CTC 43157 PROGRAMMABLE THERMOSTAT

Congratulations!
Your new Climate Technology thermostat will provide years of reliable service. By saving energy, your thermostat will pay for itself during its first season of use. Thank you for buying a Hunter product! Please read this manual for complete instructions on installing and operating your thermostat. If you require further assistance, call Climate Technology Technical Support at 1-800-676-7861 from 8 am to 5-pm Central Time.

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IMPORTANT INFORMATION

This thermostat is designed to work on the following systems:

• Gas – Standing Pilot Single-Stage Heat Pumps – with no auxiliary heat
• Gas – Electronic Ignition Electric Furnace
• Gas – Fired Boilers Electric Air Conditioning
• Gas – Milivolt Systems
• Oil-Fired Boilers This thermostat will NOT control multi-stage heat pumps
• Oil – Fired Furnace or 110/220 V baseboard electric heating systems.

Temperature Range
This thermostat can be programmed between 45°F and 95°F (7°C and 35°C). However, it will display room temperatures from 30°F to 99°F (0°C and 37°C). “HI” will be displayed if the temperature is higher than 99°F (37°C), and “LO” will be displayed if the temperature is lower than 30°F (0°C). This thermostat will automatically cut off in Heat mode if the temperature rises above 95°F (35°C), and automatically cut off in Cool mode if the temperature drops below 45°F (7°C).

Compressor Protection
This thermostat provides a 3.5-minute delay after shutting off the cooling system before it can be restarted. This feature will prevent damage to your compressor caused by rapid cycling. It does not prevent a rapid compressor restart due to short power outages.

Battery Warning
Two fresh AA alkaline batteries should provide well over one year of service. However, when the batteries become drained, the Low Battery Indicator will flash on the display. When this message occurs, install new alkaline batteries. You have approximately 1 minute to change the batteries and keep the thermostat’s clock and program settings. Once the batteries have become too low to ensure proper operation, your system will be turned Off, and the display will be cleared except for flashing Low Battery Indicator on the LCD display

CAUTION: When ONLY the battery icon flashes on the display, the thermostat is shut down, and your system will no longer operate. In this condition, there is no temperature control of your dwelling.

NOTE:

• The INDIGLO® night light will not function when the thermostat is in low battery condition.
• If you plan to be away from the premises for over 30 days, we recommend that you replace the old batteries with new alkaline batteries prior to leaving.

FEATURES

INSTALLATION

What You Need
This thermostat includes two #8 slotted screws and two wall anchors for mounting. To install your thermostat, you should have the following tools and materials.

• Slotted Screwdriver(s)
• Small Philips screwdriver
• Hammer
• Electric drill and 3/16” bit
• Two 1.5 V (AA) size alkaline batteries

Remove Old Thermostat

CAUTION: Do not remove any wiring from the existing thermostat before reading the instructions carefully. Wires must be labeled prior to removal.

IMPORTANT! Turn off the power to the furnace at the main power panel or at the furnace.

• Remove the existing thermostat cover and thermostat. See Figure 1. Some thermostats will have screws or other locking devices that must first be removed.
• Once the wall mounting plate is exposed, look for wires. If wires are not visible, they may be connected to the back of the wallplate. Again, look for screws, tabs, etc. Some models have doors that open to expose wires and mounting screws.

Typical Home Thermostats

Wire Labeling

• Each wire coming from the wall to the existing thermostat is connected to a terminal point on that thermostat. Each of these terminal points is usually marked with a code letter as shown in Table A below.
• Note that this thermostat has multiple function terminals that allow Single-Stage
• Heat Pump capability. Standard systems use: Rh, Rc, G, Y, W. [Single-Stage Heat Pumps use: Rc, Y1, G, and O or B.] Table A below shows the multiple functions of the terminals. Use the terminals that match your system.
• The number of wires in your system can be as few as two (for heat-only systems), as many as eight, or any number in between. If you follow the labeling procedures correctly, you do not have to be concerned about how many wires there are.
• There is often no terminal marking on the existing thermostat of two-wire, heat-only systems. Just connect either of the wires to the RH terminal, then connect the other wire to the W terminal to complete the circuit.

IMPORTANT! BEFORE DISCONNECTING ANY WIRES, APPLY THE SELF-ADHESIVE LABELS PROVIDED TO THE WIRE AS SHOWN IN TABLE A BELOW. (For example, attach the label marked W to the wire that goes to the W or H terminal on your existing thermostat.) IGNORE THE COLOR OF THE WIRES since these do not always comply with the standard.

• After labeling the wires, disconnect them from the existing thermostat terminals.
• Remove existing wallplate. To make sure wires do not fall back into the wall opening, you may want to tape them to the wall.
• If the hole in the wall is larger than necessary for wires, seal this hole with insulating material so that no hot or cold air can enter the back of the thermostat from the wall. This air could cause a false thermostat reading.

Mount Wallplate and Thermostat

• Remove the wallplate from your thermostat by pressing the release tab on the bottom of the thermostat.
• Position the wallplate on the wall and pull existing wires through the large opening. Then level for appearance. Mark holes for plastic anchors provided, if your existing holes do not line up with those on the Hunter wallplate.
• Drill holes with 3/16” bit and gently tap anchors into the holes until flush with the wall.
• Reposition the wallplate to the wall, pulling wires through the large opening. Insert the mounting screws provided into the wall anchor and tighten.

NOTE: 5-wire Systems
If your thermostat has one wire marked R or RH (2, 3, or 4-wire system), then leave the jumper wire between the RH and RC terminals on the wallplate. Otherwise, if you have separate RH and RC wires (5-wire system), then remove the jumper wire between the RH and RC terminals

Connect Wires and Mount Thermostat to Wallplate

• Match and connect the labeled wires to the appropriate coded terminal screws on the wallplate. (See Figure 4, 5.) Ignore any wires which may be present, but which were not connected to the old thermostat.
• Refer to the Wiring Diagrams below to be sure your system is wired correctly.
• If your system is a single-stage heat pump and uses an O or B wire, you must move the System Selector switch inside the thermostat to the Heat Pump position. If you have a normal furnace or electric system, leave the switch in the Standard position.
• Refer to the System Selector section on the back for more information on this switch.
• Be sure to tighten the terminal screws securely, otherwise, a loose wire could cause operational problems with your system or thermostat.
• Push excess wire back into the hole to prevent interference when installing the thermostat to the wall plate.
• Make sure the System Switch is set to OFF, and the Fan Switch is set to AUTO.
• Insert the bottom tab on the thermostat body into the slot at the bottom of the wallplate. Press the top of the thermostat body to snap it into the wallplate. Refer to Figure 6. (NOTE: Do not force the thermostat onto the wallplate, as the terminal pins may be damaged. If it does not snap properly, the thermostat may not work.)
• Insert the two AA-size alkaline batteries, observing the polarity marked inside the battery compartment.
• Switch on the main power at the panel or furnace

Wiring Diagrams

Selector Switches
In order for this thermostat to control your system, the system type must be specified by the selector switches on the printed circuit board inside the thermostat. There is also a selector switch for your choice of Fahrenheit or Celsius temperature display.

Heating System Selector (HG – HE switch)
The factory position for this switch is in the “HG” position. Leave it in this position if you have a gas furnace or an oil burner. If you have an electric furnace, test to see whether the Heat and Fan come on as expected after installation. If the Fan operation is normal, leave it in the “HG” position. If the Fan does not come on within a minute of the thermostat calling for heat, change the switch position to “HE”. The system selector has no effect in the cooling mode.

NOTE: “HG” position is for gas and most other systems. The “HE” position is for certain electric systems having a fan relay.

System Selector (STANDARD – HEAT PUMP switch)
The factory position for this switch is in the STD position. Leave it in this position if you have ANY system that uses gas, oil, electric, or hot water heating. If you have a single-stage Heat Pump (no auxiliary or emergency heat source), then slide the switch to the HP position. Be sure the reversing valve wire is connected to the correct terminal for your heat pump (Y/O) or (W/B).

F° / C° selector (Fahrenheit / Celsius)
Your thermostat is set for F° mode from the factory. In order to change to C° mode, slide the switch to C° and press the reset button on the front of the thermostat with a paper clip.

OPERATION

Setting Day and Time

• The LCD will show this information when batteries are first installed, or after the Reset button is pressed. The temperature will update after a few seconds.
• During time and day setting mode, the temperature and program displays will go blank.

Example: Set the Thermostat to the current time of 2:16 pm on Saturday. Refer to the Steps below.

• STEP 1: Press to enter time and day setting mode. The current hour and the AM / PM indicator will be flashing. Press to change the Hour up or down to the current hour. Note the AM / PM indicator, as the display will change at 12 AM and 12 PM.
• STEP 2: Press again to change from the hour setting to the minute setting. The current minute will be flashing. Press to change the Minute up or down to the current minute.

• STEP 3: Press again to change from the minute setting to the day setting. The current day will be flashing. Press to change the Day up or down to the current day.

• STEP 4: Press again to change back to the normal display.

2 Hr. / 24 Hr. Time Format
Your thermostat is set from the factory in the normal 12 (AM / PM) time format. To change to 24-hour (military) time, press at any time while the Hour, Minute, or Day is flashing to toggle between the 12-hour and 24-hour formats. The AM / PM indicator will not be displayed in 24-hour mode. Both the current time and all programs will automatically change to the selected format.

PROGRAMMING
The following time and temperature settings are pre-programmed into the thermostat:

Personal Program Schedule
You can revise the factory programs to match your own schedule. Use this Personal Program Schedule to determine which times and temperature settings match your comfort and energy-saving requirements. Use a pencil so you can revise your records each time you change your program settings.

Heating 

Cooling

Revising Programs
Familiarize yourself with manually changing programs, so that you can easily modify the programs as your comfort needs change. Follow the steps below to change the program times and temperatures.

NOTE:

• The program time can be set in 10-minute increments.
• The program temperature can be set in increments of 1°F (1°C).
• After 15 seconds without a key press, the thermostat will return to normal display mode.
• When setting the program time, note the AM / PM indicator.

STEP 1
Slide the System Switch to the HEAT or COOL position to program the corresponding system

STEP 2
Press to enter program mode. HEAT or COOL will be displayed on the LCD.

STEP 3
The Program hour and AM or PM indicators are flashing. Press to change the hour.

STEP 4

• Press again to change to the minute position. The current minute will be flashing.
• Press to change the minute.

STEP 5

• Press again to change the program temperature. The current temperature will be flashing.
• Press to change the temperature.

STEP 6

• Press again to move to the next program number.
• Repeat Steps 3 through 5 to change the remaining Weekday and Weekend programs. (There are a total of 8 programs.)
• After cycling through all 8 programs, press again to return the display to normal.
• Press at any time to exit the Program Mode.

Reviewing Programs
To review your program settings, press repeatedly to cycle through the programs. You can also make changes at any time.

System Selector Switch
The System Selector switch on the front of the thermostat determines the operating mode of the thermostat. You may select COOL, OFF, or HEAT.

NOTE: Anytime you install or remove the thermostat from the wallplate, slide the System Selector to the OFF position to prevent the possibility of a rapid system On-Off.

Fan Switch
The Fan switch should normally be located in the AUTO position. The Fan will be turned on along with the normal operation of your system. In a normal gas or oil furnace, the Fan will be turned on by your furnace after its warm-up delay. For electric heat, air conditioning, and heat pump operation, the Fan will turn on with the system. To run the Fan on continuously, slide the Fan switch to the ON position.

Temporary Manual Override
To temporarily change the current set temperature without affecting your program:

• Press and hold for about 1 second to enter Manual Override mode. When display flashes, you can release the key.
• Press again to change to your desired Set Temperature. Hold the key for 2 seconds to fast-advance the Set Temperature.

• Press to return to normal mode, or wait 15 seconds for it to return automatically.
• The current program number will flash to signify the Temporary Override.
• At the next program change time, the Temporary Override is canceled, and the next program temperature becomes the setpoint temperature.

To end the Temporary Manual Override:

• Press, then press again. This will return the set temperature to the current program set temperature

Permanent Override
To hold your Manual Override for vacation or just an extended period of time:

• Press to make the current program temperature the HOLD temperature. HOLD will be displayed on the LCD, and the Program number will disappear.
• Follow the Temporary Manual Override instructions above to change the Permanent Manual Override temperature.
• You can confirm the held set temperature by pressing for less than 1 second.

To end the Permanent Manual Override:

• Press again. The thermostat will return to the current program, and the HOLD display will be canceled.

SPAN Setting Mode
Your thermostat is set at the factory to cycle at 1°F (0.5°C) above and below the set temperature. (Span = 2) This setting has been designed to provide a comfortable room temperature under most all conditions. However, if you find your system cycling too fast or too slow, then the Span can be adjusted to modify the cycle time.

• Press and hold BOTH for three seconds.
• The display will flash, and SPAN will be displayed on the LCD.
• Press to raise the Span to 3. This setting INCREASES the cycle time by allowing your system to run LONGER.
• Press to lower the Span to 1. This setting DECREASES the cycle time by causing your system to run SHORTER.
• The Span settings remain the same for both HEAT and COOL.
• The Span can be changed at any time and is independent of program times or temperatures.
• When batteries are installed in the thermostat, or the Reset key is pressed, the Spanis reset back to setting 2.

Backlighting (INDIGLO® Night-Light)
Your thermostat has an electroluminescent lamp that backlights the display for easy viewing in the dark. When any key is pressed or the System Switch is changed, the display is illuminated. The display will remain illuminated for 5 seconds after the last key is pressed. This allows the light to stay on if you need to operate several keys.

Note: If the thermostat is in Low Battery warning condition, the backlight will not operate. Replace with 2 new AA alkaline batteries to restore the Backlight function.

Low Battery Warning
Your thermostat has a two-stage low battery warning system. When the batteries are first detected to be weak, the first stage low battery warning is indicated by the battery symbol flashing on the LCD display. At your earliest convenience, you need to replace the batteries with 2 new

AA alkaline batteries
When the batteries become too weak for normal operation, the thermostat enters the second stage low battery warning which shuts down the thermostat. In this condition, “BATT” flashes alone on the display, and the thermostat will turn your system Off. Your system will remain shut off until the batteries are replaced.

Note: The thermostat will still keep the current time and your programs in memory until new batteries are installed. After confirming that new batteries have been inserted, the thermostat will return to normal operation.

Error Mode
If the thermostat is unable to control your system due to an unexpected battery problem, the thermostat will enter error Mode. In this condition, the thermostat flashes “Err” on the LCD display, and shuts off your system. To correct this problem, replace the batteries with 2 new AA alkaline batteries, even if you have recently replaced them. Next, use a paper clip to press the RESET button next to the keypad. You will need to reprogram your thermostat and confirm normal operation. If Error Mode returns, please call CTC Technical support at 1-800-676-7861 for further information.

Auto Cut Off
Your thermostat will automatically cut off in Heat mode if the room temperature rises above 95°F (35°C). It will cut off in Cool mode if the room temperature drops below 45°F (7°C). Note that if your system has malfunctioned and no longer responds to thermostat controls, the Auto Cut-Off will have no effect. Mechanical Heat Back-up This thermostat includes a bi-metal switch that will automatically turn on the Heat when the temperature reaches about 41° F (5° C).

TROUBLESHOOTING

REFERENCE

DOWNLOAD MANUALS:

CTC 43157 PROGRAMMABLE THERMOSTAT Owners Manual

CTC 43157 PROGRAMMABLE THERMOSTAT Owners Manual