Honeywell EASY-TO-SEE T841B User's Manual
Contents
1. AY 2 FAN SWITCH AUTO O Sas may HEAT CHANGEOVER VALVE ON F 4 H2 ANTICIPATOR H2 Lon FALL SYSTEM SWITCH HEAT OFF e 4 RIA 2 COOL A EA OEH FAN RELAY Ee COMPRESSOR CONTACTOR Y VU A ik Fig 2 Internal schematic and typical wiring diagram for T841A with AUX HT and EM HT LEDs Provides heat L1 HOT A COOL CHANGEOVER VALVE A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M6068A Fig 3 Internal schematic and typical wiring diagram for T841B 2 stage heat 1 stage cool manual changeover 3 69 1043 2 HEAT PUMP THERMOSTAT SETTINGS Temperature Setting The enlarged raised numbers on the right edge of the thermostat can be used for easy temperature setting by touch or sight while moving the temperature setpoint lever to the desired temperature setting The large 5 6 7 and 8 refer to 50 F 10 C 60 F 16 C 70 F 21 C and 80 F 27 C respectively A click is heard with indents every two degrees as the temperature setpoint lever is moved See Fig 1 System Switch Setting The enlarged raised letters on the left bottom edge of the wallplate can be used for easy recognition of System switch settings For the T841A Thermostat The large EH H O and C refer to EM HT HEAT OFF and COOL For the T841B Thermostat The large H O and C re2. Honeywell T841A B Easy To See Heat Pump Thermostat TRADELINE APPLICATION The T841A B Easy to See Heat Pump Thermostat provides 24 Vac control of 2 stage heating and 1 stage cooling in heat pump systems using manual change over The T841A Thermostat provides EM HT HEAT OFF COOL System switching and AUTO ON Fan switching The T841B Thermostat provides HEAT OFF COOL System switching and AUTO ON Fan switching The side of the thermostat features raised numbers for easy temperature setting by touch or sight An audible click is heard with indents every two degrees as the temperature setpoint lever is moved The thermostat wallplate features raised letters to aid in setting System switch and Fan switch settings See Fig 1 The T841A B includes a thermostat and wallplate Test holes are provided on the front of the thermostat to accommodate test meter probes without removing the thermostat from the wall Remove the cover of the thermostat to expose the test holes that are labeled to correspond with the terminals on the thermostat back OPERATION The stages of heat make 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 F is the interstage differential For T841A Thermostat only not for T841B Thermostat ligh
3. e system first received power Cooling N CAUTION Compressor Damage Hazard Operating cooling equipment in cold weather can damage compressor Do not operate air conditioner if outdoor temperature is below 50 F 10 C Move the System switch on the thermostat to COOL and the Fan switch to AUTO Move the temperature setpoint lever about 10 F 6 C below the room temperature Cooling and fan should start see Note in Checkout section Move the setpoint lever about 10 F 6 C above the room temperature Cooling and fan should shut off Fan Move System switch to OFF and Fan switch to ON The fan should run continuously Move 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 Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario MIV 4Z9 Printed in U S A on recycled 69 1043 2 GH Rev 3 03 G paper containing at least 1096 www honeywell com yourhome post consumer paper fibers
4. fer to EM HT HEAT OFF and COOL The System switch settings control the system operation as follows EM HT only on T841A Emergency heat relay is energized Cooling system is off Compressor is de energized Fan runs on call for heat if the Fan switch is in the AUTO position EM HT LED is on HEAT Heating system is automatically controlled by the thermostat Cooling system is off OFF Both the heating and cooling systems are off If the fan is set to the AUTO position the cooling fan is also off COOL Cooling system is automatically controlled by the thermostat Heating system is off Fan Switch Setting On theT841A B large A O raised letters on the right bottom edge of the wallplate refer to AUTO and ON fan settings The Fan switch settings control the fan as follows AUTO Fan operates in response to thermostat in both heating and cooling ON Fan operates continuously CHECKOUT Heating Move the System switch on the thermostat to HEAT and the Fan switch to AUTO Move the temperature 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 C below the room temperature Heating and fan should shut off IMPORTANT To prevent compressor short cycling a mini mum off timer can be included to prevent the compressor from starting for up to five minutes from when the thermostat last turned off the compressor or from when th
5. re designed for use in plaster walls that do not need anchors IMPORTANT An incorrectly leveled thermostat causes inac curate temperature control 7 Exactly level the thermostat using a spirit level or plumb line 8 Tighten the screws in the middle mounting holes 9 Replace the thermostat cover T841 BASE TEMPERATURE SETPOINT LEVER SETPOINT WIRING TERMINAL UP TO 12 M11427 Fig 1 Mounting thermostat to wallplate T841A model shown 69 1043 2 HEAT PUMP THERMOSTAT L1 HOT A CHANGEOVER RELAY COOL as O FAN SWITCH em HT GA A SYSTEM FAN RELAY AUTO LED RED I MONITOR o S ON oo C1 ANTICIPATOR 9 Eie A EM HT RELAY AUX nE LED GREEN 2 E SYSTEM FALL SWITCH o S H2 EM HT H4 0174 7 OF CHANGEOVER HEAT RELAY HEAT t e oL X EH A YT coo r3 r H2 ANTICIPATOR o o COMPRESSOR MA Q CONTACTOR POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED WHEN L TERMINAL IS CONNECTED TO SYSTEM MONITOR EM HEAT LED ALSO INDICATES COMPRESSOR MALFUNCTION VAN REMOVE W1 Y1 JUMPER WHEN HEAT RELAY 1 IS USED A X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION or cool changeover relay control and automatic fan in emergency heat mode O H1 C1 ANTICIPATOR EX HEAT RELAY 1 Hi C1 FALL CEH HEAT REL
6. t emitting diode LED indicators light when something specific happens within the system When AUX HT green or amber LED lights auxiliary heat second stage heat is operating because the weather is so cold the heat pump alone cannot handle the load When red EM HT LED lights emergency heat is operating electric strip heaters because home owner physically switched to EM HT position See heating cooling manufacturer instructions U S Registered Trademark Copyright 2003 Honeywell International Inc All Rights Reserved INSTALLATION INSTRUCTIONS MERCURY NOTICE This control contains mercury in a sealed tube Do not place the control in the trash at the end of its useful life If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contract your local waste management authority for instructions regarding recycling and the proper disposal of this control or of an old control containing mercury in a sealed tube INSTALLATION San Installing this Product 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 instruc
7. the existing thermostat wires for cracked or frayed insulation Replace any wires in poor condition To remove the thermostat cover 1 Grasp thermostat cover at the top and bottom with one hand 2 Pull outward on the bottom edge of the cover until it snaps free of the thermostat base 3 Carefully remove and save the packing material surrounding the mercury switches BACK OF DEVICE HOLES 4 Ls WALLPLATE FAN SWITCH SYSTEM SWITCH Wiring All wiring must comply with local codes and ordinances Follow equipment manufacturer wiring instructions when available NOTE Four screws are provided with the thermostat only two are required for mounting 1 Run wiring if necessary to the location If wiring is plastered into the wall make a hole next to the wire and loosen the wires so they can be pushed back into the wall later 2 Thread the wires through the hole 3 Pull the wires through the entrance hole on the wallplate 4 Connect the wires to the terminals on the back of the thermostat See Fig 1 3 5 Push the excess wire back through the hole and plug any openings with packing material to prevent drafts that can affect thermostat performance 6 Use two of the four screws provided to loosely secure the thermostat and the wallplate to the wall or outlet box through the two middle mounting holes See Fig 1 NOTE The sheet metal screws included with the ther mostat a
8. tions N CAUTION Electrical Hazard Can cause Disconnect electrical shock or equipment damage Disconnect power before beginning installation IMPORTANT To prevent interference with the thermostat link age keep wire length to a minimum and run wires as close as possible to the thermostat base Do not short across coil terminals on the relay This can burn out thermostat heat anticipator Never install more than one wire per terminal unless a factory supplied jumper with a spade terminal is used 69 1043 2 HEAT PUMP THERMOSTAT Location Locate the thermostat between 4 ft 1 2m and 5 ft 1 5m above the floor in an area with good air circulation at average room temperature NOTE Because of height restrictions of some disabled users it may be necessary to lower the thermo stat location to 4 ft 1 2m above the floor Do not install thermostat where it can be affected by drafts or dead spots behind doors and in corners hot or 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 The T841A B can be mounted directly on a wall or a horizontal outlet box Choose the method that best fits your installation In replacement applications check
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