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Control ‐ Thermostats
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Control ‐ Thermostats 2
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Ottostat including terminal box unit Technical Data
Temperature range . Fixed nonadjustable set point +3°C, .............................................................power off at +5°C Rated voltage .......................................................... 220V Breaking capacity ....................................................... 5A Contact function ................................................ breaking Visual indication ................................. LED indicator (red) Mounting ......................................... screwed to the wall Enclosure ........................................ IP54 (transparent lid)
Wiring diagram
Part .No... ......................................................... 85 800 53
Range of application Junction box for self‐limiting, parallel resistive or return wire cables. This box is designed mainly for the connection of smaller frost protection installations. 5 amperes maximum in for example pipes, worksheds etc.
Dimensions
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Control ‐ Thermostats 3
Ottostat
Ottostat
Technical data
Break temperature ............................. On +1°C ‐ Off +3°C ............................................................ On +1°C ‐ Off +5°C Rated voltage ........................................................... 220V Breaking capacity ........................................................ 5A Contact function ................................................ breaking Mounting ................................................................ PG16 Part. No. .......................................... 30492 Ottostat +3°C Part. No. ............................ 85 800 52 Ottostat +5°C IP55
Range of application Ambient air sensing bimetal thermostat for use in pipe frost protection systems. It can also be used as an outdoor thermostat to control contactors in frost protection and snow melting applications involving underground heating. At +1°C the thermostat switches power on. At +3°C and +5°C respectively the thermostat switches power off.
Dimensions
Control ‐ Thermostats 4
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Capillary tube thermostat CO4C Technical data
Temperature range ...................................... ‐35.... +35°C Temperature differential. .......................................... 2°C Breaking capacity ............................................. 16A/250V Contact function ...............................................switching Capillary tube length ................................................ 1.5m Enclosure Class .......................................................... IP55 Connection ............................. AMP male plug (supplied) Part. No.. .......................................................... 85 800 54
Range of application This thermostat may well be used for controlling individual heating cables installed for frost protection of pipes in industrial and other buildings and in homes. It is to be mounted next to the junction box into which heating cable is connected. When used as a floor thermostat the sensor is installed in a 22.5mm VP‐pipe.
Wiring diagram
Dimensions
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Control ‐ Thermostats 5
Elektronic floor thermostat ROOMSTAT 110 Characteristics
This thermostat can be considered as a classical decision for your comfort. The thermostat is supplied with the light indication of the heating system «on» state, temperature fine adjustment knob and the dial of conventional values of assigned temperature. Up‐to‐date technologies are used in the thermostats manufacturing that excludes the possibility of defect appearance, that means reliability. The thermostat is an energy saving device, it automatically turns the heating system on and off reacting upon the thermosensor signals. That allows to consume the electric energy precisely as much as it is necessary to maintain the preset temperature in the premise.
Technical specification Supply voltage ............................................... 230V~50Hz Max. load current ...................................................... 16A Power consumption ........................................... 500 mW Weight: .................................................................. 150 gr Dimension: ................................................ 80x80x52 mm Ingress protection level ............................................ IP20 Floor sensor .............................................. NTC 6.8 kOhm Maintenance temperature ................... from +5 to +45°C Allowable ambient temperature .......... from +5 to +40°C Tolerance: ................................................................... 1°C Fits ELJO Trend polarvi
Control ‐ Thermostats 6
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Electronical floor thermostat I‐WARM 710 Characteristics
Room thermostat has 2 temperature sensors: remote floor temperature sensor and built‐in air temperature sensor. It is flush mounted. This thermostat is designed for constant maintenance of the preset temperature using floor temperature sensor. This model has the following features: Large‐screen backlit graphical display, 3 control buttons. User‐friendly «intuitive» «one‐touch» interface. Indication of current floor temperature, set temperature, ON/OFF heater condition. Self‐diagnostics of heating system with warning caption output. An additional mode allows to display ambient air temperature (at that temperature control is still based on floor temperature sensor, this option only makes it possible to use the device as room thermometer with digital indication). Service mode is realized for manual heating control not using sensors; at that the user sets the percentage (10‐90%) of time when heating is ON during each hour.
Technical specification Voltage .......................................................... 230V~ 50Hz Max. load current ...................................................... 16 A Power consumption ........................................... 450 mW Weight .................................................................... 150 gr Dimension ................................................ 80Х80Х52 mm Time of storage preset data at disconnected supply network ............................................................ unlimited Ingress protection level............................................ IP 20 Floor sensor .............................................. NTC 6.8 kOhm Length of sensor cable ............................................... 2 m Built‐in air temperature sensor ................. NTC 6.8 kOhm Maintenance temperature ............. from +5 ˚C to+45 ˚C, ............................................ Factory preset value: +25 ˚C Ambient temperature .......................... from +5 to +40 ˚C Tolerance ................................................................... 1˚C Fit ELJO Trend Can be obtained in other colours on order . white, black, ........................................ gold, silver, champagne, beige
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Control ‐ Thermostats 7
Electronical floor thermostat I‐WARM 720
Characteristics
Room thermostat with remote floor temperature sensor. The device allows to decrease significantly energy consumption of warm floor by maintaining comfort temperature only in the preset time intervals when it is really required by the customer. Large‐screen backlit graphical display, 3 control buttons. User‐friendly «intuitive» «one‐touch» interface. The built‐in menu allows to control all functions of the device. Flush mounting. Multimode thermostat with built‐in real‐time block and calendar. Built‐in economizer. The device stores and keeps in memory all the information about the heating system that allows customer to control his expenditures not to the expense of comfort. «Intelligent» software allows to determine parameters of heat processes in the premise. The user can only settle time intervals when he needs heating and the device makes the rest by itself. The additional display features: clock, calendar.
Technical specification Voltage .......................................................... 230V~ 50Hz Max. load current ..................................................... 16 A Power consumption ........................................... 450 mW Weight ................................................................... 150 gr Dimensions ............................................... 80Х80Х52 mm Time of storage preset data at disconnected supply network........................................................... 12 months Ingress protection level ........................................... IP 20 Floor sensor .............................................. NTC 6.8 kOhm Length of sensor cable ............................................... 2 m Built‐in air temperature sensor ................ NTC 6.8 kOhm Maintenance temperature .................. from +5 to +45˚C, .............................................. factory preset value: +25˚C Ambient temperature .......................... from +5 to +40 ˚C Tolerance ................................................................... 1 ˚C Fits ELJO Trend polar vhite Frame color white, black, gold, silver, champagne, beige
The following temperature maintenance modes can be realized: • CONSTANT comfort temperature maintenance; • DAILY comfort temperature maintenance schedule. At that daily cycle of comfort temperature distribution is realized. The user sets time intervals of the day when he requires warm floor. The device adjusts itself to the premise: determines the existing heat properties and defines by itself the time when the heating system should «turn ON» to obtain the comfort temperature exactly at the set time. All the rest time — the heating system is turned OFF saving the energy. This program repeats on a daily basis, till you modify the schedule or choose another mode. • WEEKLY comfort temperature maintenance schedule. The weekly temperature distribution cycle. It is similar to «daily» option; but you programme seven days independently and this cycle repeats each week.
Control ‐ Thermostats 8
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Electronical floor thermostat I‐WARM 730
Characteristics
Room thermostat with 2 remote floor temperature sensors and two zones control opportunity. It is flush mounted. This model maintains the set temperature in accordance with the floor temperature sensor. This model has the following features: Large‐screen backlit graphical display, 3 control buttons. User‐friendly «intuitive» «one‐touch» interface. Indication of current floor temperature, set temperature, ON/OFF heater condition. Self‐diagnostics of heating system with warning caption output. Service mode is realized for manual heating control not using sensors; at that the user sets the percentage (10 to 90%) of time when heating is ON during each hour. Ensures up to 70% of energy saving.
Technical specification Voltage .......................................................... 230V~ 50Hz Max. load current ................................................... 2Х8 A Power consumption ......................................... 1350 mW Weight .................................................................... 200 gr Dimension .............................................. 116Х82Х54 mm Time of storage preset data at disconnected supply network ............................................................ unlimited Ingress protection level............................................ IP 20 Floor sensor .............................................. NTC 6.8 kOhm Length of sensor cable ............................................... 2 m Built‐in air temperature sensor ................. NTC 6.8 kOhm Maintenance temperature ................. from +5 to +45˚C, ............................................. factory preset value: +25˚C Ambient temperature .......................... from +5 to +40 ˚C Tolerance .................................................................. 1 ˚C Frame color white, black, gold, silver, champagne, beige
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Control ‐ Thermostats 9
Termonic 16090
• Electronic thermostat • Switchable between tree temperature ranges. • Adjustable switching differential 1‐10°K • Sensor monitoring • SEMKO approved Technical data Temperature range ‐15° to +95°C (temperature range 2)
Rated voltage ........................................... 230V 50/60 Hz
Wiring diagram/Dimensions
Ambient temperature ................................. ‐10° to +55°C Max. breaking current ..................................... 10A/250V Relay ............................................... 1 VX (potential free) Relay indication .............................................. yellow LED Switching differential Internal setting ..................................................... 1‐10°K Electrical service life ...........................................1 x 10E5 Electrical connection ................ screw terminal, 2.5mm² Temperature setting ................................................ knob Sensor PTC .............................................. PVC 3m (100m) Enclosure ................................................... PVC RAL 7035 Enclusure Class ........................................................ IP 54 Prepackaged .............. thermostat complete with sensor Mounting ............................................. Surface mounted
Range of application Control of heating cable applications, refrigeration and air conditioning plants, frost protection monitoring. For indoor or outdoor mounting. IP 54.
Characteristics An electronic thermostat for universal use, using a modern surface mounting technique. Wide temperature range. Adjustable switching differential for high loads and harsh industrial environments. Sensor monitoring using LED indication of failure or short‐circuited sensor. Sensor of the PTC‐type, polarity independent. The inside of the cover also fitted with a scale and the knob could easily be moved.
Control ‐ Thermostats 10
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Termonic 26090
• • • • •
Electronic thermostat Switchable between three temperature ranges. Adjustable switching differential 1‐10°K Sensor monitoring SEMKO approved
Technical data Temperature range .................................... ‐15° to +95oC Rated voltage ........................................... 230V 50/60 Hz
Power consumption .............................................. 1.5 VA
Wiring diagram/Dimensions
Ambient temperature .................................‐10° to +55°C Max. breaking current...................................... 10A/250V Relay................................................ 1 VX (potential free) Relay indication .............................................. yellow LED Switching differential ............................................ 1‐10°K Electrical service life ........................................... 1 x 10E5 Mechanical service life ..................................... 10 x 10E6 Electric connection .................... screw terminal, 2.5mm² Temperature setting .............................. screwdriver slot Sensor PTC ................................................ PVC 3m (50m) Enclosure ........................................... grey polycarbonate Enclosure sealing class ............................................. IP 40 Package ...................... thermostat complete with sensor Mounting ................................... according to DIN 50022
Range of application Refrigeration plants, air conditioning plants, frost protection monitoring, indoor and outdoor heating cable applications.
Characteristics An electronic thermostat for universal use, using a modern surface mounting technique. Wide temperature range. Adjustable switching differential for high loads and harsh industrial environments. Sensor monitoring using LED indication of failure or short‐circuited sensor. Sensor of the PTC‐type, polarity independent.
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Control ‐ Thermostats 11
Compact thermostat for installation in switch cabinets (on DIN rail) ITR 79 Electronic thermo controller with remote sensor Tecnical data
Operating voltage ................................ 250 V~, 50/60 Hz Switching capacity: .......................................... 24‐250 V~ ..................................................... make contact: 10(3) A, .................................................... break contact: 5(1.5) A Contact: .... 1 relay as potential‐free changeover contact Switching difference: ........................ adjustable 0.5 … 5K ...................... except ITR 79.600, ITR 79.608, ITR 79.503 Ambient temperature: .................................... ‐10…+40°C Degree of protection: ............................................... IP20 Protection class: ............................................................. II Mode indication: ................................... red LED: Heating ........................................................... green LED: Cooling Mounting/Installation: ...................... on DIN‐rail (35mm) Electrical connections: .... terminal screws, max 2.5 mm² Colour: ................................................... grey (RAL 7035)
Type ITR 79.402 ITR 79.404 ITR 79.405 ITR 79.406 ITR 79.408 ITR 79.503 ITR 79.504 ITR 79.508 ITR 79.600 ITR 79.804 ITR 79.805
Part.no D 4780167 D 4780155 D 4780181 D 4780205 D 4780179 D 4780524 D 4780371 D 4780369 D 4780508 D 4780545 D 4780557
Control range ‐35…+15°C 0…60°C 35…95°C 70…130°C ‐10…+40°C 0…11°C 0…60°C ‐10…+40°C
2 X 5…30°C
0…60°C +35…+95°C
Range of application Control and supervision of temperatures in halls, green houses and of temperatures developed by fl oor heating systems. The devices dispose of a sensor breakdown and short‐circuit protection Sensors are not included in the scope of the delivery (except ITR 79.804, ITR 79.805, ITR 79.608). Application of sensor types according to sensor no. indicated (i.e. all no. 24 or 4 sensor types can be used, e.g. HF‐4, LF‐24, etc.). Avoid parallel laying of sensor line and mains supply cables or protect it by shielding.
Equipment
Sensor
Heating, red LED
1/21 (NTC 1 K) Heating, red LED 4/24 (NTC 10 K) Heating, red LED 5/25 (NTC 50 K) Heating, red LED 6 (NTC 100 K) Heating, red LED 3/23 (NTC 8 K) frost protection, manual reset, switching difference: 1.5 0/20 (NTC 2 K, fi xed red LED (sensor short‐circuit at 75 °C) K 25) Cooling, green LED 4/24 (NTC 10 K) Cooling, green LED 3/23 (NTC 8 K) heating, switching difference: 0.5 K fixed
2 (NTC 47 K)
scale 0 … 6, heating, red LED, incl. sensor HF‐8 / 4‐K2 (4 8 (NTC 2 K) m), isolated heating, red LED, incl. sensor HF‐8 / 4‐K2 (4 m), isolated 8 (NTC 2 K)
PG A A A A A A A A PG A PG A A
Control ‐ Thermostats 12
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Compact thermostat for installation in switch cabinets (on DIN‐rail) ITR 79 Electronic thermo controller with remote sensor
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Control ‐ Thermostats 13
The JET‐32 Double thermostat for roof and gutter deicing applications Technical data
Regulating range .......................................... ‐10.... +40°C Switch differential .................................................... ~ 2°K Power supply .............................................. 14 – 250 VAC Max load ........................................ 16A (4) 24 – 250 VAC Enclosure IP‐rating. .................................................. IP 65 Enclosure material ............ Impact resisting plastic (grey) Ambient temperature .................................... ‐25 …+55°C
Weight ....................................................... approx. 500gr
Mounting ......................... Use the supplied screws to fix
Connection
Made in ............................................................. Germany
OUT
Approval ...................................................................... CE Basic setting: .....................‐ Minus thermostat (left) ‐5°C ......................................... + Plus thermostat (right) +2°C
Range of application - Function The thermostat should be located on the outer wall, very near to the gutters/drainpipes that are to be frost protected.
IN BASIC SETTING +2°C
BASIC SETTING ‐5°C
Connect the heating loops directly to the thermostat, which is fed by a 230 V 16A maximum power supply.
Control works on the plus‐minus principle, meaning that heating starts when the temperature is within preset values (e.g.. –5 ‐‐ +2). This is the kind of temperature range in which ice may be expected to form on roofs and in gutters.
Control ‐ Thermostats 14
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Electronic gutter thermostat Velox‐1442 DT
With double transmitters for frost protection of roof gutters and down pipes
Technical data
Rated voltage ................................. 220V ± 10% 50‐60 Hz Output relay ......................................................... 10 amp Power consumption ................................................. 3 VA Ambient temperature .................................. ‐20 to +50°C Temperature range: ..................... Start temp: +10 to 0°C ...................................................... Stop temp: 0 to ‐10°C
Adjustment
Switching differential ..................................... 0.4°C fixed LED signal ............................................... Red: Heating on ............................. Yellow: Temperature above set point .............................. Green: Temperature below set point Prepackaged ......... Gutter thermostat including one wall ............................................. sensor and one roof sensor
Advantages
• • • •
One unit offering a complete solution The sensors can be placed far from the thermostat Large output power, can control directly Can be delivered as one kit, with sensors for wall and roof.
• LEDs showing the temperature in relation to the sensors.
• Safe function with lowest possible energy consumption.
Description ETR‐1442P/F is a thermostat designed specially for the control of heating cables in gutter de‐icing applications. The thermostat employs two sensors to achieve efficient and reliable de‐icing under varying temperature‐ and solar radiation conditions.
Connect the thermostat according to the wiring diagram. On the front of the thermostat casing, set the "High" and "Low" temperatures to, for example, ‘3’ and ‘2’ degrees., respectively. If the sensors have been correctly placed, the application will, in most cases, work satisfactorily. If there are icicles to be melted, you should check which LED light is on. If the green LED light is illuminated, turn the "Low" dial towards lower temperatures until the red LED goes on. If the yellow LED is illuminated, turn the "High" control towards higher temperatures until the red LED lights up. A correctly adjusted de‐icing system will prevent icicles and similar shapes from forming. For lowest possible energy consumption, settings should be as close to ‘0’ as possible. If icicles are being formed, when the red light is on, the amount of heat applied is too small or no heat at all is applied. For a large roof it is advisable for each side of the roof to have a separate heating installation so that energy consumption is kept as low as possible.
Dimensions
The thermostat works on the basis of the plus/minus system. The plus sensor ("High", terminal blocks 8 and 9) is located on the wall facing north where it senses the outdoor temperature. The plus sensor setpoint (high limit) is selected from within the 0 to 10°C range by adjusting the “High” control. When air temperature around the sensor is above the predetermined set point, no heat is applied. The minus sensor ("Low", terminal blocks 12 and 13) is located on the side of the roof that faces south. The minus sensor setpoint (low limit) is selected from within the minus 10 to 0°C range by adjusting the l "Low" control. Power is not switched on until the air temperature at the sensor falls below the predetermined set point.
Wiring diagram
The thermostat is delivered complete with a 10 A potential‐free reversing contactor.
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Control ‐ Thermostats 15
Ice and snow detector TEKMAR 1773 Range of application: •
Non slippery ground surfaces/snow melting of ground surfaces
•
Roofs and gutters free from ice
•
Parabols, roof windows etc free from ice
Technical data Installation: ............................................ Din‐rail (indoor) Operating voltage ............................................... 230VAC Output ........................................... 1 closing ‐‐ 230V / 6A Sensor ........................... 2 x Temperature / Precipitation Alarm output ................................................ 24V / 15mA Control ............... Moisture / precipitation/ Temperature Temperature limitation function Delay of disconnection ..................................................................... 0,5 10 hours Basic heat function ......................................... Adjustable Approval ............................................................. CE, VDE
Advantages: TEKMAR have eliminated the problem with dirty moisture sensors in metal which does not give rash. By developing a technique that, instead measures the sensors cooling, you can ignore the external environment. Micro‐processor based control unit for snow and ice melting on ground surfaces, roof and other areas where ice formation and frost causes inconveniences. The system is closing a contact to connect the heating system when rain or snow is falling within an adjustable temperature zone. The heat is disconnected when the surface have dried up, the unit have an adjustable pre‐ heating time for compensaton of failed location of the sensor. Sensors are available for installation in ground surfaces occupied by walkers/vehicles and roof surfaces and other surfaces which are not exposed to mechanical loads. 1773 have a basic heating function which can maintain a delayed temperature i the ground for a quicker thawing at precipitation in harsh nordic climates. Programming the unit is done with simple menu system shown on a display where also the status of the unit can be read. Programming can be done in different steps, the unit is supplied with a basic programme and in Quick Setup the necessary adjustements is done to start‐up the application. In other menues the unit can be tested, advanced settings can be performed and reset to factory settings be done.
General description of the functions Ice and snow melting Regulator 1773 is an adjustable regulator fitted for several applications whre protection against ice formation is needed. This type of regulator can save 30‐40% power compared to a conventional thermostat. The savings is that, in addition to measuring the temperature measuring rainfall / frost on or adjacent to the surface which are to be protected from icing. The sensors are of a type which instead of measuring the conductivity of the water between to blank metallic wires heat up the sensor periodically (approx. 25 minutes) and measure the cooling of the sensor to point out eventual precipitation. This type of measuring gives a good operating safety to a minimum of maintenance. When connecting two sensors the application stars when one of the sensors detects moisture and preset temperature range for operation and continues until both sensors are dry. The active temperature range is +5 ‐ ‐25°C which includes the temperature range when risk of precipitation and slippery is present. Can be adjusted in the Configuration menu. At surface applications 1‐2 surface sensors of the Type 3352 with brass sleeve (must be used when laying of asphalt) is used or 3353 without brass sleeve. At ramps, it is very effective with a sensor at each end of the ramp when the melted precipitation flowing down the ramp while the upper part of the ramp is usually the first to get rainfall. It is also important to ensure that the drains exists and also works at minus degrees.
Control ‐ Thermostats 16
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Ice and snow detector TEKMAR 1773 When used for roof installations and dishes a 3351 roof sensor in combination with air sensors in 3115 is used. For frost protection of roof drainage system a moisture / rain sensor in the gutter / down pipe and a temperature sensor in the shade / the north wall is used. At protection of ice of satellite mounted moisture / rain sensor on the console of the dish bottom edge. When the sensors are installed it is not always possible to know/calculate where most snow will be gathering. Therefore a function is provided with minimum connection time ((Minimum heating run time) to compensate for eventaul abnormalities. Can be adjusted to operate in 0,5 10 hours (2 hours standard) so that the surface can dry up. The unit also have a function for basic heat. This function keeps the ground surface at a rised temperature, for example ‐5°C to accelerate melting without consuming full power. The function is used for ground surfaces with high priority, for example public entrances, emergency wards at hospitals. At poor function can a fault location and adjustmen easily be done by using the units status and test programme. Faults on sensors are also indicated of a flashing red LED on the front of the unit. 1773 have also an alarm output (24V max. 15mA) which can be connected to a alarm panel and signalling at eventual errors.
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Control ‐ Thermostats 17
LCD® ‐1H & LCD® ‐ 3H Snow switch
Minimize Hydronic Snow Melting Costs
Features & Advantages • • • • • • • •
Description
Minimum energy costs Automatic snow melting Snow melt only when necessary Sense both temperature and precipitation Performance optimized for hydronic applications Simple installation Reliable Low cost
LCD‐1H & LCD‐ The LCD–1H & 3H Snow Switch saves energy by providing snow melting only when required during snowfall and for a time thereafter to ensure complete melting. As heavy, wet spring and autumn snow often occurs above freezing, the LCD–1H & LCD–3H detects precipitation as snow at temperatures below 38°F (3.3°C). The LCD–1H's internal, isolated 3 amp relay contact remains closed for a 5‐hour hold‐on time after snowfall stops to ensure complete snow melting and pavement drying. The LCD–3H remains closed for 1‐hour hold‐on time.
The LCD–1H & 3H Snow Switch achieves high performance at low cost through microprocessor control. Members of the LCD product family have provided more than 70 million hours of reliable snow melting control. For complete information describing application, installation and features, please contact Customer Service or check on the web at www.networketi.com.
Installation The LCD–1H Snow Switch housing has one 1/2” (16mm) NPT threaded opening. Choose an unobstructed elevated location exposed to snowfall. Rigidly mount in upright, plumb position as shown. Connect the black and white wires to the 24 VAC power supply. Yellow wires are from an isolated 3 Amp resistive/1 Amp inductive relay contact.
Control ‐ Thermostats 18
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LCDTM‐3S Snow‐ and ice‐breaker Benefits
• Minimize operating cost • Automatic de‐icing • Unattended operation Features
• • • • • •
Heaters operate only when needed. Senses ambient temperature and precipitation. Factory programmable for special applications. Simple installation. Field proven reliability Low cost.
Description The LCD‐3S Snow Switch senses both temperature and precipitation. Heaters operate at temperatures below 38°F (3.3°C) during precipitation and for one hour thereafter. Heavy, wet spring and fall snows often occur at temperatures above freezing. The 38°F (3.3°C) setting ensures effective snow melting under these conditions. Otherwise, snow may accumulate before melting starts. Continued heater operation for one hour after snow stops completes the melting. Members of the LCD product family have provided more than 70 million hours of reliable snow melting control. These products continue to be the industry's most popular snow melting control family. The LCD‐3S operates from a 120 volt AC 50/60 Hz supply. Options include operation from a variety of supply voltages. The LCD‐3S provides a Form A (SPST) relay contact rated for 120/240 volt 16 Amp service. The LCD‐3S employs one‐time programmable microcontroller technology. All sensor signals are digitized. This allows for the addition or modification of performance features without changing changing any hardware. Contact Customer Service for additional information about product customization. Other LCD‐3S features include a smart bypass and a low temperature lockout. The smart bypass switch permits testing or overriding the automatic control functions. The LCD‐3S reverts to automatic operation after 40 hours in the event that maintenance personnel leave the switch in the bypass or off positions. The low temperature lockout saves energy by preventing heater operation below 17°F (‐8.3°C) ambient which is usually too cold for effective snow melting.
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Control ‐ Thermostats 19
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Telephone: +46‐301‐418 40 – Email:
[email protected] – Homepage: www.vkts.se
Industrihuset
Södra Hedensbyn 43
S‐430 64 HÄLLINGSJÖ
S‐931 91 SKELLEFTEÅ
Sweden
Sweden
Fax: +46‐301‐418 70
Fax: +46‐910‐881 33
