Install Instructions

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A Watts Water Technologies Company

Fan Operation

The fan operates together with the air heating or cooling systems. The user can also

select to operate the fan manually by pressing the Fan button. This allows the user to

choose between Auto and On. “Auto” allows the fan to operate with heating or cooling,

but normally the fan is off. “On” forces the fan to operate continuously.

Ventilation Fan

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In order to provide ventilation to a building, the fan can operate beyond the time required

for the heating and cooling systems. Vent Mode allows the user to set the fan to operate

for 10 to 90% of an hour, in 10% (6 minutes per hour) increments, as well as in Auto

and On mode. This is available when the Vent Mode setting in the Setup menu is set

to On.

Once Ventilation is set to On, the Fan minimum run time percentage during the and

events can be set so that the fan can operate on a schedule and/or together with scenes.

Fan Post Purge

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The fan relay includes a post purge feature that operates the fan after the heating or

cooling system has shut off. When a duct temperature sensor is installed the length

of post purge is based on the air duct temperature and the Heat Purge or Cool Purge

temperature settings. When there is no duct temperature sensor installed, the length

of post purge is based upon the Heat Purge and Cool Purge time settings.

Hydronic System Supply Pump

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When connected to a tekmarNet

system control, the thermostat’s W Pump setting

affects the operation of the primary pump or mix pump on the system control. When

the thermostat is connected to the boiler bus, the boiler system or primary pump is

operated. When the thermostat is connected to the mix bus, the mix system pump is

operated.

If the thermostat operates a motorized or thermal motor zone valve, the W Pump setting

should be set to On.

If the thermostat operates a thermal motor (wax actuator) zone valve, set the W Thermal

Motor 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 W 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.

DHW Tank Priority

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When a tekmarNet system control is heating an indirect Domestic Hot Water (DHW) tank,

the thermostat may shut off the heating zones to allow the DHW tank to recover quickly.

Priority is determined by the DHW priority setting on the tekmarNet system control.