COZISTAT INSTALLATION I NSTRUCTIONS &OPERATING MANUAL CoziStat 1. Introduction and Brief Description The CoziStat is an easy-to-use, programmable thermostat with digital display. CoziStat can be used with CoziMat and CoziFloor Underfloor Heating Systems by Thermotex. The thermostat can be programmed to automatically maintain the preset floor or room temperature or alternatively can be controlled manually - and provides economic use of electricity by energizing the underfloor heater only as required. For full technical characteristics of the CoziStat thermostat, please see the Technical Specification, which is available from www.thermotex-direct.co.uk. IMPORTANT: Please read these installation instructions carefully before attempting to install the CoziStat thermostat. Incorrect installation may cause damage to the product. All electrical connections and connection to the mains supply must be carried out by a qualified electrician. The power supply should be isolated.
2. Overview Guide to Buttons and Symbols Day Room or Floor Temperature Set Temperature Heating Programmable Mode Time Period Manual Mode Lock Time Set Time Down Mode Power Up
C O Z I S T A T I N S T A L L A T I O N I N S T R U C T I O N S & O P E R A T I N G M A N U A L 3. What You Will Require for Installation: In the box; CoziStat Digital Thermostat External Floor Sensor Sold Separately; Underfloor Heating System, such as CoziMat or CoziFloor 35-40mm Electrical Back Box 30mA RCD (residual current device) Cable trunking (for power and sensor cables in the wall) Flexible conduit (for sensor cables in the floor) Waterproof Tape (to seal the open end of the conduit in the floor) Installation Instructions (available to download at www.thermotex-direct.co.uk) 4. IMPORTANT DO NOT: Do not load a single thermostat with more than 16A (i.e. 26sq.m of CoziMat or 100m of CoziFloor heating cable) Do not position a thermostat in Bathroom Zones 0-2 (consult the latest IET Wiring Regulations or a qualified electrician) DO: Do read these installation instructions carefully before attempting to install your CoziStat thermostat Do protect the delicate sensor wire from damage during and after installation 5. Electrical Safety During Installation All mains electrical connections must be undertaken by a certified electrician and must conform to current IEE Wiring Regulations You must use a floor sensor thermostat, such as CoziStat, to control the CoziMat underfloor heating system at all times Use a 30mA residual current device for maximum safety 6. Positioning the Thermostat Position the thermostat conveniently on the wall - preferably near an existing power source to avoid the need for additional wiring. Always protect the heating circuits with a suitably rated fuse and a 30 ma residual current device. In accordance with BS 7671: 2008 IET 17th Edition Wiring Regulations, thermostats must not be positioned within Zones 0-2, which are considered the wettest areas. Please refer to the current IET Regulations or a qualified electrician to ensure that you are guided by the latest regulations and code of practice. If the room is big enough to incorporate an Outside Zone (an area outside of zones 0-2, where water jets are not used for cleaning purposes), the thermostat can be positioned here. Otherwise the thermostat must be positioned outside of the room, away from wet conditions.
7. Installation 1. Prepare the position on the wall for the thermostat. 2. Channel out grooves in the wall for the cable trunking for the power supply wires, underfloor heating cable / connection cable, and the floor temperature sensor. 3. Channel out a groove in the floor for the flexible conduit, which will be used to protect the floor sensor. The bulb end of the floor sensor should be positioned centrally to two runs of heater cable in the floor. 4. Seal the end of the flexible conduit which will be installed in the floor with tape to ensure the sensor stays clean and dry. 5. Install the electrical back box for the thermostat, the cable trunking in the wall and the flexible conduit in the floor. If you are installing more than two heaters, a junction box will also be required. 6. Use the screws provided to fix the back plate of the thermostat to the electrical back box. 7. Connect the Thermostat display unit to power and the sensor according to the wiring diagram (See Section 8). Install the sensor in position in the conduit in the floor. 8. Clip the Thermostat display unit to the back plate. 9. You're ready to go! 8. Wiring Optional facility to use RS485 interface to relay to a BMS system. RS485- (Optional) RS485+ (Optional) L N Load Sensor
9. Operation Manual SETTING UP PROGRAMMABLE MODE To set up Programmable Mode first press and hold for approximately 3 seconds. The screen will light up and the time will flash in the bottom right corner. You will also see all the weekdays displayed across the top of the screen and the Period 1 house symbol showing in the bottom left. To programme Period 1 (the morning switch on time) use the and arrow keys to adjust the time (in 15 minutes intervals). Next, press to select the Set Temperature and again use the arrow keys to adjust the desired temperature up or down. Then, press again to move to Period 2 and programme as before first selecting the time and then the temperature. Select up to 6 weekday time periods. POWER ON/OFF Press once to switch the thermostat on. The display will activate and light up blue. After approximately 10 seconds of inactivity the screen backlight will switch off. Press once again to switch off. SETTING THE TIME To set the time and day of the week, first press. The minutes shown on the time display in the lower right corner of the screen have been selected and will be flashing. Adjust the minutes up or down using the and arrow buttons. Press again to select the hours, and then press once more to select the days, adjusting with the arrow buttons. Once you have selected the Set Temperature for time period 6, press to move to setting the weekend programme. The weekend days will now appear in the top right of the screen and you can programme the times and temperatures as you did for the weekdays. Finally, press once again to exit the Programmable Mode setup. TO LOCK OR UNLOCK THE PANEL To lock or unlock the thermostat panel, press and hold both the up and down arrow buttons at the same time for approximately 5 seconds. When locking, the symbol will appear to show the panel is locked and the buttons will become inactive. When unlocking, the symbol will disappear to show the panel is unlocked and the buttons will become active. CHANGING THE OPERATION MODE Press to switch between Manual and Programmable Modes. When shows Manual Mode is selected. When shows, Programmable Mode is selected. ADJUSTING THE TEMPERATURE IN MANUAL MODE With Manual Mode selected ( showing on the screen), simply use the and arrow buttons to adjust the set (desired) temperature up or down. The Set Temperature shown on the right side of the display will adjust accordingly.
10.Advanced Settings 3. Sensor Type Options: In, Ou, AL 'In' refers to the internal sensor in the thermostat. This measures the room (air) temperature only, not the floor temperature. 'Ou' refers to the external sensor installed in the floor. This measures the floor temperature only, not the air temperature. 'AL' refers to the internal sensor measuring the room (air) temperature and the external sensor used to limited the floor temperature. Using CoziStat to control underfloor heating, we recommend you use the external sensor at all times. To do this ensure the Display reads '03 Ou'. 4. Low Temperature Protection Options: 5, 6, 7, 8, 9, 10, - - Switch the CoziStat Display OFF. Press and hold both the and buttons at the same time for approximately 3 seconds to enter the Advanced Settings Menu. The display should read '01-1'. Press to change between the Menu Option number on the left of the display, and use the up and down arrow keys to switch between the options on the right of the display. See below for explanations of the Menu Options. 1. Temperature Compensation in internal sensor Ensure the Display reads '01-1' 2. Deadzone Temperature / Switching Tolerance Options: 01, 02, 03, 04, 05 '01' means that the tolerance will be set to 1 o C ('02' means that the tolerance will be set to 2 o C, and so on). A 1 o C tolerance means that the thermostat will switch the heater ON when the Room Temperature falls 1 o C or more below the Set Temperature. Similarly, the thermostat will switch the heater OFF when the Room Temperature rises 1 o C or more above the Set Temperature. A 2 o C tolerance means that the thermostat will switch the heater ON when the Room Temperature falls 2 o C or more below the Set Temperature. Similarly, the thermostat will switch the heater OFF when the Room Temperature rises 2 o C or more above the Set Temperature. We recommend setting the tolerance at '01'. To do this ensure the Display reads '02 01'. '5' means that low temperature protction is set to 5 o C. If the Room Temperature drops below 5 o C the thermostat will switch the heating ON to maintain a minimum of 5 o C. This Low Temperature Protection Setting can be set to switch the thermostat ON between 5 o C and 10 o C. Select '- -' to cancel the Low Temperature Protection Setting. 5. High Temperature Protection Options: 35-70*, - - *DO NOT SET THE HIGH TEMPERATURE PROTECTION SETTING HIGHER THAN 45 (45 O C) '35' means that high temperature protction is set to 35 o C. If the Temperature reading rises above 35 o C the thermostat will switch the heating OFF to maintain a maximum of 35 o C. Use this High Temperature Protection Setting to switch the thermostat OFF between 35 o C and 45 o C. 6. Button Locking Ensure the Display reads '06 0' 7. Weekend Setting Options: 2 day weekend, 1 day weekend, no weekend 'MON TUES WED THURS FRI' displayed across the top of the screen means a 2 day weekend is selected. 'MON TUES WED THURS FRI SAT' displayed across the top of the screen means a 1 day weekend is selected. 'MON TUES WED THURS FRI SAT SUN' displayed across the top of the screen means no weekend is selected (i.e. one heating programme which is the same every day)