EMERSON 1F85U-22PR Universal Thermostat Installation Guide

: June 7, 2024
: Emerson

Table of Contents

SPECIFICATIONS
THERMOSTAT INSTALLATION
- WIRING
USING THE THERMOSTAT
TROUBLESHOOTING
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

EMERSON 1F85U-22PR Universal Thermostat

Optional Accessory: Wall Cover-Up Plate F61-2663, 6 3/4” W x 4 1/2” H

Thermostat Applications	Maximum Stages Heat/ Cool

Conventional Gas, Oil, Electric
(mV and 24V), Heat only, Cool only or Heat/Cool Systems| 2/2
Heat Pump (Air Source or Geothermal) with Aux. Heat| 2/1

MERCURY NOTICE: This product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury must not be discarded in household trash.
Refer to www.thermostat-recycle.orgfor information on disposing of products containing mercury.

SPECIFICATIONS

Electrical Rating:

Battery Power| mV to 30 VAC, NEC Class II, 50/60 Hz
Input-Hardwire| 20 to 30 VAC, NEC Class II, 50/60 Hz
Terminal Load| 1.5 A per terminal, 2.5A maximum all terminals combined
Setpoint Range| 45° to 99° F (7° to 37° C)
Rated Differentials (@ 6°F/ Hr):|

Fast

| Med|

Slow

Heat (Conventional Gas / Oil / Elect)|

0.5°F

| 0.75°F|

1.9°F

Cool (Central Air)|

0.9°F

| 1.2°F|

1.7°F

Heat Pump (Heat and Cool)|

0.9°F

| 1.2°F|

1.7°F

Heat Pump Aux|

0.5°F

| 0.75°F|

1.9°F

Operating Ambient| 32°F to +105°F (0° to +41°C)
Display Temperature Range| 32°F to +99°F (0 to 37°C)
Operating Humidity| 90% non-condensing maximum
Shipping Temperature Range| -20°F to + 150°F (-29° to +65°C)

THERMOSTAT INSTALLATION

WIRING

Refer to equipment manufacturer’s instructions for specific system wiring information. After wiring, see INSTALLER MENU for proper thermostat configuration. Wiring table shown are for typical systems and describe the thermostat terminal functions. Wiring will change when dedicated emergency heat is on (See Installer Menu #15).

Terminal Designations

|

Terminal Function

---|---

RC

| Power (24V) – Cooling

RH

| Power (24V) – Heating

O/B
6 (not shown) – 3 wire zone valve

| Reversing Valve or output for 3 wire zone valves Configurable as “O” or “B” Reversing Valve or 3 wire zone heat (power close)

Y

| 1st Stage Compressor (conventional or heat pump)

G

| Fan Relay

W/E

| 1st Stage Heat (conventional);
1st Stage Auxiliary Heat (heat pump) Can operate as Emergency Heat only (See Installer Menu #15)

C

| Common wire for 24V (optional with batteries)

L

| Heat Pump Malfunction / Diagnostic terminal (input signal requires common)

Y2

| 2nd Stage compressor (conventional only)

W2

| 2nd Stage Heat (Conventional)
Can operate as 1st Stage Auxiliary Heat (See Installer Menu #15)

Precautions

Do not exceed the specification ratings.
All wiring must conform to local and national electrical codes and ordinances.
This control is a precision instrument, and should be handled carefully. Rough handling or distorting components could cause the control to malfunction.

Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard.
Do not short out terminals on gas valve or primary control to test. Short or incorrect wiring will burn out thermostat and could cause personal injury and/or property damage.

To prevent electrical shock and/or equipment damage, disconnect electrical power to system, at main fuse or circuit breaker box, until installation is complete.

To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.
Do not allow the compressor to run unless the compressor oil heaters have been operational for 6 hours and the system has not been operational for at least 5 minutes.

To prevent changes that may affect system performance, this thermostat has an INSTALLER MENU and a USER MENU. The INSTALLER MENU provides access to every option, while the USER MENU provides access to items that will not affect system performance. To access the INSTALLER MENU press the Menu button for 8 seconds. The display will show item 05 in the table below. Use Next and Back to navigate through menu items. Press ▲ or ▼ to change a menu setting.

Installer Menu #
(Hold Me nu 8 Seconds)

| Description| Default Setting
(flashing icons)|

Settings
(Press ▲ **** or ▼)

---|---|---|---
| Outdoor Equipment: selects air conditioner (AC) or heat pump (HP ) equipment as well as the number of stage|

AC2

| AC0
AC1
AC2
HP1
| Indoor Equipment: selects whether
the equipment is a gas furnace, electric
furnace or fan only| EL2| FAN
GA1
GA2 (conventional only)
EL1
EL2 (conventional only)
| Dedicated Emergency: W/E only
operates in Emergency Aux mode. W2
becomes 1st stage Aux. Heat|

OFF

OFF

OFF

| On – 5 minute delay
OFF – no delay
| Ma x Heat Limit : maximum set point for heat mode| 99| 47 to 99
| Minimum Cool Limit : minimum set point for cool mode| 45| 45 to 97
| Schedule Type: set as either 7-Day,
5-1-1 Day or Non-Programmable| 5| 7 – 7 Day
5 – 5-1-1 Day
0 – Non Programmable
| Defines periods per day| 4| 2 -leave, return
4 -wake, leave, return, sleep
| Early Start: starts heating or
cooling early so your programmed
temperature is reached by the
programmed time|

OFF

TEST EQUIPMENT Turn on power to the system.

Fan Operation

If your system does not have a G terminal connection, skip to Heating System.

Press the fan button to select the On position. The blower should begin to operate.
Press the fan button to select the Auto position. The blower should stop immediately.

Heating System

Press the System button to select the Heat position. Heat Pumps only – if the auxiliary heating system has a standing pilot, be sure to light it.
Press ▲ to adjust thermostat setting to 1° above room temperature. The heating system should begin to operate and the thermostat will indicate Heat On.
For heat pump with auxiliary- Press ▲ to adjust thermostat setting to 3° above room temperature. The auxiliary heat should begin to operate and the thermostat will indicate Heat On Aux.
Press ▼ to adjust thermostat setting 1° below room temperature. The heating system should stop operating and the Heat On icon will disappear.

Auxiliary System ( only for heat pumps with auxiliary)

Press the System button to select the Aux position.
Press ▲ to adjust thermostat setting to 1° above room temperature. The auxiliary heating system should begin to operate and the thermostat will indicate Heat On Aux.
Press ▼ to adjust thermostat setting 1° below room temperature. The auxiliary heating system should stop operating and the Heat On Aux icon will disappear.

Cooling System

Press the System button to select the Cool position.
Press ▼ to adjust thermostat setting 1° below room temperature. The blower should come on immediately on high speed, followed by cold air circulation. The thermostat will indicate Cool On. There can be up to a 5 minute delay. (see INSTALLER MENU, item 50)
Press ▼ to adjust thermostat setting to 1° above room temperature. The cooling system should stop operating and the Cool On icon will disappear.
Note: If Starting Soon is shown on the display, the compressor lockout feature is operating. There will be up to a 5 minute delay before the compressor turns on (see INSTALLER MENU, item 50).

USING THE THERMOSTAT

THERMOSTAT OVERVIEW

Before you begin using your thermostat, you should be familiar with its features, display and the location/operation of the thermostat buttons and switches.

THERMOSTAT BUTTONS AND SWITCHES	THE DISPLAY
1.) Fan Button	8.) Next (Menu button) is used to navigate within a menu

2.) Hold a permanent temperature or press again to cancel hold (return to programmed schedule)| 9.) Set the correct time, access the schedule and customize thermostat settings
3.) System Button| 10.) Back (Fan button) is used to navigate within a menu
4.) Backlight Button (located on the top of the thermostat)| 11.) Exit (Hold/Run button) returns to the home screen
5.) Raises Temperature Setting| 12.) Thermostat is protecting the equipment from short cycling (5-minute delay)
6.) Access Menu Options| 13.) Indicates that the system is running in Cool, Heat or Auxiliary mode. (Heat Pump Only -The auxiliary will run in Heat mode when the heat pump cannot maintain the set temperature.)
7.) Lowers Temperature Setting| 14.) SEE TROUBLESHOOTING
| 15.) Battery status indicator
16.) Replace battery indicator
17.) Day of the week used when programming a schedule
18.) Permanent hold (bypassing the schedule)
19.) Temperature setpoint
20.) Appears when the keypad is locked (to prevent unwanted changes)

Whenever”” appears in the display, new premium brand AA alkaline batteries should be installed. If the house will be unoccupied for an extended period and either “ ” or “ ” is displayed, install new batteries before leaving.

To customize thermostat settings, press and hold the Menu button for ½ second from the home screen. Use the ▲ or ▼ buttons to highlight Settings and press Next. Use Next and Back to navigate through menu items. Press ▲ or ▼ to change the setting.

User’s Menu # (Press Menu button and release)| Description| Default Setting
(flashing icons)| Settings
(Press ▲ or▼ )
---|---|---|---
| Schedule Type: set as either 7-Day, 5-1-1 Day or Non Programmable| 5| 7 – 7 Day
5 – 5-1-1 Day
0 – Non-Programmable
| Defines periods per day| 4| 2 – leave, return
4 – wake, leave, return, sleep
| Early Start: starts heating or cooling early so your programmed temperature is reached by the programmed time| OFF| On – start early
OFF – start at program period time
| Fan Circulation Mode: Turns blower on for present time period when equipment has not cycled (on) for 1 hour| OFF| 10 minutes to 100 minutes in 5 minute increments
| Continuous Display Light: keep the backlight always on – “C” wire required| OFF| On – always on
OFF – momentarily
| Change Air Filter: set up a monthly reminder| OFF| 1 to 12 – reminder time (months)
OFF – no filter reminder
| Auto-Changeover: thermostat automatically switches between heat and cool| OFF| On – enable auto|
OFF – disable auto

THERMOSTAT OPERATION

Set Current Time and Day
Note: Time icons will flash at initial power up or after a reset.

Press Menu
The time icon will be flashing. Press Next to advance and set the time
Use ▲ or ▼ to set the correct time
Press Next and use ▲ or ▼ to set the correct day
Press Exit when finished.

The default program is 5-1-1 Day, but can be setup as a 7-Day or Non-Programmable thermostat (refer to the User Menu above).

Hold Temperature (bypassing the schedule) – With the System set to Heat or Cool, momentarily press the Hold/Run button. Hold will be displayed. Use ▲ or ▼ to adjust the temperature. The thermostat will hold the room temperature at the selected setting until you press Hold/Run again to start program operation (cancels permanent Hold).
Program Override (Temporary Hold) – Press ▲ or ▼ until the desired temperature is displayed. The thermostat will override the schedule until the next programmed time period with a minimum override of 2 hours. Then the thermostat will automatically revert to the program.
Keypad Lockout – To prevent unwanted changes, the buttons can be disabled.
To turn this feature On, press and hold ▲ and the Menu button until the icon appears. To turn Off, press and hold ▲ and the Menu button for 3 seconds.

THERMOSTAT SCHEDULE / PROGRAMMING

Energy Saving Factory Schedule
This thermostat is programmed with the energy saving settings shown in the table below for all days of the week

Energy Saving Factory Schedule
This thermostat is programmed with the energy saving settings shown in the table below for all days of the week.

| P 1 / Wake| P 2 / Leave| P 3 / Return| P 4 / Sleep
---|---|---|---|---
Heating Schedule| 6:00 AM – 70°F| 8:00 AM – 62°F| 5:00 PM – 70°F| 10:00 PM – 62°F
Cooling Schedule| 6:00 AM – 78°F| 8:00 AM – 85°F| 5:00 PM – 78°F| 10:00 PM – 82°F

Note: Thermostat can be programmed on or off the subbase

Modify the Heating Schedule

Use the System button to select Heat
Press Menu
Use the ▼ button to select Schedule and press Next to enter the schedule
The time icons will flash – use ▲ or ▼ to set the time for the start of a period
Press Next – the set point icons will flash – use ▲ or ▼ to set the temperature for the current period
Continue to press Next to advance through all periods (P1 / Wake, P2 / Leave, P3 / Return, P4 / Sleep) for all days of the week.

Note: Press Back to return to the previous setting. Once all days of the week have been programmed the thermostat will display End. Press Exit at any time to save changes and return to home screen.

Modify the Cooling Schedule

Use the System button to select Cool
Repeat steps 2-6 from the heating schedule

TROUBLESHOOTING

Symptom	Possible Cause	Corrective Action

No Heat/ No Cool/ No Fan

(common problem)

|

Blown fuse or tripped circuit breaker
Furnace power switch to OFF
Furnace blower compartment door panel loose or not properly installed
Loose connection to thermostat or system

|

Replace fuse or reset breaker
Turn switch to ON
Replace door panel in proper position to engage safety interlock or door switch
Tighten Connections

No Heat|

System not set to Heat
Loose connection to thermostat or system
Heating System requires service or thermostat requires replacement

|

Set thermostat to Heat.
Verify thermostat and system wires are securely attached.
Diagnostic: Set System to Heat and raise the setpoint above room temperature. Within five minutes the thermostat should make a soft click sound and “Heat On” should appear on display. This sound indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed below. If the thermostat does not click after being reset, contact your heating and cooling service person or place of purchase for a replacement. If the thermostat clicks, contact the furnace manufacturer or a service person to verify the heating system is operating correctly.

No Cool|

System not set to Cool
Loose connection to thermostat or system
Cooling System requires service or thermostat requires replacement

|

Set thermostat to Cool.
Verify thermostat and system wires are securely attached.
Diagnostic: Set System to Cool and lower setpoint below room temperature. Same procedures as diagnostic for “No Heat” condition except set the thermostat to Cool and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling if the compressor lock-out option is selected in the installer menu. (see INSTALLER MENU, item 50)

Heat, Cool or Fan Runs Constantly|

Possible short in wiring, thermostat, heat, cool or fan system

| Check each wire connection to verify they are not shorted or touching other wires. Try resetting the thermostat. If the condition persists contact your HVAC service person.
Thermostat Display & Thermometer Disagree| Thermostat display requires adjustment| Display can be adjusted +/-5°. See User Menu item 05
Furnace (Air Conditioner) Cycles Too Fast or Slow

(narrow or wide temperature swing)

| The location of the thermostat and/or the size of the Heating System may be influencing the cycle rate| Digital thermostats provide precise control and cycle faster than older mechanical models. The system turns on and off more frequently, but runs for a shorter time. If you would like to increase cycle time, choose SLO for slow cycle in the Installer menu. (Reference menu items 30, 32 & 35.) If an acceptable cycle rate is not achieved, contact your HVAC service person.
“Call for Service” icon appears on displayed|

Heating system is not able to heat the space to within 10 degrees of the setpoint within 2 hours
Cooling system is not able to cool the space to within 10 degrees of the setpoint within 2 hours
If “–” is displayed for the Room Temperature, a replacement thermostat is needed
None of the buttons operate on the thermostat
If “Call for Service” is flashing, com- pressor self diagnostic is detecting an issue with the outdoor unit

|

See corrective action for “No Heat”
See corrective action for “No Cool”
Replace thermostat
Make sure keypad lockout is not turned on ( ), If it’s OFF, try reset shown below.
Contact a service person to verify the outdoor equipment is operating correctly

Resetting the Thermostat or Thermostat Settings

If the thermostat has good batteries, but has a blank display or does not respond to key presses, the thermostat should be reset by removing the batteries for 2 minutes. This reset will not change the menu settings or program. If the condition persists after reinstalling the batteries, replace the thermostat.

To conveniently reset only the schedule and user settings back to factory defaults, press Menu and Backlight buttons at the same time and hold until the display goes blank and resets.