1. Homeowner Support Hotline:
Education
Central
Engage, Apply, Retain
2” Series
Thermostats
Homeowner Support Hotline:
Note: This module covers common elements. Refer to Specification Sheet or Installation Instructions for detailed information.

2. Emerson 2” Thermostat Selecting the Right Thermostat for the Job
Application Coverage by System
Model
Stages Heat / Cool by System
Applications
Programming Options
Power Source
Single Stage (SS) Multi-Stage (MS) Heat Pump (HP1 or HP2) Universal (All)
Model Number
Single Stage
Multi-Stage
Heat Pump
Gas/Oil/Electric
3-Wire Zone Value
Millivolt Compatible
Humidity Control
Program Days per Week
Program Periods per Day
Hardwire Battery
Power Assist
Single Stage / Heat Pump 1F
1/1 ✓
5+1+1 4
B,H 1F
24 Hours 1F
2/1
1F86EZ Easy Set Ø
3 Presets 1F
1F89EZ Easy Set 1F

3. 2” Series Thermostats Agenda
Applications
Wiring
Configuration
Programming
Featured Products In This Module 1F
Single Stage / Programmable 1F
Multi Stage / Programmable
1F86EZ-0251
Single Stage, with 3 Presets
1F89EZ-0251
Multi Stage / with 3 Presets

4. Look at the Box for Detailed Information
Staging By System Type
Programming Options
Applications
Terminal Identification
Part Number

5. 2” Series Thermostat Overview
Single Stage or Two Stage Heat Pump
Easy-to-Read 2-Square-Inch Blue Display
Comfort Alert™ Compressor Protection
Battery Power Monitor
Choice of Programmable or Non-Programmable
Easy Set has 3 Pre-Sets: Home-Sleep-Away
+/-1 Degree Accuracy- For Optimum Comfort and Equipment Life

6. 2” Series Specification Sheets Contain Detailed Information

7. Conventional or Heat Pump with No Aux
2” Series Applications
Application
Stages
Programming
Type
Conventional or Heat Pump with No Aux
1/1 1F
5+1+1 1F
3 Presets
1F86EZ-0251
24 Hr 1F
Heat Pump Only With Aux
2/1 1F 1F
1F89EZ-02511

8. HP Only With Aux/Emer **
Emerson 2” Series Terminal Designations
2" Series
Conventional
Heat Pump
CONV or HP with No Aux*
HP Only With Aux/Emer **
Terminal
Description 1F 1F
1F86EZ-0251 1F 1F 1F
1F89EZ-0251
Programming
5+1+1
3 Presets
24 Hour
Stages
1/1
2/1 W
1st. Stage Heat ● W2
Aux Heat 1st Stage for HP Y
1st Stage Compressor
O/B
Reversing Valve Combined G
Fan Relay R
24 VAC Hot (TH) C
24 VAC Common (TR) Wire L
Diagnostics
Note:
* Requires Field Wiring from Y to W for Heat Pump
** Heat Pump Only Y is 1st Stage

9. Batteries
Two “AA” alkaline batteries are installed in your thermostat with a battery tag to prevent power drainage. Prior to use, open the battery door and remove the battery tag. To open, pull the battery door as shown by the arrow and lift open
Thermostat can be powered by system AC power or Battery. If is displayed, the thermostat is battery powered. If is not displayed, thermostat is system powered with optional battery back-up
When “Change ” is displayed, install fresh “AA” alkaline batteries immediately.
NOTE: When less than two months of battery life remain, the set point temperature will offset by 10 degrees (10 degrees cooler in Heat mode / 10 degrees warmer in Cool mode). If offset occurs, the normal setpoint can be manually reset with UP or DOWN button . Another offset will occur within two days if batteries are not replaced.

10. 2” Series Application Selection Switches
FAN (GAS/ELEC Switch) Fan Operation
GAS position lets the equipment operate the fan on a call for heat
ELEC position lets the thermostat operate the fan on a call for heat—you will use this position for heat pumps or electric furnaces.
O/B (Reversing Valve Switch)
When used on a heat pump determines if reversing is energized in cooling “O” or energized in heating “B”
1F80/1F86
1F82/1F89
These switches are on the back of the thermostat and must be configured correctly for the application

11. Typical Single Stage Wiring
Field Installed Jumper option to convert 1F80 and 1F89 to a single stage heat pump with no auxiliary heat
NOTE: The 2” Series uses a push in wire block, not screw terminals

12. Two Transformer, No Safety Circuits
Polarity MUST be correct. If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer a short will be made and damage will occur

13. Two Transformer
Polarity MUST be correct. If the HOT side of the second transformer is jumpered to the COMMON side of the first transformer a short will be made and damage will occur

14. 2” Series Navigation Day of Week Actual Room Temperature
Time of Day
Heat/Cool/Off
Button
Fan Auto/On or
Run Sched Button
Battery Status
= Full Charge
= Half Capacity
= Replace Batteries
Temperature or Config
Adjustment Buttons
Actual Room Temperature
Desired Temperature

15. 2” Series Entering System Configuration
2. Press the Up and Down button simultaneously
Most technical service calls are the result of improper system configuration
1. System must be in OFF Mode

16. Press Δ or  to Select From Listed Options
2” Series Configuration
Record settings of key items for Homeowner Reference
Menu #
Displayed (Default)
Press Δ or  to Select From Listed Options
Comments 1 SS HP
Selects Single Stage (SS) or Heat Pump (HP, 1 compressor) 2 CS
(OFF) On
Select Cool Savings Feature On or OFF
(3)
1, 2, 3, 4, 5, 6
If CS selected On, selects Cool Savings value 3 E
(On)
OFF
Select Energy Management Recovery 4
CR Heat
(ME)
FA, SL
Select Adjustable Anticipation, Cycle Rate, Heat Single Stage 5
CR Cool
(FA) SL
Select Adjustable Anticipation, Cycle Rate, Cool Single Stage 6 CL
Select Compressor Lockout OFF or On 7 L
Off
Select Display Light On or OFF 8
Temp
(0 HI)
4 LO to
4 HI
Select temperature display adjustment higher or lower 9 F C
Select F/C Display 10
Change Filter
Select Filter replacement indicator OFF or On
(200 h)
25 to 1975
If Change Filter selected On, selects time interval for Change Filter Indicator (in 25 hour increments) 11
Returns to normal operation

17. 2” Series Programming Worksheet
Technical Service has never spoken to anyone who could not program the thermostat once they filled out the schedule worksheet in the manual and KEPT it.
Save a call back and fill it out the form from the homeowners manual with the homeowner. Ensure they have the Homeowner Support Hotline:

18. 2” Thermostat Buttons and Switches
TIME button.
SYSTEM switch (COOL, OFF, HEAT, EMER)
PRGM (program) button.
FAN switch (ON, AUTO).
RUN/HOLD (program) button.
Raises temperature setting.
Lowers temperature setting. 6 7 1 5 3 2 4
NOTE: TIME, PRGM and RUN/HOLD buttons not on non-programmable models.

19. 2” Series Set Time and Day
Set Current Time and Day
Press TIME button once. The display will show the hour only
Press and hold either UP or DOWN until you reach the correct hour and AM/PM designation (AM begins at midnight; PM begins at noon)
Press TIME once again. The display window will show the minutes only.
Press and hold either UP or DOWN until you reach the correct minutes.
Press TIME once again. The display will show the day of the week.
Press UP or DOWN until you reach the current day of the week.
Press RUN/HOLD once. The display will show the correct time, day, room temperature and set-point temperature.

20. 2” Series How To Set A Program
Move the SYSTEM switch to Heat or Cool
Press PRGM once. “Mo Tu We Th Fr” (indicating weekday program) will appear in the display.
Press UP or DOWN to change the displayed temperature to your selected temperature for the 1st program period.
Press TIME once (the programmed time will flash). Press UP or DOWN until your selected time appears. The time will change in 15 minute increments. When your selected time is displayed, press TIME again to return to the change temperature mode.
Press PRGM once. The currently programmed start time and setpoint temperature for the 2nd program period will appear.
Repeat steps 3 and 4 to select the start time and temperature for the 2nd program period.
Repeat steps 3 through 5 for the 3rd and 4th program periods.
Press PRGM once. “SA” (indicating Saturday program) will appear in the display, along with the start time for the 1st period and the currently programmed temperature.
Repeat steps 3 through 7 to complete Saturday programming.
Press PRGM once to change to SU (Sunday) programming and repeat steps 3 through 7 to complete Sunday programming.
When you have completed entering your program ,press RUN/HOLD.