Honeywell T8090A Manual
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Heating or Cooling Thermostat and Wallplate or Heating/Cooling Thermostat and Subbase
Welcome to the world of energy savings with your new Honeywell fuel saver thermostat. The Honeywell name is your assurance of accurate control and reliable operation for years to come. Your new thermostat will automatically lower and raise the temperature in your home one or more times every 24 hours. This allows you to significantly lower your fuel costs, while awakening (or returning home) to a comfortable temperature. Read this manual to learn how to use your new thermostat.
This control contains mercury in a sealed tube. Do not place 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. Contact 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. If you have questions, call Honeywell Inc. at 1-800-468-1502.
TABLE OF CONTENTS Features Of Your Thermostat.... 4 Setting The Temperature.... 7 Inserting Clock Batteries.... 8 Setting The Clock.... 9 Programming..... 10 Troubleshooting.... 14 Servicing The Thermostat.... 23 Cycle Rate Adjustment.... 23 Thermometer Adjustment.... 24 Warranty..... 27
Features Of Your Thermostat
1 FLIP-UP COVER. Lift it up to set clock for energy savings and normal temperature periods. 2 THERMOSTAT COVER. Lift up and remove to adjust heat anticipator. 3 THERMOMETER. Provides accurate room temperature reading. 4 CLOCK. This clock provides a 24-hour slotted dial to hold the programming pins. 5 CLOCK HANDS. Turn minute hand clockto match the correct AM or PM wise time to the time indicator. 6 TIME INDICATOR. Arrow head indicates time for 24-hour dial. 7 PROGRAM INDEX WHEEL. Controls high and low temperature at specific time of day as set by program pins. 8 TEMPERATURE SETTING LEVERS. Left (blue mark) controls the low temperature, right (red mark) controls the high temperature.
9 PROGRAM PINS. Must be inserted into 24-hour clock dial slots to control program index wheel. 10 PIN SLOTS. Located on 24-hour dial at 10-minute intervals for program pin insertion. 11 MANUAL PROGRAM ADVANCE BUTTON. Allows change from comfort to energy savings setting and vice versa without changing the program. 12 HEAT ANTICIPATOR SCALEPLATE. Calibrated to match the heating system current draw in amperes. 13 ANTICIPATOR SETTING LEVER. Must be adjusted to match the heating system primary control current. 14 MERCURY BULB AND BIMETAL ELEMENT (2). Provide automatic temperature control by switching the heating or cooling system on or off.
15 191108AJ WALLPLATE. Provides mounting base and wiring connections for heating-only or cooling-only thermostat.
16 Q682B SUBBASE. Provides mounting base, wiring connections and manual switching control for heating/cooling thermostat.
FAN ON AUTO HEAT OFF COOL
Setting The Temperature
Set the left lever (blue mark) to the energy savings temperature you want when you are sleeping or your home is unoccupied. Set the right lever (red mark) to the temperature you want for normal comfort periods. NOTE: You may override the time program by setting both the red and blue levers to the same temperature set point.
LOW TEMPERATURE SETTING LEVER (BLUE MARK)
HIGH TEMPERATURE SETTING LEVER (RED MARK)
Set the left lever (blue mark) to the temperature you want for normal comfort periods. Set the right lever (red mark) to the energy savings temperature you want when you are sleeping or your home is unoccupied.
Fig. 1Setting high and low temperature levers.
Inserting Clock Batteries
Power is supplied to the clock by the 24 Vac transformer, by two AAA alkaline batteries (included), or by the heating or cooling control circuit. Backup batteries may be installed to supply power to the clock if power is interrupted when using 24 Vac powering method. Install batteries in thermostat as shown in Fig. 2. Once a year or when batteries are dead, replace with two new AAA alkaline batteries. We recommend Energizer batteries.
BATTERY LOCATION FOR (2) AAA BATTERIES; INSTALL WITH POSITIVE ENDS UP
Fig. 2Inserting clock batteries.
Setting The Clock
Lift thermostat flip-up cover and youll find the 24-hour program dial, slotted in 10-minute increments. Adjust the clock to the current time by moving the minute hand carefully in clockwise direction. DO NOT reverse the minute hand. When time is correctly set, the Time Indicator Arrow (see Fig. 3) will point to the correct time and corresponding daytime (light) or nighttime (dark) band of the program dial. EXAMPLE: For 11 PM, the time indicator arrow will point directly to dark band. For 11 AM, the arrow will point to light band on dial.
Time ends, move the minute hand carefully in a clockwise direction 23 hours. Do NOT reverse the minute hand, or damage to timer mechanism may occur.
TIME INDICATOR ARROW
Daylight Savings Time
When Daylight Savings Time starts, move the minute hand carefully in a clockwise direction one hour. When Daylight Savings
Fig. 3Setting the clock.
You can program your thermostat to automatically lower and raise the temperature one or more times every 24 hours.
up to six temperature changes with the pins supplied. We recommend at least five hours for each energy saving period.
24-HOUR PROGRAM DIAL (GRAY AREA FOR NIGHT SETTINGS)
Before setting your program:
Lift thermostat flip-up cover and you'll find the 24-hour program dial. The slots on the program dial (Fig. 4) are for the program pins that can be inserted at ten-minute intervals. Three red and three blue program pins are included with your thermostat. The red pins start the high-temperature period; the blue pins start the low-temperature period. A heating program has been preprogrammed. A red pin is inserted at 6:00 AM for high temperature (comfort period); a blue pin is inserted at 10:00 PM for low temperature (energy saving period). Two additional sets of pins are located in the program pin storage area. You can set
THERMOSTAT COVER PROGRAM PIN STORAGE TIME INDICATOR ARROW
PROGRAM PIN SLOT PROGRAM INDEX WHEEL MANUAL PROGRAM ADVANCE BUTTON
Fig. 4Program components.
To change the pins or add a new energy savings period:
To insert a pin, push it straight into the selected notch on the program dial until its completely seated. To remove a pin, press against program dial and pull the pin straight out. DO NOT attempt to change a pin if it is engaged with the program index wheel. On heating/cooling systems, you must reset the pins when the seasons change. You will also probably want to change the lever positions.
Decide when you want the energy savings period to start and insert a blue pin at the notch that corresponds to this time. After the blue pin engages, the furnace will be off until room temperature drops to the energy savings set point.
WINTER SUMMER PROGRAM PROGRAM TEMPERATURE PIN IN TEMPERATURE PIN IN CONTROL F C CONTROL F C BLUE RED RED BLUE RED BLUE RED BLUE
NIGHT ENERGY SAVING PERIOD
Setting the Heating Program:
Decide when you want the temperature to reach the comfort level. Find the notch on the dial thats one-half hour before this time and insert a red pin. The half-hour head start gives the furnace time to heat the house before you wake up or arrive home.
BEGINS 10:00 PM ENDS 6:00 AM DAY BEGINS ENERGY 7:30 AM SAVING ENDS PERIOD 4:00 PM
Fig. 5Programming examples. You can set both a day and a night program. See Fig. 5 for program examples.
Setting the Cooling Program:
Decide when you want the temperature to reach the comfort level. Find the notch on the dial thats one-half hour before this time and insert a blue pin. The half-hour head start gives the air conditioner time to cool the house before you wake up or arrive home.
Decide when you want the energy savings period to start and insert a red pin at the notch that corresponds to this time. After the red pin engages, the air conditioner will be off until room temperature rises to the energy savings set point.
Start Or End Programs With Manual Program Advance Button
IMPORTANT:To prevent damage to the program advance mechanism, DO NOT use the program advance button within a 30-minute period before or after a program change. The manual program advance button enables immediate, one-time-only program changes to accommodate temporary schedule changes. Press the button to immediately begin an energy savings period or return to the normal setting. After pressing the button, check the program indicator to ensure the system is in the desired mode. If the program indicator shows blue, the lower temperature is in effect; if it shows red, the higher temperature is in effect. Using the manual advance button will not affect the stored program.
Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following:
Problem No heat. Check system switch. May be in OFF or COOL position. 1 fuse or circuit breaker. furnace power switch. May be Off. pilot flame. May be out. R and W thermostat connections. Action Move system switch to HEAT position. If blown or tripped, replace fuse or reset breaker. Move switch to ON. Relight pilot flame per furnace manufacturers instructions. Turn Off power to furnace. Check for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws. Turn On power. Contact a qualified service technician for assistance.
Problem Check Action Turn timer ahead 12 hours. Move setting knob clockwise only. Move red pin one-half hour earlier on the program dial. Relocate pins to desired settings.
Energy savings program dial for proper day or temperature program night phase. 12 hours off. Rooms do not warm up at programmed time. 2 Temperature change occurs at the wrong time. Room temperatures are not correct. timer program for heating system. May need more time to warm up rooms. programs pins for correct time locations. positions of thermostat setpoint levers. position of subbase system switch.
Reset to desired temperatures. Move to desired operating position.
Problem Room temperatures are not correct (continued). Check thermostat circuits. Action HEATING-ONLY SYSTEMMove temperature setting levers 5F (3C) above room temperature. Heating system should start. If the system does not operate, call a qualified technician. COOLING ONLY SYSTEMMove temperature setting levers 5F (3C) below room temperature. Cooling system should start. If the system does not operate, call a qualified technician. HEATING/COOLING SYSTEMWith system switch at HEAT, move temperature setting levers 5F (3C) above room temperature. Heating system should start.
Problem Room Temperatures are not correct (continued). Check Action With system switch at COOL, move temperature setting levers 5F (3C) below room temperature. Cooling system should start. If the systems do not operate, call a qualified technician. anticipator setting. (See figure on page 23 for anticipator location.) anticipator setting. (See figure on page 23 for anticipator location.) system switch. May be in OFF or HEAT position. fuse or circuit breaker. Increase anticipator setting by 0.05. Observe burner operation. Decrease anticipator setting by 0.05. Observe burner operation. Move switch to COOL position. If fuse is blown or breaker tripped, replace or reset.
Burner-on time too short. Burner-on time too long. No cooling. 1
Problem No cooling (continued) 1 Check condenser switch position. Located outdoors and may be turned OFF. Action Move to ON position.
thermostat connections. Check Turn OFF power to cooling system. for correct terminal hookups. Repair any frayed or broken wires. Firmly tighten all terminal screws. other. Thermostat setting and thermometer reading disagree. level position of thermostat. area around thermostat for drafts or radiant heat. Contact a qualified service technician for assistance. Reinstall thermostat wallplate or subbase. Use a spirit level. Thermostat should be about 5 ft (1.5m) above floor on an inside wall. Contact qualified service technician for change of location.
Problem Thermostat setting and thermometer reading disagree (continued). Clock does not run. Check calibration of thermometer. Action See instructions on page 24.
thermostat connections at the two C terminals. If no connections, clock needs batteries in order to run. 3 Batteries may not have been installed. Batteries may need replacement if new batteries are installed and clock still does not run. voltage across the two C terminals.
Install as shown on page 8. Replace with two new AAA alkaline batteries as shown on page 8. Replace thermostat. Remove thermostat from the wallplate or subbase and measure the voltage. Refer to the table on page 22 for cause and reaction.
Problem Clock does not run (continued). Check pins in program dial. If pins are not completely seated in program dial, jamming with index wheel may occur. power. May be interrupted. Action Push down on pins to make sure they are completely seated in program dial.
Clock loses time.
Make sure power is on. Reset clock.
high limit control. If clock powered Wire separate transformer to power clock, or through system transformer, install backup batteries as shown on page 8. power to clock and equipment may be off on safety. filter. May be clogged. Safety limit on equipment may cut off power to system. Replace filter and reset clock.
Problem Clock loses time (continued). Check batteries may need replacement. Action Replace with two new AAA alkaline batteries as shown on page 8. We recommend Energizer batteries.
Not applicable on model used in heating-only system. Not applicable on model used in cooling-only system. If clock is not battery powered, clock may still use batteries for backup.
If this Troubleshooting section has not solved the problem, call your qualified heating service technician or Honeywell Customer Assistance Center, 1-800-468-1502, Monday-Friday, 7:00 AM to 5:30 PM, Central time, for additional assistance.
Voltage At Clock Terminals
AC Voltge at C-C Terminals 0 Vac. Check 1. System power off. 2. Short in clock power supply wiring. 3. Limit switch contacts stuck open. 4. Transformer supplying power is burned out. 1. System transformer used to power the clock is inadequate. 2. Additional (separate) transformer used to power the clock has inadequate voltage. 1. Spring fingers o thermostat not making proper contact with subbase terminals. 2. Clock has failed. Action Restore power. Replace wiring. Free or replace limit switch. Replace transformer.
1. 2. 3. 4.
Up to 15 Vac.
1. Use additional (separate) transformer. 2. Install transformer with proper secondary voltage.
15 to 30 Vac.
1. Rebend spring fingers to a 45 degree angle to ensure proper contact. 2. Replace thermostat.
Servicing The Thermostat
Cycle Rate Adjustment
The equipment should cycle on and off just enough to keep the room temperature close to the temperature lever settings. If the thermostat seems to cycle the heating system too fast or too slow, adjust the cycle rate by moving the anticipator setting lever one indicator mark at a time (Fig. 6). Observe the heating system operation after each adjustment. NOTE: Most hot water systems require a setting of 1.2A.
ANTICIPATOR SETTING LEVER
Fig. 6Heat anticipator setting.
The thermometer has been accurately calibrated at the factory and should only need adjustment if it has been dropped or mishandled. If the set point lever and the thermometer reading do not agree, follow the procedure below. Remove thermostat cover and open the flip-up cover. Set the thermostat cover on a table near thermometer of known accuracy. Allow at least five minutes for cover thermometer to sense area temperature, then THERMOMETER BACKSIDE OF compare the readings. Be careful not to touch SLOT FLIP-UP COVER thermometer or breathe on it. If the readings are the same, replace cover and put the system into operation. INSERT AND TURN SCREWDRIVER If the readings are different, insert a small screwdriver in the thermometer slot, shown in Fig. 7, and turn it until both thermometers read the same. Replace thermostat cover and put the system into operation.
Fig. 7Thermometer adjustment.
If you have questions regarding the installation and programming of your Honeywell thermostat, please contact the Honeywell Customer Assistance Center at 1-800-468-1502, Monday-Friday, 7:00 AM to 5:30 PM, Central time. Before you call, please have the following information available: make and model of furnace, old thermostat and air conditioner.
Limited One-Year Warranty
Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell shall repair or replace it (at Honeywells option) within a reasonable period of time. If the product is defective, (i) return it, with a bill of sale or other dated proof of purchase, to the dealer or contractor from which you purchased it, or (ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage prepaid, to the following address: Honeywell Inc. in Canada Returned Goods Department Honeywell Limited/Honeywell Limitee 1050 Berkshire Lane 740 Ellesmere Road Plymouth, MN 55441-4437 Scarborough, Ontario M1P2V9 This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer. Honeywells sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you. THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write our Customer Assistance Center, Honeywell Inc., P.O. Box 524, Minneapolis, MN 554400524 or call 1-800-468-1502, Monday-Friday, 7:00 a.m. to 5:30 p.m., Central time.
Home and Building Control Honeywell Inc. 1985 Douglas Drive No. Golden Valley, MN 55422
Home and Building Control Helping You Control Your World Honeywell LimitedHoneywell Limite 740 Ellesmere Road Scarborough, Ontario M1P 2V9
D.F. Honeywell Inc. 1995 Printed in Mexico 69-05742
Rev. 28 1-95 Form Number 69-05742
T8090A/Q682B Heating, Cooling, and Heating/Cooling Thermostat, Wallplate and Subbase Installation Instructions
Check thermostat and subbase (if used) suitability for the heating, cooling, or heating/cooling system. Refer to Table 1. Assemble tools required: flat-bladed screwdriver, hand or power drill with 3/16 in. drill bit, wire cutter/stripper or sharp knife, bubble level or plumb bob and line. Assure power is off to the heating, cooling, or heating/ cooling system at the main fuse panel. Most buildings have a separate switch box or circuit breaker for disconnecting power to the heating and cooling (if applicable) equipment. This thermostat is compatible with all heating, cooling, or heating/cooling systems when thermostat is powered by batteries. If thermostat is not powered by batteries, refer to Table 1 for thermostat and system compatibility information.
TABLE 1SYSTEM COMPATIBILITY FOR NON-BATTERY POWERED THERMOSTATS. Type of Heating System to be Controlled Electric (Line Voltage)typical baseboard and radiant GasDirect Spark Ignition (DSI), Intermittent Pilot (IP), and Standing Pilot (SP) Hot Water Zone Conditions/Compatibility The R8239D1015 Isolating Relay or R841 Silent Switching Center must be installed in the thermostat control circuit. a Compatible. If not using battery backup, assure that 24V control transformer common is accessible for connection to thermostat cable conductor and power to the transformer is not regularly interrupted by high temperature or limit operation. Honeywell 2-wire valves are compatible. Some non-Honeywell 2-wire valves require an R8239D1015 Isolating Relay in the thermostat control circuit. a Some 3-wire valves require an R8239A1052 Isolating Relay in the thermostat control circuit. a, b If not using battery backup, assure that the 24V control transformer common is accessible for connection to thermostat cable conductor and power to the transformer is not regularly interrupted by high temperature, purge cycle, or limit operation. Honeywell damper motors are compatible. Some non-Honeywell damper motors require an R8239D1015 Isolating Relay in the thermostat control circuit. a Check control amperage requirement. Most are compatible.
Warm Air Zone
If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermostat will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell R841 or R8239D1015 Isolating Relay must be added to the thermostat control circuit. b Consult manufacturer for installation requirements.
D. F. Rev. 11-Honeywell Inc. 1994
Form Number69-0627B1 69-0627B1
This control contains mercury in a sealed tube. Do not place 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. Contact 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. If you have questions, call Honeywell Inc. at 1-800468-1502.
concealed pipes and chimneys. unheated (uncooled) areas such as an outside wall behind the thermostat. The number of wires required to connect this thermostat to the heating, cooling, or heating/cooling equipment depends on how the thermostat is poweredby the 24 Vac or battery, or through the control system. Refer to the Typical Wiring Diagrams section to determine the number of wires required for your application. Unpack Thermostat Handle your new thermostat carefully; rough handling may interfere with its accuracy. Before unpacking, refer to Fig. 1. Remove and discard the shipping wrap. IMPORTANT: Save package of screws and instructions for the homeowner. Remove the thermostat cover by lifting from the bottom. Set aside cover until needed later. Carefully remove the material protecting the mercury switch bulb. Loosen two captive mounting screws and separate wallplate (if provided) from back of thermostat base.
Fig. 1Unpack thermostat.
WHEN INSTALLING THIS PRODUCT 1. Read these instructions carefully. Failure to follow them could cause a hazardous 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 these instructions.
1. 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 subbase. 3. Push excess wire back into the hole and plug hole to prevent drafts from affecting thermostat operation. 4. Do not overtighten thermostat captive mounting screws because damage to subbase threads can result. 5. Do not short across coil terminals on relay. This can burn out the thermostat heat anticipator. 6. Never install more than one wire per terminal unless factory-supplied jumper with spade terminals is used. IMPORTANT: Thermostats are claibrated at the factory mounted at true level. Inaccurate thermostat leveling will cause the actual temperature to deviate from the setpoint temperature. Locate New Thermostat Locate thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. Do not mount the thermostat where it may 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.
LIFT COVER CAPTIVE MOUNTING SCREWS THERMOSTAT BASE
Mount Wallplate or Subbase WALL MOUNTING (FIG. 2) Hold the wallplate or subbase in position on the wall (Fig. 2). Mark holes on the wall for anchors. Use spirit level to make sure the wallplate or subbase is level. Drill 3/16 in. holes, and gently tap anchors into holes until flush with the wall. Pull wires through the large wiring hole in the wallplate or subbase. Loosely fasten the wallplate or subbase to the wall with the three screws. Do not completely tighten the screws. Carefully level the wallplate or subbase (Fig. 3), and firmly tighten the screws.
Fig. 2Mounting wallplate or subbase to wall.
3 SCREW HOLES WITH PLASTIC ANCHORS
FAN ON AUTO HEAT OFF
Fig. 3Leveling methods for wallplate or subbase.
OUTLET BOX MOUNTING (FIG. 4) Use a horizontally mounted outlet box if possible. If a vertical outlet box is used, mount the wallplate or subbase on a 202689A (white) Cover Plate Assembly (ordered separately). Follow the instructions provided with the cover plate assembly. Align the wallplate or subbase mounting holes on the outlet box and loosely fasten with two screws. Carefully level the wallplate or subbase (Fig. 3), and firmly tighten the screws.
PLUMB BOB OR WEIGHT
Fig. 4Mounting wallplate or subbase on horizontal outlet box.
VERTICAL OUTLET 1 BOX 2 ADAPTER RING 2
EXISTING HORIZONTAL OUTLET BOX COVER PLATE
SUBBASE OR WALLPLATE NOT INCLUDED WITH UNIT. ACCESSORY PARTS AVAILABLE. MOUNTING SCREWS (2)
EXISTING HORIZONTAL OUTLET BOX
HEATING/ COOLING SUBBASE
Wire Wallplate or Subbase Follow the instructions provided by the heating, cooling, or heating/cooling equipment manufacturer. If not available, refer to the Typical Wiring Diagrams section at the end of this publication. Disconnect the power supply before making wiring connections to prevent electrical shock or equipment damage. NOTE: All wiring must comply with local electrical codes and ordinances. This thermostat clock can be powered by a 24 Vac transformer with battery backup, 24 Vac transformer only or battery only, or through the control system. Refer to Figs. 15 through 18 for hookup diagrams of typical powering applications. FOR WALLPLATE (Heating or Cooling Systems) Refer to Fig. 5 and strip the thermostat wire insulation as necessary. For heating-only systems, connect wires to R, W, and C (if applicable) terminals. For cooling-only systems, connect wires R, Y, and C (if applicable) terminals. Firmly tighten the screws (Fig. 19). Push excess wire back into the wall. Plug the hole in the wall with nonhardening caulk, putty, or nonflammable insulation to prevent drafts from affecting thermostat operation. SUBBASE (Heating/Cooling Systems) Refer to Fig. 5 and strip the thermostat wire insulation as necessary.
Fig 5Methods of connecting terminals.
Connect the wires to the corresponding terminals on the subbase. If labels do not agree with your new subbase, refer to Table 2 and the installation instructions furnished with the subbase. NOTE: If wiring a dual transformer system, only the O or the B terminal may be used. Push excess wire back into the wall. Plug the hole in wall with nonhardening caulk, putty, or nonflammable insulation to prevent drafts from affecting the thermostat operation. Mount the Thermostat Note the tabs on the top inside edge of the thermostat base. These tabs fit the slots molded into the top of the wallplate or subbase. Hang the thermostat base on the wallplate or subbase. Insert the two captive mounting screws located in the bottom corners of the base (Fig. 6). Firmly tighten the screws.
Fig. 6Thermostat mounting.
MOUNTING SLOT (2)
FOR WRAPAROUND CONNECTION STRIP 7/16 in. [11 mm]
TABLE 2TERMINAL DESIGNATIONS. Subbase Terminal R Rc Rh W Y G C O B P 69-0627B1 Control Function Control transformer power. Line side of 24V power supply; cooling side, 2 transformer heat/cool system. Line side of 24V power supply; heating side, 2 transformer heat/cool system. Heating control circuit. Cooling control circuit; jumper to W for heat pump compressor control if no P terminal on subbase. Fan control circuit. Clock control (transformer common). Cooling damper or changeover/reversing valve, makes continuously in cool. Heating damper or changeover/reversing valve, makes continuously in heat. Heat pump contactor; P terminal on some models only. 4
FOR STRAIGHT CONNECTION STRIP 5/16 in. [8 mm]
WALLPLATE OR SUBBASE
CAPTIVE MOUNTING SCREWS
Insert Clock Batteries Power is supplied to the clock by the 24 Vac transformer or two AAA alkaline batteries (included), or by the heating or cooling control circuit. Backup batteries may be installed to supply power to the clock if power is interrupted when using 24-Vac powering method. Install the batteries in the thermostat (Fig. 7). Once a year or when batteries are dead, replace with two new AAA alkaline batteries. We recommend Energizer batteries.
Fig. 7Insert clock batteries.
BATTERY LOCATION FOR (2) AAA BATTERIES; INSTALL WITH POSITIVE ENDS UP
If no current rating or heat anticipator setting is given, measure the current with an ammeter. Proceed with the following steps. Remove thermostat from wallplate or subbase. Connect an ac ammeter of appropriate range (about 0A to 2A) between the R and W terminals on the wallplate or subbase, except in electric heat and heat pump systems. Let the system operate for one minute. Adjust the heat anticipator lever to match the number that reads on the ammeter.
Fig. 8Set clock.
TIME INDICATOR ARROW
Set Clock Adjust the clock by moving the minute hand clockwise. Do NOT reverse the minute hand. When time is correctly set, the time indicator arrow (Fig. 8) points to the correct time and the corresponding daytime (light) or nighttime (dark) portion of the program dial. Set Heat Anticipator Adjust the heat anticipator lever to match the current rating of the primary control for the proper cycle rate (Fig. 9). Adjustable anticipation must be set for total current of heat and fan control. The current rating is usually stamped on the control or valve (Fig. 10), or a setting may be given in the device instructions.
Fig. 9Adjust heat anticipator.
ANTICIPATOR SETTING LEVER
Fig. 10Current rating of primary control.
OIL BURNER CONTROL
SHOWS VOLTAGE RATING SHOWS ANTICIPATOR SETTING SHOWS CURRENT DRAW V8043E 24V 50/60CY.32 AMP @ 60CY
0.2 A M
SHOWS LOW VOLTAGE
SHOWS VOLTAGE RATING
T T F F
24 Vac 50/60 Hz 0.4 AMP
FROM MAIN FUEL SUPPLY SHOWS ANTICIPATOR SETTING
TYPICAL GAS VALVE
Attach Thermostat Cover Make sure the packing inserts in the thermostat base are removed. Place the two tabs on the upper edge of the cover into the mounting slots in the thermostat base (Fig. 11). Swing the cover downward until it catches at the bottom of the base.
Fig. 11Attach cover.
AUTO: Fan operates with the cooling equipment as controlled by the thermostat or with the heating equipment as controlled by the plenum switch. In electric heat, heat pump and fan coil systems, the fan is controlled by the thermostat in heating and cooling. To switch positions, use thumb or index finger to slide lever to the desired position. For proper circuit operation, switch lever must stop in detent over the desired function indicator mark.
Do NOT check operation by shorting across terminals of system controls. This will damage the heat anticipator. HEATING-ONLY SYSTEM Turn on power to the furnace. Push both temperature setting levers together at least 5F (3C) above the room temperature. The main burner should come on. The fan will start when the furnace heats up. Move both levers 5F (3C) below the room temperature. The burner should shut off. Operate the entire heating system at least one complete cycle. If thermostat fails any test, refer to the Troubleshooting Guide in the Owners Manual. Reset both temperature setting levers to the desired temperatures. COOLING-ONLY SYSTEM Turn on power to the cooling equipment. Push both temperature setting levers together at least 5F (3C) below the room temperature. The cooling equipment will operate, and the fan will start. Allow for any time delay that may be built into the compressor control circuit. NOTE: To avoid compressor damage, do not operate the system when outdoor temperature is below 50F (10C). Refer to manufacturer recommendations. Move both levers 5F (3C) above room temperature. The cooling equipment and the fan should shut off. Operate the entire cooling system at least one complete cycle. If thermostat fails any test, refer to the Troubleshooting Guide in the Owners Manual. Reset both temperature setting levers to the desired temperatures. HEATING/COOLING SYSTEM Turn on power to the furnace and cooling system. Place the system switch lever to HEAT and fan switch lever to AUTO. Push both temperature setting levers together at least 5F (3C) above room temperature. The main burner should come on. The fan will start when the furnace heats up. (If central electric heat, fan coil, or heat pump system, fan starts immediately.) Move both levers 5F (3C) below room temperature. The burner should shut off. 6
Set Temperature Control Levers The two levers on top of the thermostat control the low and high temperatures for energy savings and comfort control (Fig. 12). The lever on the left (blue mark) controls the lower temperature. The lever on the right (red mark) controls the higher temperature. We recommend pushing the levers together at an appropriate temperature for either heat or cool until the occupant programs the thermostat and makes the final temperature selections.
Fig. 12Temperature control levers.
LOW TEMPERATURE (BLUE MARK) SET LEVER HIGH TEMPERATURE (RED MARK) SET LEVER
Set Subbase Switches (If Applicable) The subbase system switch controls system operation as follows: HEAT: Heating system is controlled by the thermostat. Cooling system is off. COOL: Cooling system is controlled by the thermostat. Heating system is off. OFF: Both the heating and cooling systems are off. If the fan switch is in the AUTO position, the fan is also off. The subbase fan switch controls fan operation as follows: ON: Fan operates continuously.
Place the system switch lever to COOL and the fan switch lever to AUTO. The cooling equipment will operate, and the fan will start. Allow for any time delay that may be built into the compressor control circuit. NOTE: To avoid compressor damage, do not operate the system when outdoor temperature is below 50F (10C). Refer to manufacturer recommendations. Move both temperature setting levers together at least 5F (3C) above the room temperature. The cooling equipment should shut off. Place the fan switch to ON. The fan should run continuously with the system switch in any position. Place the system switch to OFF. Move both temperature setting levers to various positions. The heating and cooling systems should not operate. Operate the entire system for at least one complete cycle with the system switch at COOL and one complete cycle with the system switch at HEAT. If thermostat fails any test, refer to the Troubleshooting Guide in the Owners Manual. Reset both temperature setting levers to the desired temperatures. Leave Owners Manual and Assistance Information in a convenient place for the building occupant or provide with other appliance manuals.
THERMOMETER READING AND THE HIGH TEMPERATURE LEVER POSITION ARE APPROXIMATELY THE SAME AT THE INSTANT THE MERCURY MOVES TO THE OTHER END, NO RECALIBRATION IS NEEDED. If calibration is necessary, proceed as follows: 1. Remove the cover. 2. Place open-end calibration wrench, part no. 104994A (ordered separately), on the hex nut under the bimetallic coil controlled by the red lever (Fig. 14). Hold lever so it does not move, and gently turn the wrench clockwise until the mercury rests securely in the right end of the tube. 3. Put the thermostat cover on and wait 10 minutes. 4. Read the thermometer. Then remove the cover. Moving both levers, place the HIGH lever at the thermometer reading. Hold lever so it does not move, and gently turn the wrench counterclockwise until the mercury just slides to the left end of the tube but no farther. Try to do this quickly so the heat from your hands does not affect the thermostat. 5. Repeat this procedure for the blue lever.
Fig. 13Thermometer calibration.
THERMOMETER The thermometer in your thermostat was accurately calibrated at the factory. The thermometer should need adjustment only if it has been dropped or shifted due to mishandling. If the setpoint lever and the thermometer reading do not agree: 1. Remove the thermostat cover by pulling up from the bottom of cover until it clears the mounting slots. 2. Set the thermostat cover on a table near an accurate thermometer. 3. Allow five minutes for cover thermometer to sense area temperature; compare the readings. Be careful not to touch thermometer or breathe on it. 4. If the readings are the same, replace cover and put the system into operation. 5. If the readings are different, insert a small screwdriver in the thermometer and turn it until the thermometers have the same reading (Fig. 13). 6. Replace thermostat cover and put the system into operation. NOTE: Radiant heat from your hands will offset the thermometer reading. After making each adjustment, wait 5 or 10 minutes for the thermometer to stabilize before comparing. THERMOSTAT This thermostat was calibrated at the factory and should not need recalibration in the field. If recalibration seems necessary, first be sure wallplate or subbase is accurately leveled. Then check thermometer calibration. To check thermostat calibration, allow several hours of operation after installation. Then read thermometer and remove cover. Push temperature levers together to a setting below room temperature. Slowly move them up the scale together until the mercury slides across the tube. IF THE 7
Fig. 14Use of 104994A calibration wrench.
Typical Wiring Diagrams
Fig. 15Typical hookup for clock powered by separate 24-Vac transformer. Fig. 17Typical hookup for clock powered by system transformer. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when heating equipment is off.
CLOCK 2 BATTERY THERMOSTAT THERMOSTAT
L1 (HOT) L2 L1 (HOT) L2 HEAT RELAY
L1 (HOT) L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. BATTERY BACKUP MAY BE USED IF POWER TO CLOCK IS INTERRUPTED.
Fig. 18Typical hookup for clock powered through control system. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when heating equipment is off.
Fig. 16Typical hookup for clock powered by two AAA alkaline batteries only.
BATTERY THERMOSTAT C SUBBASE L1 (HOT) 1 L2 L1 (HOT) L2 HEAT RELAY 3 C RH 2 RC W Y
SUBBASE C C R W HEAT RELAY
2 JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER POWERS BOTH HEATING AND COOLING. 3 FOR POWER STEALING ON HEATING, JUMPER C-RH AND C-W TERMINALS.
Fig. 19Internal schematic and typical hookup for T8090A Thermostat/191108AJ Wallplate in heatingonly system.
CLOCK H THERMOSTAT H HEAT ANTICIPATOR FALL C HEAT ANTICIPATOR C FALL
WALLPLATE C C R W
Home and Building Control Honeywell Inc. 1985 Douglas Drive North Golden Valley, MN 55422
Home and Building Control Honeywell LimitedHoneywell Limite 740 Ellesmere Road Scarborough, Ontario M1P 2V9
Helping You Control Your World
QUALITY IS KEY
69-0627B1 Printed in Mexico
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