Emerson 1F85U-22NP Non-Programmable Thermostat
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.org for 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 Dimensions………………………. 3-3/4” H x 6” W x 1-1/8” D
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
RC/RH Jumper Wire
This thermostat electrically connects the RC and RH terminals so a jumper wire is not required. If the application provides a separate wire for RC and RH, clip the RC/RH jumper. This will isolate both terminals so they can be independently used.
Battery Location
Premium AA alkaline batteries are required when C-wire is not available. When C-wire is available, the batteries provide a back-up source of power (this will maintain the clock in the event of a power outage).
INSTALLER MENU
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 
to change a menu setting.
| Installer Menu #
(Hold Menu 8 Seconds) |
Description | Default Setting
(flashing icons) |
Settings
(Press |
| 05 | Outdoor Equipment: selects air conditioner (AC) or heat pump (HP) equipment as well as the number of stage |
AC2 |
AC0 AC1 AC2 HP1 |
| 10 |
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) |
15 |
Dedicated Emergency: W/E only operates in Emergency Aux mode. W2 becomes 1st stage Aux. Heat |
OFF |
On OFF |
20 |
O,B or 3 Wire Zone Valve Selection |
O |
O B 3 |
25 |
Circulation Fan Mode: Allows user to set fan circulation time when equipment has not cycled for 1hr. |
OFF |
10 minutes to 100 minutes in 5 minute increments |
30 |
Heat Cycle Rate: how often the heat will turn on |
MEd |
SLO – slow MEd – medium FAS – fast |
| 32 |
Aux Cycle Rate: how often the auxiliary heat will turn on |
MEd |
SLO – slow MEd – medium FAS – fast |
| 35 |
Cool Cycle Rate: how often the cooling will turn on |
MEd |
SLO – slow MEd – medium FAS – fast |
| 50 |
Compressor Lockout:
protects the compressor from short cycling |
OFF |
On – 5 minute delay
OFF – no delay |
| 65 | Max Heat Limit: maximum set point for heat mode | 99 | 47 to 99 |
| 66 | Minimum Cool Limit: minimum set point for cool mode | 45 | 45 to 97 |
| Installer Menu #
(Hold Menu 8 Seconds) |
Description | Default Setting
(flashing icons) |
Settings
(Press or ) |
| 79 | Fahrenheit or Celsius | °F | °F – Fahrenheit
°C – Celsius |
| 81 | Temperature Display Adjustment: adjust the displayed “Room Temperature” |
0 |
-5 to +5 |
83 |
Continuous Display Light: keep the
backlight always on – “C” wire required |
OFF | On – always on
OFF – momentarily |
| 88 | Auto Changeover: thermostat automatically switches between heat and cool |
OFF |
On – enable auto
OFF – disable auto |
99 |
Keypad Lock: prevent unwanted changes to the thermostat | OFF | On – disable buttons
OFF – all buttons are active |
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 pumps 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. This bypasses the heat pump and runs auxiliary only heat.
- 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
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.) Away Button (set a frequently used temperature) | 9.) Back (Fan button) is used to navigate within a menu |
| 3.) System Button | 10.) Exit (Away button) returns to the home screen |
| 4.) Backlight Button (located on the top of the thermostat) | 11.) Thermostat is protecting the equipment from short cycling (5-minute delay) |
| 5.) Raises Temperature Setting | 12.) 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.) |
| 6.) Access Menu Options | 13.) SEE TROUBLESHOOTING |
| 7.) Lowers Temperature Setting | 14.) Battery status indicator |
| 15.) Replace battery indicator | |
| 16.) Temperature setpoint | |
| 17.) Appears when the keypad is locked (to prevent unwanted changes) |
USER MENU
To customize thermostat settings, press and hold the Menu button for ½ second from the home screen. Use the buttons to highlight Settings and press Next. Use Next and Back to navigate through menu items. Press to change the setting.
| User’s Menu # (Press Menu button and release) |
Description |
Default Setting
(flashing icons) |
Settings
(Press or ) |
| 01 | Fahrenheit or Celsius | °F | °F – Fahrenheit
°C – Celsius |
| 02 | Temperature Display Adjustment: adjust the Room Temperature |
0 |
-5 to +5 |
| 03 | Continuous Display Light: keep the backlight always on – “C” wire required |
OFF |
On – always on
OFF – momentarily |
| 04 | Auto-Changeover: thermostat automatically switches between heat and cool |
OFF |
On – enable auto
OFF – disable auto |
THERMOSTAT OPERATION
- Away – Stores a frequently used temperature setting so that you can select it with a touch of the Away button. To set an Away temperature press temp up or temp down to the temperature you want. At the desired setting, hold the Away button for 3 seconds. When the setting is stored the set point will flash one time. You can store an Away setting for both Cool and Heat modes. (Example: Set an Away temperature to 88°F in the summer for cooling and 55°F in the winter for heating.)
- 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 (this can also be turned on in the menu). To turn it Off, press and hold and the Menu button for 3 seconds.
TROUBLESHOOTING
| Symptom | Possible Cause | Corrective Action |
|
No Heat/ No Cool/ No Fan (common problem) |
1.) Blown fuse or tripped circuit breaker
2.) Furnace power switch to OFF 3.) Furnace blower compartment door panel loose or not properly installed 4.) Loose connection to thermostat or system |
1.) Replace fuse or reset breaker
2.) Turn switch to ON 3.) Replace door panel in proper position to engage safety interlock or door switch
4.) Tighten Connections |
|
No Heat |
1.) System not set to Heat
2.) Loose connection to thermostat or system 3.) Heating System requires service or thermostat requires replacement |
1.) Set thermostat to Heat.
2.) Verify thermostat and system wires are securely attached. 3.) 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 |
1.) System not set to Cool
2.) Loose connection to thermostat or system 3.) Cooling System requires service or thermostat requires replacement |
1.) Set thermostat to Cool.
2.) Verify thermostat and system wires are securely attached. 3.) 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. |
| Symptom | Possible Cause | Corrective Action |
|
“Call for Service” icon appears on displayed |
1.) Heating system is not able to heat the space to within 10 degrees of the setpoint within 2 hours
2.) Cooling system is not able to cool the space to within 10 degrees of the setpoint within 2 hours 3.) If “–” is displayed for the Room Temperature, a replacement thermostat is needed 4.) None of the buttons operate on the thermostat 5.) If “Call for Service” is flashing, compressor self diagnostic is detecting an issue with the outdoor unit |
1.) See corrective action for “No Heat” 2.) See corrective action for “No Cool” 3.) Replace thermostat
4.) Make sure keypad lockout is not turned on ( ), If it’s OFF, try reset shown below. 5.) Contact a service person to verify the outdoor equipment is operating correctly |
WHITE REODGERS
- Emerson and White-Rodgers are trademarks of Emerson Electric Co. ©2020 Emerson Electric Co. All rights reserved.
- HOMEOWNER HELPLINE: 1-800-284-2925
- emerson.com/white-rodgers
REFERENCE
DOWNLOAD MANUAL
Emerson 1F85U-22NP Non-Programmable Thermostat Instruction Manual
Emerson 1F85U-22NP Non-Programmable Thermostat Instruction Manual