17 of 28
© 2011
D 529 - 12/11
Heating Operation
Section A
Sequence of Operation
When using only a room temperature sensor, the thermostat operates the heating
system to maintain the Set Room Heat temperature.
When using only a floor temperature sensor, the thermostat operates the heating
system to maintain the Set Floor Heat 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 temperature sensor 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 Room Heat
temperature, the thermostat operates the heating system to maintain the Set Room
Heat temperature. The floor is never heated above the Floor Maximum setting in
order to protect the floor covering.
The H1 symbol indicates that the thermostat is heating with stage 1. The H2 symbol
indicates that the thermostat is heating with stage 2. The heat can cycle on and off
/- 1.5°F (1°C) of the Set Room Heat temperature.
Second Stage Differential
--------------------------------------------
--------------------------------------------
The Heat 2 Differential setting allows for a reduction in second stage operation by
applying a temperature differential for second stage below the room target. The
Heat 2 relay is turned on once the air temperature reaches the Set Room Heat
temperature minus the Differential setting. The Heat 2 relay is shut off once the air
temperature reaches the Set Room Heat temperature minus 1.5°F (1.0°C). The
automatic differential (AU) setting operates the second stage to provide optimum
comfort level. When the Differential is set to Off, the second stage is disabled.
Second Stage Heat Source
-------------------------------------------
-------------------------------------------
The Heat 2 Source setting determines which water temperature the second stage
will draw its heat from. Select boiler temperature, mix 1, mix 2, mix 3, or other
(non-hydronic). If “other” is selected, a heat demand will not be sent from second
stage to the tekmarNet
®
reset control.
Freeze Protection
----------------------------------------------------
----------------------------------------------------
The thermostat operates the heat whenever the room or floor temperature falls
below 40°F (4.5°C).
