Installation and Operation Manual

© 2012 557_D - 11/12
33 of 48
A Watts Water Technologies Company
Radiant Floor Cooling
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The thermostat has the option to support radiant floor cooling when connected
to a heat pump control using tekmarNet
®
communication. The terminal unit type
must be set to be HRF1 or HRF2, the floor cooling setting must be set to On and
the heating system must be in Warm Weather Shut Down (WWSD). When the heat
pump system control operates in cooling mode, all thermostats set for floor cooling
on the tekmarNet
®
bus all activate the first stage heating contact (W1) at the same
time to allow chilled water into the system. The thermostat continues to operate the
floor cooling until either the room temperature reaches the Set Heat temperature
plus 3°F (Set Heat+1.5°C) or reaches a minimum temperature of 74°F (23.5°C). If
only a floor sensor is installed, the floor cooling setpoint is 67°F (19.5°C).
Cooling Cold Weather Shut Down
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When the outdoor air temperature falls below the Cooling Cold Weather Shut Down
(CWSD) setting on the thermostat, the cooling system is shut off.
Room Min and Max Limits
Section C
Heating and cooling 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
settings in both heating and cooling 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.
Air coolingAir & radiant
floor cooling
No cooling
allowed
Colder
Outdoor
Temperature
Set Heat
Room
Room
Warmer
Room
Colder
Warm Weather
Shut Down
Default = 70°F
Cooling Cold
Weather Shut Down
Default = 60°F
Balance
Point
Default = Off
No heat
pump
Y2 on
Y1 on
Y1 off
Y2 off
Y1 on
W1 cool on
Y2 on
Y1 off
W1 cool off
Y2 off
Cooling Mode - No Floor Sensor
Air cooling
Radiant floor heating
Floor minimum
Air & radiant
floor cooling
No cooling
allowed
Colder
Outdoor
Temperature
Set Heat
Room
Room
Warmer
Room
Colder
Warm Weather
Shut Down
Default = 70°F
Cooling Cold
Weather Shut Down
Default = 60°F
Balance
Point
Default = Off
No heat
pump
Y1 on
Y2 on
Y1 off
W1 can turn on
for floor heating
Y2 off
Y1 on
W1 cool on
Y2 on
Y1 off
W1 cool off
Y2 off
Cooling Mode - With Floor Sensor