Honeywell T8501A Bedienungsanleitung

X-XX UL

INSTALLATION INSTRUCTIONS

T8501A,B,C,D

Microelectronic Thermostats

APPLICATION

The T8501 Microelectronic Thermostat provides electronic control of 24 Vac single-stage heating and cooling systems.

Refer to Table 1 for a general description of the thermostat. All T8501 Thermostats require a common wire to supply

power.

Table 1. Description of T8501 Thermostats.

RECYCLING NOTICE

If this control is replacing a control that contains

mercury in a sealed tube, do

not

place your old

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.

T8501 System Changeover System

Selection Fan

Selection Comments

AHeat only None None None —

BHeat only None Heat-Off On-Auto Select models have only a system switch or fan

switch and some models have both.

CHeat-Cool Manual Heat-Off-Cool On-Auto System and fan selections are done by

switches.

DHeat-Cool Automatic Heat-Off-Cool-Auto On-Auto System and fan selections are done by

keyboard.

CAUTION

Disconnect power supply to prevent electrical

shock or equipment damage.

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. wiring box. Position wallplate horizontally

on the wall or on a 2 in. x 4 in. wiring box.

쐃Position and level the wallplate (for appearance

only). The thermostat will function properly even

when not level.

69-0959

69-0959 2

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Fig. 1. Typical location of thermostat.

Fig. 2. Mounting the wallplate.

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

쐋Remove 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 or wood, drill two

7/32 inch holes. Gently tap anchors (provided) into

the drilled holes until flush with the wall.

쐏Position the wallplate over the holes, pulling wires

through the wiring opening.

쐄Loosely insert the mounting screws into the holes.

쐂Tighten mounting screws.

WIRING

All wiring must comply with local electrical codes and

ordinances. Refer to Fig. 3 through 5 for typical hookups.

A letter code is located near each terminal for identifica-

tion.

CAUTION

Disconnect power before wiring to prevent

electrical shock or equipment damage.

쐃Loosen the terminal screws on the wallplate and

connect the system wires. See Fig. 6.

IMPORTANT

Use 18 gauge, color-coded thermostat cable for

proper wiring.

쐇Securely tighten each terminal screw.

쐋Push excess wire back into the hole.

쐏Plug the hole with nonflammable insulation to

prevent drafts from affecting the thermostat.

WIRES

THROUGH WALL

WALL

MOUNTING

HOLES

MOUNTING

SCREWS

M6530

WALL

ANCHORS

(2)

5 FEET

[1.5 METERS]

YES

M10106

69-0959

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Fig. 3. Typical hookup in heat only application.

Fig. 4. Typical hookup in heat and cool

system with one transformer.

Mounting Thermostat

쐃Engage tabs at the top of the thermostat and

wallplate. See Fig. 7.

쐇Press lower edge of case to close and latch.

Fig. 5. Typical hookup in heat and cool

system with two transformers.

Fig. 6. Proper wiring technique.

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

HEATING

RELAY OR

VALVE COIL

M4821

COMPRESSOR

CONTACTOR

FAN

RELAY

CBOGYW

OUTDOOR

TEMPERATURE

SENSOR

COOL

CHANGEOVER

VALVE OR

DAMPER

HEAT

CHANGEOVER

VALVE OR

DAMPER

THERMOSTAT

M4826

FOR WRAPAROUND

INSERTION STRIP

7/16 IN. (11 MM).

FOR STRAIGHT

INSERTION STRIP

5/16 IN. (8 MM).

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

JUMPER Rh TO Rc IN A SINGLE TRANSFORMER SYSTEM.

HEATING

RELAY OR

VALVE COIL

M4820

COMPRESSOR

CONTACTOR

FAN

RELAY

RhO

OGYCBW

OUTDOOR

TEMPERATURE

SENSOR

COOL

CHANGEOVER

VALVE OR

DAMPER

HEAT

CHANGEOVER

VALVE OR

DAMPER

THERMOSTAT

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

AVAILABLE ON SELECT MODELS.

HEATING

RELAY OR

VALVE COIL

M4822

OUTDOOR

TEMPERATURE

SENSOR

THERMOSTAT

69-0959 4

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Fig. 7. Mounting thermostat on wallplate.

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

at the bottom of the thermostat; remove top last.

Using Thermostat Keys

The thermostat keys are used to:

•set temperature,

•display present setting,

•configure Installer Setup,

•check Self-Test,

•display outdoor temperature (select models).

Select models have keys to:

•set the system operation,

•set the fan operation.

See Fig. 8 for key information.

Fig. 8. Thermostat key locations and descriptions.

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: Equipment controls fan.

The system default setting is Heat and the fan default

setting is Auto. Use the keyboard or system and fan

switches, depending on model, to change to the desired

settings. See Figs. 9 and 10.

Fig. 9. T8501C system and fan switches location.

Fig. 10. T8501D system and fan keys location.

NOTE: Always press the system and fan 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.

INSTALLER SETUP

NOTE: For most applications, the thermostat factory-

settings do not need to be changed. Review the

factory settings in Table 2 and if no changes are

necessary, go to the Installer Self-Test section.

M6798A

PRESS LOWER EDGE OF CASE TO LATCH.

ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

M10147

Press to select

heating or cooling

equipment.

Em. Ht.

-Emergency heating

Heat—Heating equipment

Off — No equipment

Cool—Cooling equipment

Auto—Thermostat

automatically selects

heating and cooling

equipment.

Press to select

heating or cooling

equipment.

On—Fan runs continuously

Auto—Fan runs when

heating or cooling

equipment operates

System

Fan

1CHECK LIGHT ON SELECT MODELS

M6801

DISPLAY PRESENT

SETTINGS AND SCROLL

THROUGH INSTALLER

SETUP MODES

(INFORMATION KEY)

DECREASE

TEMPERATURE

SETTING

INCREASE

TEMPERATURE

SETTING

M10146

HEAT OFF COOL

ON AUTO

HEAT OFF COOL

ON AUTO

SYSTEM

Selection for heating or cooling

equipment operation.

Heat - Heating equipment

Off - No equipment

Cool - Cooling equipment

FAN

On - Fan runs continuously

Auto - Fan runs when

heating or cooling

equipment operates

69-0959

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Mode Number

(Press i key Factory-Setting Other Choices

(Press ▲or ▼key to change)

Select to change) Display Description Display Description

Not used 01 — — — —

Fan operationa02 00 Conventional applica-

tions where equipment

controls fan operation in

heat mode

01 Heat pump and electric heat

applications where thermostat

controls fan operation in heat

mode

Not used 03 — — — —

Heating cycle rate 04 06 6 cph used for

conventional systems 01, 03,

or 09 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

Not used 05 thru 11 — — — —

Changeover

(T8501D only) 12 01 Automatic changeover 00 Manual changeover

The Installer Setup is used to customize the thermostat to

specific systems. Some of the options include temperature

display, changeover, minimum equipment on time and

minimum off time. Installer modes are listed in numerical

order in Table 2. The table includes all the configuration

options and the factory-settings available for the T8501.

IMPORTANT

The Installer Setup must be set correctly for the

HVAC equipment, thermostat and subbase to

operate properly.

A combination of key presses are required to use the

Installer Setup feature.

—To enter the Installer Setup mode, press and hold the

Information i key with the increase ▲and decrease

▼keys until the first mode number is displayed. All

display segments appear for approximately three

seconds before the mode number is displayed. See

Figs. 11 and 12.

—To advance to the next Installer Setup mode, press

the Information i key.

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

crease ▼key.

—To exit the Installer Setup mode, press and hold the

Information i key until the display returns to normal

(approximately three seconds). The display scrolls the

Mode Numbers backwards to get to the normal

display. The Installer Setup mode is automatically

exited if no key presses are made for five minutes.

NOTE: Only configurable Mode Numbers are shown.

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

Fig. 12. Display of Installer Setup mode and setting.

CAUTION

Heat pump and electric heat systems must be

configured to 01 in Installer Setup mode 02 to

prevent equipment damage caused by the system

running without the fan.

Table 2. Thermostat Installer Setup Options.

aAvailable on select models.

(Continued)

M10105

MODE NUMBER DISPLAY

(COLUMN 2 OF TABLE 2)

FACTORY SETTING OR

OTHER CHOICE DISPLAY

(COLUMN 3 OR 5 OF TABLE 2)

Em HeatOffCool Auto Only

Heat Cool

OnAuto

System Fan

Room

Outdoor

Em Ht Temporary Setting

Wait

%Humid

Aux Ht Remote

Repl

Batt

M4844

69-0959 6

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Table 2. Thermostat Installer Setup Options (continued).

aAvailable on select models.

b Mode 02 must be set to 01 to extend fan operation.

cT8501D is 48°F.

Mode Display

(Press i key Factory-Setting

Other Choices

(Press ▲or ▼key to change)

Select to change) Display Description Display Description

Not used 13 — — — —

Degree tempera-

ture display 14 00 Temperature is

displayed in °F 01 Temperature is displayed in °C

Not used 15 thru 18 — — — —

Extended fan

operation in

heating

a,b

19 00 No extended fan

operation after the call

for heat ends

01 Fan operation is extended

90 seconds after the call for

heat ends

Extended fan

operation in

cooling

20 00 No extended fan

operation after the call

for cool ends

01 Fan operation is extended

90 seconds after the call for

cool ends

Not used 21 thru 23 — — — —

Outdoor

temperature

display

24 00 No outdoor temperature

is displayed 01 Outdoor temperature is displayed.

Needs a C7089B1000 Outdoor

Sensor to operate.

Not used 25 thru 32 — — — —

Minimum off time

for the

compressor

33 05 5 minute minimum off

time for the compressor 00, 01,

02, 03 or

Minimum number of minutes

(0 thru 5) the compressor will be

off between calls for the

compressor

Heating setpoint

range stop

34 90 Heating setpoint can be

set no higher than 90°F 40 thru

90 Number can be set anywhere

between 40 and 90 in 1°F

increments

Cooling setpoint

range stop

35 45

Cooling setpoint can be

set no lower than 45°F

thru

99 Number can be set anywhere

between 45

and 99 in 1°F

increments

System On

display

36 00 LCD On symbol is

displayed when system

is energized

01 Display is disabled, usually set for

01 for a zoned system

Temperature

display

adjustment

37 00 No difference in

displayed temperature

and actual room

temperature

01 thru

01—Display adjusts to 1°F higher

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

04—Display adjusts to 1°F lower

than actual room temperature

05—Display adjusts to 2°F lower

than actual room temperature

06—Display adjusts to 3°F lower

than actual room temperature

69-0959

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Table 4. Installer Self-Test Options.

Table 3. Tests Available In The Installer

Self-Test Mode.

Refer to Table 4 for the directions and results of the

specific tests.

IMPORTANT

Models with system and fan switches must set

the switches to the equipment that is being

checked for the equipment to operate.

NOTE: Press and hold the increase ▲and decrease ▼

keys for three seconds to exit the self-test mode.

The self-test times out after five minutes without

any key presses.

INSTALLER SELF-TEST

Use the Installer Self-Test to check the thermostat

configurations and operation. Refer to Table 3 for a list of

the available self-tests.

To start the self-test:

NOTE: The minimum off time for compressors is

bypassed during the Installer Self-Test.

Press and hold the increase ▲and decrease ▼ keys, at

the same time, until two zeros appear. All segments of the

LCD are displayed before the two zeros appear.

(Continued)

Em HeatOffCool Auto Only

Heat Cool

OnAuto

System Fan

Room

Outdoor

Em Ht Temporary Setting

Wait

%Humid

Aux Ht Remote

Repl

Batt

M4844

M6792

TEST MODE

NUMBER

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 (T8501D only) can be turned

on and off.

60-69 System key or system switch position test

(not available on T8501A)

70-79 Thermostat information including date code

and software versions are displayed

Key to

Press

Test

Mode

Number Description

Heating Equipment Self-Test

i 10 Enter heating equipment self-test. (Set system switch to HEAT on switch models.)

▲11 Heat comes on. When Installer Setup mode number 02 is 01, the system fan is also

energized.

▼10 Heat and system fan turn off.

Cooling Equipment Self-Test

i 30 Change from heating to cooling equipment self-test. (Set system switch to COOL on switch

models.)

▲31 Cool and system fan come on.

▼30 Cool and system fan turn off.

Fan Equipment Self-Test (T8501D only)

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

▲41 Fan comes on.

▼40 Fan turns off.

69-0959 8

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Table 4. Installer Self-Test Options. (Continued)

aAvailable on select models.

쐇Press 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: 026 = February 1996)

쐋Press the increase ▲key again to display the

software identification code.

(Example: 02 = software ID code 2)

Press the increase ▲key again to display the

software revision number.

(Example: 001 = revision number 1)

Thermostat Information

쐃Press the Information i key to access the thermo-

stat information.

M6791

M4864

M4865

M4866

Key to

Press

Test

Mode

Number Description

Key or Switch Operation Self-Test

IMPORTANT

Test Mode 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 OR SWITCH SELF-TEST (When system switch is used, move switch to see Test Mode Numbers.)

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

System 61 Heat Test Mode Number is displayed. (Set system switch to HEAT.)

System 62 Off Test Mode Number is displayed. (Set system switch to OFF.)

System 63 Cool Test Mode Number is displayed. (Set system switch to COOL.)

System 64 Auto Test Mode Number is displayed.

FAN KEY SELF-TEST (Fan switch cannot be tested)

Fan 68 Fan on Test Mode Number is displayed.

Fan 69 Fan off Test Mode Number is displayed.

69-0959

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

Press the increase ▲key again to display the

EEPROM identification code.

(Example: 222 = EEPROM ID 222)

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.

쐂Press and hold the increase ▲and decrease ▼

keys together, until the room temperature is

displayed, to exit the self-test mode. The self-test

times out after five minutes without any key presses.

M4867

TROUBLESHOOTING GUIDE

aAvailable on select models.

(Continued)

Symptom Possible Cause Action

Display will not

come on. Thermostat is not being

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

transformer.

•Check for 24 Vac between C and R or RH 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.

Thermostat microprocessor is

locked up. Remove the thermostat from the wallplate for 2 minutes. After

2 minutes, replace the thermostat on the wallplate.

Temperature

display is incorrect. Room temperature display has

been reconfigured. Enter Installer Setup mode number 37 and reconfigure the

display.

Thermostat is configured for °F

or °C display.

Enter Installer Setup mode number 14 and reconfigure the

display.

Bad thermostat location. Relocate the thermostat.

Temperature

settings will not

change. (Example:

Cannot set the

The upper or lower temperature

limits were reached. Check the temperature setpoints:

•Heating limits are 40 to 90°F (7 to 31°C)

•Cooling limits are 45 to 99°F (9 to 37°C) except T8501D

cooling limits are 48 to 99°F

heating higher or

the cooling lower.) The setpoint temperature range

stops were configured. Check Installer Setup mode numbers 34 and 35 and

reconfigure the setpoint stops.

Heating will not

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

transformer.

•Check for 24 Vac between C and R or RH 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.

69-0959 10

T8501A,B,C,D MICROELECTRONIC THERMOSTATS

TROUBLESHOOTING GUIDE (Continued)

aAvailable on select models.

Symptom Possible Cause Action

Heating will not

come on. Thermostat minimum off time is

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

(Continued) System selection is not set to

Heat. Set system selection to Heat.

Cooling will not

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

transformer.

• Check for 24 Vac between C and R or RC 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.

Thermostat minimum off time is

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

• Enter Installer Setup mode number 33. Reconfigure

minimum off time (if required).

System selection is not set to

Cool. Set system selection to Cool.

System On

indicator is lit, but

no heat is being

delivered.

Fan operation set for 00

(conventional heat) when it

should be set for 01 (electric

heat).

Enter Installer Setup mode number 02 and reconfigure the 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 equipment is not

operating. Verify operation of heating equipment in self-test.

Outdoor

temperature

not displayed

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

Thermostat must have OT terminals and a C7089B1000

installed.

Outdoor

temperature Outdoor sensor is connected

incorrectly. Refer to C7089B1000 installation instructions and check wiring

between the thermostat and sensor.

display is incorrect

Wrong sensor. Replace sensor with C7089B1000 sensor.

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