Honeywell T8631A User's Manual
Contents
1. A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED m3089 Fig 5 T8631R 2 stage heat 1 stage cool thermostat with EM HT HEAT OFF COOL system and ON AUTO fan switching CIRCUIT J TRANSFORMER gt POWER SUPPLY Le lt lt f 5 A 2 2 SWITCH MONITOR HIGH AUXILIARY LIMIT HEAT RELAY 1 EMERGENCY 2 STAGE 1 HEAT RELAY Exh SYSTEM FAN RELAY SWITCH E HEAT CHANGEOVER 5 RELAY COOL 4 bi OFF Q Q CHANGEOVER me fi RELAY HEAT COMPRESSOR Se HEAT CONTACTOR COOL 1 aos HIGH TRANS LIMIT ceiver 3 4 A Z POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS D BUS OUT REQUIRED POWER Z REMOVE JUMPER IF PRESENT FOR SYSTEM WITH ISOLATED STAGE 1 HEATING SUPPLY 137 v0G POWER AND COOLING CONNECTIONS 2 A lt DENOTES THERMOSTAT TO SUBBASE INTERCONNECT DO NOT CONNECT H BUS WIRES TO THERMOSTAT UNTIL OTHER TotalHome DEVICES ARE CONNECTED M3065 69 0689 2 Fig 6 wiring restricted to ribbed area surrounding terminals FOR STRAIGHT INSERTION FOR WRAPAROUND RESTRICT STRIP 7 16 in 11 mm2. WIRING THIS AREA FRONT VIEW OF TERMINAL AREA WIRING TO BE BELOW THIS SURFACE SURFACE OF SUBBASE CROSS SECTIONAL VIEW OF TERMINAL AREA M3062 Fig 7 T8631R cycle rate adjustment oT 1B 2A 2B R o H HZ NOT USED DISPLAY TEMPERATURE AUXILIARY HEAT ce 2B IN CYCLE RATE 1B F 2B OUT 1 TURN NORMAL FACTORY SETTING FASTER IN Fig 8 T8631A cycle rate adjustment 1A 1B R 2B AoE HEAT CYCLE RATE ADAPTIVE 2A IN SYSTEM 1A 1B ICONVENTIONAL 2 OUT RECOVERY OPTION GRAVITY QUT OUT AIR WATER 1 TURN 1 TURN DISPLAY TEMPERATURE OUT c 2 WATER 1 TURN GASOIL iN F 2B OUT WARM AIR FACTORY SETTING ELECTRIC WARM AIR 19URN N ASOME HIGH EFFICIENCY FURNACES OPERATE BETTER IF ADJUSTED TO HOT WATER SETTING M3064A CYCLE R
3. switching ae lt lt KB 2 HEATING TRANSFORMER Ox T 1 1 1 1 AUTO 1 SUBBASE STAT LOGIC 9 LOGIC CONTROL 1 HEAT DAMPER OR CIRCUIT CIRCUIT CHANGEOVER RELAY SYSTEM l SWITCH W t 1 ee es 1 bet 1 93 BUS IN A FAN RECAY TRANS A ia 1 Ga COOL DAMPER OR E BUS OUT A CHANGEOVER RELAY CONV BUS 137 0 POWER rte CO wt 62 SUPPLY COMPRESSOR 62 L2 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 407 JUMPER AND FOR SINGLE TRANSFORMER SYSTEM SYSTEM TRANSFORMER lt lt DENOTES THERMOSTAT TO SUBBASE INTERCONNECT A A A OPERATION DO NOT CONNECT H BUS WIRES TO THERMOSTAT UNTIL OTHER TotalHome DEVICES ARE CONNECTED FAN OPERATION SWITCH 4A IN ELEC POSITION USE ONE SYSTEM TRANSFORMER AND JUMPER R TO RC FOR SINGLE STAGE HEAT PUMP APPLICATIONS JUMPER W TO Y FOR SINGLE COMPRESSOR CONTACTOR M3066A Fig 4 T8631A 1 stage oil heat 1 stage cool Oil Primary has its own transformer u A HOT reac COOLING DAMPER COOLING CHANGE OVER OIL PRIMARY HEATING COOLING WALLPLATE CHANGE OVER
4. 8631R cycle rate is adjustable only for auxiliary heat TABLE I THERMOSTAT MODELS Stages Switching Thermostat Cool System Fan Program T8631A 1 HEAT OFF COOL ON AUTO 5 1 1 T8631R 1 EM HT HEAT OFF COOL ON AUTO 5 1 1 Installation unheated uncooled areas behind the thermostat WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Check the ratings on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service tech 4 After installation is complete check out product operation as provided in these instructions 5 Allow thermostat to warm to room temperature before operating IMPORTANT After wiring is complete push excess wire back into the hole and plug hole with nonhardening caulk putty or insulation to prevent drafts from affecting thermostat operation LOCATION Install thermostat and subbase about 5 ft 1 5 m above the floor in an area with good air circulation at room temperature Do not install the thermostat where it may be affected by drafts or dead spots behind doors in corners or under cabinets hot or cold air from ducts radiant heat from sun or appliances concealed pipes and chimneys such as an outside wall WIRING TO HEATING COOLING SYSTEM The T8631 requires connection t
5. ATE ADJUSTMENT NOTE MOST APPLICATIONS WILL NOT REQUIRE A CHANGE IN CYCLE RATE The room air temperature will normally vary slightly from the comfort temperature setting with the cycling of the heat pump auxiliary heater furnace or air conditioner The cycle rate of the T8631R Thermostat is factory set for heat pumps The heat pump compressor cycle rate can not be adjusted The auxiliary heat cycle rate can be adjusted by turning the cycle rate adjustment screw located on the back of the thermostat See Fig 7 T8631A has a factory set cycle rate of six cycles per hour in heating and three cycles per hour in cooling For high efficiency furnaces it can be necessary to change the cycle rate to the hot water setting Cooling cycle rate is not adjustable but heating can be adjusted by turning one or both 1A and 1B screws on the back of the thermostat See Fig 8 for adjustments The screw should only be backed out about one half turn or be turned in until tight ADAPTIVE INTELLIGENT RECOVERY CON VENTIONAL RECOVERY CONVERSION The T8631A and 8631 factory set for Adaptive Intelligent Recovery but the 8631 can be converted to Conventional Recovery by using the screw 2A on the back of the thermostat as indicated in Fig 8 With the Adaptive Intelligent Recovery setting the room will reach the comfort temperature at the exact time programmed into the thermostat The control temperature will increase gradually and turn t
6. CCESS AND CONTROL A triangle symbol is displayed on the lower right corner of the LCD when the T8631 setting has been adjusted through the TotalHome system See Fig 11 INSTALLER SELF TEST OPTIONAL NOTE Thermostat must have AC power to perform self test Perform the following test as a check of all thermostat functions If thermostat does not respond as indicated thermostat must be replaced 1 Press AHEAD and BACK keys at the same time While holding keys down all segments of the display should be on See Fig 11 2 Set system switch to OFF Press AHEAD and BACK and PRESENT SETTING keys at the same time to enter self test Fig 11 All segments on display Re OT ee IO 020 020 020 020 0205 SUN MON TUE WED THU FRI SAT COOL ONHEAT ON WAKE LEAVE RETURN SLEEP TEMPORARY 1 3 Press each key as listed below and look for re sponses listed as key is held down and released Look For This Response Press This Key Key Down Key Released PRESENT SETTING 15 see note following SKIP NEXT PERIOD 07 blank CHANGE TO LAST 03 blank PERIOD COOLER 02 blank WARMER 06 serial number transmitted on HBus BACK 04 blank AHEAD 05 blank RETURN 00 blank LEAVE 01 control micro processor mask number and revisionnumber SLEEP 08 blank WAKE 12 see note following SET HEAT COOL 09 blank DAY 13 interface micro processor mask numbe
7. Honeywell T8631A R Communicating Chronotherm III Thermostats Application T8631A Rcan be connected to Honeywell s TotalHome system for external access and control TotalHome system devices communicate using HBus a Honeywell communi cations protocol These thermostats powered directly from the control transformer provide energy saving control for a 24 Vac conventional heating cooling or multistage heat pump heating cooling system as indicated in Table 1 As long as AC power is continuously available to the transformer the thermostat will be compatible with most control systems The T8631A R models include a SYSTEM LED near the top of the thermostat face The SYSTEM LED lights when the thermostat is signaling for heating or cooling T8631R includes AUX HT and EM HT LEDs near the bottom center of the subbase The AUX HT LED lights whenever the thermostat is calling for operation of the backup or auxiliary heater Backup auxiliary heat is more expensive to operate than the heat pump and typically is used only when the heat pump is unable to handle the load The EM HT LED lights whenever the thermostat system switch is in the EM HT position The EM HT LED may also light on some systems if the heat pump is malfunction ing The system switch needs to be moved to EM HT on these heat pumps Heat and cool anticipation is fixed in both models no adjustment is necessary T8631A has adjustable cycle rate for heating T
8. e the subbase as a template and with a pencil mark the two mounting screw positions See Fig 2 If drywall construc tion plastic anchors must be used select 3 16 in bit to drill holes for anchors Gently tap anchors into holes until they are flush with the wall surface Thread wires through the center opening of the subbase Then mount the subbase by using two screws provided Gently tighten screws level top surface of subbase and then securely tighten screws WIRING All wiring must comply with local electrical codes and ordinances Fig 1 Removing thermostat from subbase Disconnect power before wiring to prevent electrical shock or equipment damage The shape of the terminal barrier permits insertion of straight or conventional wraparound wiring connections Either method is acceptable Refer to Figs 3 5 for typical hookups of subbase and thermostat NOTE Keep all wiring restricted to ribbed area surround ing terminals to assure thermostat subbase contact See Fig 6 Fig 2 Mounting subbase on wall WALL WIRES THROUGH WALL OPENING WALL ANCHORS ey HBUS SWITCH MOUNTING HOLES FAN OPERATIONAL We SWITCH FOR 8631 ONLY MOUNTING suBBASE SCREWS 2 A SWITCH UP DISCONNECTS THE HBUS A FAN CAN BE SET FOR ELECTRIC HEAT OR CONVENTIONAL M3061 Fig 3 T8631A 1 stage heat 1 stage cool thermostat with HEAT OFF COOL system and ON AUTO fan
9. he equipment on and off several times to reach the comfort temperature slowly and on time With Conventional Recovery the start time should be programmed to be earlier than the desired comfort time It may require some trial and error to arrive at the best starting time A C will appear on the display when using Conven tional Recovery TEMPERATURE CONVERSION The display readout can be converted between C and F using screw 2B See Figs 7 and 8 HBUS SWITCH The subbase has a switch that you can movetodisconnect the thermostat from the external control device See Fig 2 INSTALLING BATTERIES Three AAA alkaline batteries are provided as backup to prevent program loss in event of power outage Batteries are included with thermostat Install batteries in back of thermostat See Fig 9 Without battery backup the program will remain about 20 seconds in event of power loss Fig 9 Battery placement PLACEMENT NOTE CORRECT PLUS ND MINUS DIRECTION Fig 10 Mounting the thermostat on subbase When the batteries are low the display will flash REPL BAT REPL BAT indication wi
10. ll disappear when thermo stat is mounted back on the powered subbase with fresh batteries This may take up to 15 minutes to occur If batteries are completely dead the display will go blank when the thermostat is removed from subbase MOUNTING THE THERMOSTAT With system switch set to OFF hang the thermostat on the tabs at the top of the subbase See Fig 10 Swing down and press on lower edge until thermostat snaps into place See Fig 10B Open cover and tighten the captive mounting screws See Fig 10C SETTING DAY AND TIME NOTE Thermostat must be mounted on powered subbase to program Restore 24V power to the thermostat When power is applied to the thermostat the display will read 1 00 PM and 32 for a minute or less followed by 1 00 PM and room temperature It will go off for a few seconds then begin to flash on and off Set present day and time PRESENT Press oavmme_J Tess se curren ress in t t th t day Each f the DAY key advances the display one day BACK Press TIME ES or to set the current time If the display will not come on check mounting of thermostat to subbase If loose or misaligned remove thermostat and reinstall on the subbase making sure it is firmly attached check to see that system power is on check to see that voltage between R and C is 20 to 30 Vac Checkout CAUTION During cold weather some heat pumps will re quire
11. o both sides of the heating transformer secondary for power If Replacing An Existing Thermostat Turn off power to thermostat at furnace or heat pump A two transformer system may require turning off two switches or disconnects Remove any existing wallplate or subbase from wall Label each wire with or write down the letter or number on the wiring terminal as the wire is removed to avoid miswiring later If New Installation Run cable to a hole at the selected wall location and pull about 3 in 76 mm of wire through the opening Color coded 18 gauge thermostat cable with one conduc tor for each wiring terminal excluding H terminals is recommended Good service practice recommends select ing cable with one or two more conductors than the immediate application requires WIRING TO TOTALHOME SYSTEM The HBus connection requires an unshielded cable with 3 twisted pairs of 22 AWG solid wire Use Belden 8742 Alpha 1304 or equivalent wire Route this cable with the thermostat cable to the utility room Do not connect the HBus cable to the T8631 until the other TotalHome devices are connected Rev 3 93 Honeywell Inc 1993 Form Number 69 0689 2 MOUNTING SUBBASE The subbase does not require leveling for proper opera tion but only for appearance Remove thermostat from subbase See Fig 1 The subbase mounts directly onto the wall with the screws and anchors included in the package Us
12. r and revision number HOLD TEMP 10 blank SET PRESENT 14 see note DAY TIME following RUN PROGRAM 11 normal operat ing display NOTES Tf the system switch is in COOL the following se quence will occur N CAUTION Do NOT operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer s recommendations First press cooling system and SYSTEM LED on Second press cooling system and SYSTEM LED off gt A four digit code number will appear when the key is released The four digits of the code represent the following options First T8631A T8631R Digit CPH CPH 0 1 3 2 3 3 4 9 6 6 6 6 Second Recovery Digit Model Degrees Type 0 T8631R F A LR 1 T8631R C ALR 2 T8631A F Conventional 3 T8631A C Conventional 4 T8631R F 5 T8631R ALR 6 T8631A F ALR 7 T8631A ALR Adaptive Intelligent Recovery Third System Switch Digit Position 0 OFF 1 COOL 2 HEAT 4 EM HT Tf the system switch is in HEAT the following se quence will occur Fourth Digit Not used N CAUTION Do NOT operate heating until heat pump warmup procedure is followed Refer to manufacturer s recommendations T8631A First press Ist stage heating and SYSTEM LED on Second press heating and SYSTEM LED off T8631R First press Ist stage heating and SYSTEM LED on Second press 2nd stage heating also on Third pre
13. ss 2nd stage heating off Fourth press 1st stage heating and SYSTEM LED off If system switch is in EM HT operation is as above except Ist stage heating is locked out REFER TO OWNER S MANUAL FOR PROGRAM MING INSTRUCTIONS AND HOMEOWNER TROUBLESHOOTING This equipment is a Class digital apparatus which complies with Canadian Radio Interference Regulations CRC 1374 69 0689 2 Honeywell Home and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 740 Ellesmere Road Golden Valley Minnesota 55422 Scarborough Ontario MIP 2V9 Printed in Taiwan R O C
14. that crankcase heater be energized several hours before operating heat pump Refer to manufacturer s recommendations HEATING Move the system switch to HEAT and the fan switch to AUTO Press WARMER key until the setting is about 10 F 6 C above room temperature Heating should start and the fan should run there may be a delay of 5 10 minutes before heat turns on Press COOLER key until the setting is about 10 F 6 C below room temperature The heating equipment and fan should shut off The fan will run a short time after equipment shuts off with T8631A unless fan operation switch set for electric COOLING CAUTION Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer s recommendations NOTE When cooling setting is changed thermostat can wait up to five minutes before turning on the cooling equipment This delay is to protect the compressor 69 0689 2 Move the system switch to COOL and the fan switch to AUTO Press COOLER key until the setting is about 10 F 6 C below room temperature The cooling equip ment and fan should start Press WARMER key until the setting is about 10 F 6 C above room temperature The cooling equipment and fan should stop FAN Move the system switch to OFF and the fan switch to ON The fan should run continuously When the fan switch is in the AUTO position fan cycles with the heating or cooling system EXTERNAL A
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