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INSTALLATION INSTRUCTIONS

69-1670

T8602C Chronotherm

® 

IV

Deluxe Programmable

Thermostats

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.

MERCURY NOTICE

If this control is replacing a control that contains 
mercury in a sealed tube, do not place your old 
control in the trash. Dispose of properly.

Contact your local waste management authority 
for instructions regarding recycling and the 
proper disposal of the old control. 

INSTALLATION

When Installing this Product...

1.

Read these instructions carefully. Failure to follow 
the instructions can damage the product or cause 
a hazardous condition.

2.

Check the ratings given in the instructions and on 
the product to make sure the product is suitable for 
your application.

3.

Installer must be a trained, experienced service 
technician.

4.

After completing installation, use these instructions 
to check out the product operation.

Location

Install the thermostat about  5 ft (1.5m) above the floor in 
an area with good air circulation at average temperature. 
See Fig. 1.

Do not install the thermostat where it can be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun or appliances.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall 

behind the thermostat.

Wallplate Installation

The thermostat can be mounted horizontally on the wall 
or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box. 
Position wallplate horizontally on the wall or on a 
2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.

T8602

System

Changeover

System Selection

Fan

Selection

Comments

C

Heat-Cool

Manual

Heat-Off-Cool

On-Auto

System and fan selections are made on 
keyboard.

Summary of Contents for T8602C

Page 1: ... product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After completing installation use these instructions to check out the product operation Location Install the thermostat about 5 ft 1 5m above the floor in an area with good a...

Page 2: ...ING All wiring must comply with local electrical codes and ordinances Refer to Fig 3 and 6 for typical hookup A letter code is located near each terminal for identification CAUTION Electrical Hazard Can cause electric shock or equipment damage Disconnect power before wiring 1 Loosen the terminal screws on the wallplate and connect the system wires See Fig 7 IMPORTANT Use 18 gauge color coded therm...

Page 3: ... THE THERMOSTAT CABLE 2 2 2 1 3 OT OT OUTDOOR TEMPERATURE SENSOR 3 RC L1 HOT L2 M10348 FAN RELAY Y G THERMOSTAT RC HEAT RELAY R W L1 HOT L2 COMPRESSOR CONTACTOR HEATING TRANSFORMER COOLING TRANSFORMER B HEAT DAMPER COOL DAMPER O 2 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM CAN BE USED FOR C...

Page 4: ...r s Guide for complete instructions on changing the program Table 2 Default Program Settings M14880 Time Set Program System Fan On Auto Run Program Hold Temp Set Current Day Time Wake Leave Return Sleep Day Heat Cool Settings Daylight Time Copy INCREASE TEMPERATURE SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP OPTIONS DECREASE TEMPERATURE SETTING OR SCROLL BACKWARD THROUGH INSTALLER SETUP OPTI...

Page 5: ...enter the installer setup press and hold the information i key with the increase and decrease keys until the first number is displayed All display segments appear for approximately three seconds before the number is displayed See Fig 12 and 13 To advance to the next Installer Setup press the Time key To change a setting use the increase or decrease key To scroll the Installer Setup numbers backwar...

Page 6: ...tem starts recovery at programmed time Degree temperature display 14 0 Temperature is displayed in F 1 Temperature is displayed in C Not Used 15 Clock format 16 0 12 hour clock format 1 24 hour clock format Not Used 17 thru 23 Outdoor temperature display models with OT terminals 24 0 No outdoor temperature is displayed 1 Outdoor temperature is displayed Needs a C7089B1000 Outdoor Temperature Senso...

Page 7: ... higher than actual room temperature 1 Display adjusts to 1 F lower than actual room temperature 2 Display adjusts to 2 F lower than actual room temperature 3 Display adjusts to 3 F lower than actual room temperature Furnace Air Filter Timer 43 2 90 days calendar days 0 1 3 4 0 off 1 30 days 3 180 days 4 365 days Time is counted by calendar days in any mode Humidifier Pad Monitor 44 0 Off 1 2 3 1 ...

Page 8: ...days remaining at any time by pressing the i key three or four times If more than one timer is active all active timers show sequentially when pressing the i key several times M14619 Time Set Program System Fan Run Program Hold Temp Set Current Day Time Set Current Day Time Wake Leave Return Sleep Day Heat Cool Settings Daylight Time Copy Set Day Time Mon PM M14620 Time Set Program System Fan Run ...

Page 9: ...e to go to the previous test and Time to go to the next test The Run Program key will not exit this test Press Time or Time and then the Run Program key to exit Test Number System Test Description 10 19 Heating equipment can be turned on and off 30 39 Cooling equipment can be turned on and off 40 49 Fan equipment can be turned on and off 60 0 to 60 19 Keyboard keys test M19014 Mon Wake Leave Retur...

Page 10: ...are identification code Example 02 software ID code 2 4 Press the increase key again to display the soft ware revision number Example 001 Revision number 1 5 Press the increase key again to display the EEPROM identification code Example 314 EEPROM ID 314 6 Press the Run Program key to exit the System Test The System Test times out after four minutes without any key presses CHECKOUT Outdoor Tempera...

Page 11: ...rcuit 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 thermostat and HVAC equipment replace any broken wires and tighten any loose connections If 24 Vac is present proceed with troubleshooting Thermostat minimum off time is activated Wait up to five minutes for the system t...

Page 12: ...ce has warmed up to a setpoint Wait a minute after seeing the on indicator and then check the registers Heating or cooling equipment is not operating Verify operation of heating or cooling equipment in self test Outdoor tempera ture not displayeda Option not activated Enter Installer Setup number 24 and set to 1 Thermostat must have OT terminals and a C7089B1000 installed Outdoor temperature displ...

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