Dual Fuel Operation - TOTALINE P374-1900 Owner's Manual

SECTION 13

Dual Fuel Operation

Dual Fuel Operation
Programming the Thermostat to Programming the Thermostat to
Operate a Dual Fuel System Operate a Dual Fuel System
Advanced Setup step #21 (next page) allows this thermostat to be
configured to control two heat sources for Dual Fuel operation.
Dual Fuel systems utilize an outside temperature sensor. When the
outside temperature is at or below the Changeover Balance Point,
step #22 (next page), the primary heat source is 'locked out' and
the heat source connected to W3 is energized. There is a three
degree deadband from the Changeover Balance Point, which
requires the outside temperature to rise three degrees before
switching back to the primary heat source. If an outside
temperature sensor (RS2) is not installed and the thermostat is
programmed for Dual Fuel operation, 1st and 2nd stage heating is
locked out and only W3 will be energized (see page 13.3 for
detailed information).
For outside sensor (RS2) wiring please see page 16.2 of this
manual and for the thermostat jumper setting and wiring
instructions please refer to page 5.6 of the Installation
Instructions.
Page 13.1
TOTALINE
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