12
When heating demand is terminated, a 5 minute minimum
off time delay is initiated.
Second-stage heating is energized if the discharge air
temperature is lower than the set point of the heating
staging temperature set point.
Dual-fuel Operation
NOTE:
Only Lennox communicating heat pump outdoor
units may be used with a dual-fuel system.
When both a gas furnace and a heat pump are present
on the system, the thermostat uses the balance points to
determine which source to use for heating.
When the outdoor temperature is above the low balance
point, the heat pump is always attempted first before using
the gas furnace.
In order to use the gas furnace as a primary heating source
(not defrost tempering) when the outdoor temperature is
between the high and low balance points, the following
conditions must occur:
• Heat pump must be used for a minimum of 30 minutes.
• Temperature in the zone not increase by more than
0.5°F
• Heat pump has not gone into defrost in the 30 minute
period
If any single-zone satisfies the specified conditions, the
heat pump will stop and the gas furnace is used to satisfy
all heat calls for the next duration of the parameter heat
pump lockout time. After the heat pump lock out has
expired, the heat pump is again used as the primary heat
source on the next call after the equipment has stopped.
Emergency Heat Operation - Heat Pump Systems
When the Lennox communicating thermostat emergency
heat is enabled the unit will satisfy all heating demand with
either gas or electric backup heat. When the Emergency
Heat setting is OFF, the heat pump is used to satisfy
heating demands.
Humidity Control
Refer to Lennox communicating thermostat installation
and setup guide for more information on humidity control
settings and operating modes. Note there is no capability
to control humidity (humidification or dehumidification) per
individual zone. Various humidity control modes would be
applicable to the entire home.
Soft Disable
Soft disabling is when Lennox communicating series
thermostat finds an unknown control (indoor or outdoor unit
control, iHarmony
®
zoning system or Equipment Interface
Module (EIM) on the system communication bus. The
room thermostat sends the unknown control a message
to go into soft disable mode until properly configured.
The Lennox communicating thermostat will not show
any code for a soft disabled control. When soft disabling
occurs only the control that has been disabled will display
the blinking LED status. In this case, the control blinks
three seconds OFF and one second ON.
Steps to follow if the damper control module is displaying
the soft disable code
1.
Confirm proper wiring between all devices (thermostat,
damper control module, indoor and outdoor).
2.
Cycle power to the control that is displaying the soft
disable code.
iComfort Wi-Fi
1.
Go to setup / system devices/ thermostat / edit/ push
reset
.
2.
Go to setup / system devices / thermostat / edit / push
resetAll
.
iComfort S30 Thermostat
1.
From the home screen select menu / settings /
advanced settings / view dealer control center /
equipment / thermostat and scroll down to reset
Thermostat.
2.
From the home screen select menu / settings /
advanced settings / view dealer control center /
equipment / reset and scroll down to reset HVAC
equipment.
Summary of Contents for iHarmony 10C16
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