sensor, which is then mounted in a separate conduit.

OTC contains a sensor control which interrupts the heating in case of disconnected or short-circuited sensors. Scheme with sensor values (fig. 4).

MOUNTING OF THERMOSTAT

Standard Wall Box Mounting (fig. 1 and 3)

1. Remove the control knob (A) carefully with a screwdriver.
2. Screw (B) should be unscrewed and the cover lifted off.
3. Electrical connections can be made as shown in the wiring diagram (fig. 3).
4. The thermostat can now be fitted into the wall box.
5. Frame and cover is mounted.
6. Thermostat knob (A) is replaced.

Mounting in Elko Frame (fig. 1, 2 and 3)

If the thermostat is to be mounted in an Elko frame, the enclosed Elko housing is to be used.

1. Remove the control knob (A) carefully with a screwdriver.
2. The Eljo housing is removed by loosening the screw (B). Press out the lens (D) (press from the backside of the housing) and mount in reverse order into the Elko housing.
3. Electrical connections can be made as shown in the wiring diagram (fig. 3).
4. The thermostat can now be fitted into the wall box.
5. Thermostat knob (A) is replaced.

If a min./max. limitation of the temperature setting is required, the blue and red locking rings and the locking mechanism (C) from the Eljo housing can be used. See also the section MAX./MIN. TEMPERATURE.

TEMPERATURE SETTING

OTC-1991 has a scale range of +5/+35°C. To assist the adjustment, the thermostat has a LED which will glow RED when the heating is ON. The thermostat should be set to maximum temperature setting until the desired temperature of the room or floor is achieved. The control knob should then be turned back until the LED goes out. Fine adjustments can be made over the next 1/2 days to suit individual requirements.

THERMOSTAT ADJUSTMENT

When the room temperature has been stabilized, the thermostat set position may be adjusted to match actual room temperature. Measure the temperature of the room with an accurate thermometer. Remove control knob and reposition it so that the indicated temperature line shows the same as the measured temperature. This adjustment can be done in steps of 3°C.

MAX./MIN. TEMPERATURE (fig. 1)

A locking mechanism is positioned behind the control knob to limit the amount of adjustment possible. By loosening the little screw (C), the scale range can be locked, e.g. between 20°C and 25°C. The red ring indicates the maximum temperature and the blue ring indicates the minimum temperature.

FIGURES

Fig. 1

Thermostat cover with control knob (A), screw (B) for cover removal, and locking mechanism (C) with red (max) and blue (min) rings.

Fig. 2

Eljo housing.

Fig. 3

Wiring diagram showing connections for 230V AC (L/F, N) and PE (Earth). Terminals 1-6 are labeled. Indicates MAX 3220W, 14A.

Fig. 4

Table titled "Sensor" with columns "Temp.(°C)" and "Value (ohm)". Entries: -10°C (64000 ohm), 0°C (38000 ohm), 10°C (23300 ohm), 20°C (14800 ohm), 30°C (9700 ohm).