EcoSmart ES50HVP Service Manual - Heating During Standby Mode
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P a g e
Heating during standby mode
Probable cause is thermal siphoning.
Pump and fan run continuously
(test mode off and no call for heat/cool)
Air out sensor monitors the temperature above the heating coil in the supply airstream and will
turn on the pump and fan if temperature goes below 40°F.
•
Make sure Air out temperature sensor plug is properly seated into board connector (8)
•
Sensor resistance should be approximately 10K at room temperature
Constant Pressure Sensing (CPT™) not working
The HVP control board has an on-board solid state pressure sensor (10). Air from the high
pressure side of the fan is fed via a silicone tube to the right hand port of the sensor. Firstly,
follow the calibration procedure as outlined in the User Manual:
Calibrate procedure:
Constant Pressure Technology (CPT™) automatically maintains the desired airflow within the
ductwork irrespective of outlet vents opening and closing when in heating mode. CPT™ is
designed to reduce airflow noise caused when vents are partially or fully closed. CPT™ is
unavailable when in cooling mode to prevent potential freezing of the DX coil. To enable the
CPT™ function, follow the steps below:
STEP 1
Set desired heat airflow rate using the HEAT DIP switch (11).
STEP 2
Set OPTION switch 6 to the ON position and allow the system to run for at least 1 minute, then
set OPTION switch 6 to the OFF position. The calibration parameter is now permanently stored
in the control board and will be retained even if power is removed from the ecosmart. If the
heat airflow rate setting is changed, calibration must be repeated for correct operation.
To check that sensor is functioning correctly, pull off the silicone tube from the sensor port. The
fan should gradually increase to its maximum value. Replacing the tube will result in the fan
reducing speed to the calibrated value. This shows that the pressure sensor is working
correctly.