EWC Controls EWT-3102 User Manual page 92

1. Choose correct heat pump application
in Installer Setup Number 0170.
2. Choose Fossil Fuel Option as the
backup heat source in Installer Setup
Number 0200.
3. Choose No External Fossil Fuel Kit
Option is control- ling back up heat in
Installer Setup Number 0210.
4. Choose Outdoor Temperature Sensor
for Heat Pump Temperature Lockouts
Option in Installer Setup Number 0340.
5. Choose appropriate Balance Point
Temperature in Installer Setup Number
0350.
OPERATION IN HEAT MODE ABOVE BALANCE
POINT (OUTDOOR TEMPERATURE)
When the outdoor temperature is above
the selected Balance Point Temperature
(ISU 0350), only the compressor operates
and the fan (G terminal) energizes when
the thermostat calls for heat. See Fig. 32.
EWT-3102 / EWT-3103 Touchscreen Programmable Thermostat
Fig. 32. Dual Fuel Heat Pump Operation
OPERATION IN HEAT MODE BELOW
BALANCE POINT (OUTDOOR TEMPERATURE)
When the outdoor temperature is below
the selected Balance Point Temperature
(ISU 0350), only the Fossil Fuel (auxiliary
heat) operates and the fan (G terminal)
does not energize when the thermostat
calls for heat.
COMPRESSOR ONLY
FOSSIL FUEL ONLY
in Heat mode with
BALANCE
POINT
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