Download Honeywell T8621D User's Manual
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T8621A,C,D, CHRONOTHERM III FUEL SAVER THERMOSTATS APPLICATION These thermostats provide energy saving control for a 24 Vac heating/cooling system as indicated in Table 1, and are powered direct from the control transformer. As long as thermostat is continuously powered, the thermostat will be compatible with any control system. These models include a SYSTEM LED, which is on when the thermostat is signaling for heating or cooling. Heat and cool anticipation is fixed in all models; no adjustment is necessary. Cycle rates are adjustable for highest stage of heating. Fan operation option switch is included on SUPER TRADELINE model to select fan operation for electric heat application. 12/24 hour clock conversion and °C/°F conversion is available on some models only. TABLE 1—THERMOSTAT MODELS. STAGES THERMOSTAT HEAT COOL T8621A 1 1 T8621C 2 1 T8621D 2 2 T8621Da 2 2 aSUPER TRADELINE model. SWITCHING SYSTEM FAN HEAT-AUTO-COOL-OFF ON-AUTO HEAT-AUTO-COOL-OFF ON-AUTO HEAT-AUTO-COOL-OFF ON-AUTO HEAT-OFF-COOL ON-AUTO APPLICATION Single Stage Multistage Multistage Multistage INSTALLATION 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 technician. 4. Allow thermostat to warm to room temperature before operating. 5. After installation is complete, check out product operation as provided in these instructions. CAUTION Disconnect power supply to prevent electrical shock or equipment damage. 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. — unheated (uncooled) areas behind the thermostat, such as an outside wall. IF REPLACING AN EXISTING THERMOSTAT Turn power to thermostat off at furnace or boiler. A two transformer system may require turning off two switches or disconnects. Remove any existing wallplate or subbase from wall. Label or write down each wire color with the letter or number on the wiring terminal as the wire is removed, to avoid miswiring later. C. H. Rev. 12-90 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. Colorcoded, 18 gauge thermostat cable with one conductor for each wiring terminal is recommended. Good service practice recommends selecting cable with one or two more conductors than the immediate application requires. MOUNTING SUBBASE IMPORTANT • The T8621 requires an additional conductor to transformer common to provide continuous 24 V power for thermostat operation. • Set the system switch in the OFF position before mounting the subbase. The subbase does not require leveling for proper operation, but for appearance only. Remove thermostat from subbase (Fig. 1). The subbase mounts directly onto the wall with the screws and anchors included in the package. If drywall construction, plastic anchors must be used; use the subbase as a template, and with a pencil, mark the two mounting screw positions (Fig. 2). Use 3/16 in. bit to drill holes for anchors. Gently tap anchors into holes until they are flush to the wall surface. Thread wires through the center opening of the subbase. Then, mount the subbase using two screws provided. Gently tighten screws, level top surface of subbase, then securely tighten screws. HEAT AUTO COOL OFF FAN ON AUTO M844 Fig. 1—Removing thermostat from subbase. Form Number 69-0330—3 ©Honeywell Inc. 1990 Refer to Figs. 4-9 for typical hookups of subbase thermostat. NOTE: Restrict all wiring to recessed area surrounding terminals (Fig.3) to assure thermostat/subbase contact. WALL WIRES THROUGH WALL OPENING ADJUSTING CYCLE RATE To custom-tailor the thermostat’s cycling performance to different types of heating equipment, cycle rate adjustment screws are provided on the back of the thermostat. Correct setting of these screws will provide optimum room temperature control. NOTE: MOST APPLICATIONS WILL NOT REQUIRE A CHANGE IN CYCLE RATE. WALL ANCHORS (2) MOUNTING HOLES HEATING TRANSFORMER MOUNTING SCREWS (2) SUBBASE R M846 2 L2 3 HIGH LIMIT POWER SUPPLY Fig. 2—Mounting subbase on wall. 1 L1 (HOT) C H HEAT RELAY W1 SYSTEM SWITCH FOR STRAIGHT INSERTION – STRIP 5/16 in. (8 mm) HEAT AUTO FOR WRAPAROUND – STRIP 7/16 in. (11 mm) RESTRICT WIRING TO THIS AREA COOL OFF C Y1 FRONT VIEW OF TERMINAL AREA FAN SWITCH COOLING CONTACTOR AUTO KEEP WIRING BELOW THIS SURFACE G TOP SURFACE OF SUBBASE ON FAN RELAY 2 L1 (HOT) RC CROSS-SECTIONAL VIEW OF TERMINAL AREA COOLING TRANSFORMER M847 L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 3—Restrict wiring to recessed area surrounding terminals. 2 FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC. WIRING All wiring must comply with local electrical codes and ordinances. 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. Push excess wire back into the hole, and plug hole with nonhardening caulk, putty or insulation to prevent drafts from affecting thermostat operation. 3 NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. M1574 Fig. 4—T8621A 1-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. 2 HEATING TRANSFORMER R 2 POWER SUPPLY HIGH LIMIT SYSTEM TRANSFORMER C H1 R POWER SUPPLY HIGH LIMIT HEAT RELAY 1 W1 H2 L2 1 L2 3 HIGH LIMIT L1 (HOT) 1 L1 (HOT) C HIGH LIMIT HEAT RELAY 2 H1 W2 K W1 SYSTEM SWITCH SYSTEM SWITCH HEAT 2 COOLING CHANGEOVER RELAY K H2 HEAT W2 AUTO AUTO COOL COMPRESSOR CONTACTOR COOL OFF OFF C2 3 C2 Y2 Y2 COOLING CONTACTOR 2 C1 C1 Y1 Y1 FAN SWITCH FAN SWITCH AUTO COOLING CONTACTOR 1 AUTO FAN RELAY G G ON ON FAN RELAY 2 L1 (HOT) RC COOLING TRANSFORMER RC L2 1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC. 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ADD RELAY (SPDT) TO ACCOMMODATE COOLING CHANGEOVER. 3 T8621D ONLY. NOTE: SET CYCLE RATE TO HOT WATER SETTING (3 cph). THERMOSTAT DOES NOT PROVIDE MINIMUM OFF TIME IN HEATING. M1575 3 NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. M1573 Fig. 5—T8621C,D 2-stage heat/2-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. For T8621C, delete second cooling stage. Fig. 6—T8621C,D single-stage heat pump thermostats with cooling changeover. HEAT-AUTO-COOLOFF system and AUTO-ON fan switching. 3 69-0330—3 L1 (HOT) L2 1 HEATING TRANSFORMER R L1 (HOT) 4 L2 1 FAN OPERATION SWITCH R POWER SUPPLY HIGH LIMIT POWER SUPPLY HIGH LIMIT SYSTEM TRANSFORMER C HIGH LIMIT W1 3 ELECTRIC C HIGH LIMIT HEATING CHANGEOVER H1 W2 HEAT 2 SYSTEM SWITCH W1 STAGE 1 HEAT RELAY HEAT 1 NON- 2 ELECTRIC STAGE 2 HEAT RELAY HEAT B SYSTEM SWITCH COMPRESSOR CONTACTOR H2 HEAT OFF HEATING DAMPER OR CHANGEOVER RELAY COOL W2 COOLING DAMPER OR CHANGEOVER RELAY AUTO COOL O OFF C2 2 STAGE 2 COOLING RELAY Y2 Y2 COOL 1 COOL 2 C1 STAGE 1 COOLING RELAY Y1 Y1 FAN SWITCH AUTO FAN SWITCH FAN RELAY FAN RELAY G AUTO ON G ON 3 RC RC 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. COOLING TRANSFORMER T8621D ONLY. 1 NOTE: SET CYCLE RATE TO HOT WATER SETTING (3 cph). THERMOSTAT DOES NOT PROVIDE MINIMUM OFF TIME IN HEATING. M1576 Fig. 7—T8621C,D single-stage heat pump thermostats with heating changeover. HEAT-AUTO-COOLOFF system and AUTO-ON fan switching. L1 L2 (HOT) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FOR GAS OR OIL APPLICATIONS OR ELECTRIC HEAT APPLICATIONS WHERE THE FAN OPERATION IS CONTROLLED INDEPENDENTLY OF THE THERMOSTAT (AUTO FAN OPERATES WITH Y1 ONLY). TWO TRANSFORMERS MAY BE USED. SET SWITCH TO NONELECTRIC POSITION. 3 FOR ELECTRIC HEAT APPLICATIONS (AUTO FAN OPERATES WITH W1 AND Y1), USE ONLY ONE TRANSFORMER; JUMPER R AND RC. SET SWITCH TO ELECTRIC POSITION. 4 NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. M13444 Fig. 8—T8621D 2-stage heat/2-stage cool manual changeover thermostat with auto fan on heat and cool; convertible to auto fan on cool only. HEAT-OFF-COOL system and AUTO-ON fan switching. 4 L1 (HOT) FAN OPERATION OPTION SWITCH The SUPER TRADELINE model includes a fan operation option switch on the subbase, visible before the thermostat is mounted on the subbase. The switch should be in electric heat position for electric heating systems that do not have independent fan control. L2 1 SYSTEM TRANSFORMER INSTALLING BATTERIES Three AAA alkaline batteries are provided as backup to prevent program loss in case of power outage. Batteries are included with thermostat. Install batteries in back of thermostat as shown in Fig. 11. Without battery backup, the program will remain about 30 seconds in event of power loss. R 3 HIGH LIMIT FAN OPERATION SWITCH 2 POWER SUPPLY C HIGH LIMIT IMPORTANT When batteries are first installed, the display will flash 1:00 PM and 32° or 0°. The temperature display will stay at 32° or 0° until the thermostat is powered from the system wiring. W1 ELECTRIC HEAT 1 NON-ELECTRIC W2 HEAT 2 SYSTEM SWITCH HEATING CHANGEOVER RELAY HEAT B OFF COOL COOLING CHANGEOVER RELAY O 1A 1B COOL 1 1 2A 2B Y2 COOL 2 COMPRESSOR CONTACTOR Y1 FAN SWITCH FAN RELAY AUTO SYSTEM G ON HOT WATER GAS/OIL WARM AIR RC 1 1A ELECTRIC WARM AIR POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FAN OPERATION SWITCH MAY BE IN EITHER POSITION. 1 3 NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. M1546A CYCLES PER HOUR TIME/TEMP DISPLAY OUT 1/2 TO 1 TURN 1 24 HR IN 3 12 HR 6 oC 9 o 1B OUT 1/2 GRAVITY AIR/WATER TO 1 TURN OUT 1/2 TO 1 TURN IN IN (FACTORY SETTING) IN OUT 1/2 TO 1 TURN 2B 2A IN OUT 1/2 TO 1 TURN IN OUT 1/2 TO 1 TURN F SCREWS 2A, 2B ONLY AVAILABLE ON SOME MODELS. M311A Fig. 10—Cycle rate adjustment. Fig. 9—T8621D single-stage manual changeover heat pump thermostat. HEAT-OFF-COOL system and AUTO-ON fan switching. The room air temperature will normally vary slightly from the comfort temperature setting with the cycling of the furnace or air conditioner. The heating cycle rate of this thermostat is factory-set for gas/oil warm air heating. The cooling cycle rate cannot be adjusted. The heating cycle rate can be adjusted by turning one or both cycle rate adjustment screws located on the back of the thermostat. In multistage heat systems, the cycle rate adjustment applies to stage 2 only; stage 1 is fixed. See Fig. 10. BATTERY PLACEMENT (NOTE CORRECT PLUS AND MINUS DIRECTION) M372A TIME/TEMPERATURE CONVERSION (SOME MODELS) The display readout may be converted between 12 and 24 hour clock or °C and °F using screws 2A and 2B as indicated in Fig. 10. Fig. 11—Battery placement. 5 69-0330—3 When the batteries are low, the display will flash REPL BAT. The building owner will have 20-30 seconds to install new batteries after removing old batteries from thermostat. After 20-30 seconds, it will be necessary to reprogram. REPL BAT indication will disappear when thermostat is mounted back on the subbase. If batteries are completely dead, the display will go blank. After replacing the battery in this case, reprogramming will be necessary. the display on during most power outages. Once the power is restored, the system will resume normal operation. If the display goes off when power is lost, either the backup batteries need to be replaced or are not installed. When power is restored, the display will flash 1:00 PM to remind you to reprogram. MOUNTING THE THERMOSTAT Hang the thermostat on the tabs at the top of the base (Fig. 12a). Swing down and press on lower edge until thermostat snaps in place (Fig. 12b). Open cover, and tighten the captive mounting screws (Fig. 12c). POWER OUTAGES Backup batteries will hold the programming and keep A. B. SYSTEM AM MON MORNIMG ROOM HEAT ON FAN AUTO ON AUTO COOL OFF HEAT AUTO C. SYSTEM AM ROOM HEAT ON MON MORNIMG TEMPERATURE PRESENT SETTING RUN PROGRAM TIME SET PRESENT DAY/TIME DAY PERIOD COPY FROM HOLD TEMP SET HEAT/COOL CANCEL PERIOD COPY TO AHEAD WARMER BACK COOLER SKIP NEXT PERIOD CHANGE TO LAST PERIOD M843 Fig. 12—Mounting thermostat on subbase. SETTING DAY AND TIME Restore 24 V power to the thermostat. When power is applied to the thermostat, the display will read 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. 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 heat or cool system power is on. — check voltage between R and C; should be 24 to 30 Vac. SET Press PRESENT DAY/TIME . Press DAY to set the current day. Each press of the DAY key advances the display one day. Press TIME AHEAD or BACK to set the current time. CHECKOUT HEATING NOTE: When heating setting is changed, thermostat will wait up to 5 minutes before turning on the heating equipment. This delay protects the compressor. delay on gas or oil forced air systems). Press COOLER key until the setting is about 10° F [6° C] below room temperature. The heating equipment should shut off, followed by the fan. 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 (both stages if multistage), and the fan should run (may be a short NOTE: On an AUTO changeover thermostat, the cooling temperature must be set at least 3° F [2° C] above the heating temperature, or display will flash. 6 COOLING SYSTEM SWITCH POSITION OFF CAUTION Do not operate cooling if outdoor temperature is below 50° F [10° C]. Refer to manufacturer’s recommendations. PRESS THIS KEY CHANGE TO LAST LOOK FOR THIS RESPONSE KEY KEY DOWN RELEASED 03 Blank PERIOD SKIP NEXT NOTE: When cooling setting is changed, thermostat will wait up to 5 minutes before turning on the cooling equipment. This delay protects the compressor. 07 Blank 15 Blank 15 1st stage cooling, fan and SYSTEM LED on. 2nd stage cooling also on. 2nd stage cooling off. PERIOD PRESENT SETTING COOL or AUTO (with fan in AUTO) 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 equipment 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. PRESENT SETTING PRESENT SETTING PRESENT SETTING NOTE: On an AUTO changeover thermostat, the heating temperature must be set at least 3° F [2° C] below the cooling temperature, or display will flash. 15 15 1st stage cooling, fan and SYSTEM LED off. NOTE: If single-stage cooling system, press key twice instead of 4 times; once to turn cooling, fan and SYSTEM LED on, second time to turn off. PRESENT SETTING 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 operates directly with the cooling system, and also with heating system on some models. OFF 15 06 Blank 02 Blank 05 Blank BACK 04 Blank COPY 01 Blank 00 Blank 12 See note A 08 Blank 13 09 Microprocessor mask no. and revision no. Blank 14 Blank 14 1st stage heating and SYSTEM LED on. 2nd stage heating also on. 2nd stage heating off. WARMER COOLER AHEAD INSTALLER SELF-TEST (optional) IMPORTANT • AC power must be present on thermostat to conduct self-test. Relays will not toggle, codes will not be present and thermostat will not manually exit self-test without ac power. FROM COPY TO • Five-minute time delay on cooling does not function during self-test. (CHECK EACH POSITION) OFF 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 (Fig. 13). PERIOD CANCEL PERIOD DAY SET HEAT/COOL SET PRESENT DAY/TIME AM PM REPL HEAT or AUTO 1 SET PT BAT ROOM SUN MON TUE WED THU FRI SAT TEMPORARY OUTDOOR MORNING MIDDAY EVENING NIGHT COOL ON HEAT ON SET PRESENT DAY/TIME SET PRESENT DAY/TIME SET PRESENT DAY/TIME M525A 14 14 1st stage heating and SYSTEM LED off. NOTE: If single-stage heating system, press key twice instead of 4 times; once to turn heating and SYSTEM LED on, second time to turn off. SET PRESENT DAY/TIME Fig. 13—All segments on display. 2. Set system switch to OFF. Press AHEAD and BACK and PRESENT SETTING keys at the same time to enter self-test. OFF 3. Press each key as listed below, and look for response listed as key is held down and released. HOLD TEMP 14 10 Blank Normal operating display. For electric heat fan operation—The fan will operate with the heating system when fan switch is in AUTO. HEAT displayed when system switch is in HEAT, COOL when in COOL, HEAT and COOL when in AUTO, neither when in OFF. Also, a four-digit code is displayed, with each digit explained below. RUN 11 PROGRAM 1 A 7 69-0330—3 FIRST DIGIT 0 1 2 3 CYCLE RATE SETTING (CPH at 50% on time for stage 1 on 1-heat models, stage 2 on 2-heat models) 1 3 9 6 THIRD DIGIT 0 1 3 4 5 MANUAL OR AUTO CHANGEOVER Manual Auto Auto Manual Auto SYSTEM SWITCH POSITION HEAT or OFF HEAT or OFF AUTO COOL COOL M13443 SECOND DIGIT 0 1 2 3 4 5 6 STAGES OF HEAT COOL 2 1 2 2 1 1 1 2 0 2 1 0 2 0 FOURTH DIGIT 0 DEGREES F CLOCK (HRS) 12 1 F 24 2 3 4 F F C 12 24 12 5 C 24 6 7 C C 12 24 SYSTEM SWITCH POSITION COOL, AUTO or OFF COOL, AUTO or OFF HEAT HEAT COOL, AUTO or OFF COOL, AUTO or OFF HEAT HEAT This equipment is a Class B digital apparatus which complies with Canadian Radio Interference Regulations, CRC c. 1374. Honeywell Inc. U.S.A.: 1885 Douglas Drive N. Golden Valley, MN 55422-4386 CANADA: 740 Ellesmere Road Scarborough, Ontario M1P 2V9 International Sales Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. PRINTED IN TAIWAN R.O.C. QUALITY IS KEY