Honeywell T8501D User Manual

Page 1

T8501D

Deluxe Zone Thermostat

INSTALLATION INSTRUCTIONS

APPLICATION

The T8501 Deluxe Zone Thermostat provides electronic control of 24 Vac single-stage zoned heating and cooling systems. Refer to Table 1 for a general description of the thermostat.

Table 1. Description of T8501 Thermostat.

Model Application Powering Method Changeover System Selection Fan Selection

T8501D Zone 1 on MABS II or

TotalZone® system

RECYCLING NOTICE

If this control is replacing a control that contains mercury in a sealed tube, do control in the trash.

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

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.

Requires common wire to power supply

not

place your old

Automatic or

Manual

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. wiring box. Position wallplate horizontally on the wall or on a 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

3/16 inch holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32 inch 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.

Heat-Off-Cool-Auto On-Auto

X-XX UL

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T8501D DELUXE ZONE THERMOSTAT

WIRES THROUGH WALL

WALL ANCHORS (2)

Fig. 2. Mounting the wallplate.

YES

5 FEET

[1.5 METERS]

Fig. 1. Typical location of thermostat.

WALL

Wiring

All wiring must comply with local electrical codes and ordinances. Refer to Fig. 3 and 4 for typical hookups. A letter code is located near each terminal for identification.

1. Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 5.

IMPORTANT

MOUNTING HOLES

MOUNTING SCREWS

M6530

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.

M10106

CAUTION

Disconnect power before wiring to prevent electrical shock or equipment damage.

Use 18 gauge, color-coded thermostat cable for proper wiring.

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T8501D DELUXE ZONE THERMOSTAT

OUTDOOR

TEMPERATURE

SENSOR

OGB CWRYOTOT

CHANGEOVER CONTROL

Fig. 3. Typical wiring diagram for T8501D with zone 1

OBGYRWCOTOT

W2 L G Y R W M6 M4 M1

TotalZone® PANEL THERMOSTAT CONNECTIONS

Fig. 4. Typical wiring diagram for T8501D with zone 1

THERMOSTAT

MABS II control panel.

THERMOSTAT

TotalZone® control panel.

FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM).

(OPTIONAL)

ZONE 1

OUTDOOR

THERMOSTAT

SENSOR

(OPTIONAL)

FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM).

M4826

M12187

M12186

Fig. 5. Proper wiring technique.

Mounting Thermostat

1. Engage tabs at the top of the thermostat and

wallplate. See Fig. 6.

2. Press lower edge of case to close and latch.

NOTE: To remove the thermostat from the wall, first pull out

at the bottom of the thermostat; remove top last.

ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

PRESS LOWER EDGE OF CASE TO LATCH.

M6798A

Fig. 6. Mounting thermostat on wallplate.

Using Thermostat Keys

The thermostat keys are used to:

• set temperature,

•display present setting,

• configure Installer Setup,

• check System-Test,

•display outdoor temperature (select models),

• set the system operation,

• set the fan operation.

See Fig. 7 for the location of the keys.

INCREASE TEMPERATURE SETTING

DECREASE TEMPERATURE SETTING

DISPLAY PRESENT SETTINGS AND SCROLL THROUGH INSTALLER SETUP MODES (INFORMATION KEY)

M6801

Fig. 7. Key locations and descriptions.

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T8501D DELUXE ZONE THERMOSTAT

SETTINGS

System and Fan Settings

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.

The system default setting is Heat and the fan default setting is Auto. Use the keyboard to change to the desired settings. See Fig. 8.

Fan

System

Press to select

heating or cooling

equipment.

equipment. Em. Ht.

-Emergency heating

On— Fan runs continuously

Heat—Heating equipment

Auto—Fan runs when Off — No equipment Cool—Cooling equipment Auto—Thermostat

automatically selects heating and cooling equipment.

CHECK LIGHT ON SELECT MODELS

heating or cooling equipment operates

System

Fan

Fig. 8. Thermostat System and Fan key location.

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

The default setpoint for heat is 70°F (21°C) and for cool is 78°F (25.5°C). Press the increase ▲ or decrease ▼ key to change the present setting to change between heat and cool, press the Information i key until the setting to be changed appears. Press the increase ▲ or decrease ▼ key to adjust the setting.

System

Fan

M10147

The Installer Setup is used to customize the thermostat to specific systems. Some of the options include temperature display, changeover and outdoor temperature display. Installer Setup numbers are listed in Table 2. The table includes all the configuration options and the factory settings for the T8501.

A combination of key presses are required to use the Installer Setup feature. — To 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. 9 and 10.

— To advance to the next Installer Setup, press the

Information i key.

— To change a setting, use the increase ▲ and de-

crease ▼ keys.

— To exit the Installer Setup, press and hold the

Information i key until the display returns to normal (approximately three seconds). The display will scroll the numbers backwards to get to the normal display. The Installer Setup is automatically exited if no key presses are made for ten minutes.

Em Ht Temporary Setting Aux Ht

Remote

Room

%Humid

Repl

Wait

Batt

System Fan

Heat Cool

Em HeatOffCool Auto Only

Fig. 9. Display of all the segments of the LCD.

INSTALLER SETUP MODE NUMBER DISPLAY (COLUMN 2 OF TABLE 2)

Outdoor

OnAuto

M4844

FACTORY SETTING OR OTHER CHOICE DISPLAY (COLUMN 3 OR 5 OF TABLE 2)

INSTALLER SETUP

NOTE: For most applications, the thermostat factory-

settings will not need to be changed. Review the factory settings in Table 2 and if no changes are necessary, go to the Installer System-Test section.

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M10105A

Fig. 10. Display of Installer Setup number and setting.

IMPORTANT

Only configurable numbers are shown on the device. Example: If thermostat does not have outdoor temperature capability, Installer Setup Number 24 will not be displayed. Review Table 2 factory-settings and mark any desired changes in the Actual Settings column. When Installer Setup is complete, review the settings to confirm that they match the system.

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T8501D DELUXE ZONE THERMOSTAT

Table 2. Thermostat Installer Setup Options.

Installer Setup

Number

(Press i key Factory Setting

Select

Not used 01 — — — — — Fan operation

to change)

Display Description Display Description

02 00 Conventional applica-

tions where equipment controls fan operation in heat mode

01 Heat pump and electric heat

Not used 03 — — — — — Heating cycle

rate

04 06 6 cph used for

conventional systems

01, 03,

or 09

Not used 05 thru 11 — — — — — Changeover 12 01 Manual changeover 00 or0200—Manual changeover

Not used 13 — — — — — Degree

temperature display

14 00 Temperature is

displayed in °F

01 Temperature is displayed in °C

Not used 15 thru 18 — — — — — Extended fan

operation in

a,b

heating Extended fan

operation in

a,b

cooling

19 00 No extended fan

20 00 No extended fan

operation after the call for heat ends

operation after the call for cool ends

01 Fan operation is extended

Not used 21 thru 23 — — — — — Outdoor

temperature

display

24 00 No outdoor

temperature is displayed

01 Outdoor temperature is

Not used 25 thru 32 — — — — — Minimum off

time for the compressor

Heating setpoint range stop

Cooling setpoint range stop

System on indicator (flame=heat, snowflake=cool) is displayed

Temperature display adjustment

a b

Number 02 must be set to 01 to extend fan operation. Available on select models.

33 05 5 minute minimum off

34 90 Heating setpoint can

35 48 Cooling setpoint can

36 00 LCD On symbol is

37 00 No difference in

time for the compressor

be set no higher than 90°F

be set no lower than 48°F

displayed when system is energized

displayed temperature and actual room temperature

00, 01, 02, 03

or 04

40 thru90Number can be set anywhere

48 thru99Number can be set anywhere

01 Display is disabled

-3 thru0301—Display adjusts to 1°F higher

Other Choices

(Press ▲ or ▼ key to change) Actual

Setting

applications where thermostat controls fan operation in heat mode

01—1 cph used for radiant floor heat, gravity systems 03—3 cph used for hot water systems or high efficiency furnaces 09—9 cph used for electric heat systems

02—Auto only

90 seconds after the call for heat ends

90 seconds after the call for cool ends

displayed. Needs a C7089B1000 Outdoor Sensor to operate.

Minimum number of minutes (0 thru 5) the compressor will be off between calls for the compressor

between 40 and 90 in 1°F increments

between 48 and 99 in 1°F increments

than actual room temperature 02—Display adjusts to 2°F higher than actual room temperature 03—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 actual room temperature

-3—Display adjusts to 3°F lower than actual room temperature

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T8501D DELUXE ZONE THERMOSTAT

IMPORTANT

Review the settings to confirm that they match the system. To exit the Installer Setup, press and hold the Information returns to normal (approximately three seconds).

key until the display

INSTALLER SYSTEM-TEST

Use the Installer System-Test to check the thermostat operation. Refer to Table 3 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 two zeros appear. All segments of the LCD will be displayed before the two zeros appear. See Fig. 11 and 12.

Table 3. Tests Available In The Installer System-Test.

Test

Number Self-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 60-69 Keyboard keys test 70-79 Thermostat information including date

code and software versions are displayed

Em Ht Temporary Setting

Aux Ht

Remote

Room

%Humid

Repl

Wait

Batt

System Fan

Heat Cool

Em HeatOffCool Auto Only

Fig. 11. Display of all the segments of the LCD.

TEST MODE NUMBER

Fig. 12. Display of test number.

Refer to Table 4 for the directions and results of the specific tests.

NOTE: Press and hold the increase ▲ and decrease ▼

keys together for three seconds to exit the system-test. The system-test will time out after ten minutes without any key presses.

Outdoor

OnAuto

M4844

M6792

Table 4. Installer System-Test Options.

Key to

Press

Heating Equipment System-Test

i 10 Enter heating equipment system-test.

▲ 11 Heat comes on. When Installer Setup number 02 is 01, the system fan is also energized. ▼ 10 Heat and system fan turn off.

Cooling Equipment System-Test

i 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

i 40 Change from cooling to fan equipment system-test.

▲ 41 Fan comes on. ▼ 40 Fan turns off.

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Test

Number Description

(Continued)

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T8501D DELUXE ZONE THERMOSTAT

Key to

Press

Table 4. Installer Self-Test Options

Test

Number Description

(Continued)

Key Operation System-Test

IMPORTANT

Test numbers will only be displayed when the system is configured for the selected function. EXAMPLE: Numbers 60, 61 and 62 are the only numbers that will be displayed when a system is configured for heat only.

System Key System-Test

i 60 Change from cooling or fan to key operation system-test.

System 61 Heat Test Number is displayed. System 62 Off Test Number is displayed. System 63 Cool Test Number is displayed. System 64 Auto Test Number is displayed.

Fan Key System-Test

Fan 68 Fan on Test Number is displayed. Fan 69 Fan off Test Number is displayed.

NOTE: Press and hold the increase ▲ and decrease ▼ keys together for three seconds to exit the system-test. The

system-test will time out after ten minutes without any key presses.

THERMOSTAT INFORMATION

1. Press the Information i key to access the thermo-

stat information.

3. Press the increase ▲ key again to display the

software identification code.

M4864

2. Press the increase ▲ key to display the production

date code. The first two large digits are the month and the third digit is the last digit of the year (Example: 027=February 1997).

M10444

4. Press the increase ▲ key again to display the

software revision number (Example: 001=Revision number 1).

M4866

M6791

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T8501D DELUXE ZONE THERMOSTAT

5. Press the increase ▲ key again to display the

EEPROM identification code.

CHECKOUT

Outdoor Temperature Sensor (Where Applicable)

Allow the outdoor temperature sensor to soak in the outdoor air for a minimum of five minutes before taking a reading. With an accurate thermometer (±1°F [±0.5°C]), measure the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. Match the thermometer reading to the outdoor temperature display at the thermostat.

6. Press and hold the increase ▲ and decrease ▼

keys together, until the room temperature is displayed, to exit the system-test. The system-test times out after ten minutes without any key presses.

M4867

TROUBLESHOOTING GUIDE

Symptom Possible Cause Action

Display will not come on.

Temperature display is incorrect.

Temperature settings will not change. (Example: Cannot set the heating higher or the cooling lower.)

Available on select models.

Thermostat is not being powered.

Thermostat microprocessor is locked up.

Room temperature display has been reconfigured.

Thermostat is configured for °F or °C display.

Bad thermostat location. Relocate the thermostat. The upper or lower

temperature limits were reached.

The setpoint temperature range stops were configured.

• Check that C terminal is connected to the system transformer.

• Check for 24 Vac between C and R 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 loose connections.

— If 24 Vac is present, proceed with troubleshooting.

Remove the thermostat from the wallplate for 2 minutes. After 2 minutes, replace the thermostat on the wallplate.

Enter Installer Setup number 37 and reconfigure the display.

Enter Installer Setup number 14 and reconfigure the display.

Check the temperature setpoints:

• Heating limits are 40 to 90°F (4.5 to 32°C)

• Cooling limits are 48 to 99°F (7 to 35°C).

Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops.

(Continued)

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T8501D DELUXE ZONE THERMOSTAT

Troubleshooting Guide

(Continued).

Symptom Possible Cause Action

Heating will not come on.

Cooling will not come on.

System on indicator (flame=heat, snowflake=cool) is displayed, but no warm or cool air is coming from the registers.

System on indicator is not displayed, but heating or cooling system is operating

Outdoor temperature not displayed

Outdoor temperature display is incorrect

Available on select models.

No power to the thermostat. • Check that C terminal is connected to the system transformer.

Thermostat minimum off time is activated.

System selection is not set to Heat.

No power to the thermostat. • Check that C terminal is connected to the system transformer.

Thermostat minimum off time is activated.

System selection is not set to Cool.

Fan operation set for 00 (conventional heat) when it should be set for 01 (electric heat).

Conventional heating equipment turns on the fan when the furnace has warmed up to a setpoint.

Heating equipment is not operating.

•Check for 24 Vac between C and R and 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 system switch at the equipment is in the

Off position—set to 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.

Wait up to five minutes for the system to respond.

Set system selection to Heat.

•Check for 24 Vac between C and R and between R and Y 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 system switch at the 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.

•Wait up to five minutes for the system to respond.

•Enter Installer Setup number 33. Reconfigure minimum off time (if required).

Set system selection to Cool.

Enter Installer Setup number 02 and reconfigure the fan operation.

Wait a minute after seeing the On indicator and then check the registers.

Verify operation of heating equipment in self-test.

Option not activated. Enter Installer Setup number 36 and reconfigure to 00.

Option not activated. Enter Installer Setup number 24 and set to 01. Thermostat must

Outdoor sensor is connected incorrectly.

Wrong sensor. Replace sensor with C7089B1000 sensor.

have OT terminals and a C7089B1000 installed.

Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor.

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Honeywell Trol-A-Temp

Helping You Control Your World

57 Bushes Lane Elmwood Park, NJ 07407-3204 (201) 794-8004 (800) 828-8367 Fax: (201) 794-1359

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