tekmar 553 Thermostat Installation - Manual (Page 38)

© 2014 553_D - 09/14
38 of 52 A Watts Water Technologies Company
Hydronic System Supply Pump --------------------------------------- ---------------------------------------
When connected to a tekmarNet ® system control, the thermostat’s W1 Pump setting
affects how the primary pump or mix pump on the system control operates. 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 W1 Pump
setting should be set to On.
If the thermostat operates a thermal motor (wax actuator) zone valve, set the W1 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 W1 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 --------------------------------------------------- ---------------------------------------------------
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. This is determined by the DHW priority of the tekmarNet
® system control.
Fan Operation Section G
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 together with heating or
cooling but normally the fan is off. “On” forces the fan to operate continuously.
Ventilation Fan ------------------------------------------------------ ------------------------------------------------------
In order to provide ventilation to the building, the fan can also operate for additional
time beyond what is required for the heating and cooling systems. Ventilation allows the
user to select the fan to operate for a minimum percentage out of each hour. Options
are 10 to 90%, in 10% (6 minutes per hour) increments, as well as Auto and On. 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 ------------------------------------------------------ ------------------------------------------------------
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.