Honeywell T841A1316 User's Manual
Contents
1. A B TERMINAL MUST BE CONNECTED FOR PROPER OPERATION se FAN IN EM HEAT Fig 4 Internal schematic and typical wiring diagram for TRADELINE T841A1498 and T841A1506 with EM HEAT LED Provides cooling changeover relay control 69 0452 8 4 7841A HEATING COOLING HEAT PUMP THERMOSTAT FAN REALY R T AUX HT Cd LED GREEN RTD 1 EM HT LED RED EM HT RELAY 11 FN s 9 FALL CHECK SYSTEM MONITOR LED RED HEAT CHANGE OVER VALVE COMPRESSOR CONTACTOR COOL CHANGE POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED OVER VALVE AUTO FAN IN EM HEAT Meosoc Fig 5 Internal schematic and typical wiring diagram for TRADELINEG T841A1423 and T841A1464 sold only in Australia with AUX HEAT EM HEAT and CHECK LEDs Provides heat or cool changeover relay control and automatic fan in EM HEAT mode MOVE INDICATOR TO MATCH CURRENT RATING OF PRIMARY CONTROL M2962B Fig 6 Second stage adjustable heat anticipator indicator 5 69 0452 8 7841A HEATING COOLING HEAT PUMP THERMOSTAT CHECKOUT Heating Move the SYSTEM switch on the thermostat to HEAT and the FAN switch to AUTO Move the setpoint lever to about 10 F 6 C above the room temperature Heating should start and the fan should run Move the setpoint lever about 10 F 6 C2. 3 CHECK LED indicates compressor malfunction FRONT OF DEVICE BACK OF DEVICE COVER THERMOMETER SET POINT SCALE O eee EM HEAT AUX HEAT ENE _ SYSTEM SWITCH SWITCH TO THREE MOUNTING UL winiNG TERMINAL W HOLES 4 UP TO 12 M2960A Fig 1 External view of T841A U S Registered Trademark Copyright 1997 TE All Rights Reserved 69 0452 8 opyrig oneywell Inc 7841A HEATING COOLING HEAT PUMP THERMOSTAT OPERATION The stages of heat snake sequentially as the temperature drops Make refers to the mercury switch initiating a call for heat or cool There is about 1 F 0 6 C between stages so the second stage auxiliary heat makes only when the first stage cannot handle the load This 1 F is the 7 2 5 20 differen tal The LED indicators on certain thermostat models light up when something specific happens within the system When the green or amber LED lights the auxiliary heat second stage heat is operating because the weather is so cold the heat pump alone cannot handle the load When the red EM HEAT LED lights the emergency heat is operating usually electric strip heaters because the homeowner has physically switched to the EM HEAT position See heating cooling manufacturer instructions for specific meaning RECYCLING NOTICE This control contains mercury in a sealed t
3. the hole in the packing material saved above Connect the wires to the terminals on the back of the thermostat See Fig 2 through 5 Set the second stage adjustable heat anticipator to match the current draw of the primary heating control see Heat Anticipator Setting section Push the excess wire back through the hole and plug any opening with packing material to prevent drafts that may affect thermostat performance Use screws to loosely secure the thermostat to the wall or outlet box through the two mounting holes in the middle of the device The sheetmetal screws included with the thermostat are designed for use in plaster walls that do not need anchors IMPORTANT An incorrectly leveled thermostat causes inaccurate temperature control SETTINGS Heat Anticipator Setting The second stage heat anticipator is adjustable Move the adjustable indicator to match the current draw of the second stage heating primary control or the anticipator setting of the old thermostat See Fig 6 Temperature Setting Move the setpoint lever to the desired control point on the temperature scale SYSTEM Switch Setting The SYSTEM switch positions control the system opera tion as follows EM HEAT Emergency heat relay is energized Cooling system is off Compressor is de energized Fan runs on call for heat if FAN switch is in the AUTO position EM HEAT LED is on HEAT Heating system is automatically controlled by the ther
4. EAT LEDs No fan control in EM HEAT Provides heat or cool changeover relay control 3 69 0452 8 7841A HEATING COOLING HEAT PUMP THERMOSTAT L1 HOT L2 CHANGEOVER RELAY COOL rej Ead FAN RELAY FALL FAN SWITCH em A SYSTEM LED RED MONITOR C1 ANTICIPATOR LED GREEN SYSTEM SWITCH on EM HT tr A S 5 trot COMPRESSOR CONTACTOR H2 ANTICIPATOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A REMOVE W1 Y1 JUMPER WHEN HEAT RELAY 1 IS USED A WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR EM HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION A X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION M1103E Fig 3 Internal schematic and typical wiring diagram for SUPER TRADELINE T841A1316 with AUX HEAT and EM HEAT LEDs Provides heat or cool changeover relay control and automatic fan in EM HEAT mode AUTO 4 OEE ON _ FA FAN RELAY ra 0 0 ques on SWITCH OPA HEAT RELAY H1 C1 ANTICIPATOR SYSTEM SWITCH H2 Q ANTICIPATOR EM HT C V CHANGEOVER RELAY COOL COOL _k d COMPRESSOR CONTACTOR POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED
5. Honeywell T841A Heating Cooling Heat Pump Thermostat TRADELINE INSTALLATION INSTRUCTIONS APPLICATION The T841A Heating Cooling TRADELINE Thermostat Test holes are provided on the front of the thermostat to provides 24 Vac control of two stage heating and one accommodate test meter probes without removing the stage cooling in heat pump systems using manual thermostat from the wall Remove the cover of the changeover This thermostat provides SYSTEM switch thermostat to expose the test holes which are labeled to selections of EM HEAT HEAT OFF COOL and FAN correspond with the terminals on the back of the Switch selections of AUTO ON See Fig 1 See Table 1 for thermostat T841A TRADELINE specifications Table 1 T841A TRADELINE Specifications Auto Fan LED Heat Terminal System in EM Indication Changeover Anticipation Designations Switch HEAT T841A1308 EM Manual Cool Stage 2 fixed G R Wo E Use when E EM HEAT AUX HEAT or Heat Oto 1 5A LBX Y O and Wo are HEAT OFF jumpered COOL T841A1316 R E L X Does not Wo B W1 replace Y1 0 T841A1068 T841A1423 EM HEAT Stage 2 W3 G Wo Not for systems AUX HEAT adjustable 0 1 with E to W2 CHECK to 1 2A jumper T841A1498 EM HEAT Stage 2 fixed Oto 1 5A replacement for York model no 2TH11703324 T841A1506 a HEAT LED also indicates compressor malfunction Premier White color Sold only Australia degrees C
6. below the room temperature Heating and fan should shut off NOTE To prevent compressor short cycling a minimum off timer may be included to prevent the com pressor from starting for up to five minutes from when the thermostat last turned the compressor off or from when the system first received power Cooling N CAUTION Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer recom mendations Move the SYSTEM switch on the thermostat to COOL and the FAN switch to AUTO Move the setpoint lever about 10 F 6 C below the room temperature Cooling and fan should start Move the setpoint lever about 10 F 6 C above the room temperature Cooling and fan should shut off Fan Move the SYSTEM switch to OFF and the FAN switch to ON The fan should run continuously Move the FAN switch to AUTO In this position the fan operates in response to the thermostat in both heating and cooling Honeywell Automation and Control Solutions Honeywell International Inc 1985 Douglas Drive North Golden Valley MN 55422 35 Dynamic Drive Honeywell Limited Honeywell Limit e Scarborough Ontario M1V 4Z9 Printed in U S A on recycled paper containing at least 10 69 0452 8 J S Rev 5 97 post consumer paper fibers www honeywell com yourhome
7. m above the floor in an area with good air circulation at average room tempera ture Do not mount the thermostat where it can be affected by drafts or dead spots behind doors and in corners hotor cold air from ducts radiant heat from sun appliances or fireplaces concealed pipes and chimneys unheated uncooled areas such as an outside wall behind the thermostat This thermostat is a precision instrument and was carefully adjusted at the factory Handle it carefully Mounting and Wiring CAUTION Disconnect power supply before beginning installation Can cause electrical shock or equipment damage The T841A can be mounted directly to a wall or horizontal outlet box Choose the method that best fits your installation In replacement applications check the existing thermostat wires for cracked or frayed insulation Replace wires in poor condition All wiring must comply with local codes and ordinances 7841A HEATING COOLING HEAT PUMP THERMOSTAT Grasp the thermostat cover at the top and bottom with one hand Pull outward on the bottom edge of the cover until it snaps free of the thermostat base Carefully remove and save the packing material surrounding the mercury switches 1 Run the wiring if necessary to the location If the wiring is plastered into the wall make a hole next to the cable and loosen the wires so that they can be pushed back into the wall later Thread the wires through
8. mostat Cooling system is off OFF Both the heating and cooling systems are off If the fan is at the AUTO position the cooling fan is also off COOL Cooling system is automatically controlled by the thermostat Heating system is off PROTECTION AS REQUIRED CHANGEOVER 5 Level the thermostat using a spirit level or plumb FAN Switch Setting line Tighten the two mounting screws at the middle AUTO Fan operates in response to thermostat in both of the device heating and cooling 6 Install the two screws in the top mounting holes and ON Fan operates continuously tighten 7 Replace the thermostat cover an i _O SWITCH AUTO G ol fore H2 ANTICIPATOR MONITOR 101 ees AL LED GREEN ssp VU SYSTEM RD EM HEAT SWITCH RELAY He a H EM HEAT 4 Ha 3t HEAT i lu u EM HT CHANGEOVER 4 r4 1 amp H RED A RELAY HEAT 5165 65 I AI COMPRESSOR if Y CONTACTOR CHP A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD i WHEN SYSTEM MONITOR IS CONNECTED TO L TERMINAL EM HT LED ALSO INDICATES COMPRESSOR MALFUNCTION A X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION RELAY COOL Exe M1099B Fig 2 Internal schematic and typical wiring diagram for TRADELINE T841A1308 with EM HEAT and AUX H
9. ube Do the control in the trash at the end of its useful life If this control is replacing a control that contains mercury a sealed tube do your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control or any control containing mercury in a sealed tube INSTALLATION When Installing this Product 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazard ous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced technician 4 After installation is complete check out product operation as provided in these instructions 69 0452 8 N CAUTION Disconnect power supply to prevent electrical shock or equipment damage 2 To prevent interference with the thermostat linkage keep wire length to a minimum and run wires as close as possible to the thermo stat base 3 Do not overtighten the thermostat captive mounting screws because damage to the threads can result 4 Do not short across coil terminals on the relay This can burn out the thermostat heat anticipator 5 Neverinstall more than one wire per terminal unless a factory supplied jumper with spade terminal is used Location Locate the thermostat about 5 ft 1 5
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