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INSTALLATION INSTRUCTIONS

69-1507-2

T8602D 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 and 24 Vac cooling. 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

D

Heat-Cool

Automatic

Heat-Off-Cool-Auto

On-Auto

System and fan selections are made on 
keyboard.

Summary of Contents for T8602D

Page 1: ...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 goo...

Page 2: ...RING 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 ther...

Page 3: ...M 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 ...

Page 4: ...n heating and cooling operation depending on the indoor temperature Fan settings control the system fan On Fan operates continuously Auto Fan operates with equipment Fig 10 Thermostat System and Fan key locations M14624 Time Set Program System Fan Run Program Hold Temp Set Current Day Time Wake Leave Return Sleep Day Heat Cool Settings Daylight Time Copy INCREASE TEMPERATURE SETTING OR SCROLL FORW...

Page 5: ... 11 and 12 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 backward press the Time key To exit the Installer Setup press Run Program Fig 11 Display of all LCD segments Fig 12 Display of Installer Setup number and setting CAUTION Heat Pump and Electric Heat System Configuration Hazard Can cause equi...

Page 6: ...arly so setpoint is reached by start of program period 1 Conventional recovery system 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 and 18 Extended fan operation in heating a 19 0 No extended fan operation after the call for heat e...

Page 7: ...t Used 36 Temperature display adjustment 37 0 No difference in displayed temperature and actual room temperature 3 thru 3 1 Display adjusts to 1 F higher than actual room temperature 2 Display adjusts to 2 F higher than actual room temperature 3 Display adjusts to 3 F higher than actual room temperature 1 Display adjusts to 1 F lower than actual room temperature 2 Display adjusts to 2 F lower than...

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: ... 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 M14559 Aux Ht Set Day Time Set Program Mon Wake Le...

Page 10: ...ware 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 Temper...

Page 11: ...ircuit 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 ...

Page 12: ...the furnace 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 temperat...

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