tekmar 552 Thermostat Installation - Manual (Page 29)

© 2014 552_D - 09/14
29 of 44 A Watts Water Technologies Company
Heating Operation Section A
Sequence of Operation
Set Heat Temperature ----------------------------------------------- -----------------------------------------------
When using only a room temperature sensor, the thermostat operates the heating
system to maintain the Set Heat Room temperature.
When using only a floor temperature sensor, the thermostat operates the heating
system to maintain the Set Heat Floor temperature. In this case, the thermostat
does not try to control the air temperature. This is ideal for bathrooms and some
kitchen applications where the customer wants their feet to feel warm on the floor.
This is also ideal for garages so that the heating system is not affected by the
opening of the garage door in cold outdoor weather.
When using both a room and a floor temperature sensor, the thermostat always
maintains the Floor Minimum temperature, even when the air temperature is satisfied.
When the air temperature is below the Set Heat Room temperature, the thermostat
operates the heating system to maintain the Set Heat Room temperature. The
floor is never heated above the Floor Maximum setting in order to protect the floor
covering. Suggested Floor Maximum settings are 90°F (32°C) for tile, stone, or
concrete floors and 85°F (29°C) for wood floors.
The “Heat On” symbol is shown on the display when the thermostat is heating.
Room Minimum and Maximum ---------------------------------------- ----------------------------------------
Room Minimum and Maximum temperature settings are available in the Set Temp
menu. These allow the installer to select start and stop limits for the temperature
setting for the User and Limited access levels. This is useful in commercial
installations and child / guest bedrooms where availability of the full temperature
setting range may not be desirable.
Warm Weather Shut Down -------------------------------------------- --------------------------------------------
When the outdoor air temperature exceeds the Warm Weather Shut Down (WWSD)
setting on the tekmarNet
® main control, the heating system is shut off.
Radiant Floor Baseload ---------------------------------------------- ----------------------------------------------
When the terminal unit is selected to be a Hydronic Radiant Floor (HRF1 or HRF2)
and no floor temperature sensor is installed, the thermostat has option to provide
baseload heating. This allows the radiant floor to be heated even though the room
air temperature is satisfied. This is useful in areas where a radiant floor heating zone
is overlapped by an air heating system. The radiant floor heating is overwhelmed by
the quick heat up rate of the air heating system, resulting in a radiant floor heating
zone that rarely turns on. The radiant baseload option allows the radiant floor to
counteract the air heating system by heating the floor at a reduced output even when
the room air temperature is satisfied. This is also useful in areas that experience
large solar gains through windows. The radiant baseload is automatically shut off
in the summer by the warm weather shut down feature.