Honeywell T4398B User Manual

Electric Heating Thermostat

APPLICATION

The T4398 Electric Heating Thermostat provides precise, accurate line voltage control of electric heating equipment. A snap action switch makes the heating circuit on temperature fall. B models feature double-line break in the Off position.

T4398A,B Precision

PRODUCT DATA

FEATURES

• Controls both fan-forced and baseboard electric heaters.

• Vapor-filled dual diaphragm sensing element provides high-temperature sensitivity with minimum droop.

• Canadian Standards Association (CSA) Performance Certified up to 20A.

• CSA Certified, UL Listed up to 5 kW at 277 Vac.

• Long-life, industrial-grade Micro Switch™ mechanism.

• Rugged-engineered, plastic mounting base with captive mounting screw.

• Color-coded flyleads compatible with aluminum wire for quick installation.

• Replaces any standard wall-mounted electric heat thermostat.

• Contemporary white styling.

• Operating temperature range of 50°F to 80°F (10° C to 30° C).

• Celsius and fahrenheit models available.

• Optional thermometer.

• Altitude compensation feature.

• Frost protection setting (A models only).

• Optional locking cover and range stops available.

69- 1604

T4398A,B PRECISION ELECTRIC HEATING THERMOSTAT

SPECIFICATIONS

Models:

T4398A: Makes heating circuit on temperature fall. With

setting knob at far left (counterclockwise) position, provides calibration-free frost protection setting of 40°F (4°C). See Fig. 2.

T4398B: Makes heating circuit on temperature fall. With

setting knob at Off position, provides double line break for fuse-protected 240V heating circuits. (See Fig. 3.)

Both models feature optional thermometer, located in the

cover, to indicate the actual room temperature.

Accessories (Not Included):

272804A Range Stop and Cover Locking Assembly:

Allows field-selection of minimum and maximum temperature settings. Includes range stop assembly, cover locking-screws and wrench.

Setting Range:

Fahrenheit Models: Indicates range of 50°F to 80°F with

marking indications in 5°F increments.

Celsius Models: Indicates range of 10°C to 25°C with

marking indications in 1°C increments.

Differential:

Approximately 2°F (1°C) mechanical and thermal, non-adjust-

able.

Switch Type:

Enclosed industrial-grade Micro Switch˜™ snap switch.

T4398A: Single-line break (single-pole, single-throw). T4398B: Double-pole, single-throw with double-line break

(double-pole, single-throw) in Off position.

Wiring Connections:

Six-inch (150 mm) stranded copper leadwires suitable for con-

necting to aluminum wiring if approved special service CO/ ALR connectors are used.

Electrical Rating:

22A non-inductive at 120/208/240 Vac. 19A non-inductive at 277 Vac.

Approval Ratings:

Underwriters Laboratories Inc: Listed; file no. E47434,

guide no. XAPX.

Canadian Standards Association: File no. LR1322.

Mounting:

Direct mounting on NEMA standard vertical 2 in. x 4 in. switch

box, or 4 in. x 4 in. box using 6-32 slot Robertson™ screws.

Sensing Element:

Vapor-filled, hermetically-sealed, stainless steel, dual dia-

phragm.

Thermometer (Optional):

Coil bimetal 50°F to 90°F (10°C to 30°C).

Barometric Sensitivity:

1°F/500 ft (0.3°C/kPa).

Dimensions:

See Fig. 1.

FRONT VIEW SIDE VIEW

1-3/4

(48)

•

˚F

4-3/8 (111)

3/4

(19)

1/2 (13)

2-1/8

(54)

3-1/4

(83)

Canadian Standards Association Performance Rating:

20A at 120/208/240 Vac.

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2-7/8 (73)

1-1/2

(39)

1/2 (13)

Fig. 1. T4398A,B dimensions in in. (mm).

M5795A

INSTALLATION

WARNING

120-277 Volt Line Voltage Hazard. Can cause serious injury or death.

Do not install thermostat unless you are a trained, experienced electrical service technician.

CAUTION

Electrical Shock Hazard. Can cause personal injury and equipment damage.

Disconnect power supply before connecting wiring. Use a limit control when wiring the thermostat.

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.

T4398A,B PRECISION ELECTRIC HEATING THERMOSTAT

NOTE: Make line voltage wiring connections directly to the

leadwires installed on the thermostat, using wire connectors approved for the number and size of conductors.

IMPORTANT

When using aluminum conductors, all wiring connections to the thermostat must be made to the factoryinstalled lead wire, using approved CO/ALR solderless connectors.

1. Connect all wires with the thermostat cover in place. Be sure that all wire connectors are tight. Install any security features. See Fig. 2 and 3.

2. Pre-bend the solid conductors and push them into the electrical box.

3. Remove the thermostat cover by grasping both the top and bottom of the cover and pulling out..

IMPORTANT

Carefully handle the thermostat. Excessive pressure can damage the control knob or sensing element.

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

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 rating 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.

5. Follow local codes for installation and application.

Selecting Location

— Mount the thermostat on an approved electrical junction

box.

— Locate the thermostat 4 to 5 ft (1.5m) above the floor on an

inside wall where the thermostat can be exposed to average room temperature.

— Locate the thermostat away from concealed warm or cold

water pipes, light switches and dimmers, and refrigerators.

— Locate the thermostat away from drafts of hallways,

fireplaces, stairways, and fans.

Mounting

When replacing an old line voltage thermostat: — Carefully remove the old thermostat to avoid damaging the

wiring insulation.

— Check the old insulation for cracks, chips, or fraying and

apply approved electrical tape, where necessary, to ensure adequate insulation.

4. Turn the dial so the setpoint indicator is at the 12 o’clock position. (This prevents accidental damage to the dialstop during mounting.)

5. Using the screwdriver, secure the thermostat to the electrical box by tightening the two mounting screws. See Fig. 4.

6. Level the thermostat only for appearance.

7. Tighten the screws and replace the cover.

T4398A

SOLDERLESS CONNECTORS

L1 (HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

USE SPECIAL SERVICE CO/ALR SOLDERLESS CONNECTORS

WHEN CONNECTING ALUMINUM CONDUCTORS OR A FIRE HAZARD MAY RESULT.

USE A SEPARATE LIMIT CONTROL IN THE HEATING APPLIANCE.

BREAKS AND REMAKES BELOW -31°F (-35°C); NORMALLY

THERMAL ACTIVATED. BREAKS ON TEMPERATURE RISE; MAKES ON TEMPERATURE FALL.

ELECTRIC HEATER

M5791B

Fig. 2. T4398A typical hookup.

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