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T8624D Chronotherm® IV
Deluxe Programmable
Multistage Thermostats
INSTALLATION INSTRUCTIONS
APPLICATION
The T8624D Chronotherm® IV Deluxe Programmable Multistage Thermostats provides electronic control of 24 Vac single-zone multistage systems.
Refer to Table 1 for a general description of the thermostats. All T8624 thermostats require a common wire to supply power.
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Table 1. |
Description of T8624 Thermostats. |
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Fan |
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T8624 |
Changeover |
System Selection |
Selection |
Comments |
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D |
Automatic |
Heat-Off-Cool-Auto |
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On-Auto |
System and fan selections are done by keyboard. |
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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.
® U.S. Registered Trademark |
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Copyright © 2002 Honeywell • |
• All Rights Reserved |
69-1412-1 |
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T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS
Wallplate Installation |
Position wallplate horizontally on the wall or on a |
The thermostat can be mounted horizontally on the wall |
2 in. x 4 in. (50.8 mm x 101.6) mm wiring box. |
or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box. |
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YES NO
NO
1.5 METERS
(5 FEET)
NO
M10856
Fig. 1. Typical location of thermostat.
1.Position and level the wallplate (for appearance only). The thermostat will function correctly 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 3/16 inch (76 mm) holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32 inch (5.56 mm) 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.
WALL
WIRES
THROUGH WALL
WALL
ANCHORS (2)
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 Shock Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before beginning wiring.
1.Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 4.
IMPORTANT
Use 18 gauge, color-coded thermostat cable for proper wiring.
2.Securely tighten each terminal screw.
3.Push excess wire back into the hole.
4.Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat.
MOUNTING |
HOLES |
MOUNTING
SCREWS
M15044
Fig. 2. Mounting the wallplate.
69-1412—1 |
2 |
T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS
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Mounting Thermostat |
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THERMOSTAT |
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1. |
Engage tabs at the top of the thermostat and wall- |
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RC |
Y1 |
G |
O |
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Y2 |
C |
B |
W2 |
W1 |
R |
OT OT |
2. |
plate. See Fig. 5. |
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2 |
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Press lower edge of case to close and latch. |
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FAN |
C |
O |
MPRESS |
O |
R |
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HEAT |
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NOTE: To remove the thermostat from the wall, first pull |
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OUTDOOR |
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out at the bottom of the thermostat; remove top |
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RELAY |
CONTACTOR 2 |
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RELAY |
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SENSOR |
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2 |
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last. |
COMPRESSOR |
COOL |
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HEAT |
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CONTACTOR 1 |
DAMPER |
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HEAT |
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DAMPER |
RELAY |
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3 |
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1 |
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1 |
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L1 |
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L1 |
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(HOT) |
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(HOT) |
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L2 |
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L2 |
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1 |
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COOLING |
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HEATING |
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A. ENGAGE TABS |
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TRANSFORMER |
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TRANSFORMER |
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AT TOP OF |
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THERMOSTAT |
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD |
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AND WALLPLATE. |
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PROTECTION AS REQUIRED. |
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2 JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM.
3 |
CAN BE USED FOR CHANGEOVER VALVE ON HEAT |
M11309 |
PUMP SYSTEMS.
Fig. 3. Typical hookup of T8624D in a heat pump system.
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B. PRESS LOWER |
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EDGE OF CASE |
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FOR WRAPAROUND |
TO LATCH. |
M14628 |
FOR STRAIGHT INSERTION |
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INSERTION STRIP |
STRIP 5/16 IN. (8 MM). |
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7/16 IN. (11 MM). |
Fig. 5. Mounting thermostat on wallplate. |
M4826
Fig. 4. Correct wiring technique.
3 |
69-1412—1 |
T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE MULTISTAGE THERMOSTATS
INCREASE TIME SETTING |
SET WAKE TIMES |
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OR SCROLL FORWARD |
AND SETPOINTS |
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THROUGH INSTALLER SETUP |
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AND SYSTEM TEST |
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SET CURRENT |
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DAY AND TIME |
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RETURN TO |
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NORMAL |
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OPERATIONS |
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ENTER |
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INDEFINITE |
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Time |
OR TIMED |
Run |
Set Current |
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HOLD MODE |
Program |
Day/Time |
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Hold Temp |
Day |
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SET CURRENT OR |
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PROGRAM DAY |
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Daylight |
Copy |
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Time |
CHANGE BETWEEN |
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DAYLIGHT SAVINGS |
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AND STANDARD TIME |
COPY ONE PROGRAMMED |
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DAY TO ANOTHER DAY |
SET LEAVE TIMES |
SET RETURN TIMES |
INCREASE TEMPERATURE |
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AND SETPOINTS |
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AND SETPOINTS |
SETTING OR SCROLL |
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FORWARD THROUGH |
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INSTALLER SETUP OPTIONS |
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DECREASE TEMPERATURE |
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SETTING OR SCROLL |
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BACKWARD THROUGH |
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INSTALLER SETUP OPTIONS |
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DISPLAY INFORMATION |
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SUCH AS PRESENT |
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SETTINGS AND OUTDOOR |
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TEMPERATURE |
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Set Program |
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SET SLEEP TIMES |
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Wake |
Leave |
Return |
Sleep |
AND SETPOINTS |
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Heat/Cool |
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System |
Fan |
SELECT FAN |
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Settings |
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OPERATION |
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SELECT SYSTEM |
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OPERATION |
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DECREASE TIME SETTING OR |
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CHANGE BETWEEN |
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HEATING AND COOLING |
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SCROLL BACKWARD THROUGH |
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SETPOINTS |
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INSTALLER SETUP AND SYSTEM TEST |
M14624 |
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Fig. 6. T8624D key locations and descriptions.
Using Thermostat Keys
The thermostat keys are used to:
•set current day and time,
•program times and setpoints for heating and cooling,
•temporarily override program temperatures,
•display present setting,
•configure Installer Setup,
•check System Test,
•display outdoor temperature (select models),
•set the system operation,
•set the fan operation.
See Fig. 6 for the location of the keys.
SETTINGS
System and Fan Settings
The system default setting is Heat and the fan default setting is Auto. Use the System and Fan keys to change the settings. See Fig. 7. The fan settings can be set for each program period individually. The system selection is for all the program periods.
System settings control the thermostat operation as follows:
Heat: The thermostat controls the heating. Off: Both the heating and cooling are off. Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between heating and cooling operation, depending on the indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
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Time |
Set Program |
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Run |
Set Current |
Wake |
Leave |
Return |
Sleep |
Program |
Day/Time |
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Hold Temp |
Day |
Heat/Cool |
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System |
Settings |
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System |
Fan |
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Daylight |
Copy |
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Time |
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Fan |
M14625
Fig. 7. T8624D System and Fan key locations.
NOTE: Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard.
Temperature Settings
Refer to Table 2 for the default program. 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.
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Heat |
Cool |
Fan |
Period |
Time |
Setpoint |
Setpoint |
Setting |
Wake |
6:00 AM |
70°F |
78°F |
Auto |
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(21°C) |
(25.5°C) |
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Leave |
8:00 AM |
62°F |
85°F |
Auto |
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(16.5°C) |
(29.5°C) |
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Return |
6:00 PM |
70°F |
78°F |
Auto |
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(21°C) |
(25.5°C) |
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Sleep |
10:00 PM |
62°F |
82°F |
Auto |
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(16.5°C) |
(28°C) |
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69-1412—1 |
4 |
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