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| Lennox Digital Programmable Thermostats FAQ |
L221470HP Heat Pump Thermostat Prog/2H/1C/7day, 91H7201
Description: HEAT PUMP APPLICATIONS ONLY! Features − 7 Day Programmable: − Four
programmable time periods per day − a total of 28 for the week. − Program is retained in
permanent memory until it is either erased or overwritten (no batteries required). The clock may
need to be reset after a power interruption, but the program will remain intact. − Large
easy−to−read LCD. − Selectable Fahrenheit or Celsius display. − Display flashes CHECK
FILTER after 360 hours (adjustable) of accumulated fan run time. − On two−stage cooling
models, the LCD displays low and high for first and second stage cooling operation. − When
Manual button is pushed, the thermostat is controlled by the slide settings like standard
thermostats. − Thermostat will return to program run mode after 3−hour temporary manual
temperature override. − Separate button turns on emergency heat. − Intelligent Copy saves
steps during initial programming by automatically copying weekday and weekend programs for
5+2 weekly schedules. − Intelligent Temperature Recovery automatically computes when to
turn on the heat pump so that comfort temperature is efficiently recovered by the start of the
period with minimal use of expensive auxiliary electric heat. This feature is optional and can be
cancelled by turning off option switch. − Green LED status light − system running − Amber LED
status light − manual mode − Flashing amber LED status light − temporary override in effect −
Red LED status light − emergency heat mode − Flashing red LED status light − problem with
the system (when used with HP Monitor Kit 76F53).
Description: HEAT PUMP APPLICATIONS ONLY! Features − 7 Day Programmable: − Four
programmable time periods per day − a total of 28 for the week. − Program is retained in
permanent memory until it is either erased or overwritten (no batteries required). The clock may
need to be reset after a power interruption, but the program will remain intact. − Large
easy−to−read LCD. − Selectable Fahrenheit or Celsius display. − Display flashes CHECK
FILTER after 360 hours (adjustable) of accumulated fan run time. − On two−stage cooling
models, the LCD displays low and high for first and second stage cooling operation. − When
Manual button is pushed, the thermostat is controlled by the slide settings like standard
thermostats. − Thermostat will return to program run mode after 3−hour temporary manual
temperature override. − Separate button turns on emergency heat. − Intelligent Copy saves
steps during initial programming by automatically copying weekday and weekend programs for
5+2 weekly schedules. − Intelligent Temperature Recovery automatically computes when to
turn on the heat pump so that comfort temperature is efficiently recovered by the start of the
period with minimal use of expensive auxiliary electric heat. This feature is optional and can be
cancelled by turning off option switch. − Green LED status light − system running − Amber LED
status light − manual mode − Flashing amber LED status light − temporary override in effect −
Red LED status light − emergency heat mode − Flashing red LED status light − problem with
the system (when used with HP Monitor Kit 76F53).
Description: 90J39 - L212407CC
Thermostat-Prog/1H/2C/7day − Extra−large, easy−to−read LCD. − Selectable Fahrenheit or
Celsius display. − Display flashes CHECK FILTER after 360 hours (adjustable) of accumulated
fan run time. − On two stage cooling models, the LCD displays low and high for first and second
stage cooling operation. − Intelligent Anticipation eliminates the need to set the heat anticipation
− Five minute compressor off delay, four minute minimum equipment run time − Monitors
compressor run time and heating time in hours and cycles to aid in system diagnostics. −
Optional Outdoor Temperature sensor is available. − Provides 24VAC control for single−stage
electric, gas or oil furnaces, single−stage intermittent ignition gas furnaces with or without vent
dampers, single−stage cooling systems. 2 cool models may also be used for systems with
two, single−stage compressors or one, two−speed compressor. − Not for use with multi−stage
heat systems, systems above 30VAC, heat pump systems, or millivolt systems. − Automatic or
manual changeover. − System Switch: Off−Heat−Cool−Auto − Fan Switch: On−Auto − Requires
the HOT and COMMON sides of the 24 VAC transformer be wired to the subbase. − Dimensions
(H x W x D): 5−7/8 x 4−1/2 x 1−7/8 in. (149 x 114 x 48 mm) − Four programmable time periods
per day − a total of 28 for the week. − Program is retained in permanent memory until it is either
erased or overwritten (no batteries required). The clock may need to be reset after a power
interruption, but the program will remain intact.
Thermostat-Prog/1H/2C/7day − Extra−large, easy−to−read LCD. − Selectable Fahrenheit or
Celsius display. − Display flashes CHECK FILTER after 360 hours (adjustable) of accumulated
fan run time. − On two stage cooling models, the LCD displays low and high for first and second
stage cooling operation. − Intelligent Anticipation eliminates the need to set the heat anticipation
− Five minute compressor off delay, four minute minimum equipment run time − Monitors
compressor run time and heating time in hours and cycles to aid in system diagnostics. −
Optional Outdoor Temperature sensor is available. − Provides 24VAC control for single−stage
electric, gas or oil furnaces, single−stage intermittent ignition gas furnaces with or without vent
dampers, single−stage cooling systems. 2 cool models may also be used for systems with
two, single−stage compressors or one, two−speed compressor. − Not for use with multi−stage
heat systems, systems above 30VAC, heat pump systems, or millivolt systems. − Automatic or
manual changeover. − System Switch: Off−Heat−Cool−Auto − Fan Switch: On−Auto − Requires
the HOT and COMMON sides of the 24 VAC transformer be wired to the subbase. − Dimensions
(H x W x D): 5−7/8 x 4−1/2 x 1−7/8 in. (149 x 114 x 48 mm) − Four programmable time periods
per day − a total of 28 for the week. − Program is retained in permanent memory until it is either
erased or overwritten (no batteries required). The clock may need to be reset after a power
interruption, but the program will remain intact.