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®
T8602C Chronotherm IV
Deluxe Programmable
Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
®
The T8602 Chronotherm IV Deluxe Programmable Thermostat provides electronic control of 24 Vac single-stage
heating and cooling systems or 750 mV heating system. Refer to Table 1 for a general description of the thermostat. All
T8602 thermostats are powered by batteries.
Table 1. Description of T8602 Thermostats.
Fan
T8602 System Changeover System Selection Selection Comments
C Heat-Cool Manual Hea
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS NO YES NO 5 FEET NO [1.5 METERS] M10106 Fig. 1. Typical location of thermostat. 1. Position and level the wallplate (for appearance WIRING only). The thermostat functions correctly even when not level. All wiring must comply with local electrical codes and 2. Use a pencil to mark the mounting holes. ordinances. Refer to Fig. 3 and 6 for typical hookup. A See Fig. 2. letter code is located near each terminal for identification. 3. Rem
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS THERMOSTAT THERMOSTAT YR GO B W OT OT YG O B W R RC OT OT 1 3 PILOTSTAT HEAT CONTROL COMPRESSOR COOL (IF USED) 2 RELAY CONTACTOR DAMPER OUTDOOR TH TEMPERATURE SENSOR TH/ PP OUTDOOR FAN HEAT LIMIT TEMPERATURE RELAY DAMPER CONTROL SENSOR PP 2 MILLIVOLTAGE MILLIVOLTAGE GENERATOR 1 GAS CONTROL L1 (HOT) 1 AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A L2 SEPARATE CABLE FROM THE THERMOSTAT CABLE. M20270 TRANSFORMER Fig. 6. T8602 typical milli
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS • configure Installer Setup, Using Thermostat Keys • check Self-Test, The thermostat keys are used to: • display outdoor temperature (select models), • set current day and time, • program times and setpoints for heating and cooling, See Fig. 9 for location of the keys. • temporarily override program temperatures, • display present setting, NOTE: Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a p
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS FAN OPERATION SWITCH The thermostat fan operation switch, labeled FUEL — To advance to the next Installer Setup, press the SWITCH in Fig. 11 is factory set in the F position. This is Time ∆ key. the correct setting for most systems. If your system is an — To change a setting, use the increase or electric heat system, set the switch to E. The E setting decrease key. allows the fan to turn on immediately with the heating or — To scroll t
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS Table 3. Thermostat Installer Setup Options. Installer Setup Other Choices Number (Press Factory Setting (Press or key to change) Time ∆ key to Actual Select change) Display Description Display Description Setting Not Used. 1 thru 3 — — — — — Heating cycle 4 6 6—6 cph used for 1, 3 or 9 1—1 cph used for radiant rate. conventional heat floor heat, gravity system 3—3 cph used for hot water systems or high efficiency furnaces 9—9 cph us
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS Table 3. Thermostat Installer Setup Options. (Continued) Installer Setup Other Choices Number (Press Factory Setting (Press or key to change) Time ∆ key to Actual Select change) Display Description Display Description Setting Temperature 37 0 No difference in 3 thru -3 1—Display adjusts to 1°F display displayed higher than actual room adjustment. temperature and temperature. actual room 2—Display adjusts to 2°F temperature. higher th
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS Setting Current Day and Time 1. Press Set Current Day/Time. Set Day/Time AM NOTE: On initial powerup or after an extended power Time Set Program Run Set Current Day/Time Wake Leave Return Sleep Daylight Program loss, 1:00 pm flashes on the display until a Time Hold Temp Day Heat/Cool System Fan Tue Settings Daylight DST Time Copy key is pressed. M14622 4. Press Run Program. Set Day/Time PM System Time Set Program Heat Run Set Current
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat operation. Refer to Table 4 for a list of the available System system tests. Wait Set Program Set Day/Time Temporary Setting Heat Recovery AM Off Hold for Cool PM Days CAUTION Mon Tue Wed Thu Fri Sat Sun Repl Batt Room Equipment Damage Hazard. Wake Leave Return Sleep DST Heat Cool Minimum compressor off-time is bypassed M19014 during Installer System Test. Av
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS THERMOSTAT INFORMATION 1. Press the Time ∆ key to access the thermostat 4. Press the increase key again to display the soft- information. ware revision number. (Example: 001 = Revision number 1). M14613 M14616 2. Press the increase key to display the production 5. Press the increase key again to display the date code. The first two large digits are the month EEPROM identification code. and the third digit is the last digit of the y
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS TROUBLESHOOTING GUIDE Table 6. Troubleshooting Guide. Symptom Possible Cause Action Display does not Thermostat is not being • Check if batteries are present and installed correctly. come on. powered. — If batteries are present and installed correctly, replace thermostat. Temperature Room temperature display has Enter Installer Setup number 37 and reconfigure the display. display is incorrect. been reconfigured. Thermostat is configured f
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® T8602C CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS Table 6. Troubleshooting Guide. (Continued) Symptom Possible Cause Action System on indicator Fan operation set for F Set Fan Operation switch (Fuel switch). (flame=heat, (conventional heat) when it snowflake=cool) is should be set for E (electric displayed, but no heat). warm or cool air is Conventional heating equipment Wait a minute after seeing the on indicator and then check the coming from the turns on the fan when the registers
