Honeywell CHRONOTHERM IV T8624D Installation Instructions Manual Download Page 8

T8624D CHRONOTHERM

®

 IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS

69-1412—1

8

NOTE: If the current time is Daylight Savings Time, 

press Daylight Time until DST is displayed.

4.

Press Run Program.

Viewing or Resetting Timer Settings

When the thermostat activates a timer, the thermostat 
flashes 

Filter 

until the timer resets.

1.

Reset the timer by pressing the 

i

 key until the 

expired timer is displayed.

2.

Press the Time 

s

key to reset the timer. 

3.

Press the Run Program key.

NOTE: You can view the number of days remaining at 

any time by pressing the 

key three or four 

times. If more than one timer is active, all active 
timers show sequentially when pressing the 
 

key several times.

INSTALLER SYSTEM TEST

Use the Installer System Test to check the thermostat 
operation. Refer to Table 4 for a list of the available 
system tests. 

To start the system test:

CAUTION

The minimum off time for compressors is 
bypassed during the Installer System Test. 
Equipment damage can occur if the compressor 
is cycled too quickly.

Press and hold the increase 

!

 and decrease 

"

 keys at 

the same time until 10 appears. All segments of the 
display will be displayed before the 10 appears. 
See Fig. 10 and 11.

Table 4. Tests Available In Installer System Test.

Fig. 10. Display of all the segments of the LCD.

Fig. 11. Display of test number.

Refer to Table 5 for the directions and results of the 
specific tests.

Press Time 

 to advance to the next test and Time 

 to 

go back to the previous test. Press Run Program to exit 
the system test

M14622

Time

Set Program

System

Fan

Run

Program

Hold Temp

Set Current

Day/Time

Wake

Leave

Return

Sleep

Day

Heat/Cool

Settings

Daylight

Time

Daylight

Time

Copy

Set Day/Time

AM

DST

Tue

M14623

Time

Set Program

System

Fan

Run

Program

Run

Program

Hold Temp

Set Current

Day/Time

Wake

Leave

Return

Sleep

Day

Heat/Cool

Settings

Daylight

Time

Copy

Wake

Room

System

Fan

Heat

Auto

AM

DST

Tue

M20243

Filter

Days

M20244

Filter

Days

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.
70-79

Thermostat information including date 
code and software versions are 
displayed.

M14559

Aux Ht

Set Day/Time

Set Program

Mon
Wake Leave Return

Sleep

Outdoor

Room

Filter

Wait

FFan

Em Heat

On

Auto

Off

Cool

Auto

AM

PM

Hold for

Heat Cool

Repl Batt

Recovery

DST

Tue Wed Thu Fri Sat Sun

Days

Temporary Setting

Em Ht

M14612

Summary of Contents for CHRONOTHERM IV T8624D

Page 1: ...ION 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 ...

Page 2: ...lush 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 Fig 2 Mounting the wallplate WIRING All wiring must comply with local electrical codes and ordinances Refer to Fig 3 for typical hookup A letter code is located near each terminal for identification CAUTION Electrical Shoc...

Page 3: ...ate W2 L1 HOT L2 M11309 FAN RELAY Y1 G C THERMOSTAT RC HEAT RELAY 1 R W1 L1 HOT L2 COMPRESSOR CONTACTOR 1 Y2 COMPRESSOR CONTACTOR 2 HEATING TRANSFORMER COOLING TRANSFORMER HEAT RELAY 2 OT OT B HEAT DAMPER OUTDOOR SENSOR COOL DAMPER O 2 2 3 3 3 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 ...

Page 4: ...ram If the daytime energy savings period is not used press the period key Leave or Return until the time is blank The fan setting feature is available on select thermostat models See Owners Guide form number 69 0940 for complete instructions on changing the program Table 2 Default Program Settings M14624 Time Set Program System Fan Run Program Hold Temp Set Current Day Time Wake Leave Return Sleep...

Page 5: ...mbers are shown on the device Example If thermostat does not have a System key Installer Setup Number 12 will not be displayed Review Table 3 factory settings and mark any desired changes in the Actual Setting column When Installer Setup is complete review the settings to confirm that they match the system M14559 Aux Ht Set Day Time Set Program Mon Wake Leave Return Sleep Outdoor Room Filter Wait ...

Page 6: ...mperature is displayed 1 Outdoor temperature is displayed Needs a C7089B1000 Outdoor Temperature Sensor to operate Not Used 25 thru 29 Deadband 30 3 Heating and cooling setpoints can be set no closer than 3 F 1 5 C 4 thru 10 Heating and cooling setpoints can be set no closer than the chosen value 4 4 F 2 C 5 5 F 2 5 C 6 6 F 3 C 7 7 F 3 5 C 8 8 F 4 C 9 9 F 4 5 C 10 10 F 5 C Not Used 31 and 32 Minim...

Page 7: ...ture 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 30 days System run time 0 1 3 4 0 Off 1 10 days 3 60 days 4 120 days Time counted when heat cool or fan is running Humidifier Pad Monitor 44 0 Off 1 2 3 1 90 days 2 180 days 3 365 days ...

Page 8: ...isplayed before the 10 appears See Fig 10 and 11 Table 4 Tests Available In Installer System Test Fig 10 Display of all the segments of the LCD Fig 11 Display of test number Refer to Table 5 for the directions and results of the specific tests Press Time to advance to the next test and Time to go back to the previous test Press Run Program to exit the system test M14622 Time Set Program System Fan...

Page 9: ... Stage one heat comes on The system fan is also energized 12 Stage two heat comes on Stage one heat and system fan remain on 11 Stage two heat turns off 10 Stage one heat and system fan turn off Cooling Equipment System Test Time 30 Change from heating to cooling equipment System Test 31 Stage one cool and system fan come on 32 Stage two cool comes on Stage one cool and system fan remain on 31 Sta...

Page 10: ... soft 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 with out any key presses CHECKOUT Outdoor...

Page 11: ...t come on No power to the thermostat Check for 24 Vac between R and W terminals 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 wiring between thermostat and HVAC equipment replace any broken wires and tighten any...

Page 12: ...gisters 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 display is incorrecta Outdoor sensor is connected incorrectly Refer to C7089B1000 Installation Instru...

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