White Rodgers 1C26 Thermostat User Manual
Contents
1. trademark and a service mark of Emerson Electric Co2. TERMINAL CROSS REFERENCE CHART New Thermostat Other Manufacturers Terminal Designation Terminal Designation RH RH M R R G W Y These are four wire single transformer systems Factory installed jumper wire between the RH and RC terminals must remain in place it to the A terminal This will allow the thermostat to energize the fan immediately on a call for heat If you are unsure if the heating system requires the thermostat to control the fan contact a qualified heating and air conditioning service person For single stage heat pump applications no auxillary heat install a short jumper wire not included across terminals W and Y If the system has a reversing valve connection energized in Cooling attach it to O If the system has a reversing valve connection energized in Heating attach itto B see Fig 4 This thermostat will not provide multi stage heating or cooling Mount Thermostat Base Gently push excess wire back into the wall opening and plug hole with a fire resistant material such as fiberglass insulation to prevent drafts from affecting thermostat operation Mount the thermostat base to the sub base using the three captive screws on the thermostat base See Fig 1 Tighten the screws securely Remove paper tag from plastic contact cover Proceed to Step 5 Factory Installed Jumper Heat Compressor Fan Relay Relay Relay Figure 2 Typical wiring for single transformer heating cooling sy
3. adjustment Typical Gas Valve Typical Zone Valve Typical Oil Primary NEW THERMOSTAT OPERATION E 1C20 Heat Only After power is turned on slide temperature B IBIR OPERATION lever to desired setting To turn heat off slide lever all the way to COOL OFF_HEAT the left until it clicks 1C26 This thermostat is easy to operate Fig 6 shows how the heating cooling system and fan operate when the switches are in No heating no cooling fan runs continuously 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 No heating no cooling no fan Cooling system cycles from thermostat fan runs continuously fan switch is in the AUTO position the fan will cycle with the Cooling system and fan cycle from thermostat heating or cooling system the fan will not run if the system switch faa ae aa f a ee eating system cycles from thermostat fan cycles is inthe OFF position and the fan switch is in the AUTO position from fan control on furnace When the fan switch is in the ON position the fan will run continuously regardless of system switch position even if the continuously system switch is set to OFF the fan will run if the fan switch is in the ON position Figure 6 Subbase switching and thermostat system operation 1C26
4. only SPECIFICATIONS ELECTRICAL DATA THERMAL DATA Switch Rating 24 VAC 30 VAC max Temperature Range 4 50 F to 90 F 10 C to 32 C Heath gisi eiia 0 15 to 1 2 Amps Operating Humidity Range 0 90 noncondensing GOOMNG ai ice E Gil dee 0 to 1 5 Amps Switch Action Snap Action Anticipator Rating Heatiga annsna Adjustable from 0 15 to 1 2 Amps CONG iissisiiassieeksosisi Fixed www white rodgers com O TROUBLESHOOTING Symptom Possible Cause Corrective Action No Heat No Cool No Fan common problems Blown fuse or tripped circuit breaker Furnace power switch to OFF 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 No Heat Pilot light not lit Broken or melted anticipator wire Loose connection to thermostat or system Thermostat or heating system requires replacement or service System Switch not set to Heat 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 itis operating correctly If the heating system is capable of operation a
5. G OLD THERMOSTAT CONTINUED FROM FIRST PAGE ATTENTION This product does not contain mercury How ever 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 white rodgers com for location to send the product containing mercury MOUNTING AND WIRING A 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 sys tem shall conform to Class II circuits per the NEC code 1020 Heat Only Two Wire A Mount base and adaptor plate Mount base and adaptor plate optional to wall using screws provided see Fig 1 B Attach wires Attach one wire to R and the other wire to W on base C Skip to Step 5 1C26 Heating and Cooling A Remove base from subbase Loosen the three screws on the base and remove B Mount switching subbase a
6. White y Rodgers Installation Instructions for Heating only 1020 and Heating amp Cooling 1026 YOUR THERMOSTAT REPLACES Description Standard Heating amp Cooling Systems 4 or 5 wires Standard Heat Only Systems Millivolt Heat Only Systems Floor or Wall Furnaces Standard Central Air Conditioning Gas or Oil Heat Electric Furnace Hydronic Hot Water Zone Heat 2 Wires Hydronic Hot Water Zone Heat 3 Wires Heat Pump No Aux or Emergency Heat Heat Pump with Aux or Emergency Heat Baseboard Electric Heating or Line Voltage 120 or 240 Volt 2 THERMOSTAT FEATURES MOUNTING SCREWS ANTICIPAT OR CAPTIVE SCREWS SUBBASE MODEL 1C26 ONLY BASE White Rodgers COVER Adaptor Plate Figure 1 optional EMERSON CONTENTS Preparations 000 Thermostat Features Removing Old Thermostat 06 Mounting and Wiring Set Heat Anticipator New Thermostat Operation ee QO Specifications cccceeseeeeeseeeeesteeeeeees 7 Troubleshooting c eee 8 PREPARATIONS Assemble tools required as shown below 5 SK FLAT BLADE SCREWDRIVER WIRE CUTTER STRIPPER HAND OR POWER DRILL WITH 3 16 INCH DRILL BIT IF NEEDED SPIRIT LEVEL OR PLUMB BOB AND LINE OPTIONAL THERMOSTAT MUST BE LEVEL TO WORK PROPERLY Failure to follow and read al
7. ator 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 ine Poor thermostat location for sensing room temperature Cooling system over or undersized Excessive Current draw influencing thermostat 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 Thermostat thermometer setting requires adjustment Thermostat setting lever requires calibration The thermometer can be adjusted by using a standard slotted screwdriver Turn the thermom eter 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 Thermostat thermometer disagrees with other room thermometers The thermometer on the thermostat is accurately calibrated at our factory but you can adjusted 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 division of Emerson Electric Co www white rodgers com The Emerson logo is a
8. daptor plate Use the screws provided to mount the subbase and adaptor plate optional to wall see Fig 1 C Attach wires to appropriate terminals e Fortwo wire systems Heat Only or Cool Only If you have a two wire Heat Only system attach one wire to RH and one to wire W If you have atwo wire Cool Only system attach one wire to RC and one to wire to Y Leave the factory installed jumper between RC and RH attached Tighten any unused terminals securely e If your system has more than two wires Use the cross reference chart to determine correct wire connections If you have a four wire heat cool system leave the factory installed jumper between RC and RH attached see Fig 2 If your system has five wires remove the factory installed jumper between RC and RH see Fig 3 e Electric heat or single stage heat pump systems This thermostat is configured from the factory to operate a heat cool fossil fuel gas oil etc forced air system Itis configured correctly for any system that DOES NOT require the thermo stat to energize the fan on a call for heat If your system is an electric heat or heat pump system that REQUIRES the ther mostat to turn on the fan on a call for heat remove the yellow factory installed jumper wire from the Y terminal and connect A CAUTION 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
9. l instructions carefully be fore installing or operating this control could cause personal injury and or property damage REMOVING OLD THERMOSTAT A 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 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 1 Remove Old Thermostat A standard heat cool thermostat consists of three basic parts a The cover which may be either a snap on or hinge type b The base which is removed by loosening all captive screws c The switching subbase which is removed by unscrewing the mounting screws that hold it on the wall or adaptor plate Make a note here 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 PART NO 37 6335B Replaces 37 6335A www white rodgers com 0835 REMOVIN
10. nd the no heat condition persists replace the thermostat Set System Switch to Heat and raise temp above room temp Intermittent Heat Furnace Lock Out Condition 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 Loose connection to thermostat or system Thermostat or cooling system requires replacement or service System Switch not set to Cool 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 Possible short in wiring Possible short in thermostat Possible short in heat cool fan system 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 anticip
11. stem TRANSFORMER 0 0 DE TRANSFORMER Heat Compressor Fan TRANSFORMER Hot m Relay Relay Relay i Hot ef 24 VAC pi pi desc fl evs Figure 3 Typical wiring for two transformer heating cooling system Factory Installed Jumper Field Installed Jumper Terminal energized Terminal energized in cooling in heating Figure 4 Typical wiring for single transformer single stage heat pump system www white rodgers com SET HEAT ANTICIPATOR 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 antici Rotate contact arm to adjust heat anticipator pator by rotating the contact arm see fig 5 The anticipator setting is indicated by the numbers on the base that the pointer For Milivolt Application points to If you are unsure where to set the anticipator contact the PARN Sei ah heater manufacturer for a recommended setting mes erii we Move the pointer counterclockwise to lengthen heating system cycles move clockwise to shorten heating cycles Adjustments f Arrow points to the should not be greater than 1 2 marking at a time current ratingiot Snap on Cover Carefully align the cover with the base and snap the primary coontrol the cover onto the base Figure 5 Anticipator
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