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Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL INJURY AND/OR PROPERTY DAMAGE.
YOUR THERMOSTAT REPLACES
Description | 1C20 | 1C26 |
Standard Heating & Cooling Systems - 4 or 5 wires | No | Yes |
Standard Heat Only Systems | Yes | Yes |
Millivolt Heat Only Systems - Floor or Wall Furnaces | Yes | Yes |
Standard Central Air Conditioning | No | Yes |
Gas or Oil Heat | Yes | Yes |
Electric Furnace | Yes | Yes |
Hydronic (Hot Water) Zone Heat - 2 Wires | Yes | Yes |
Hydronic (Hot Water) Zone Heat - 3 Wires | No | No |
Heat Pump (No Aux or Emergency Heat) | No | Yes |
Heat Pump (with Aux or Emergency Heat) | No | No |
Baseboard Electric Heating or Line Voltage (120 or 240 Volt) | No | No |
Assemble tools required as shown below.
HAND OR POWER DRILL WITH 3/16 INCH DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
WIRE CUTTER/STRIPPER
SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL — THERMOSTAT MUST BE LEVEL TO WORK PROPERLY
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage
Figure 1
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 old thermostat's switching subbase, label each wire with the terminal designation it was removed from.
Some models also include an adaptor plate to cover unpainted surfaces. Thermostat wires pass through the adaptor plate center opening.
Make a note of the anticipator setting on the old thermostat for future reference and use in step 5.
The heat anticipator pointer, if adjustable, will be set at one of a series of numbers representing the current rating of the primary control in your furnace. The number will be one of the following: .2, .4, .8, etc. or 0.2, 0.4, 0.8, etc.
If no heat anticipator/indication is showing, do not be concerned; move on to the next step.
ATTENTION! This product does not contain mercury. However, this product may replace a unit which 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 into a container which 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 in a suitable container. Refer to www.thermostat-recycle.org for location to send the product containing mercury.
Do not use on circuits exceeding specified voltage. Higher voltage will damage control and could cause shock or fire hazard. |
For California Residents: This product contains a chemical known to the state of California to cause cancer and birth defects and other reproductive harm. |
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Take care when securing and routing wires so they do not short to adjacent terminals or rear of thermostat. Personal injury and/or property damage may occur. |
TERMINAL CROSS REFERENCE CHART | |||||
New Thermostat Terminal Designation |
Other Manufacturers' Terminal Designation |
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RH | 4 | RH | M | R5 * | R * |
RC | R | R | V | - | - |
G | G | G | F | G | G |
W | W | W | H | 4 | W |
Y | Y | Y | C | Y6 | Y |
*These are four-wire, single-transformer systems. Factory installed jumper wire between the RH and RC terminals must remain in place. |
Set anticipator to match the setting of your old thermostat you noted in Step 3, or, the anticipator should be set to match the current rating stamped on your main heating control. The heat anticipator is adjustable from 0.15 to 1.2 amps. Adjust the anticipator by rotating the contact arm. The anticipator setting is indicated by the numbers on the base that the pointer points to. If you are unsure where to set the anticipator contact the heater manufacturer for a recommended setting.
Anticipator adjustment
Move the pointer counterclockwise to lengthen heating system cycles; move clockwise to shorten heating cycles. Adjustments should not be greater than 1/2 marking at a time.
Snap on Cover: Carefully align the cover with the base and snap the cover onto the base.
1C20 Heat Only – After power is turned on, slide temperature lever to desired setting. To turn heat off, slide lever all the way to the left until it clicks.
1C26 – This thermostat is easy to operate. The table below shows how the heating/cooling system and fan operate when the switches are in various positions. After power is turned on, use the system switch to select either heating or cooling, or to turn the heating/ cooling system off. Use the fan switch to control fan operation. When the fan switch is in the AUTO position, the fan will cycle with the heating or cooling system (the fan will not run if the system switch is in the OFF position and the fan switch is in the AUTO position). When the fan switch is in the ON position, the fan will run continuously, regardless of system switch position (even if the system switch is set to OFF, the fan will run if the fan switch is in the ON position).
Subbase switching and thermostat/system operation (1C26 only)
ELECTRICAL DATA
Switch Rating: 24 VAC (30 VAC max.)
Heating: 0.15 to 1.2 Amps
Cooling: 0 to 1.5 Amps
Switch Action: Snap Action
Anticipator Rating:
Heating: Adjustable from 0.15 to 1.2 Amps
Cooling: Fixed
THERMAL DATA
Temperature Range: 50°F to 90°F (10°C to 32°C)
Operating Humidity Range: 0 – 90% noncondensing
Symptom | Possible Cause | Corrective Action |
No Heat/No Cool/No Fan (common problems) |
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Replace fuse or reset breaker. Turn switch to ON. Replace door panel in proper position to engage safety interlock or door switch. |
No Heat |
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Re-light pilot. Excessive current or dead short in system. Have a qualified service person check the system before replacing thermostat. Verify thermostat and system wires are securely attached. Your furnace manufacturer or service person can describe how to test the heating system to verify it is operating correctly. If the heating system is capable of operation and the no heat condition persists, replace the thermostat. Set System Switch to Heat and raise temp above room temp. |
Intermittent Heat |
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Many furnaces have safety devices that shut the system down when a lock-out condition occurs. If the heat works intermittently contact the furnace manufacturer or local service person for assistance. |
No Cool |
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Verify thermostat and system wires are securely attached. Your cooling system manufacturer or service person can describe how to test the cooling system to verify it is operating correctly. If the cooling system is capable of operation and the no cooling condition persists, replace the thermostat. Set System Switch to Cool and lower temp below room temp. |
Heat, Cool or Fan Runs Constantly |
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Check each wire connection to the thermostat to verify it is neatly looped under the terminals. No extra wire should stick out from under the terminals. |
Furnace Cycles Too Fast or Too Slow Narrow or wide temperature swing | See Step 5, Adjusting the Anticipator. | The anticipation setting is the only adjustment that effects the heating cycle rate. If an acceptable cycle rate is not achieved using the anticipator contact a local service person for additional suggestions. The location of the thermostat, size of the Heat/Cool System and current draw can influence the cycle rate. |
Cooling Cycles Too Fast or Too Slow (narrow or wide temperature swing) |
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The cycle rate for cooling can not be adjusted. The location of the thermostat, size of the Cool system and current draw can influence the cycle rate. Contact a local service person for suggestions. |
Thermostat Setting and Thermostat Thermometer Disagree |
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The thermometer can be adjusted by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting. For calibrating the setting lever contact a local heating and cooling service person. |
Adjusting Thermometer |
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The thermometer on the thermostat is accurately calibrated at our factory but you can adjust it by using a standard slotted screwdriver. Turn the thermometer pointer screw located inside the front cover to change the setting. |
White-Rodgers is a business of Emerson Electric Co.
The Emerson logo is a trademark and service mark of Emerson Electric Co.
white-rodgers.com
emersonclimate.com
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download White Rodgers 1C20 Heating Only and 1C26 Heating & Cooling Manual
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