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P a g e
Thermostat is satisfied
R is disconnected from W
Heat generator is turned off
Auxiliary 24VAC power is turned off
Pump turns off and fan speed ramps down to zero, extracting any remaining heat in the
coil
Basic Modulation Mode
Heating Mode – (ecosmart outdoor sensor not installed)
Thermostat calls for heat
R is connected to W
Heat generator is turned on
Auxiliary 24VAC power is turned on
Pump turns on at 100%
After a 15 second delay to allow for system water to heat up coil, fan ramps up to HEAT
CFM speed
Thermostat is satisfied
R is disconnected from W
Heat generator is turned off
Auxiliary 24VAC power is turned off
Pump turns off and fan speed ramps down to zero, extracting any remaining heat in the
coil
Cooling Mode (Modulation, Step and Basic)
(ecosmart outdoor sensor not installed)
(Assumes a condenser and DX coil is installed within the system)
R is connected to Y or Y2*
Condenser turns on
Fan ramps up to COOL CFM setting
* If thermostat and condenser support 2-stage cooling