Page 3
3. Emergency Heat Switch. When the Harmony IIIt control
center is used with a heat pump and the Emergency 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 oper-
ate than Heat Pump heating. If so equipped, use Emergency
Heat only when necessary.
To turn off the Harmony IIIt Zone Control System, either:
A − Turn each thermostat to OFF, or
B − Turn the master thermostat OFF and turn either vacation
switch to Vacation ON".
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 cur-
rent operating
mode
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