1.800.627.4499
Premium Commercial Controls
ERV
50
TEMPERING CONTROL
Increasing temperature turns
mode ON at se hysteresis
Decreasing temperature
turns mode OFF at setpoint
Hysteresis
Se Hysteresis
Setpoint
OFF
ON
TEMPERATURE
6.4.1.3 Heat Pump 1 Stage Heating Operation
This type of heating cycles one stage of compressor to maintain the heating setpoint while
the reversing valve is in heat mode. There is also an option to use axillary heat when the OA is
below a certain temperature. You must set a hysteresis value whereby the stage will turn on
at the se hysteresis and turn at setpoint. There is also a minimum on and off time to
prevent over-cycling.
If in heating mode, and the unit calls for heating, it puts the tempering mode output used for
a reversing valve, in the heat position and after a delay, will turn the compressor on and off to
maintain the heating setpoint.
Decreasing temperature turns
mode ON at se hysteresis
Increasing temperature
turns mode OFF at setpoint
Hysteresis
Heat Setpoint
Setpoint - Hysteresis
OFF
ON
TEMPERATURE