Emerson 1F79-111 Non-Programmable Heat Pump Thermostat Installation Guide

Emerson 1F79-111 Non-Programmable Heat Pump Thermostat

YOUR THERMOSTAT REPLACES

Description
Heat Pump (No Aux or Emergency Heat)	Yes
Heat Pump (with Aux or Emergency Heat)	Yes
Standard Heat & Cooling Systems	No
Standard Heat Only Systems	No
Millivolt Heat Only Systems – Floor or Wall Furnaces	No
Standard Central Air Conditioning	No
Gas or Oil Heat	No
Electric Furnace	No
Hydronic (Hot Water) Zone Heat – 2 Wires	No
Hydronic (Hot Water) Zone Heat – 3 Wires	No

PREPARATIONS

Assemble tools required as shown below.

Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage.

THERMOSTAT DETAILS

REMOVING OLD THERMOSTAT

CAUTION

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

Before removing wires from the old thermostat’s switching subbase, label each wire with the terminal designation it was removed from.

1. Remove Old Thermostat: A standard heat/cool thermostat consists of three basic parts:
   • The cover may be either a snap-on or hinge type.
   • The base is removed by loosening all captive screws.
   • The switching subbase is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate.
2. Shut off electricity at the main fuse box until installation is complete. Ensure that the electrical power is disconnected.
3. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as an assembly.
4. Identify each wire attached to the old thermostat using the labels enclosed with the new thermostat.
5. Disconnect the wires from the old thermostat one at a time.
   DO NOT LET WIRES FALL BACK INTO THE WALL.
6. Install a new thermostat using the following procedures.

ATTENTION! This product does not contain mercury. However, this product may replace a unit that contains mercury. Do not open mercury cells. If a cell becomes damaged, do not touch any spilled mercury. Wearing non-absorbent gloves, take up the spilled mercury and place it into a container that can be sealed. If a cell becomes damaged, the unit should be discarded. Mercury must not be discarded in household trash. When the unit this product is replacing is to be discarded, place it in a suitable shipping container. Refer to www.thermostat-recycle.org for a location to send the product with mercury.

MOUNTING AND WIRING

WARNING

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 damage thermostat and could cause personal injury and/or property damage. Thermostat installation and all components of the system shall conform to Class II circuits per the NEC code.

• Electric/Gas Jumper (Fan Option)
  If your emergency or auxiliary system will energize the blower, then jumper W906 on the thermostat base must be cut (see fig. 1).
  If your emergency or auxiliary heat system requires that the thermostat energize the fan circuit, do not cut jumper W906.
  If you are unsure of your application, contact a qualified service person.
• °F or °C Selection
  The factory default setting for temperature display is Fahrenheit.
  If you want the temperature in Celsius, clip jumper W904.
• Fast or Slow Cycle Selection
  The factory default setting is fast cycle, which cycles 1st stage at approximately 1.2°F and 2nd stage 0.75°F. If you prefer slow cycle, clip jump W905. The 1st stage and 2nd stage would be 1.5°F and 1.2°F respectively.
• O/B Terminal Switch Selection
  The O/B switch on this thermostat is factory set to “O” position.
  This will accommodate the majority of heat pump applications, which require the changeover relay to be energized in COOL. If the thermostat 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 switch must be moved to the “B” position.

CAUTION

Take care when securing and routing wires so they do not short to adjacent terminals or rear of the thermostat. Personal injury and/or property damage may occur.

Attach Thermostat Base to Wall

1. Remove the packing material from the thermostat. Gently pull the cover straight off the base. Forcing or prying on the thermostat will cause damage to the unit
2. Connect wires beneath terminal screws on base using appropriate wiring schematic (see figs. 2 through 4).
3. Place base over hole in wall and mark mounting hole locations on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two mounting screws. Place a level against bottom of base, adjust until level, and then tighten screws. (Leveling is for appearance only and will not affect thermostat operation.) If you are using existing mounting holes, or if holes drilled are too large and do not allow you to tighten base snugly, use plastic screw anchors to secure subbase.
6. Push excess wire into wall and plug hole with a fire-resistant material (such as fiberglass insulation) to prevent drafts from affecting thermostat operation.

Battery Location
This thermostat does not require batteries to operate. The 2 “AAA” alkaline batteries are for the thermostat to remember the configuration menu selections if AC voltage is lost. If the display shows BATT or when AC power is not present, the batteries are low and should be replaced with fresh “AAA” Energizer® alkaline batteries. For best results, replace all batteries with new premium brand alkaline batteries such as Duracell® or Energizer®. To replace the batteries, install the batteries along the top of the base (see fig. 1). The batteries must be installed with the positive (+) ends to the right.

CHECK THERMOSTAT OPERATION

NOTE
To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys. If at any time during testing your system does not operate properly, contact a qualified serviceperson.
Fan Operation
If your system does not have a G terminal connection, skip to Heating System.

1. Turn on power to the system.
2. Move fan switch to ON position. The blower should begin to operate.
3. Move fan switch to AUTO position. The blower should stop immediately.

CAUTION

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.

Heating System

1. Move the SYSTEM switch to the HEAT position. If the auxiliary heating system has a standing pilot, be sure to light it.
2. Press to adjust thermostat setting to 1° above room temperature. The heat pump system should begin to operate. However, if the Flame icon ( ) and Snowflake icon ( ) are flashing, the compressor lockout feature is operating (see Configuration menu, item 3.)
3. Adjust the temperature setting to 4° above room temperature. The auxiliary heat system should begin to operate and the Flame icon ( ) will be flashing.
4. Press to adjust the thermostat setting below room temperature. The heating system should stop operating.

Emergency System
EMER bypasses the Heat Pump to use the heat source wired to terminal E on the thermostat. EMER is typically used when compressor operation is not desired, or you prefer back-up heat only.

1. Move SYSTEM switch to the EMER position. EMER will flash on the display.
2. Press to adjust thermostat setting above room temperature.
   The Aux heating system will begin to operate. The Flame icon ( ) will display flashing to indicate that the Aux system is operating.
3. Press to adjust the thermostat below room temperature.
   The Aux heating system should stop operating.

CAUTION

To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.

Cooling System

1. Move SYSTEM switch to COOL position.
2. Press to adjust thermostat setting below room temperature.
   The blower should come on immediately on high speed, followed by cold air circulation.
3. Press to adjust the temperature setting above room temperature.
   The cooling system should stop operating.

Before you begin programming your thermostat, you should be familiar with its features and with the display, and the location and operation of the thermostat buttons. Your thermostat consists of two parts: the thermostat cover and the base. To remove the cover, gently pull it straight out from the base. To replace the cover, line up the cover with the base and press gently until the cover snaps onto the base.
The Thermostat Buttons and Switches

1. (Up arrow) Raises temperature setting.
2. (Down arrow) Lowers temperature setting.
3. FAN switch (ON, AUTO).
4. SYSTEM switch (COOL, OFF, HEAT, EMER).
   The Display
5. Indicates a malfunction with the system.
6. The flame icon ( ) is displayed when the SYSTEM switch is in the HEAT position. Flame icon ( ) is displayed flashing when 2nd-stage heat (Aux or Emergency) is energized. Snowflake icon ( ) is displayed (non-flashing) when the SYSTEM switch is in the COOL position. Snowflake and Flame icons are displayed (flashing) if the thermostat is in lockout mode to prevent the compressor from cycling too quickly.
7. MER is displayed flashing when the system switch is in the EMER position.
8. Displays current temperature.
9. Displays currently programmed set temperature (this is blank when SYSTEM switch is in the OFF position).
10. BATT” or CHANGE is displayed when 2 “AAA” batteries are low and should be replaced.

Configuration Menu
The configuration menu allows you to set certain thermostat operating characteristics to your system or personal requirements. To enter the configuration menu, with SYSTEM switch in OFF position, hold and for at least two seconds. To exit the configuration menu, move the SYSTEM switch from the OFF position.

1. In the run mode, if the setpoint temperature is manually raised by 3°F (2°C) or more above the actual temperature with the TEMPERATURE UP key, and the fast second stage feature is enabled, FA on, 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.
2. Select Compressor Lockout CL OFF or ON – Selecting CL ON will cause the thermostat to wait 5 minutes before turning on the compressor if the heating and cooling system loses power. It will also wait 5 minutes minimum between cooling and heating cycles. This is intended to help protect the compressor 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 Snowflake and Flame Icons for about five minutes.
3. Select Temperature Display Adjustment 3 LO to 3 HI – Allows you to adjust the room temperature display up to 3° higher or lower. Your thermostat was accurately calibrated at the factory but you have the option to change the display temperature to match your previous thermostat. The current or adjusted room temperature will be displayed on the left side of the display.
   

   Step	Press Button(s)	Displayed (Factory Default)	Press or to select:
   1	Set SYSTEM switch to OFF
   2	and for at least 2 seconds	FA (ON)	OFF
   3	and momentarily	CL (OFF)	ON
   4	and momentarily	0 HI (0)	3 LO TO 3 HI
   5*	and momentarily	dL (ON)	OFF
   6	Move SYSTEM switch from OFF	Return to normal operation

   Not available on earlier models

4. Select Backlit Display – (Not available on earlier models) The display backlight improves display contrast in low lighting conditions. Selecting the backlight ON will keep the light on continuously. Selecting Backlight OFF will keep the light off.

SPECIFICATIONS

ELECTRICAL DATA

• Electrical Rating:
  20 to 30 VAC 50/60 Hz.
  0.05 to 1.0 Amps (Load per terminal)
  1.5 Amps Maximum Total Load (All terminals combined)

THERMAL DATA

• Setpoint Temperature Range: 45°F to 90°F (7°C to 32°C)
• Operating Ambient Temperature Range: 32°F to 105°F
• Operating Humidity Range: 0 to 90% RH (non-condensing)
• Shipping Temperature Range: -40°F to 150°F

TROUBLESHOOTING

Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation you can reset the thermostat by pressing and at the same time when system is switched from “OFF” to “HEAT” position. This also resets the factory defaults. If the thermostat has power, has been reset and still does not function correctly contact your heating/cooling service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries once a year with fresh “AAA” alkaline batteries.

Symptom	Possible Cause	Corrective Action
No Heat/No Cool/No Fan (common problems)	1. Blown fuse or tripped circuit breaker. 2. Furnace power switch to OFF. 3. Furnace blower compartment door or panel loose or not properly installed.	Replace fuse or reset breaker. Turn switch to ON. Replace door panel in proper position to engage safety interlock or door switch.

Symptom	Possible Cause	Corrective Action
No Heat	1. Pilot light not lit. 2. System Switch not set to HEAT. 3. Loose connection to thermostat or system.4. Furnace Lock-Out Condition. Heat may also be intermittent. 5. Heating system requires service or thermostat requires replacement.	Re-light pilot. Set System Switch to HEAT and raise setpoint above room temperature. Verify thermostat and system wires are securely attached. Many furnaces have safety devices that shut down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance. Diagnostic: Set System Switch to HEAT and raise the setpoint above room temperature. Within a few seconds the thermostat should make a soft click sound. This sound usually indicates the thermostat is operating properly. If the thermostat does not click, try the reset operation listed above. 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 is operating correctly.
No Cool	1. System Switch not set to COOL. 2. Loose connection to thermostat or system.3. Cooling system requires service or thermostat requires replacement.	Set System Switch to COOL and lower the setpoint below room temperature. Verify thermostat and system wires are securely attached. Same procedure 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.
Heat, Cool or Fan Runs Constantly.	1. Possible short in wiring. 2. Possible short in thermostat. 3. Possible short in heat/cool/fan system. 4. Fan Switch set to Fan On.	Check each wire connection to verify they are not short- ed or touching together. No bare wire should stick out from under terminal screws. Try resetting the thermostat as described above. If the condition persists the manufac- turer of your system or service person can instruct you on how to test the Heat/Cool system for correct operation. If the system operates correctly, replace the thermostat.
Furnace (Air Conditioning) Cycles Too Fast or Too Slow (narrow or wide temperature swing)	1. The location of the thermostat and/or the size of the Heating (Cooling) System may be influencing the cycle rate.	Digital thermostats normally provide precise temperature control and may cycle faster than some older mechanical models. A faster cycle rate means the unit turns on and off more frequently but runs for a shorter time so there is no increase in energy use. If you would like to increase the cycle time, clip Jumper W-905 as mentioned in the instructions for Hydronic Heating Systems. It is not possible to shorten the cycle time. If an acceptable cycle rate is not achieved as received or by clipping W-905 contact a local service person for additional suggestions.
Thermostat Setting and Thermostat Thermometer Disagree	1. Thermostat thermometer setting requires adjustment.	The thermostat thermometer can be adjusted +/-3 degrees. See Temperature Display Adjustment in the Operation section
Blank Display and/or Keypad Not Responding	1. Voltage spike or static discharge,	Use the Reset Operation listed above.

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www.emersonclimate.com

REFERENCE

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Emerson 1F79-111 Non-Programmable Heat Pump Thermostat Installation Guide

Emerson 1F79-111 Non-Programmable Heat Pump Thermostat Installation Guide