tekmar 553 Thermostat Installation - Manual (Page 36)

© 2014 553_D - 09/14
36 of 52 A Watts Water Technologies Company
The first stage operates on a temperature differential of ±0.7°F (±0.4°C) centered
around the heating setpoint. The second stage heat turns on when the temperature
drops 0.7°F - W2 Differential setting below the heating setpoint. The second stage is
shut off once the temperature reaches the heating setpoint.
The second stage W2 is prevented from turning on until the first stage heat W or the
heat pump operates for the elapsed time set by the W2 Delay setting. Auto provides the
shortest wait time. A setting of OVR prevents the second stage from operating unless
the thermostat Mode is set to Emergency heat.
Warm Weather
Shut down Radiant Floor Warm
Weather Shut Down W2
Lockout Balance
Point
Colder Outdoor
Temperature
Cooling Operation Section C
Set Cool Temperature ----------------------------------------------- -----------------------------------------------
The thermostat operates an air conditioner or a heat pump to provide cooling. The “Cool
On” symbol is shown on the display when the thermostat is cooling.
Floor Cooling ------------------------------------------------------- -------------------------------------------------------
Floor cooling is designed to cool a building together with an air cooling system. Floor
cooling reduces part of the sensible cooling load, while the air cooling equipment must
cool the latent load (dehumidification) and the remaining sensible load.
Warm Weather
Shut Down Cooling Cold
Weather Shutdown
Floor
Cooling Warmer Outdoor
Temperature
No Cooling