Honeywell T8090A User Manual

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Page 1

TRADELINE

and Heating-Cooling Thermostat,

T8090A Heating, Cooling,

Wallplate and Subbase

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.

TABLE 1—SYSTEM COMPATIBILITY FOR NON-BATTERY POWERED THERMOSTATS.

Type of Heating System to be Controlled Conditions/Compatibility

Electric (Line Voltage)—Typical baseboard and radiant

Fan Coil Unit • Compatible. Assure correct subbase identity selected for

Gas—Direct Spark Ignition (DSI), Intermittent Pilot (IP), and Standing Pilot (SP)

Heat Pump • Compatible. Assure correct subbase identity is selected

Hot Water Zone • Honeywell 2-wire valves are compatible.

Oil • If not using battery backup, assure that the 24V control

Vent Damper • Honeywell damper motors are compatible.

Warm Air Zone • Most are compatible.

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

Cut the two black heat anticipator jumper wires before installing the thermostat. See Set Heat Anticipator section.

Consult manufacturer for installation requirements.

• The R8239D1015 Isolating Relay or R841 Silent

• Compatible. If not using battery backup, assure that the

• Some non-Honeywell 2-wire valves will require an

• Some 3-wire valves will require an R8239A1052

• Some non-Honeywell damper motors will require an

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 all heating, cooling or heating/cooling systems when thermostat is powered by batteries. If thermostat is not powered by batteries, refer to Table 1 for thermostat and system compatibility information.

Switching Center must be installed in the thermostat control circuit.

fan control.

24V control transformer common is accessible for connection to thermostat cable conductor and power to the transformer is not regularly interrupted by high temperature or limit operation.

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

R8239D1015 Isolating Relay in the thermostat control circuit.

Isolating Relay in the thermostat control circuit.

transformer common is accessible for connection to thermostat cable conductor and power to the transformer is not regularly interrupted by high temperature, purge cycle, or limit operation.

R8239D1015 Isolating Relay in the thermostat control circuit.

a,b

Check control amperage requirement.

a,c,b

D.F. • Rev. 10-94 • • ©Honeywell Inc. 1994 • Form Number 69-0750—1

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M3375

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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 mer-

cury 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 this control, or of an old control containing mercury in a sealed tube.

If you have questions, call Honeywell Inc. at 1-800468-1502.

Installation

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to follow them could 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 installation is complete, check out product operation as provided in these instructions.

CAUTION

1. Disconnect power supply to prevent electrical shock or equipment damage.

2. Run wires as close as possible to the subbase. To prevent interference with the thermostat linkage, keep wire length to a minimum. Push excess wire back into the hole and plug hole to prevent drafts from affecting thermostat operation.

3. Do not overtighten thermostat captive mounting screws because damage to subbase threads may result.

4. Do not short across coil terminals on relay; this may burn out the heat anticipator.

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:

— 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 behind the thermostat.

Run wires from the heating, cooling or heating-cooling equipment to the new thermostat location.

The number of wires required to connect this thermostat to the heating, cooling or heating-cooling equipment depends on how the thermostat is powered—by the 24 Vac or battery, or through the control system. Refer to the Typical Wiring Diagrams section to determine the number of wires required for your application.

UNPACK THERMOSTAT

Handle your new thermostat carefully; rough handling may interfere with its accuracy. Before unpacking, refer to Fig. 1.

Remove and discard the shipping wrap.

IMPORTANT: Save package of screws and instructions

for the homeowner.

Fig. 1—Unpack thermostat.

THERMOSTAT COVER

THERMOSTAT BASE

CAPTIVE MOUNTING SCREWS

LIFT COVER

M1518

Remove the thermostat cover by lifting from the bottom. Set aside cover until needed later.

Carefully remove the material protecting the mercury switch bulb.

Loosen two captive mounting screws and separate the wallplate (if provided) from the back of the thermostat base.

MOUNT WALLPLATE OR SUBBASE Wall Mounting (See Fig. 2)

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

Mark holes on the wall for anchors. Use the spirit level to make sure the wallplate or subbase is level.

Drill 3/16 in. holes and gently tap the anchors into the holes until flush with the wall.

Pull wires through the large wiring hole in the wallplate or subbase.

Loosely fasten the wallplate or subbase to the wall with the three screws. Do not tighten the screws completely.

Carefully level the wallplate or subbase and firmly tighten the screws. See Fig. 3.

Outlet Box Mounting (See 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 (beige) or 202689A (white) Cover Plate Assembly (ordered separately). Follow the instructions provided with the cover plate assembly.

Align wallplate or subbase mounting holes on the outlet box and loosely fasten with two screws.

Carefully level the wallplate or subbase and firmly tighten the screws. See Fig. 3.

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Fig. 2—Mounting wallplate or subbase to wall.

3 SCREW HOLES WITH PLASTIC ANCHORS

HEATING-ONLY WALLPLATE

FAN

HEATING/COOLING SUBBASE

Fig. 3—Leveling methods for wallplate or subbase.

AUTO OFF

HEATON

COOL

PLUMB BOB OR WEIGHT

PLUMB LINE

M1552A

FAN

AUTO OFF

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

3 SCREW HOLES WITH PLASTIC ANCHORS

SPIRIT LEVEL

COOL

HEATON

M857

M1555

EXISTING HORIZONTAL OUTLET BOX

FAN

AUTO OFF

HEATON

HEATING/ COOLING SUBBASE

COOL

M1553A

VERTICAL OUTLET BOX

NOT INCLUDED WITH UNIT.

ACCESSORY PARTS AVAILABLE.

EXISTING HORIZONTAL OUTLET BOX

HEATING-ONLY WALLPLATE

M856A

SUBBASE OR WALLPLATE

ADAPTER RING

MOUNTING SCREWS (2)

COVER PLATE

M1554A

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WIRING

Follow the instructions provided by the heating, cooling or heating-cooling equipment manufacturer. If not available, refer to the Typical Wiring Diagrams section.

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

NOTE: All wiring must comply with local electrical codes

and ordinances.

This thermostat clock can be powered by 24 Vac transformer with battery backup, 24 Vac transformer only or battery only, or through the control system. Refer to Figs. 16 through 19 for hookup diagrams of typical powering applications.

Wallplate (Heating-only wallplate included)

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

For heating-only systems, connect wires to R, W and C (if applicable) terminals. See Fig. 20. Firmly tighten 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.

NOTE: For cooling only or heating-cooling applications,

refer to Installation Instructions packed with the wallplate

or subbase.

Fig. 5—Methods of connecting terminals.

FOR STRAIGHT CONNECTION STRIP 5/16 in. [8 mm]

Fig. 6—Thermostat mounting.

TAB (2)

MOUNTING SLOT (2)

35 30

JUMPER WIRES

M3408

THERMOSTAT BASE

WALLPLATE OR SUBBASE

CAPTIVE MOUNTING SCREWS

INSERT CLOCK BATTERIES

Power is supplied to the clock by the 24 Vac transformer or two AAA alkaline batteries (included), or by the heating or cooling control circuit. Backup batteries may be installed to supply power to the clock if power is interrupted when using 24 Vac powering method.

Install the batteries in the thermostat. See Fig. 7.

Once a year or when batteries are dead, replace with two new AAA alkaline batteries. We recommend Energizer batteries.

FOR WRAPAROUND CONNECTION STRIP 7/16 in. [11 mm]

BARRIER

M1556B

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 wallplate or subbase.

Hang thermostat base on wallplate or subbase.

Insert the two captive mounting screws located in the bottom corners of the base. See Fig. 6.

Firmly tighten the screws.

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Fig. 7—Insert clock batteries.

BATTERY LOCATION FOR (2) AAA BATTERIES; INSTALL WITH POSITIVE ENDS UP

M7188

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SET CLOCK

Adjust the clock by moving the minute hand in a clockwise direction. Do not reverse the minute hand.

When time is correctly set, the time indicator arrow (Fig. 8) must point to the correct time and the corresponding daytime (light) or nighttime (dark) portion of the program dial.

Fig. 8—Set clock.

Adjust the heat anticipator lever to match the current rating of the primary control for the proper cycle rate (Fig. 9). Set adjustable anticipation for total current of heat and fan control.

Locate the current rating stamped on the control or valve (Fig. 10), or the setting given in the device instructions.

If no current rating or heat anticipator setting is given, measure the current with an ammeter. Proceed with the following steps.

PROGRAM DIAL

MINUTE HAND

TIME INDICATOR ARROW

M1813A

SET HEAT ANTICIPATOR

If T8090 is used on a steam system, skip to Attach Thermostat Cover section. When used on any other heating system, cut the two black heat anticipator jumper wires. See Fig. 9. Follow the remaining section steps.

Fig. 10—Current rating of primary control.

SHOWS VOLTAGE RATING

SHOWS ANTICIPATOR SETTING

8406

V8043E 1004 4 24V 50/60CY .32 AMP

@ 60CY

SHOWS VOLTAGE RATING

FROM MAIN FUEL SUPPLY

Fig. 9—Adjust heat anticipator.

24 Vac 50/60 Hz

0.4 AMP

TYPICAL GAS VALVEZONE VALVE

TO BURNER

SHOWS ANTICIPATOR SETTING

SHOWS CURRENT DRAW

30 VAC

0.2 AMP

OIL BURNER CONTROL

SHOWS VOLTAGE RATING

F F

M6116B

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Remove the thermostat from the wallplate or subbase. Connect an ac ammeter of appropriate range (about 0A to 2A) between the R and W terminals on the wallplate or subbase 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.

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. See Fig. 11.

Swing the cover downward until it catches at the bottom of the base.

Fig. 11—Attach cover.

M1519

SET TEMPERATURE CONTROL LEVERS

The two levers on top of the thermostat control the low and high temperatures for energy savings and comfort control. See Fig. 12. The lever on the left (blue mark) controls the lower temperature. The lever on the right (red mark) controls the higher temperature.

We recommend pushing the levers together at an appropriate temperature for either heat or cool until the occupant programs the thermostat and makes the final temperature selections.

Fig. 12—Temperature control levers.

LOW TEMPERATURE (BLUE MARK) SET LEVER

HIGH TEMPERATURE (RED MARK) SET LEVER

M859

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.

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

controlled 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

controlled by the thermostat for heating and cooling. To switch positions, use thumb or index finger to slide

lever to the desired position. Switch lever must stop in detent over the desired function indicator mark for proper circuit operation.

Checkout

CAUTION

Do not check operation by shorting across terminals of system controls. This will damage the heat anticipator.

HEATING-ONLY SYSTEM

Turn on power to the furnace. Push together both temperature setting levers at least 5° F

[3° C] above 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 room temperature.

The burner should shut off.

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 temperature setting levers to the desired tem-

peratures.

COOLING-ONLY SYSTEM

Turn on power to the cooling equipment. Push both temperature setting levers together at least

5° F [3° C] below room temperature. The cooling equipment should operate, and the fan should 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 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.

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If thermostat fails any test, refer to the Troubleshooting

Guide in the Owner’s Manual.

Reset both temperature setting levers to the desired

temperatures.

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.

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.

Place the system switch lever to COOL and the fan switch 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 together both temperature setting levers at least 5° F [3° C] above room temperature. The cooling equipment should shut off.

Place the fan switch to ON. The fan should run continuously 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 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.

Calibration

THERMOMETER

The thermometer in your thermostat was accurately calibrated at the factory. The thermometer should need adjustment only if it has been dropped or shifted due to mishandling. If the setpoint lever and the thermometer reading do not agree:

1. Remove the thermostat cover by pulling up from the

bottom of cover until it clears the mounting slots.

2. Set the thermostat cover on a table near an accurate

thermometer.

3. Allow five minutes for cover thermometer to sense area temperature; compare the readings. Be careful not to touch thermometer or breathe on it.

4. If the readings are the same, replace the cover and put the system into operation.

5. If the readings are different, insert a small screwdriver in the thermometer and turn it until the thermometers have the same reading. See Fig. 13.

6. Replace the thermostat cover and put the system into operation.

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

mometer reading. After making each adjustment, wait five or ten minutes for the thermometer to stabilize before comparing.

Fig. 13—Thermometer calibration.

INCREASE

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.

To check thermostat calibration, allow several hours of operation after installation. Then read the thermometer and remove the cover. Push the temperature levers together to a setting the 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 POSITION ARE APPROXIMATELY THE SAME AT THE INSTANT THE MERCURY MOVES TO THE OTHER END, NO RECALIBRATION IS NEEDED.

If calibration is necessary, proceed as follows:

1. 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. See 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.

3. Put the thermostat cover on and wait ten minutes.

4. Read the thermometer. Then remove the cover. Moving both levers, place the HIGH lever at the thermometer reading. Hold lever so it does not move, and gently turn the 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.

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Fig. 14—Use of 104994A calibration wrench.

CALIBRATION WRENCH

Fig. 17—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).

ANTICIPATOR SETTING LEVER

ANTICIPATOR SCALEPLATE

.35 .30

.25

.20

.10

Typical Wiring Diagrams

Fig. 15—Typical hookup for clock powered by separate 24 Vac transformer.

L1 (HOT)

CLOCK

HEAT RELAY

M1512B

HEAT RELAY

M1511A

THERMOSTAT

SUBBASE

Fig. 16—Typical hookup for clock powered by two AAA alkaline batteries only.

THERMOSTAT

SUBBASE

BATTERY

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

BATTERY BACKUP MAY BE USED IF POWER TO CLOCK IF INTERRUPTED.

BATTERY

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

M8583

L1 (HOT)

CLOCK

HEAT RELAY

M1513A

COMPRESSOR CONTACTOR

M1514C

THERMOSTAT

SUBBASE

Fig. 18—Typical hookup for clock powered through control system. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when heating equipment is off.

THERMOSTAT

BATTERY

SUBBASE

BATTERY

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

CLOCK

CCRHRC

L1 (HOT)

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

JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER

POWERS BOTH HEATING AND COOLING.

FOR POWER STEALING ON HEATING, JUMPER

C-RH AND C-W TERMINALS.

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Fig. 19—Typical hookup for clock powered through control system. Clock powered by battery when heating or cooling equipment is on; clock takes power from system when cooling equipment is off.

THERMOSTAT

CLOCK

BATTERY

CCRHRC

SUBBASE

L1 (HOT)

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

JUMPER RH-RC TERMINALS WHEN ONE TRANSFORMER

POWERS BOTH HEATING AND COOLING.

FOR POWER STEALING ON HEATING, JUMPER

C-RC AND C-Y TERMINALS.

Fig. 20—Internal schematic and typical hookup for T8090A Thermostat/191108AJ Wallplate in heatingonly system.

CLOCK

THERMOSTAT

HEAT ANTICIPATOR

HEAT RELAY

FALL

COMPRESSOR CONTACTOR

M720A

FALL

HEAT ANTICIPATOR

WALLPLATE

L1 (HOT)

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

FOR STEAM SYSTEM, KEEP JUMPER IN PLACE. FOR NON STEAM SYSTEM, CUT AND TAPE-OFF THE JUMPER AND ADJUST HEAT ANTICIPATOR FOR PROPER EQUIPMENT CYCLING.

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HEAT RELAY

M5349A

Page 10

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9

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