background image

® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.  •  

  • All Rights Reserved 

INSTALLATION INSTRUCTIONS

69-1510-4

T8602D Chronotherm® IV

Programmable Thermostats

APPLICATION

The T8602 Chronotherm® IV Programmable Thermostat 
provides electronic control of 24 Vac single-stage heating 
and cooling systems or 750 mV heating and 750 mV 

cooling. Refer to Table 1 for a general description of the 
thermostat. All T8602 Thermostats are powered by 
batteries.

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 1.5m (5 ft) 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 50.8 mm x 101.6 mm (2 in. x 4 in.) wiring box. 
Position wallplate horizontally on the wall or on a 
50.8 mm x 101.6 mm (2 in. x 4 in.) wiring box.

1.

Position and level the wallplate (for appearance 
only). The thermostat will function properly even 
when not level. 

2.

Use a pencil to mark the mounting holes. See Fig. 
2.

3.

Remove the wallplate from the wall and drill two 
4.76 mm (3/16 in.) holes in the wall (if drywall) as 
marked. For firmer material such as plaster, drill 
two 5.56 mm (7/32 in.) holes. Gently tap anchors 
(provided) into the drilled holes until flush with the 
wall.

4.

Position the wallplate over the holes, pulling wires 
through the wiring opening.

5.

Loosely insert the mounting screws into the holes.

6.

Tighten mounting screws.

Table 1. Description of T8602 Thermostats.

T8602

System

Changeover

System

Selection

Fan

Selection

Comments

D

Heat-Cool

Manual or 
Automatic 

Selectable

Heat-Off-Cool or

Heat-Off-Cool-Auto

On-Auto

System and fan selections are done 
by keyboard.

Summary of Contents for Chronotherm IV T8602D

Page 1: ...tat about 1 5m 5 ft 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 Th...

Page 2: ... Securely tighten each terminal screw 3 Push excess wire back into the hole 4 Plug the hole with nonflammable insulation to pre vent drafts from affecting the thermostat Fig 3 Typical hookup in heat and cool system with two transformers 1 5 METERS 5 FEET YES NO NO NO M10856 WIRES THROUGH WALL WALL MOUNTING HOLES M15044 MOUNTING SCREWS WALL ANCHORS 2 L1 HOT L2 M10855 FAN RELAY Y G THERMOSTAT RC HEA...

Page 3: ...PPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED CAN BE USED FOR CHANGEOVER VALVE ON SINGLE STAGE HEAT PUMP SYSTEMS AVAILABLE ON SELECT MODELS OT WIRES MUST HAVE A SEPARATE CABLE FROM THE THERMOSTAT CABLE 2 2 2 1 3 OT OT OUTDOOR TEMPERATURE SENSOR 3 RC W MILLIVOLT HEATING ONLY WALLPLATE R M2931 TH TH PP PP MILLIVOLTAGE GAS CONTROL LIMIT CONTROL MILLIVOLTAGE GENERATOR PILOTSTAT CON...

Page 4: ...sly Auto Fan operates with equipment Fig 10 Thermostat System and Fan key locations NOTE Always press the keys with your fingertip or sim ilar blunt tool Sharp instruments like a pen or pencil point can damage the keyboard 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 S...

Page 5: ...ed See Fig 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 Electric Heat Configuration Hazard Can cause equipment damag...

Page 6: ...uto only Adaptive Intelligent Recovery control 13 1 Conventional recovery system starts recovery at programmed time Adaptive Intelligent Recovery control is activated system starts early so setpoint is reached by start of program period Not Used 14 thru 15 Clock format 16 0 12 hour clock format 1 24 hour clock format Not Used 17 thru 23 Outdoor temperature display select models 24 0 No outdoor tem...

Page 7: ...s to 1 5 C higher than actual room temperature 5 Display adjusts to 5 C lower than actual room temperature 1 0 Display adjusts to 1 0 C lower than actual room temperature 1 5 Display adjusts to 1 5 C lower than actual room temperature Furnace Air Filter Timer 43 0 Off 1 2 3 4 1 10 days 2 30 days 3 60 days 4 120 days Time counted when heat cool or fan is running Humidifier Pad Monitor 44 0 Off 1 2 ...

Page 8: ...gram to exit the System Test 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 Program Hold Temp Set Current Day Time Wake Leave Return Sleep Day Day Heat Cool Settings Daylight Time Copy Set Day Time PM Tue M14621 Time Set Pr...

Page 9: ...escription Heating Equipment System Test Time 10 Enter heating equipment system test 11 Heat comes on When Installer Setup number 2 is 1 the system fan is also energized 10 Heat and system fan turn off Cooling Equipment System Test Time 30 Change from heating to cooling equipment system test 31 Cool and system fan come on 30 Cool and system fan turn off Fan Equipment System Test Time 40 Change fro...

Page 10: ... 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 Temperatur...

Page 11: ...C 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 to respond System selection is not set to Heat Set system selection to Heat Heating setpoint is below ...

Page 12: ... fan operation Conventional heating equipment turns on the fan when 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 Thermosta...

Reviews: