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®
T8624D Chronotherm IV Deluxe
Programmable Thermostat
PRODUCT DATA
Models available with outdoor temperature sensor
capability for homeowner convenience. The sensor is
also more accurate than a thermometer.
Configurable features allows one model to be used to
replace many different models (less inventory, no
longer need to carry separate models to get these
features).
— °F or °C temperature display;
— automatic or manual changeover;
— electric or conventional heat fan operation;
— adjustabl
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Temperature: SPECIFICATIONS Ratings: Operating Ambient: 40°F to 110°F (4°C to 43°C). Important Shipping: -30°F to +150°F (-34°C to +65°C). The specifications given in this publication do not Display Accuracy: include normal manufacturing tolerances. Therefore, ±1°F (±0.5°C). this unit might not exactly match the listed specifications. This product is tested and calibrated Setpoint: under closely controlled conditions, and some minor Range: d
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Dimensions: INSTALLATION See Fig. 1. 3-5/8 (92) When Installing this Product… 2-3/4 (70) 1. Read these instructions carefully. Failure to follow the 3/8 (10) instructions can damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the 1-13/16 product to make sure the product is suitable for your (46) application. 3. Installer must be a trained, experienced service 3-1/2 technician. (89) 4. Aft
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT YES NO NO 5 FEET [1.5 METERS] NO M10106 Fig. 2. Typical location of thermostat. WIRING WALL All wiring must comply with local electrical codes and WIRES ordinances. Follow equipment manufacturer wiring THROUGH WALL instructions when available. Refer to Fig. 14 for typical hookup. A letter code is located near each terminal for identification. Refer to Table 4 for terminal designations. WALL ANCHORS (2) CAUTION Disconnect power before wiring
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 4. Terminal Designations and Descriptions. Standard Alternate Terminal Terminal Designations Designations Typical Connection Function Terminal Type B— Heat damper or changeover valve Output 24V powered contact a CB , C, X1, X2 Common Input GF Fan relay Output 24V powered contact OR Cool damper or changeover valve Output 24V powered contact OT, OT — Outdoor temperature sensor (C7089B) Input — RV 24V system or heating transformer Input
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT System settings control the thermostat operation as follows: SETTINGS Heat: The thermostat controls the heating. Off: Both the heating and cooling are off. Cool: The thermostat controls the cooling. Using Thermostat Keys Auto: The thermostat automatically changes between The thermostat keys are used to: heating and cooling operation, depending on the indoor • set current day and time, temperature. • program times and setpoints for heating an
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT NOTE: Always press the keys with your fingertip or similar —To change a setting, use the increase ▲ or blunt tool. Sharp instruments like a pen or pencil decrease ▼ key. point can damage the keyboard. —To scroll the Installer Setup numbers backwards, press the Time ▼ ▼ key. —To exit the Installer Setup, press Run Program. Temperature Settings Refer to Table 5 for the default program. If the daytime energy savings period is not used, press th
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 6. Thermostat Installer Setup Options. Installer Setup Other Choices Number (Press Factory-Setting (Press ▲ or ▼ key to change) Time ▲ key to Actual change) Setting Select Display Description Display Description Not used 1 thru 3 — — — — — 46 Stage 1 3 or 9 Heating cycle 3—3 cph used for steam a rate systems 5 Stage 2 6—6 cph factory setting for all stages of system 9— 9 cph used for electric heat Not used 6 thru 11 — — — — — Sys
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 6. Thermostat Installer Setup Options (continued). Installer Setup Other Choices Number (Press Factory-Setting (Press ▲ or ▼ key to change) Time ▲ key to Actual change) Setting Select Display Description Display Description Not used 31 and 32 — — — — — Minimum off time 33 5 5 minute minimum off 0 thru 4 Minimum number of minutes for the compressor time for the (0 thru 5) the compressor will compressor be off between calls for the
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 2. Press Day until the current day is displayed. Set Program Start Time Set Day/Time Temporary Setting Enrg Sav Hold for NOTE: Sun=Sunday, Mon=Monday, Tue=Tuesday, AM Em Ht Room Wed=Wednesday, Thu=Thursday, Fri=Friday, PM Aux Ht %Humid Sat=Saturday. MonTueWedThuFriSatSun Heat Cool Outdoor WakeLeaveReturnSleep In Recovery Auto Repl Batt System DST Fan Set Day/Time Em Heat OffCool Auto Wait OnAuto PM Time Set Program Run Set Current Wake Leave
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 8. Installer System Test Options. Key to Test Press Number Description Heating Equipment System Test Time ▲ 10 Enter heating equipment system test. ▲ 11 Stage-one heat comes on. The system fan is also energized. ▲ 12 Stage-two heat comes on. Stage-one heat and system fan remain on. ▼ 11 Stage-two heat turns off. ▼ 10 Stage-one heat and system fan turn off. Cooling Equipment System Test Time ▲ 30 Change from heating to cooling equip
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT ▲ ▲ and ▼ ▼ keys provide quick temporary temperature PROGRAMMING changes to increase comfort. The Hold Temp key provides energy efficient operation for extended The keyboard is located behind the thermostat cover with periods of time. three frequently used keys by the display. The thermostat display shows day, time, program period, temperature, system Before starting the programming procedure, use Table 9 to and fan operation selection. orga
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Setting the Current Day and Time Programming the First Day Start by programming the Wake time and temperature (and fan operation on select models) for any one day: IMPORTANT Always press the keys with your fingertip or similar 1. Press Wake. blunt tool. Sharp instruments like pens and pencil points can damage the keyboard. Setting Set Program Start Time AM Time Set Program 1. Press Set Current Day/Time. Run Set Current Leave Program Day/Time
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 5. Press Heat/Cool Settings to switch to other system 3. Press Copy. temperature setpoint. NOTE: The program times are the same for both Copy Time Set Program Run Set Current Wake Leave Return Sleep Mon Program Day/Time heating and cooling. Heat/Cool Hold Temp Day System Fan Settings Daylight Copy Time M10326 Set Program Start Time Setting AM Time Set Program Heat/Cool Run Set Current Wake Leave Return Sleep Mon Cool 4. Press Day until the d
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 4. Repeat steps 2 and 3 for all the periods to be cleared. NOTE: The display changes from the setpoint to the room temperature after approximately 5. Press Run Program. 3 seconds. 5. Press Run Program to cancel the Hold and to return to Setting Temporary Temperatures the program. Changing Temperature Setting Until the Next Program Period Changing Temperature Setting Until a Designated Press increase ▲ or decrease ▼ key until the desired
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 6. Press increase ▲ or decrease ▼ key to adjust the OPERATION temperature setting, if desired. (Example: Cool 84° = cooling equipment will operate when the room temperature is above 84°F) P+I Control The thermostat microprocessor based control requires that NOTE: In this example, the thermostat uses the Hold the user understands temperature control and thermostat setting for eighteen days and returns to the performance. A conventional el
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 11. Default Time, Setpoint and Fan Settings. Operation Sequence The thermostat energizes specific terminals depending what Heat Cool Fan the Fan and System are set to. The LCD will display the time, Period Time Setpoint Setpoint Setting room temperature, system and fan selection. Symbols will be Wake 6:00 AM 70°F (21°C) 78°F Auto displayed when the heating, cooling or fan is energized. See (25.5°C) Table 10 for specific information. Le
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT TROUBLESHOOTING GUIDE Refer to Table 12 for troubleshooting information. Table 12. Troubleshooting Information. Symptom Possible Cause Action Display will not Thermostat is not being powered. • Check for 24 Vac between R and C terminals. come on. — If missing 24 Vac: — check if the circuit breaker is tripped—reset the circuit breaker. — check if the system fuse is blown—replace the fuse. — check if the power switch on the HVAC equipment i
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 12. Troubleshooting Information (continued). Symptom Possible Cause Action Cooling will not No power to the thermostat. • Check for 24 Vac between R and C. come on. — If missing 24 Vac: — check if the circuit breaker is tripped—reset the circuit breaker. — check if the system fuse is blown—replace the fuse. — check if the power switch on the HVAC equipment is in the Off position—set to the On position. — check wiring between thermos
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® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT WIRING DIAGRAM (FIG. 14) THERMOSTAT O B OT OT RC Y1 G Y2 C W2 W1 R 2 HEAT FAN COMPRESSOR OUTDOOR RELAY RELAY CONTACTOR 2 SENSOR 2 COOL COMPRESSOR HEAT HEAT DAMPER CONTACTOR 1 RELAY DAMPER 1 3 3 1 L1 L1 (HOT) (HOT) L2 L2 1 COOLING HEATING TRANSFORMER TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM. CAN BE USED FOR CHANGEO
