EMERSON 1F75C-11NP Non Programmable Single Stage Thermostat User Manual
- August 23, 2024
- Emerson
Table of Contents
EMERSON 1F75C-11NP Non Programmable Single Stage Thermostat
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 ……………………………………. 1.0 A per terminal, 1.5A maximum all terminals combined
- Setpoint Range ………………………………….. 45° to 99° F (7° to 37° C)
- Rated Differentials: Fast Med Slow
- Heat (@ 6°F/ Hr) …………………………….. 0.5°F 0.75°F 1.9°F
- Cool (@ 6°F/ Hr) …………………………….. 0.9°F 1.2°F 1.7°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 max
- 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
- 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| 1/1
Heat Pump (air source or geothermal) with no Aux. Heat| 1/1
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.org for information on disposing of products containing mercury.
FAQs
- Q: What should I do if my thermostat malfunctions?
- A: If your thermostat malfunctions, check the wiring and ensure it is correctly configured based on the manufacturer’s instructions. If issues persist, contact the Homeowner Help Line for further assistance.
- Q: How do I know if my system requires battery power or hardwiring?
- A: Refer to the system specifications to determine whether battery power or hardwiring is required. In case of uncertainty, consult a professional HVAC technician for guidance.
THERMOSTAT INSTALLATION
WIRING
Refer to the equipment manufacturer’s instructions for specific system wiring
information. After wiring, see INSTALLER MENU for proper thermostat
configuration. The wiring table shown is for typical systems and describes the
thermostat terminal functions.
| Terminal Designations | Terminal Function |
|---|---|
| RC* | Power for Cooling |
| RH* | Power for Heating |
| O/B | Changeover Terminal-Energized in Heat (B) or Cool (O) for Heat Pump or |
Damper Systems
Y| Cooling Relay
G| Fan Relay
W| Heating Relay
C| Common wire for 24V (optional with batteries)
When both RC and RH wires are present, cut the RC/RH jumper (see next page). For heat pump systems, add a jumper wire to connect terminals Y and W
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.
WARNING
- Do not use on circuits exceeding specified voltage.
- Higher voltage will damage control and could cause shock or fire hazards.
- Do not short out terminals on the gas valve or primary control to test.
- Short or incorrect wiring will burn out the thermostat and could cause personal injury and/or property damage.
CAUTION
- To prevent electrical shock and/or equipment damage, disconnect electrical power to the system, at the main fuse or circuit breaker box, until installation is complete.
- Gas/Elec Switch
- If the system is a heat pump or electric furnace, the GAS/ELEC Switch must be set to Elec. If your system is a gas or oil furnace, the switch must be set to Gas.
- O/B Terminal Switch
- The O/B switch on this thermostat is factory set to the O position. This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in Cool. If the heat pump being installed requires a B terminal, to energize the changeover relay in Heat, the O/B switch must be moved to the B position.
- 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.
INSTALLER MENU
- To access the INSTALLER’S MENU set the system switch to the OFF position and then press and hold the temperature and buttons for 3 seconds.
- The display will show item 30 in the table below.
- Use the temperature and buttons by pressing them simultaneously to navigate through menu items. Press or to change a menu setting.
(Installer Menu continued on next page)
Installer’s Menu # (Hold Menu 8 Seconds)| Description|
Default Setting (flashing icons)| Settings
---|---|---|---
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
TEST EQUIPMENT
- Turn on the power to the system.
Fan Operation
If your system does not have a G terminal connection, skip to the Heating
System.
- Move the fan switch to the On position. The blower should begin to operate.
- Move the fan switch to the Auto position. The blower should stop immediately.
Heating System
- Move the System Switch to the Heat position.
- Press to adjust the thermostat setting to 1° above room temperature. The system should begin to operate and the thermostat will indicate Heat On.
- Press to adjust the thermostat setting to 1° below room temperature. The heating system should stop operating and the thermostat should indicate Heat.
Cooling System
- Move the System Switch to the Cool position.
- Press to adjust the thermostat setting to 1° below room temperature. The blower should come on immediately at 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 the thermostat setting to 1° above room temperature. The cooling system should stop operating and the thermostat will indicate Cool.
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)
CAUTION
- 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.
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 Switch | 5.) The thermostat protects the equipment from short cycling |
(5-minute delay)
2.) System Switch| 6.) Indicates that the system is running in cool or heat
3.) Raises Temperature Setting| 7.) Battery status indicator
4.) Lowers Temperature Setting| 8.) Low battery indicator
| 9.) Temperature setpoint
| 10.) Press and hold temp up down to access Menu
| 11.) SEE TROUBLESHOOTING
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.
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.) The furnace blower compartment door panel is loose or not properly installed
4.) Loose connection to thermostat or system
| 1.) Replace fuse or reset breaker
2.) Turn the switch to ON
3.) Replace the door panel in the proper position to engage the safety interlock or door switch
4.) Tighten Connections
No Heat| 1.) System Switch not set to Heat
2.) Loose connection to thermostat or system
3.) The Heating System requires service or the thermostat requires replacement
| Verify thermostat and system wires are securely attached.
Diagnostic: Set the System Switch 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 Switch not set to Cool
2.) Loose connection to thermostat or system
3.) The Cooling System requires service or the thermostat requires replacement
| Verify thermostat and system wires are securely attached.
Diagnostic: Set the System Switch to Cool and lower the setpoint below room temperature. The 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 the 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| The thermostat display requires
adjustment| The display can be adjusted +/-5°. See User Menu item 04
Symptom| Possible Cause| Corrective Action
---|---|---
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 & 35) If an acceptable cycle rate is not achieved, contact your HVAC
service person.
“Call for Service” icon appears on the display| 1.) The heating system is not
able to heat the space to within 10 degrees of the setpoint within 2 hours
2.) The 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
| 1.) See corrective action for “No Heat”
2.) See corrective action for “No Cool”
3.) Replace thermostat
4.) Make sure the keypad lockout is not turned on (denoted by the icon)
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. If the condition persists after reinstalling the batteries, replace the thermostat.
- To conveniently reset only the user settings back to factory defaults, press the temperature and buttons move the system switch from OFF to HEAT at the same time, and hold until the display goes blank and resets.
- WARNING: This product contains a chemical known to the state of California to cause cancer birth defects and other reproductive harm.
CONTACT INFORMATION
- Emerson and White-Rodgers are trademarks of Emerson Electric Co.
- ©2021 Emerson Electric Co.
- All rights reserved.
- emerson.com/white-rodgers.
- HOMEOWNER HELPLINE: 1-800-284-2925
- PART NO. 37-7840001