Electronic/Mechanical Thermostat installation and operation manual 1 Model 40120 44018-01 04-01-2008
For assistance with wiring or operation, our Technical Support Group is available from 8 am to 5 pm CST. they may be reached toll-free at 1-888-830-1326.
Table of Contents Important Information........................................ 5 Tools.................................................................. 6 Uninstalling the Existing Unit............................. 9 Installing the Thermostat................................. 12 Installing the wall plate.................................... 14 connecting the wires............................ 15 attaching the thermostat...................... 17 Operation........................................................
Electronic/Mechanical Thermostat Model 40120 Congratulations! Thank you for choosing a Hunter thermostat. Your new Hunter thermostat will provide years of reliable service and year-round energy savings. Please read this manual before beginning installation and save this booklet for complete operation instructions.
important information This thermostat is designed to work on the following heating and cooling systems: Gas – Standing Pilot Gas – Electronic Ignition Gas – Fired Boilers Gas – Millivolt Systems Oil – Fired Boilers Oil – Fired Furnace Electric Furnace This thermostat is not designed for heat pump systems or 110/220 V baseboard heating systems. If you are unsure what kind of heating and cooling system you have, please contact a qualified HVAC Technician for assistance.
Tools This thermostat includes two #8 slotted screws and two wall anchors for mounting. To install your new thermostat, you will need the following supplies: Flat-head screwdriver ...................................................................................... Small Phillips-head screwdriver ...................................................................................... Hammer ...................................................................................... Electric drill and 3/16” bit ...
NOTICE! Do not disconnect the wires from the existing thermostat before reading these instructions. The wires must be labeled prior to removal to ensure proper reconnection.
W RC Y G RC Y G W 8
uninstalling the existing unit 1. Turn the system power OFF from the existing thermostat. Turn the power to the HVAC system OFF at the main power panel or at the furnace. 2. Remove the existing thermostat cover to access the wires from the wall. (Some thermostats may have multiple covers, screws or other locking devices that must be removed or disengaged.) 3. Locate, but do not disconnect the wires. (If wires are not visible, they may be connected to the back of the wall plate.
label the wire with this sticker: heating g/f fan * See page 27 for complete wiring diagram. 10 RH W G w/h 24 Volt W RH / r / vr / 4 RH If your existing thermostat is marked...
uninstalling the existing unit, cont. 4. Using the provided stickers, label each wire according to the chart. (If the terminals are not labeled, contact a qualified HVAC technician.) W RH G W Note: Wire colors do not always comply with standards, so wire color should be ignored. Refer to the existing terminal designation for proper identification. *If a wire marked C is present, C may be a Common wire and should not be used. If you have a wire marked C, do not connect it to any terminal.
installing the thermostat INSTALLING THE THERMOSTAT 1. Remove the new thermostat from the back plate by pulling the two halves apart.
W RH G 13
installing the thermostat, cont. INSTALLING THE WALL PLATE 2. Position the new wall plate on the wall and pull the labeled wires through the opening. 3. If the existing holes do not match those on the Hunter wall plate, or if there are no existing holes, level the wall plate and mark the wall for two holes. 4. Remove the wall plate and drill two 3/16” holes where marked. 5. Tap the plastic anchors into the holes until they are flush with the wall. 6.
G W RH 15
installing the thermostat, cont. CONNECTING THE WIRES 1. Loosen, but do not remove, the terminal screws. 2. Match and connect the wires from the wall to the terminals as shown. Wires should be inserted behind the black terminal shields. Tighten each screw after the connection has been made. (The ends of any extra wires should be wrapped in electrical tape and carefully pushed back into the wall.) 3. Push any excess wire length back into the wall to prevent interference.
HE/HG Switch HG 17 HE
installing the thermostat, cont. ATTACHING THE THERMOSTAT 4. Locate the HE/HG switch on the back of the thermostat. Set the switch to HG for a gas furnace or oil burner. Set the switch to HE for electric furnaces. 5. Insert two fresh AA alkaline batteries. 6. Align the thermostat with the the wall plate, and snap the two halves together. 7. Restore power at the electrical panel or furnace.
Thermometer Set Temperature Slider System Switch SYSTEM OFF HEAT AUTO ON Fan Switch 90 80 70 60 50 F 30 20 10 C Battery Indicator 20 90 80 70 60 50 F
Operation 1. Set the Set Temperature slider to the desired temperature. 2. The System Switch determines the operating mode of the thermostat. Select Off or Heat. 3. The Fan Switch should normally be located in the Auto position. To run the fan continuously, slide the Fan Switch to the On position. Note: In Auto , The fan will be turned on along with 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.
indicators and adustment 1. The Thermometer indicates the room temperature. 2. The Battery Indicator displays two stages of Weak Battery Warning, indicated by the Battery Indicator flashing once approximately every second. When this warning appears, install two fresh AA alkaline batteries at your earliest convenience. 3. The second warning is the Shut-down Indicator, indicated by the Battery Indicator flashing approximately twice every second.
Span Adjust 23 SPAN
Indicators and Adjustments, cont. Your thermostat is preset to cycle your system off and on at 1oF above and below the Set Temperature. For maximum system efficiency and a sustained comfortable temperature your system should cycle 3 - 5 times per hour. If your system is cycling either too often or not often enough, then use a small Phillips-head screwdriver to turn the Span Adjust left or right to change the cycle time. 1. Remove the thermostat from the wall plate. 2.
1. My heating or cooling will not turn on or off. 1 a. Check the HE/HG switch to ensure it is set to the correct position. 1 b. Check the circuit breakers and switches to ensure there is enough power to the system. 1 c. Replace the batteries with fresh AA alkaline batteries. 1 d. If applicable, make sure the furnace blower door is closed properly. ...................................................................................... 2.
troubleshooting Is there help on the web? Yes. Visit http://www.hunterfan.com for more information. .................................................................................... ......... Can’t I just call someone? Sure. Our Technical Support Group is available from 8 am to 5 pm CST. They may be reached toll-free at1-888-8301326.
wiring diagrams 2-wire Heat Only System Rh Heat 24V or Millivolt Supply W Heat Relay or Valve 3-wire Heat Only System G Fan Relay Rh Heat 24V Supply 27 W Heat Relay or Valve
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