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Sequence of operation – tekmar 518 Thermostat Installation User Manual

Page 8

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© 2013

518_D - 03/13

8 of 12

A Watts Water Technologies Company

Heating Operation

Sequence of Operation

To change the heat temperature setting, push the

or

button to select a preferred

temperature setting. The Heat On symbol is shown on the display when the thermostat is
heating. The heat can cycle on and off within +/- 1.5°F (1°C) of the temperature setting.

The floor and air heating can be shut off by holding the

button until Set Room is Off.

To resume heating when the Mode is Off, press the

button to navigate to the Mode

setting, then press the

button to select Mode Heat. The thermostat will resume

heating at the last previously set temperature.

Air Temperature Only

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If there is only an air temperature sensor (no floor sensor), the thermostat operates to
control your desired air temperature.

Floor Temperature Only

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If the air sensor has been disabled, the thermostat will only maintain floor temperature
and ignore air temperature. This operation is recommended for areas such as bathrooms
to ensure that tile floors are warm to the touch.

Floor and Air Temperature

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If the air sensor is turned on and a floor sensor is connected, the thermostat will maintain
the desired air temperature as well as a minimum floor temperature.

This operation is recommended for areas with large windows that allow the sun to
shine into a room and keep it warm without the need for heat. This can allow the floors
to cool off during the afternoon. When the sun goes down, it can take a long time for
the floors to get warm again. This may cause the room to cool off too much in the early
evening. A floor minimum setting can help with this condition by maintaining a floor
minimum temperature. Keep in mind the floor minimum temperature will override the
air temperature, and if set too high, may overheat the room.

This operation is also recommended for rooms with hardwood floors. Setting floor
minimum and maximum temperatures is a way of enhancing the comfort of the living
space while protecting floor coverings.

90°F (32°C)
Feels hot to the touch

80 to 85°F (26 to 30°C)
Feels warm to the touch

70°F (21°C)
Feels cool to the touch

40 to 45°F (5 to 7°C)
Feels cold to the touch

Suggested maximum for all floor
types other than wood.

Bathrooms and kitchens. Suggested
maximum for wood floors.

Rooms with large windows preventing
under heating in the evening.

Freeze protection for garages.