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2. Emergency Heat switchĊWhen the Harmony IIIt
control center is used with a heat pump and the Emer-
gency Heat switch is turned ON, the unit will satisfy all
heating demands with electric backup heat. When the
Emergency Heat switch is OFF, the heat pump is used
to satisfy heating demands. (This switch has no effect
on operation in a non-heat pump system, for example,
Option 1, described on page 2.)
NOTE − Usually, Emergency Heat is more expensive
to operate than Heat Pump heating. If so equipped,
use Emergency Heat only when necessary.
To turn off the system, either: A − Turn each thermostat to
OFF, or B − Turn the master thermostat OFF and turn the
control center to central (Vacation ON) mode.
Vacation OFF for individual zone control.
Vacation ON for all zones to be conditioned
at the same time.
Emergency Heat OFF to allow Heat Pump
to provide heat.
Emergency Heat ON to force auxiliary
(backup) heat to provide all heating
(disallows heat pump from providing any
heat).
Damper LEDs come on to indicate
the damper to zone # is CLOSED
(No air being permitted to LIT zone)
Comes on when
Emergency Heat
switch set to ON
ON indicates only Zone 1
thermostat is functional and
controlling air to ALL zones.
LEDs come on to indicate the current operating mode