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T8624C,D (5-1-1 Day
®
Programming) Chronotherm
III Fuel Saver Thermostats
The T8624C,D Chronotherm III Program-
mable Fuel Saver Thermostats provide auto-
matic control of multistage heating/cooling sys-
tems and offer users the highest standard of
comfort and convenience available with energy
savings.
Different schedules may be selected for week-
Models available with automatic or manual heat/
days, Saturday and Sunday.
cool changeover.
Can be programmed in hand (with batteries in-
Batt
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T8624C,D SPECIFICATIONS • ORDERING INFORMATION Specifications SETPOINT RANGE: 45° F to 88° F [7° C to 31° C]. IMPORTANT: The specifications given in this publi- cation do not include normal manufacturing toler- CALIBRATION: Self-calibrating thermostat and ances. Therefore, this unit may not exactly match thermometer to ±1° F. SHIPPING TEMPERATURE: -20° F to +120° F [-29° C the listed specifications. Also, this product is tested to +49° C]. under closely controlled conditions, and some mi- nor di
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T8624C,D SPECIFICATIONS Fig. 1—T8624 Subbase mounting dimensions in in. [mm]. 31 1 32 [50] 13 1 16 [46] 3 4 32 [104] 5 5 16 [135] 5 3 [83] 16 3 4 [121] 4 7 [179] M5181A Fig. 2—Typical thermostat keypad. AM SYSTEM ROOM WED HEAT ON LEAVE TEMPERATURE PRESENT RUN SETTING PROGRAM PERIOD TIME SET SKIP WAKE LEAVE PRESENT NEXT DAY AHEAD WARMER DAY/TIME PERIOD CHANGE HOLD SET BACK COOLER SLEEP RETURN TO LAST TEMP HEAT/COOL PERIOD FAN HEAT AUTO COOL OFF ON AUTO M2998 3 68-0134
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T8624C,D SELECTION/APPLICATION Selection/Application — Fan switching; does fan come on automatically The T8624 Thermostat uses the latest microelec- from thermostat on cooling only (typical gas/ tronic design and control technology to provide home oil heating), or on call for cool and heat (typical and building owners with the highest level of comfort electric heat with single speed fan)? available and optimal energy savings in a package that is • Existing wiring easy to use and easy to live wit
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FAN ON AUTO HEAT AUTO COOL OFF T8624C,D INSTALLATION Installation or disconnects. Remove any existing wallplate or sub- base from wall. To avoid miswiring later, label each RECYCLING NOTICE wire color with the letter or number on the wiring termi- If this control is replacing a control that contains nal as the wire is removed. mercury in a sealed tube, do not place your old control in the trash. Contact your local waste management author- NEW INSTALLATION ity for instructions regarding recycling
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T8624C,D INSTALLATION Fig. 5—Restrict wiring to recessed area Fig. 4—Mounting subbase on wall. surrounding terminals. FOR STRAIGHT WALL INSERTION – STRIP 5/16 in. [8 mm] WIRES THROUGH WALL OPENING FOR WRAPAROUND – STRIP 7/16 in. [11 mm] RESTRICT WIRING TO THIS AREA FRONT VIEW OF WALL TERMINAL AREA ANCHORS (2) WIRING TO BE BELOW TOP SURFACE MOUNTING OF SUBBASE THIS SURFACE HOLES MOUNTING CROSS-SECTIONAL VIEW OF SUBBASE SCREWS (2) TERMINAL AREA M 847 M846 WIRING In multistage heat systems, the
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T8624C,D INSTALLATION Fig. 6—T8624C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. HEATING TRANSFORMER 1 L1 R (HOT) 4 2 L2 HIGH LIMIT 3 POWER SUPPLY C HIGH HEAT 1 HEAT RELAY 1 LIMIT W1 HEAT RELAY 2 HEAT 2 W2 SYSTEM SWITCH HEAT THERMOSTAT LOGIC CIRCUIT AUTO COOL OFF COOLING COOL CONTACTOR Y1 FAN SUBBASE SWITCH FAN RELAY LOGIC/ AUTO CONTROL G CIRCUIT ON 2 L1 RC (HOT) L2 1 COOLING TRANSFORMER 1 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
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T8624C,D INSTALLATION Fig. 7—T8624D 2-stage heat/2-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. L1 R (HOT) 4 2 L2 HIGH 1 HEATING LIMIT 3 POWER TRANSFORMER SUPPLY C HIGH LIMIT HEAT 1 HEAT RELAY 1 SYSTEM W1 SWITCH HEAT 2 HEAT RELAY 2 HEAT THERMOSTAT W2 LOGIC AUTO CIRCUIT COOL COOLING OFF 5 CONTACTOR 2 COOL 2 Y2 SUBBASE LOGIC/ Y1 CONTROL FAN CIRCUIT COOL 1 COOLING SWITCH CONTACTOR 1 AUTO G ON FAN RELAY 2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOA
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T8624C,D INSTALLATION Fig. 8—T8624D 2-stage heat/2-stage cool thermostat with HEAT-OFF-COOL system and AUTO-ON fan switching; auto fan on heat and cool; convertible to auto fan on cool only. L1 (HOT) L2 1 HEATING TRANSFORMER R 5 4 POWER SUPPLY C HIGH LIMIT HIGH FAN LIMIT OPERATION SWITCH W1 3 STAGE 1 ELECTRIC HEAT RELAY HEAT 1 NON-ELECTRIC W2 2 SYSTEM HEAT 2 STAGE 2 SWITCH HEAT RELAY HEAT B THERMOSTAT LOGIC CIRCUIT OFF HEATING DAMPER OR COOL CHANGEOVER RELAY COOLING DAMPER OR CHANGEOVER RELAY
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T8624C,D INSTALLATION After replacing the batteries, reprogramming will be nec- Fig. 9—Cycle rate adjustment. essary. 1A 1B 2A 2B 1 BATTERY PLACEMENT (NOTE CORRECT PLUS CYCLES TIME/TEMP M 372A AND MINUS DIRECTION) SYSTEM 1A 1B 2A 2B PER HOUR DISPLAY GRAVITY OUT 1/2 OUT 1/2 1 24 HR IN AIR/WATER TO 1 TURN TO 1 TURN OUT 1/2 HOT OUT 1/2 IN 3 12 HR WATER TO 1 TURN TO 1 TURN GAS/OIL IN IN If the display goes off when power is lost, either the 6 o WARM AIR (FACTORY SETTING) C IN backup batteries nee
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AUTO TEMPERATURE PRESENT RUN PROGRAM SETTING PERIOD TIME SET SKIP WAKE LEAVE PRESENT AHEAD WARMER NEXT DAY/TIME DAY PERIOD CHANGE HOLD SET BACK COOLER TEMP SLEEP RETURN TO LAST HEAT COOL PERIOD / T8624C,D INSTALLATION • CHECKOUT Fig. 11—Mounting thermostat on subbase. A. B. PM SYSTEM MON RETURN HEAT ON SYSTEM C. M3764 Checkout Move the system switch to COOL and the fan switch HEATING to AUTO. Press COOLER key until the setting is about Move the system switch to HEAT and the fan switch 10° F [6°
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T8624C,D CHECKOUT Look For This Response System Press Switch This Key Position Key Down Key Released OFF 06 Blank WARMER 02 Blank COOLER 05 Blank AHEAD 04 Blank BACK 01 Blank LEAVE REPL AM SET PM BAT PT SUN MON TUE WED THU FRI SAT COOL ON HEAT ON 00 Blank RETURN WAKE LEAVE RETURN SLEEP TEMPORARY M410C (CHECK 12 See note A A WAKE EACH POSITION) OFF 08 Blank SLEEP 13 Microprocessor mask no. and DAY revision no. RUN PROGRAM 09 Blank SET HEAT/COOL Look For This Response System Press SET 14 Blank PRE
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T8624C,D CHECKOUT Stages of Second Digit Heat Cool 021 Cycle Rate Setting (cph at 50% on 122 time for stage 1 on 1-heat models, First Digit stage 2 on 2-heat models) 211 01 312 13 402 29 510 36 620 M5734 Third Manual or Auto System Switch Fourth Clock System Switch Digit Changeover Position Digit Degrees (hrs) Position 0 Manual HEAT or OFF 0 F 12 COOL, AUTO or OFF 1 Auto HEAT or OFF 1 F 24 COOL, AUTO 3 Auto AUTO or OFF 4 Manual COOL 2 F 12 HEAT 5 Auto COOL 3 F 24 HEAT 4 C 12 COOL, AUTO or OFF
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T8624C,D PROGRAMMING THE THERMOSTAT Programming the Thermostat IMPORTANT: With Adaptive Intelligent Recovery™, NOTE: Some models will show 32° F instead of the program the times for when the homeowner wants current temperature, indicating the thermostat is op- the home comfortable. The thermostat will decide erating on backup batteries until the thermostat is how early to begin the temperature changes. mounted on the wallplate and the system is powered. STEP 1 definitions of unfamiliar SET THE C
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T8624C,D PROGRAMMING THE THERMOSTAT is 75° F, the maximum heating setting is temperature disappear from SET LEAVE PT 72° F. the display. MON TUE WED THU FRI ON HEAT LEAVE Program the LEAVE time and tempera- M5021 ture, if desired. Press and release. The display shows LEAVE, but no time AM SET PT AHEAD NOTE: The LEAVE, RETURN or SLEEP or temperature. MON TUE WED THU FRI ON HEAT LEAVE program may be canceled by holding M5022 BACK down the period key until the time and Press and hold until the dis-
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T8624C,D PROGRAMMING THE THERMOSTAT WAKE LEAVE Press and hold until SUN ap- pears on the display. SLEEP RETURN Press WAKE, LEAVE, RE- TURN or SLEEP to select AHEAD the time period. WARMER BACK COOLER Use the AHEAD/BACK keys to set the time and the WARMER/COOLER keys to set the temperature. This completes setting the program schedule and heat- ing temperatures. To set air conditioning, go to Step 3. If cooling temperatures are not being pro- grammed, skip Step 3 and press the RUN AM SET WAKE PT P
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T8624C,D PROGRAMMING THE THERMOSTAT Program the RETURN tem- SET PM PT WARMERperature, if MON TUE WED THU FRI COOL RETURN desired. M5038 COOLER Press and release. The display shows RE- and SET SLEEP PM PT TURN, the time programmed for heating, 78° F. MON TUE WED THU FRI COOL SLEEP M5039 Press and hold until the display shows the desired tem- SET PM PT WARMER perature. MON TUE WED THU FRI COOL SLEEP M5040 COOLER Program the SLEEP tempera- ture, if desired. SET PM PT DAY SAT COOL SLEEP Press and ho
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T8624C,D PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT SET THE SYSTEM AND FAN Use the WARMER/COOLER keys to set the tempera- FAN SWITCHES ON THE SUB- ture. BASE. ON AUTO You have completed programming the cooling tempera- Depending on thermostat model, tures. some of the switch positions shown FAN may not be available on the ther- Press and release to start the program. mostat. Note the positions provided ON AUTO on the subbase, then set the Go to Step 4. M3763 switch(es) as desired. STE
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T8624C,D OPERATING THE THERMOSTAT To temporarily raise or lower the tempera- Press and hold until the de- ture for the current period only: WARMER sired temperature is reached. ON HEAT TEMPORARY The display will flash TEM- M5046 COOLER PORARY until the next pro- grammed time period starts. With the system switch at the PRESENT AUTO position, press and SETTING hold down the key to alter- nate between heating and cool- ing temperature settings for temporary override. Press and release to cancel RU
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T8624C,D OPERATING THE THERMOSTAT NOTE: Moving the system switch also can- day and Sunday settings are SLEEP cels hold. canceled separately. MON TUE WED THU FRI ON HEAT LEAVE CANCELING THE PROGRAM M5052 SETTINGS Press and hold the desired pe- LEAVE riod key until the time and temperature clear from the The thermostat requires time and tempera- display (about three seconds). ture settings in the WAKE period, but any of RETURN the others can be canceled. Weekday, Satur- RUN PM PROGRAM MON RETURN P
