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all settings made in the iQ thermostat/controller dealing
with temperature setpoint (temporary hold, vacation hold,
permanent hold, time schedule, smart recovery) do not apply
unless zone control is disabled. Similar features are provided
and controlled at each zone independently, from the local
zone thermostats. For example, Manual Setpoint Control
replaces Temporary Hold, Automatic Setpoint Control replaces
time schedules, and Sleep Mode replaces Smart Recovery.
See the iQ Zone System Zone Thermostat User’s Manual for
information on these alternative features. With the iQ Zone
system a single setpoint is used for both heating and cooling,
as opposed to the standard non-zoning system, which uses
a different setpoint for each.
Zone Control is enabled by default if the system is equipped
with and wired for iQ Zone (the normal operating situation).
However, zone control operation can be disabled by choice,
or it may be automatically disabled if there is a problem
detected with it.
To manually disable zone control when zoning
is already enabled:
Z O N E C O N T R O L
E N A B L E
MODIFY
PREVIOUS
SAVE
Z O N E C O N T R O L
1. From the Main Screen select MENU using the
or button.
2. Press the button.
3. Select SETTINGS using the or button.
4. Press the button.
5. Select ZONE CONTROL using the or button.
6. Press the button.
7. Press the or button to change ENABLE to DISABLE.
8. Press the button to save the setting.
To restore zone control (when the zoning system components
are functioning properly), follow the above sequence, but in
step 7 change DISABLE to ENABLE.
iQ Zone offers two types of ventilation that can be turned on
when the cooling or heating systems are not running:
• To deliver air to some but not all zones when not heating
or cooling, use the zone ventilation feature that is set up at
the individual zone thermostats. See the iQ Zone System
Zone Thermostat User’s Manual for information on how to
set up zone-by-zone ventilation. From the FAN MENU, enter
the VENTILATION SPEED screen in the iQ thermostat/
controller to select or modify the relative speed to be used
when this type of ventilation is operating.
• To use the fan to deliver air to all zones when not heating
or cooling, set the Fan Mode to ON. The Intermittent Fan
feature described earlier will also operate, serving all zones.
Refer to the iQ Drive User’s Manual for other details relating
to zone control operation.
System Operation: Quick Start
The following is a summary of the sequence for typical operation
of the system.
1. Set the date and time (if not already set).
2. Check the program schedule for desired “setback”, and
modify if desired.
3. From the main screen, check/set the Fan operating mode:
• AUTO operates the fan (indoor blower) when the unit is
cooling or heating. This is the “normal” setting.
• ON operates the fan at the selected speed at all times.
The selected speed may change when the compressor,
electric heat, or furnace is operating.
• PROGRAMMED FAN operates the fan in AUTO or ON
as specifi ed in the program schedule.
4. From the main screen, check/set the Mode:
• COOL runs the heat pump as an air conditioner using
the cooling setpoint. (With iQ Zone, zone control enabled,
there is a single setpoint for both heating and cooling.)
• HEAT attempts to run the heat pump to provide heat using
the heating setpoint. If (a) the outdoor temperature is
below the Heat Pump Usage Limit, or (b) the heat pump
cannot satisfy the load, or (c) the heat pump is disabled
due to a fault, auxiliary (backup) heat will operate. If
backup heat is electric strip heat, it may operate along
with and supplementing the heat pump. If backup heat
is a gas furnace, the furnace and heat pump will not
operate at the same time (except during defrost). (With
iQ Zone, zone control enabled, there is a single setpoint
for both heating and cooling.)
If the outdoor coil temperature is below 35°F, demand
defrost is enabled. Under these conditions, a fi rst time
defrost will occur after approximately one half hour of
compressor operation. Subsequent defrost cycles may
be triggered by a drop in outdoor coil temperature or by
a maximum time between defrosts of 6 hours. Refer to
training material for details.
• E HEAT will run the auxiliary heat (electric strip heat or
gas furnace) using the heating setpoint and disable the
heat pump.
• OFF terminates any of the above.
NOTE: Equipment may not shut off immediately after
switching to OFF due to various system limitations.
Once put into the OFF mode, wait until the furnace or
compressor has shut off before selecting another mode.