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© 2011
D 530 - 12/11
Floor Cooling
Section C
The thermostat has the option to support radiant floor cooling when connected to a
heat pump control using tekmarNet
®
communication. The heating terminal unit type
must be set to be hydronic (HYD), 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 (H1) at the same
time to allow chilled water into the system. The thermostat continues to operate the
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. If only a floor
sensor is installed, the floor cooling setpoint is 67°F (19.5°C).
Hydronic Cooling
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The thermostat has the option to support hydronic cooling using a fan coil or
a chilled beam when connected to a heat pump or chiller tekmarNet
®
system
control.
When operating a chilled beam or a fan coil that uses chilled water for cooling but
does not use hot water for heating, then the Cool Terminal Type should be set to
Coil. The thermostat activates the Y terminal and also provides a cooling call to
the heat pump or chiller control through the tekmarNet
®
communication.
When operating a fan coil that uses both hot and chilled water, then the Cool Terminal
Type should be set to H1. The thermostat activates both the Y terminal and the
heating terminal device (zone valve or zone pump), as well as provides a cooling
call to the heat pump or chiller control through the tekmarNet
®
communication.
Hydronic System Supply Pump
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When connected to a tekmarNet
®
system control, the thermostat’s Cool Pump
setting affects how the primary pump or mix pump on the system control operates
during cooling operation. When connected to the boiler bus, the boiler system or
primary pump is operated. When connected to the mix bus, the mix system pump
is operated.
If the thermostat operates a motorized or thermal motor zone valve, the Cool Supply
Pump setting should be set to On.
If the thermostat operates a thermal motor (wax actuator) zone valve, set the Cool
Supply Pump Delay setting to On. This provides a three minute delay to allow the
zone valve to open before the primary or mix pump is turned on.
In special applications with multiple zoning manifolds, the Cool Supply Pump setting
can be set to Off. This allows a Zone Group Pump located on the Zone Manager,
or Wiring Center to operate the pump for the manifold.
