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T8600D Chronotherm® IV
Deluxe Programmable Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The T8600 Chronotherm® IV Deluxe Programmable Refer to Table 1 for a general description of the
Thermostat provides electronic control of 24 Vac single- thermostat. All T8600 thermostats are powered by either
stage heating and cooling systems. heating or cooling system.
Table 1. Description of T8600 Thermostats
System Fan
T8600 System Changeover Selection Selection Comments
D Heat-Cool Automatic Heat-O
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS 3. Remove the wallplate from the wall and drill two Wallplate Installation 3/16 inch (76 mm) holes in the wall (if drywall) as The thermostat can be mounted horizontally on the wall marked. For firmer material such as plaster, drill or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box. two 7/32 inch (5.56 mm) holes. Gently tap anchors Position wallplate horizontally on the wall or on a (provided) into the drilled holes until flush w
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS THERMOSTAT FOR WRAPAROUND FOR STRAIGHT INSERTION INSERTION STRIP STRIP 5/16 IN. (8 MM). YG O B W R RC OT OT 7/16 IN. (11 MM). 3 M4826 HEAT COMPRESSOR COOL 2 RELAY CONTACTOR DAMPER OUTDOOR TEMPERATURE Fig. 6. Correct wiring technique. SENSOR FAN HEAT RELAY DAMPER Mounting Thermostat 2 1. Engage tabs at the top of the thermostat and wall- 1 plate. See Fig. 7. L1 2. Press lower edge of case to close and latch. (HOT) L2 NOTE: To remove the ther
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS • check Self-Test, Using Thermostat Keys • display outdoor temperature (select models), The thermostat keys are used to: • set the system operation, • set current day and time, • set the fan operation. • program times and setpoints for heating and cooling, See Fig. 8 for the location of the keys. • temporarily override program temperatures, • display present setting, • configure Installer Setup, INCREASE TEMPERATURE SET LEAVE TIMES SET
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS System Wait Set Program Set Day/Time Temporary Setting Em Heat Table 2. Default Program Settings. Recovery AM Off Cool Hold for PM Heat Cool Fan Auto Filter Em Ht Aux Ht Days Period Time Setpoint Setpoint Setting Fan Repl Batt Room Outdoor MonTue Wed Thu Fri Sat Sun On Wake Leave Return Sleep DST Heat Cool Auto Wake 6:00 AM 70°F 78°F Auto (21°C) (25.5°C) M14559 Leave 8:00 AM 62°F 85°F Auto Fig. 10. Display of all LCD segments. (16.5°C) (29.
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS Table 3. Thermostat Installer Setup Options. Installer Setup Other Choices Number Factory Setting (Press or key to change) (Press Time ∆ key to Actual Select change) Display Description Display Description Setting Not used. 1 — — — — — Fan 2 0 Conventional 1 Heat pump or electric heat a applications applications where operation . where equipment thermostat controls fan controls fan operation in heat mode. operation in heat mode. Not
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS Table 3. Thermostat Installer Setup Options. (Continued) Installer Setup Other Choices Number Factory Setting (Press or key to change) (Press Time ∆ key to Actual Select change) Display Description Display Description Setting Outdoor 24 0 No outdoor 1 Outdoor temperature is temperature temperature is displayed. Needs a display displayed C70891000 Outdoor (select Temperature Sensor to models) operate. Not used. 25 thru 29 — — — — — De
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS Table 3. Thermostat Installer Setup Options. (Continued) Installer Setup Other Choices Number Factory Setting (Press or key to change) (Press Time ∆ key to Actual Select change) Display Description Display Description Setting Humidifier 44 0 Off 1, 2, 3 1 – 90 days pad monitor. 2 – 180 days 3 – 365 days (Time is counted by calendar days in heat mode.) Ultraviolet air 45 0 Off 1 1 – 365 days treatment (Time is counted by (UV) lamp cal
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS NOTE: You can view the number of days remaining at any time by pressing the i key three or four times. If more than one timer is active, all active System Wait Set Program Set Day/Time Temporary Setting Em Heat timers show sequentially when pressing the i Off Recovery AM key several times. Cool Hold for PM Auto Filter Em Ht Aux Ht Days Fan MonTue Wed Thu Fri Sat Sun Repl Batt Room Outdoor On INSTALLER SYSTEM TEST Heat Cool Auto Wake Lea
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS Table 5. Installer System Test Options. (Continued) Keys to Test Press Number Description 41 Fan comes on. 40 Fan turns off. Key Operation System Test Time ∆ 60 1 Change from fan to key operation system test. NOTE: Press any key and the displayed numbers change. Press Time ∇ to go to the previous test and Time ∆ to go to the next test. The Run Program key does not exit this test. Press Time ∆ or Time ∇ and then the Run Program key to e
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS TROUBLESHOOTING GUIDE Table 6. Troubleshooting Guide. Symptom Possible Cause Action Display does not Thermostat is not being • Check for 24 Vac between R and W terminals. come on. powered. — 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
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T8600D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTATS Table 6. Troubleshooting Guide. (Continued) Symptom Possible Cause Action Heating or cooling Heat or cool circuit is opening Add resistor in parallel with load or install interface relay. come on up or becoming high momentarily and impedance. shut off System on indicator Fan operation set for 0 (con- Enter Installer Setup number 2 and reconfigure the fan (flame=heat, ventional heat) when it should operation. snowflake=cool) is be set for 1
