OJ ELECTRONICS UDG Programmable Thermostat
The thermostat is an electronic on/off thermostat for temperature control of electric underfloor heating by means of an NTC sensor located either externally or internally within the thermostat. The thermostat has a built-in twopole ground fault circuit interrupter (GFCI, Class A). The thermostat and GFCI are suitable for 120-240 V (incl. 208 V) 50/60 Hz power supplies. The thermostat is for flush mounts in a wall socket.
Product program
Thermostats with built-in GFCI
- UCG-4991 Programmable thermostat incl. floor sensor
- UDG-4999 Programmable thermostat with 2 sensors: floor sensor and built-in room sensor
- UTN-4991 Non-programmable thermostat incl. floor sensor
Power module with built-in GFCI
USG-4000 Power module without sensor
Mounting of floor sensor
The floor sensor is supplied by SELV (Safety Extra-low Voltage) Circuit, allowing the sensor to be placed as close to the floor surface as desired without having to take special account to the risk of shock at the damage to the sensor cable. It is not intended that the temperature sensor wire shall enter through the wall socket mounting box. The sensor cable shall be seperated from LINE and LOAD cables. Can be separated in conduit, inside or outside the wall. (see Fig. 7)
Recommended placed in an nonconductive installation pipe, which is embedded in the floor. (fig. 3). The pipe must be sealed in the end and placed as high as possible in the concrete layer. The sensor cable shall be placed in a separate pipe or be separated from power cables. The floor sensor must be centered in between the heating cable. The sensor cable can be extended up to 90 ft (30 m) by means of a separate two-core cable. Two remaining cores of a multi-core cable which, for example, supplies current to the floor heating wires, must not be used. The two-core cable must be placed in a separate pipe or be separated from the power cables. Other approved floor sensors may be used if they comply with the technical specifications (see Fig. 5).
Mounting of thermostat with built-in sensor (UDG-4999)
The room sensor is used for comfort temperature regulation in rooms. The thermostat should be mounted on the wall approx. 5.4 ft (1.6 m) above the floor in such a way as to allow free air circulation around it. Draughts and direct sunlight or other heat sources must be avoided.
Installation
TO AVOID ELECTRIC SHOCK, DISCONNECT THE HEATING SYSTEM POWER SUPPLY AT THE MAIN PANEL BEFORE INSTALLING THE THERMOSTAT. KEEP THERMOSTAT AIR VENTS CLEAN AND FREE FROM OBSTRUCTION. This thermostat is an electrical product and must be installed in compliance with the National and/or Local Electrical Code. Installation must be performed by qualified personnel where required by law. The thermostat is equipped with a ground fault circuit interrupter (GFCI, Class A) which requires that the line and load cables are isolated from one another for correct operation. The thermostat is designed for resistive load only. The resistive load must not exceed 15 A (1800 W at 120 Vac / 3120 W at 208 Vac / 3600 W at 240 Vac). During a ground fault, the two lines will be cut off.
Line cable
Delivers power from the service panel (breaker panel or fuse box) to the thermostat. This cable must only be connected to the thermostat’s line terminals, marked L1 and L2. Connect power cable to terminals 2 and 3 on the back of the thermostat (fig. 2).
Load cable
Delivers power from the thermostat to the heating cable. This cable must only be connected to the thermostat’s load terminals, marked load 15 A. Connect heating cable to terminals 1 and 4 on the back of the thermostat (fig. 2).
The detachable cover on the back of the thermostat (fig. 1) is designed to prevent uninsulated ground wires from dropping onto the terminals after installation has been completed.
Warning
Do not loosen the terminal screws further than the mechanical stop. Otherwise this will damage the terminal
Temperature sensor
- Use a screwdriver to release the catch and remove the front cover (fig. 1).
- Connect the floor sensor to the terminals marked “sensor”, terminals C and D (fig. 6).
- Mount the thermostat in the wall socket.
- Carefully replace the front cover by first positioning its upper edge and then clicking it into place.
Power module, type USG
If loads of more than 15 A are required, expansion is possible using power modules. Power modules can be connected to the live cable and load cable, see relevant sections. Maximum distance between thermostat and power modules is 80 ft (25 m.) Use field wiring cable, recommended min. 20 AWG. Connect A to C and B to D (fig. 6).
Operation
Types UCG and UDG (with built-in clock): The first time the thermostat is connected, time and day must be set. The thermostat will automatically start up in the menu for setting time and day.
Type UTN (without built-in clock):
The actual temperature setting is shown and the thermostat is ready for use.
Checking the GFCI
It is important that the GFCI is checked for correct installation and function upon installation and monthly thereafter. To check the GFCI: Press the “TEST” button. The test is successful if the red LED on the right of the thermostat flashes once every two seconds and “GROUND FAULT” appears on the display. If this does not occur, check the installation. Press the “Standby/Reset” button to reset the GFCI. The red LED will stop flashing and the display returns to its normal appearance. If the test fails, repeat the test. If it continues to fail, ask an electrician to check the installation. If, during normal operation, the GFCI trips without the “TEST” button being pressed, there could be a ground fault! To check whether it is a ground fault or nuisance tripping, press “Standby/Reset”. If this causes the red LED to stop flashing and stay off, it was nuisance tripping and the system is operating correctly. If this does not occur, there is a ground fault! In case of a ground fault, it is important to have the installation checked by a qualified electrician according to local and national regulations. The red LED on the right of the thermostat can indicate four different GFCI states:
- LED off – NORMAL state.
- LED flashing slowly (once every two seconds) – TRIGGERED state. Try pressing the “Standby/ Reset” button to reset the GFCI.
- LED flashing quickly (five flashes per second) – ERROR state. Try switching the power off and then back on again. If the thermostat re-enters the ERROR state, either the wiring is wrong (a GN exists) or the unit is defective and must be replaced.
- LED lit constantly – Internal microprocessor malfunction or abnormal fault in hardware! Try switching the thermostat off and then back on again. If the LED is still constantly lit, the GFCI is defective and the thermostat must be replaced.
Note: The LED lights up briefly without flashing during every power-up.
Programming
See user manual.
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REFERENCE:
DOWNLOAD MANUALS:
OJ ELECTRONICS UDG Programmable Thermostat Instruction Manual
OTHER MANUALS:
OJ ELECTRONICS UDG Programmable Thermostat Quick Start Guide
OJ ELECTRONICS UDG Programmable Thermostat Instruction Manual
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