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Configured for Heat Pump with Gas Furnace)
The thermostat has the capability to control dual
fuel systems without an outdoor sensor or Smart Fuel
logic.
8. Advanced Setup — Dual Fuel by Smart Fuel
Operation
In the Smart fuel logic configuration, the Com-
mercial Communicating Programmable Thermostat
can determine when the heat pump is no longer effi-
cient and optimize system changeover to the fossil
fuel back-up. In the Smart Fuel Logic menu, you have
a choice of 1-9 settings. Default setting is 5 and can be
adjusted up to 9 to bring on fossil fuel sooner at higher
outdoor temperature or down to 1 to keep the heat
pump on at a lower outdoor temperature.
9. Advanced Setup — Dual Fuel by Sensor
Operation (Available When Outdoor Sensor is
Connected and Enabled)
In sensor configuration the Commercial Commu-
nicating Programmable Thermostat you can select the
outdoor ambient temperature (HP Lockout) the sys-
tem will switch from heat pump to fossil fuel
(-20 to 30° F range). You can also select an outdoor
ambient at which temperature and above the Auxilia-
ry heat is disabled (Aux Lockout selection range 34 to
90° F).
10. Advanced Setup — Heat Pump Comfort /
Economy Operation in Heat mode (Available
when configured for Heat Pump)
Comfort mode: In Heating mode. If the heat pump
is not able to satisfy the heating setpoint, the auxiliary
heat will be energized to satisfy the same heating set
point.
Economy mode: In Heating mode. If the heat pump
is not able to satisfy the heating setpoint, the auxiliary
heat will be energized to satisfy only when the tem-
perature has dropped 2.0° F (1.1° C) below the heat-
ing setpoint. Selecting economy mode will add a
deadband between the heat pump & auxiliary heat in
heating mode. The actual temperature maintained will
be lower than the true heating setpoint to maximize
the heat pump efficiency.
11. Advanced Setup — Heat Lockout Outdoor
(Available When Outdoor Air Sensor is Enabled)
Disables heating operation based on outdoor air
temperature. When the outdoor air temperature is
above this value, all heating is disabled. (Setting
range is from -15 to 120° F.)
12. Advanced Setup — Cool Lockout Outdoor
26 • Commercial Communicating Programmable Thermostat I&O Manual
(Available When Outdoor Air sensor is Enabled)
Disables cooling operation based on outdoor air
temperature. When the outdoor air temperature is be-
low this value, all heating is disabled. (Setting range
is from -20 to 95° F.)
13. Advanced Setup — Compressor
Optimization
Allows for a more comfortable and efficient oper-
ation of heating and cooling. When the Compressor
Optimization is enabled "on" the circulator blower
(fan) will energize five seconds after the compressor
energizes when cooling (and heating for heat pump
applications). In cooling to extract additional cooling
form the system the circulator blower (fan) will re-
main energized for twenty seconds after the compres-
sor de-energizes when cooling.
14. Advanced Setup — Dehumidification
This feature functions in the cooling mode and al-
lows for dehumidification by enabling cooling opera-
tion to reduce humidity. You have two
dehumidification mode choices: Optimum Comfort
(OC) and Optimum Dehumidify (OD).
• Optimum Comfort (OC): Operates by alerting the
room temperature to a "feels like" temperature when
the indoor humidity level is above the user setting.
The altered temperature allows for longer cooling
cycles to lower the indoor humidity.
• Optimum Dehumidification: Operates by initiating a
cooling cycle when humidity level is above the user
setting and the room temperature is not less than
three degrees below the setpoint. Cooling will re-
main on until the humidity level drops to within 2%
of the setting, or the room temperature falls to 3 de-
grees below the setpoint.
15. Advanced Setup — Deadband
Deadband is a user selectable temperature range
the thermostat will maintain between the heating and
cooling setpoints while operating in auto-changeover
mode. In auto-changeover the cooling setpoint must
be higher than the heating setpoint to avoid a conflict.
The user can program the heat and cooling setpoints
at the same setting and the deadband will resolve set-
point conflicts. Default setting is 2 with a range of 2
to 4° F.
16. Advanced Setup — Power-up Delay
The feature will momentarily delay system start-
up after a power outage (each time 24VAC power
supply to thermostat is interrupted and reapplied) the
user can select a delay of operation of the system (fan,
cooling or heating). This feature can be used to se-
026-1729 Rev 2 15-NOV-2016
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