1)This control can be configured for:
MS 2 – Multi-Stage System (no heat pump)
HP 1 – Heat Pump with one stage of compressor HP 2 – Heat Pump with two stage compressor or two compressor system, Gas or Electric backup
SS 1 – Single Stage System
2)GAS or Electric (ELE) fan operation. If the heating system requires the thermostat to energize the fan, select ELE. Select GAS if the heating system energizes the fan on a call for heat.
3)Select Cool Savings™ value – Selects the amount of adjustment for the Cool Savings™ feature in Cool mode with 1 (1°) being the least amount of adjustment and 6 (6°) being the most amount of adjustment. Default value is 3. Cool Savings is an optional energy saving feature that can reduce your cooling costs. It is based on the principal that lower indoor humidity makes a slightly higher temperature feel more comfortable. Cool Savings operates during periods of high demand which normally occur onthe hottest summer days when a cooling system may run for hours to reach the thermostat setting. Long cooling run times also lower the indoor humidity. Cool Savings, very slowly, adjusts the setpoint temperature to make the setpoint closer to the displayed room temperature, to a maximum of the number of degrees you select. Adjusting the setpoint temperature over a long cooling run time allows the system to reach your set temperature and turn off. The room temperature will actually be higher than the thermostat displays but the reduction in humidity will allow comfort at the slightly higher temperature.
To turn this feature on in the Cool mode press Cool Sav- ings. The display will show “Save” next to the setpoint temperature. When Cool Savings is making adjustments to the room temperature display “Save” will be flashing and the displayed room temperature may vary within the adjust- ment range you selected.
If "Save" is not displayed and this feature is OFF, no change will occur when the cooling system is continuously running during periods of high demand.
4)Energy Management Recovery: (this step is skipped if configured to be non-programmable).
Energy Management Recovery (E) On enables the ther- mostat to start heating or cooling early to make the building temperature reach the program setpoint at the time you specify. Heating will start 5 minutes early for every 1° of temperature required to reach setpoint.
Example: E On is selected and your heating is pro- grammed to 65° at night and 70° at 7 AM. If the building temperature is 65°, the difference between 65° and 70° is 5°. Allowing 5 minutes per degree, the thermostat setpoint will change to 70° at 6:35 AM. Cooling allows more time per degree, because it takes longer to reach set temperature.
5, 6 & 7) Cycle Rate Selection – The factory default setting for Heat and Cool modes, SS1, MS2, is medium cycle (ME). For Heat Pump, HP1, HP2, the default setting is medium (ME). For Emer (Aux) the default setting is fast cycle
(FA).To change cycle rate, press the 
or 
key. Cycle rate differentials for different settings are:
| MODE | Fast | Medium | Slow |
| FA | ME | SL |
| | |
| Heat | (SS1, MS2) | 0.4°F | 0.6°F | 1.7°F |
| Cool | (SS1, MS2) | 0.9°F | 1.2°F | 1.7°F |
| Heat Pump (HP1, HP2) | 0.9°F | 1.2°F | 1.7°F |
| Emer (HP1, HP2) | 0.6°F | - | 1.7°F |
8)Select Compressor Lockout CL OFF or ON – Selecting CL ON will cause the thermostat to wait 5 minutes between cooling cycles. This is intended to help protect the compres- sor from short cycling. Some newer compressors already have a time delay built in and do not require this feature. Your compressor manufacturer can tell you if the lockout feature is already present in their system. When the thermostat compressor time delay occurs, it will flash the
setpoint for up to five minutes.
9)System Mode Configuration – This thermostat is config- ured for Heat and Cool (SYSTEM switch with Cool Off Heat) default. It can also be configured for Heat and Cool with Auto changeover (Heat, Auto, Cool, Off), Heat only with fan (Off Heat), Heat only without fan, Auto only (Auto Off), and Cool only (Cool Off).
10)Select Backlight Display – The display backlight improves display contrast in low lighting conditions. When the "C" terminal is powered, selecting backlight CdL ON will keep the light on continuously. Select backlight OFF will turn the light on momentarily after any key is pressed. When the "C" terminal is not powered, the light will be on momen- tarily after any key is pressed no matter whether the backlight is selected ON or OFF.
11)Select Temperature Display Adjustment 4 LO to 4 HI – Allows you to adjust the room temperature display up to 4° higher or lower. Your thermostat was accurately calibrated at the factory, but you have the option to change the dis- play temperature to match your previous thermostat. The current or adjusted room temperature will be displayed.
12)Select F° or C° Readout – Changes the display readout to Centigrade or Fahrenheit as required.
13)Program Options: 1F85 only, configured for 5/1/1 day or 5/2 day programming or non-programming mode.
The default setting is P2, indicating 5/2 day programming. The programs per week can be toggled to P3 or P0 by
pressing the 
or 
keys. A selection of 0 Days for non-programmable will eliminate the need for EMR, and that step in the menu will be skipped.
14 & 15) Select Automatic Schedule – 1F85 only, with just one touch of the Auto Schedule key this feature allows you to program a desired comfort temperature into all the program periods along with a 6° set back for night periods of both Heat and Cool programs. Factory default is "On" for both. When Heat AS On and Cool AS On are activated while in Heat or Cool mode, select desired setpoint tem- perature and press Auto Schedule. This value will be copied into all the morning, day and evening program periods. The night program periods will have a 6°F set back.
16 & 17) Select Fast Second Stage ON or OFF – Heat pump or Multi-stage only, in the run mode, with the fast Heat feature enabled (FA Heat On), if the Heat setpoint tem- perature is manually raised by 3°F (2°C) or more above
the actual temperature using 
the second stage will energize immediately. With FA OFF, second stage will not energize until the setpoint temperature is 1°F or more above actual temperature for more than ten minutes. The Fast Cool feature (FA Cool) provides the same controls when the setpoint temperature is lowered.
18)Select Daylight Saving Time Calculation – 1F85 only, this feature will allow the thermostat to calculate the DST automatically and apply it to the Real Time Clock display.
Default On. Use 
or 
touch keys to select the feature OFF.
19)Select Filter Replacement Reminder and Set Run Time Select the "Change Filter" reminder On or OFF. If selec- ted On, press MENU to select the time period from 25 to 1975 hours in 25 hours increments. In a typical system, 200 hours (default) of run time is approximately 30 days. After the selected time of blower operation, the thermostat will display "Change Filter" as a reminder to change or clean your air filter. When "Change Filter" is displayed, press MENU or RUN SCHED button to clear the display and restart the time to the next filter change.
20)Select Reversing Valve Output – The O/B option is factory set at "O" position. This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in COOL. If the thermo- stat you are replacing or the heat pump being installed with this thermostat requires a "B" terminal, to energize the changeover relay in HEAT, the O/B option should be set at "B" position.
