Honeywell T8095A Thermostat User Manual

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T8095A/191108AJ/Q682B

Heating, Cooling and Heating/Cooling

Thermostat, Wallplate, and Subbase;

TS8095A/191108AC Heating-Only

Thermostat and Wallplate

Installation Instructions for the Trained Service Technician.

NOTE: Order Q682B Subbase separately.

Preparation

Check thermostat and subbase (if used) suitability for the

heating, cooling, or heating/cooling system. Refer to Table 1.

Assemble tools required: flat bladed screwdriver, hand or

power drill with 3/16-in. drill bit, wire cutter/stripper or

sharp knife, bubble level or plumb bob and line.

Assure power is off to the heating, cooling, or heating/

cooling system at the main fuse panel. Most buildings have

a separate switch box or circuit breaker for disconnecting

power to the heating and cooling (if applicable) equipment.

This thermostat is compatible with most heating, cooling

or heating/cooling systems. Refer to Table 1 for thermostat

and system compatibility information.

M3375

Recycling Notice

This control contains mercury in a sealed tube. Do not

place control in the trash at the end of its useful life.

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 in-

structions regarding recycling and the proper disposal of this

control, or of an old control containing mercury in a sealed

tube.

If you have questions, call Honeywell Inc. at 1-800-

68-1502.

TABLE 1—SYSTEM COMPATIBILITY.

Type of Heating System

to be Controlled

Conditions/Compatibility

Electric (Line Voltage)—

typical baseboard and radiant

• The R8239D1015 Isolating Relay or R841 Silent Switching Center must be

installed in the thermostat control circuit.

Fan Coil Unit

• Compatible. Assure correct subbase identity is selected for fan control.

Gas—Direct Spark Ignition

• Compatible. If not using battery backup, assure that 24V control transformer

DSI), Intermittent Pilot (IP), common is accessible for connection to thermostat cable conductor and power to

the transformer is not regularly interrupted by high temperature or limit operation.

(

and Standing Pilot (SP)

Heat Pump

• Compatible. Assure correct subbase identity is selected for fan control and

changeover control (O terminal for cool and B terminal for heat).

Hot Water Zone

• Honeywell 2-wire valves are compatible.

•

Some non-Honeywell 2-wire valves require an R8239D1015 Isolating Relay in

the thermostat control circuit.

•

Some 3-wire valves require an R8239A1052 Isolating Relay in the thermostat

control circuit.

a, b

Oil

• If not using battery backup, assure that the 24V control transformer common is

accessible for connection to thermostat cable conductor and power to transformer

is not regularly interrupted by high temperature, purge cycle, or limit operation.

Vent Damper

Warm Air Zone

• Honeywell damper motors are compatible.

•

Some non-Honeywell damper motors require an R8239D1015 Isolating Relay in

the thermostat control circuit. Check control amperage requirement.

• Most are compatible.

If thermostat is not compatible with the system being controlled, the system will not operate. No hazard exists. The thermo-

stat will not be damaged unless it is used to directly control a line voltage system. For proper system operation, a Honeywell

R841 or R8239D1015 Isolating Relay must be added to the thermostat control circuit.

Consult manufacturer for installation requirements.

D.F. • Rev. 11-94 •1 M3375 • ©Honeywell Inc. 1994 • Form Number6 69 9- -00 66 33 88 —— 11

Installation

Fig. 1—Unpack thermostat.

WHEN INSTALLING THIS PRODUCT…

. Read these instructions carefully. Failure to follow

them could cause a hazardous condition.

. Installer must be a trained experienced service technician.

. After installation is complete, check out product op-

THERMOSTAT

COVER

60 70

eration as provided in these instructions.

LIFT

COVER

IMPORTANT: An incorrectly leveled subbase will cause

the temperature control to deviate from setpoint. It is

not a calibration problem.

CAPTIVE

MOUNTING

SCREWS

THERMOSTAT

BASE

M1518

CAUTION

. Disconnect power supply to prevent electrical

shock or equipment damage.

. To prevent interference with the thermostat

linkage, keep wire length to a minimum and run

wires as close as possible to the subbase.

. Do not overtighten thermostat captive mount-

ing screws because damage to subbase threads

can result.

Pullwiresthroughthelargewiringholeinthewallplateor

subbase.

Loosely fasten the wallplate or subbase to the wall with

the three screws. Do not completely tighten the screws.

Carefully level the wallplate or subbase (Fig. 3), and

firmly tighten the screws.

. Do not short across coil terminals on relay. This

can burn out the thermostat heat anticipator.

Fig. 2—Mounting wallplate or subbase to wall.

LOCATION

Locate thermostat about 5 ft [1.5m] above the floor in an

area with good air circulation at average temperature.

Do not mount the thermostat where it may be affected by:

SCREW HOLES

—

drafts, or dead spots behind doors and in corners.

hot or cold air from ducts.

radiant heat from the sun or appliances.

concealed pipes and chimneys.

unheated (uncooled) areas such as an outside wall

behind the thermostat.

WITH PLASTIC

ANCHORS

Run wires from the heating, cooling or heating/cooling

equipment to the new thermostat location.

Refer to the Typical Wiring Diagrams section to deter-

mine the number of wires required for your application.

FAN

OFF COOL

AUTO

HEAT

UNPACK THERMOSTAT

HEATING/COOLING SUBBASE

Handle your new thermostat carefully; rough handling

may interfere with its accuracy. Before unpacking, refer to

Fig. 1.

M1552A

Remove and discard the shipping wrap.

SCREW HOLES

IMPORTANT: Save package of screws and instructions

WITH PLASTIC

ANCHORS

for the homeowner.

Remove the thermostat cover by lifting from the bottom.

Set aside cover until needed later.

WALLPLATE

Carefully remove the material protecting the mercury

switch bulb.

Loosen two captive mounting screws and separate wall-

plate (if provided) from the back of the thermostat base.

MOUNT WALLPLATE OR SUBBASE

Wall Mounting (Fig. 2)

Hold wallplate or subbase in position on the wall (Fig. 2).

Mark holes on the wall for anchors. Use spirit level to

make sure the wallplate or subbase is level.

Drill 3/16-in. holes, and gently tap anchors into holes

until flush with the wall.

M1815

9-0638—1

WIRE WALLPLATE OR SUBBASE

Fig. 3—Leveling methods for wallplate or

subbase.

Follow the instructions provided by the heating, cooling,

or heating/cooling equipment manufacturer. If not avail-

able, refer to the Typical Wiring Diagrams section at the end

of this publication.

Disconnect the power supply before making wiring con-

nections to prevent electrical shock or equipment damage.

SPIRIT LEVEL

NOTE: All wiring must comply with local electrical codes

and ordinances.

PLUMB

LINE

This thermostat clock can be powered by a 24-Vac trans-

former with battery backup. Refer to Figs. 15 and 16 for

hookup diagrams of typical powering applications.

Wallplate (Heating or Cooling Systems)

Refer to Fig. 5 and strip the thermostat wire insulation as

necessary.

PLUMB

BOB OR

WEIGHT

FAN

COOL

AUTO

HEAT

OFF

M1555

For heating-only systems, connect wires to R, W, and C

if applicable) terminals. See Fig. 17. For cooling-only sys-

(

tems, connect wires R, Y, and C (if applicable) terminals.

Firmly tighten the screws.

Outlet Box Mounting (Fig. 4)

Use a horizontally mounted outlet box if possible. If a

vertical outlet box is used, mount the wallplate or subbase on

a 193121A Cover Plate Assembly (ordered separately). Fol-

low the instructions provided with the cover plate assembly.

Align the wallplate or subbase mounting holes on the

outlet box and loosely fasten with two screws.

Push excess wire back into the wall.

Plug the hole in the wall with nonhardening caulk, putty,

or nonflammable insulation to prevent drafts from affecting

thermostat operation.

Subbase (Heating/Cooling Systems)

Refer to Fig. 5 and strip the thermostat wire insulation as

necessary.

Carefully level the wallplate or subbase (Fig. 3), and

firmly tighten the screws.

Fig. 4—Mounting wallplate or subbase on horizontal outlet box.

EXISTING

HORIZONTAL

OUTLET BOX

HORIZONTAL

OUTLET BOX

HEATING/

COOLING

SUBBASE

WALLPLATE

FAN

OFF COOL

AUTO

HEAT

M1816

M1553A

VERTICAL

OUTLET

BOX

COVER

PLATE

ADAPTER

RING

SUBBASE OR

WALLPLATE

MOUNTING

SCREWS (2)

NOT INCLUDED WITH UNIT.

M1554A

ACCESSORY PARTS AVAILABLE.

69-0638—1

Connect the wires to the corresponding terminals on the

subbase(orderedseparately). Iflabelsdonotagreewithyour

newsubbase, refertoTable2andtheinstallationinstructions

furnished with the subbase.

Hang the thermostat base on the wallplate or subbase.

Insert the two captive mounting screws located in the bot-

tom corners of the base (Fig. 6).

Firmly tighten the screws.

NOTE: If wiring a dual transformer system, only the O or

the B terminal may be used.

INSERT CLOCK BATTERIES

Power is supplied to the clock by the 24-Vac transformer.

Backup batteries (not included) may be installed to supply

power to the clock if power is interrupted.

Push excess wire back into the wall.

Plug the hole in wall with nonhardening caulk, putty, or

nonflammable insulation to prevent drafts from affecting

thermostat operation.

Install the batteries in the thermostat (Fig. 7).

Once a year or when batteries are dead, replace with two

new AAA alkaline batteries. Properly dispose of old batter-

ies. We recommend Energizer^®batteries.

Fig. 5—Methods of connecting terminals.

Fig. 6—Thermostat mounting.

FOR STRAIGHT

CONNECTION—

STRIP 5/16 in. [8 mm]

FOR WRAPAROUND

CONNECTION—

STRIP 7/16 in. [11 mm]

BARRIER

TAB (2)

MOUNTING SLOT (2)

M1556B

TABLE 2—TERMINAL DESIGNATIONS.

Subbase

Terminal

Control

Function

Control transformer power.

Line side of 24V power supply;

cooling side, 2 transformer heat-cool

system.

Line side of 24V power supply;

heating side, 2 transformer heat-cool

system.

THERMOSTAT

BASE

WALLPLATE

OR SUBBASE

CAPTIVE

MOUNTING SCREWS

M8584

Heating control circuit.

Fig. 7—Insert clock batteries.

Cooling control circuit; jumper to W

for heat pump compressor control if

no P terminal on subbase.

BATTERY LOCATION FOR

(2) AAA BATTERIES;

INSTALL WITH POSITIVE

ENDS UP

Fan control circuit.

Clock control (transformer common).

Cooling damper or changeover/

reversing valve, makes continuously

in cool.

Heating damper or changeover/

reversing valve, makes continuously

in heat.

Heat pump contactor; P terminal on

some models only.

M7188

MOUNT THE THERMOSTAT

Note the tabs on the top inside edge of the thermostat

base. These tabs fit the slots molded into the top of the wall-

plate or subbase.

9-0638—1

SET HEAT ANTICIPATOR

Fig. 8—Set clock.

Adjust the heat anticipator lever to match the current

ratingoftheprimarycontrolforthepropercyclerate(Fig. 9).

Adjustable anticipation must be set for total current of

heat and fan control.

PROGRAM DIAL

The current rating is usually stamped on the control or

valve (Fig. 10), or a setting may be given in the device

instructions.

MINUTE

HAND

If no current rating or heat anticipator setting is given,

measure the current with an ammeter. Proceed with the fol-

lowing steps.

Remove the thermostat from the wallplate or subbase.

Connect an ac ammeter of appropriate range (about 0A to

A) between the R and W terminals on the wallplate or sub-

TIME

INDICATOR

ARROW

base except for electric heat and heat pump systems.

Let the system operate for one minute.

Adjust the heat anticipator lever to match the number that

reads on the ammeter.

M1813A

ATTACH THERMOSTAT COVER

Make sure the packing inserts in the thermostat base are

removed.

Place the two tabs on the upper edge of the cover into the

mounting slots in the thermostat base (Fig. 11).

Swing the cover downward until it catches at the bottom

of the base.

SET CLOCK

Adjust the clock by moving the minute hand in a clock-

wise

direction. Do not reverse the minute hand.

When time is correctly set, the time indicator arrow (tri-

angle shape) points to the correct time and the corresponding

daytime(light)ornighttime(dark)portionoftheprogramdial.

Fig. 11—Attach cover.

Fig. 9—Adjust heat anticipator.

50 60

ANTICIPATOR

SCALEPLATE

M1519

ANTICIPATOR

SETTING LEVER

M7317

Fig. 10—Current rating of primary control.

OIL BURNER CONTROL

SHOWS

CURRENT

DRAW

SHOWS

VOLTAGE

RATING

SHOWS LOW

VOLTAGE

30 VAC

V8043E 1004 4

0.2 AMP

4V 50/60CY

SHOWS

ANTICIPATOR

SETTING

.32 AMP @ 60CY

SHOWS

VOLTAGE

RATING

BURNER

24 Vac 50/60 Hz

0.4 AMP

FROM MAIN

SHOWS

FUEL SUPPLY

ANTICIPATOR

SETTING

ZONE VALVE

M6116A

TYPICAL GAS VALVE

69-0638—1

SET TEMPERATURE CONTROL LEVERS

The two levers on top of the thermostat control the low

and high temperatures for energy savings and comfort con-

trol (Fig. 12). The lever on the left (blue mark) controls the

lower temperature. The lever on the right (red mark) controls

the higher temperature.

Operate the entire heating system at least one complete

cycle.

If thermostat fails any test, refer to the Troubleshooting

Guide in the Owner’s Manual.

Reset both the temperature setting levers to the desired

temperatures.

We recommend pushing the levers together at an appro-

priate temperature for either heat or cool until the occupant

programs the thermostat and makes the final temperature

selections.

COOLING-ONLY SYSTEM (T8095A ONLY)

Turn on power to the cooling equipment.

Push both temperature setting levers together at least 5° F

[

3° C] below the room temperature. The cooling equipment

will operate, and the fan will start. Allow for any time delay

that may be built into the compressor control circuit.

Fig. 12—Temperature control levers.

LOW TEMPERATURE

BLUE MARK)

SET LEVER

HIGH TEMPERATURE

(RED MARK)

SET LEVER

NOTE: To avoid compressor damage, do not operate the

system when outdoor temperature is below 50°F [10°C].

Refer to manufacturer recommendations.

(

Move both levers 5° F [3° C] above room temperature.

The cooling equipment and the fan should shut off.

Operate the entire cooling system at least one complete

cycle.

60 70

If thermostat fails any test, refer to the Troubleshooting

Guide in the Owner’s Manual.

M859

Reset both the temperature setting levers to the desired

temperatures.

SET SUBBASE SWITCHES (IF APPLICABLE)

The subbase system switch controls system operation as

follows:

HEAT: Heating system is controlled by the thermostat.

Cooling system is off.

HEATING/COOLING SYSTEM

Turn on power to the furnace and cooling system.

Place the system switch lever to HEAT and fan switch

lever to AUTO.

COOL: Cooling system is controlled by the thermostat.

Heating system is off.

OFF: Both the heating and cooling systems are off. If the

fan switch is in the AUTO position, the fan is also off.

The subbase fan switch controls fan operation as follows:

ON: Fan operates continuously.

AUTO: Fan operates with the cooling equipment as con-

trolled by the thermostat or with the heating equip-

ment as controlled by the plenum switch. In electric

heat, heat pump and fan coil systems, the fan is con-

trolled by the thermostat in heating and cooling.

To switch positions, use thumb or index finger to slide

lever to the desired position. For proper circuit operation,

switch lever must stop in detent over the desired function

indicator mark.

Push both temperature setting levers together at least 5° F

[3° C] above room temperature. The main burner should

come on. The fan will start when the furnace heats up. (If

central electric heat, fan coil or heat pump system, fan starts

immediately.)

Move both levers 5° F [3° C] below room temperature.

The burner should shut off.

PlacethesystemswitchlevertoCOOLandthefanswitch

lever to AUTO. The cooling equipment will operate, and the

fan will start. Allow for any time delay that may be built into

the compressor control circuit.

NOTE: To avoid compressor damage, do not operate the

system when outdoor temperature is below 50°F [10°C].

Refer to manufacturer recommendations.

Move both temperature setting levers together at least 5° F

3° C] above the room temperature. The cooling equipment

should shut off.

[

Checkout

Place the fan switch to ON. The fan should run continu-

ously with the system switch in any position.

Place the system switch to OFF. Move both temperature

setting levers to various positions. The heating and cooling

systems should not operate.

Operate the entire system for at least one complete cycle

with the system switch at COOL and one complete cycle

with the switch at HEAT.

If thermostat fails any test, refer to the Troubleshooting

Guide in the Owner’s Manual.

Reset both the temperature setting levers to the desired

temperatures.

Leave Owner’s Manual and Assistance Information in a

convenient place for the building occupant or provide with

other appliance manuals.

CAUTION

Do not check operation by shorting across termi-

nals of system controls. This will damage the heat

anticipator.

HEATING-ONLY SYSTEM

Turn on power to the furnace.

Push both temperature setting levers together at least 5° F

3° C] above the room temperature. The main burner should

come on. The fan will start when the furnace heats up.

Move both levers 5° F [3° C] below the room tempera-

ture. The burner should shut off.

[

9-0638—1

To check thermostat calibration, allow several hours of

operation after installation. Then read thermometer and re-

move cover. Push temperature levers together to a setting

below room temperature. Slowly move them up the scale

together until the mercury slides across the tube. If the

thermometer reading and the high temperature lever posi-

tion are approximately the same at the instant the mercury

moves to the other end, no recalibration is needed.

Calibration

NOTE: Select models can be calibrated.

THERMOMETER

The thermometer in your thermostat was accurately cali-

brated at the factory. The thermometer should need adjust-

ment only if it has been dropped or shifted due to mishandling.

If the setpoint lever and the thermometer reading do not

agree:

. Remove the thermostat cover by pulling up from the

bottom of cover until it clears the mounting slots.

. Set the thermostat cover on a table near an accurate

thermometer.

If calibration is necessary, proceed as follows:

. Remove the cover.

2. Place open-end calibration wrench, part no. 104994A

(

ordered separately), on the hex nut under the bimetallic coil

controlled by the red lever (Fig. 14). Hold lever so it does not

move, and gently turn the wrench clockwise

until the

mercury rests securely in the right end of the tube.

. Allow five minutes for cover thermometer to sense

area temperature; compare the readings. Be careful not to

. Put the thermostat cover on and wait 10 minutes.

4. Read the thermometer. Then remove the cover. Mov-

touch thermometer or breathe on it.

ing both levers, place the HIGH lever at the thermometer

reading. Hold lever so it does not move, and gently turn the

. If the readings are the same, replace cover and put the

system into operation.

. If the readings are different, insert a small screwdriver

in the thermometer and turn it until the thermometers have

the same reading (Fig. 13).

wrench counterclockwise

until the mercury just slides

to the left end of the tube but no farther. Try to do this quickly

so the heat from your hands does not affect the thermostat.

5. Repeat this procedure for the blue lever.

. Replace thermostat cover and put the system into

operation.

Fig. 14—Use of 104994A calibration wrench.

NOTE: Radiant heat from your hands will offset the ther-

mometer reading. After making each adjustment, wait 5

or 10 minutes for the thermometer to stabilize before

comparing.

CALIBRATION

WRENCH

Fig. 13—Thermometer calibration.

ANTICIPATOR

SETTING

LEVER

ANTICIPATOR

SCALEPLATE

.10

INCREASE

M8583

Typical Wiring Diagrams

The clock for the T8095 and TS8095 must be powered by

a 24V transformer for the T8095. A separate transformer

may be connected (Fig. 15), or the system transformer may

be connected (Fig. 16).

M5128

THERMOSTAT

This thermostat was calibrated at the factory and should

not need recalibration in the field. If recalibration seems

necessary, first be sure wallplate or subbase is accurately

leveled. Then check thermometer calibration.

69-0638—1

Fig. 15—Typical hookup for clock powered by

separate 24-Vac transformer.

Fig. 16—Typical hookup for clock powered by

system transformer. Clock powered by battery

when system is not powered (e.g., power to

system is off or interrupted).

CLOCK

BATTERY

THERMOSTAT

CLOCK

BATTERY

THERMOSTAT

SUBBASE

HOT)

(

SUBBASE

HEAT

RELAY

HOT)

(

HOT)

HEAT

RELAY

(

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

M1513A

BATTERY BACKUP MAY BE USED IF POWER TO

CLOCK IS INTERRUPTED.

M1512B

Fig. 17—Internal schematic and typical hookup for TS8095A Thermostat/191108AC Wallplate in heating-

only system.

CLOCK

FALL

THERMOSTAT

BIMETAL FIXED

ANTICIPATOR

BIMETAL FIXED

ANTICIPATOR

WALLPLATE

50 mV

HOT)

SYSTEM

(

M1808A

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

Automation and Control Solutions

Honeywell International Inc.

Honeywell Limited—Honeywell Limitée

35 Dynamic Drive

985 Douglas Drive North

Golden Valley, MN 55422

Scarborough, Ontario M1V 4Z9

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