Honeywell T8400C1099 User's Manual
Contents
1. Automation and Control Solutions Honeywell Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario MIV 4Z9 69 1484 2 GH Rev 11 02 Printed in Mexico www honeywell com yourhome2. X X MOUNTING WIRING ENTRANCE MOUNTING SCREW HOLE HOLE SCREW HOLE M16432 Fig 4 Restrict wiring to shaded area T8400C1099 shown FOR STRAIGHT INSERTION STRIP 5 16 IN 8 MM FOR WRAPAROUND STRIP 7 16 IN 11 MM TERMINAL SCREW D ES 16 Fig 5 Wiring connections T8400C1099 shown 4 M13274 COOLING CONTACTOR HEATING PRIMARY CONTROL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED ractory INSTALLED JUMPER M13275 Fig 6 Typical hookup of T8400C1099 in heat cool system with single transformer A L1 HOT L2 COOLING TRANSFORMER POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED HEATING TRANSFORMER A REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER SYSTEM CAN BE USED FOR CHANGEOVER VALVE ON SINGLE STAGE HEAT PUMP SYSTEMS A POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION M12562A Fig 7 Typical hookup of T8400C1099 in heat cool system with two transformers HEAT CHANGEOVER TRANSFORMER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED CAN BE USED FOR CHANGEOVER VALVE ON SINGLE STAGE HEAT PUMP SYSTEMS A FACTORY INSTALLED JUMPER A FIELD INSTALLED JUMPER M20880 Fig 8 Typical hookup of
3. METERS M11338 Fig 1 Typical location of thermostat WALL WALL ANCHORS 2 AO T MOUNTING SCREWS 2 UARN WHEN USING WALL ANCHORS DRILL 3 16 INCH HOLES FOR DRYWALL 7 32 INCH HOLES FOR PLASTER OR WOOD Mai Fig 2 Mounting wallplate to wall Setting Fan Operation Fuel Switch The fan operation fuel switch is preset at the factory in the F position See Fig 3 This is the correct setting for most systems If this system is an electric heat system set the switch to the E position The E setting allows the fan to turn on immediately with the heating or cooling equipment in a system where the G terminal is connected 69 1484 2 Wiring IMPORTANT Use an 18 gauge maximum wire to wire the T8400 and T8401 Thermostats All wiring must comply with local electrical codes and ordinances Disconnect the power supply to prevent electrical shock or equipment damage NOTE To ensure proper mounting of thermostat restrict all wiring to the shaded area See Fig 4 The shape of the terminals permits insertion of straight or wraparound wiring connections either method is acceptable See Fig 5 Refer to Fig 6 through 10 for typical wiring hookups FAN OPERATION FUEL SWITCH M12580 Fig 3 Fan operation fuel switch T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS KEEP WIRING IN SHADED AREA 9 ope A a
4. 1 or C3 C1 Standard heating cooling temperature control C3 Aggressive heating cooling temperature control can cause room temperature to overshoot the setpoint 9 Press the A key again Factory information varies by model is shown M18420 69 1484 2 Table 1 Heating Cycle Rates System Cycles Per Hour Steam gravity 1 Hydronic heat condensing gas 3 furnace Gas or oil forced air 6 Electric heat 9 Special applications 4 5 12 High efficiency furnace Refer to equipment manufacturer s instructions 10 Press the A key to save all changes exit installer setup mode and return to normal operation NOTE After exiting installer setup mode slide the System switch to the desired position and change the setpoint to the desired room temperature CHECKOUT Heating 1 Slide the SYSTEM switch to Heat and the FAN switch to Auto 2 Press and hold the A key to raise the temperature setting several degrees above the room tempera ture After approximately ten seconds the heating equipment should start In conventional systems the system turns on the fan through the use of a time delay relay or through a limit control When using an electric heat thermostat the fan starts immediately 3 Press the W key to lower the temperature setting below the room temperature Heating equipment should stop Cooling CAUTION Low Temperature Hazard Operating at too low of an outdoor t
5. A or W key once The tem perature setpoint is displayed for approximately five seconds as the indicator points to Set and flashes rire pa M14680 3 To increase the temperature setpoint press the A key Each press changes the setpoint one degree press and hold to change the setpoint several degrees M14681 4 To decrease the temperature setpoint press the Y key Each press changes the setpoint one degree press and hold to change the setpoint several degrees M14682 Setting F C Indication and Heat Cycle Rate NOTE To save changes to the F C indication the heat cycle rate and the C3 C1 temperature control tap the A key until exiting the installer setup To set the F C indication the heat cycle rate and the C3 C1 temperature control 1 If the temperature is displayed in F set the tem perature setpoint to 52 F If the room temperature is displayed in C set the temperature setpoint to 11 C em te JE ss M14683 OPTIONAL SYSTEM CHECKOUT When in steps 2 and 3 only the Wkey can be used to turn heat or cool outputs on and off Change the SYSTEM switch setting to test heat or cool outputs No action takes place If the system switch is in the Off position Examples System setting at HEAT If heat is on the Y key turns it off if heat is off W turns it on m el rol I I M14684 F System setting at COOL If cool is
6. Honeywell 7840001099 1840101031 Electronic Thermostats The T8400 and T8401 Thermostats provide single stage non programmable temperature control for 24V heating cooling systems with manual changeover from heat to cool Heating cycle rate is selectable at 1 3 4 5 6 9 or 12 cph Cooling cycle rate is fixed at 3 cph Temperature indication can be set for F or C The T8400 Thermostat is powered through the heating cooling system controls The T8401 requires a common wire for operation Batteries are not required because setpoints are held permanently by non volatile memory The T8400 and T8401 models include a thermostat wallplate for wiring and mounting thermostat and owner s guide MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control containing mercury in a sealed tube INSTALLATION wen 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 service technician 4 After installation is complete check out product operation as provided in th
7. T8400C1099 in single stage heat pump systems 3 69 1484 2 T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS TRANSFORMER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M20881 Fig 9 Typical hookup of T8401C1031 in heat cool system HEAT CHANGEOVER TRANSFORMER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A CAN BE USED FOR CHANGEOVER VALVE ON SINGLE STAGE HEAT PUMP SYSTEMS A FIELD INSTALLED JUMPER M20882 Fig 10 Typical hookup of T8401C1031 in single stage heat pump system mouming Thermostat to Wallplate Engage the tabs at the top of the thermostat and wallplate DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT A ENGAGE TABS AT TOP OF THERMOSTAT WITH SLOTS ON MOUNTING PLATE B PRESS LOWER EDGE OF CASE TO LATCH M14677 Fig 11 Mounting thermostat wallplate OPERATION Setting FAN and SYSTEM Switches Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case See Fig 12 FAN Switch Fan switch settings are On The fan runs continuously Use for improved air circulation and air quality Auto Normal setting for most homes In cooling the fan starts and stops with the cooling equipment In heating the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on on most systems Wh
8. emperature may cause compressor damage Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer s recommendations For compressor protection during power interruption and on initial startup the T8400 and T8401 Thermostats go into a five minute delay During this delay the cooling icon a snowflake flashes 1 Slide the SYSTEM switch to Cool and the FAN switch to Auto 2 Press the W key to lower the temperature setting several degrees below the room temperature After approximately five minutes the cooling equipment should start The fan starts and stops with the cool ing equipment T8400C 1099 T8401C1031 ELECTRONIC THERMOSTATS 3 Press the A key to raise the temperature setting Fan above tho room tormperaturo gaia ye 4 Slide the SYSTEM switch to Off and the FAN shoul revue switch to On The fan should run continuously 2 Slide the FAN switch to Auto In heating the fan is controlled directly by the heating equipment and may start a few minutes after the heating equip ment turns on on most systems When using an electric heat thermostat the fan starts and stops with the heating equipment In cooling the fan starts and stops with the cooling equipment NOTE To bypass the five minute delay see the Optional System Checkout section Be sure all equipment responds correctly to the thermostat 7 69 1484 2 T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS Honeywell
9. en using an electric heat thermostat the fan starts and stops with the heating equipment Slide the FAN switch in the bottom left corner of the thermostat to select the desired fan setting 2 Swing down the thermostat and press the lower edge of the thermostat onto the wallplate to latch See Fig 11 69 1484 2 T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS SYSTEM Switch System switch settings control thermostat operation as follows Cool The thermostat controls the cooling system Off Both heating and cooling are off Heat The thermostat controls the heating system Slide the SYSTEM switch in the bottom right corner of the thermostat to select the desired system setting TEMPERATURE DISPLAY INCREASE SETTING M14678 SYSTEM SWITCH af Fig 12 Digital display and system switches FAN and SYSTEM Set Temperature Setpoint NOTE Temperature setpoint range is 40 to 99 F 5 to 37 C The temperature setpoint and the room temperature are shown separately on the digital display The W indicator points to Set when the temperature setpoint is displayed and to Room when the room temperature is displayed INDICATOR Sa Ro ROOM TEMPERATURE SETPOINT TEMPERATURE M14679 To set temperature setpoint 1 Select Heat or Cool by sliding the SYSTEM switch in the lower right corner of the thermostat to the desired mode See Fig 12 2 To display the temperature setpoint on the digital display press either the
10. ese instructions U S Registered Trademark Copyright 2002 Honeywell All Rights Reserved INSTALLATION INSTRUCTIONS CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation Location Install the thermostat about 5 ft 1 5m above the floor in an area with good air circulation at average temperature See Fig 1 Do not install the 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 the sun or appliances 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 Wallplate to Wall IMPORTANT Level only for appearance The thermostat func tions normally even when not level Mount the T8400 and T8401 with the screws provided see Fig 2 as follows 1 Place the wallplate at the desired location on the wall 2 Pull the thermostat wire through the entrance hole on the wallplate 3 Fasten the wallplate to the wall using the anchors and screws provided 4 After wiring the wallplate plug the hole to prevent drafts from affecting the thermostat see Wiring section 69 1484 2 T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS 5 FEET 1 5
11. on W key turns it off if cool is off W turns it on moist jos ds J M14685 2 Press the AW keys simultaneously for more than one second to light all segments on display and to enter installer setup mode When the keys are released a two digit software revision code is dis played rcv mt DIS ss M14686 5 69 1484 2 T8400C1099 T8401C1031 ELECTRONIC THERMOSTATS NOTE In installer setup mode only each press of the A key momentarily displays 01 Each press of the W key momentarily displays 02 When the keys are released these two digit codes are no longer displayed 3 Press the A key Factory information is displayed A typical example is shown but information dis played varies by model This information is for fac tory use only M14687 4 Press the A key again to display C or F Z M14688 5 Pressthe key to change the C or F indication r L M14689 6 Press the A key to display the heat cycle rate of 1 3 4 5 6 9 or 12 To change the heat cycle rate press the W key to scroll between 1 3 4 5 6 9 or 12 Stop scrolling when the desired rate is dis played See Table 1 for the cycle rate options and the corresponding system equipment M14690 7 Press the A key to display heating cooling temper ature control default a M18419A 8 Press the W key again to change heating cooling temperature control to C
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