12. Thermostat Connections (cont'd)

There are some unique wiring requirements with the installation of the optional controls (relay and two-stage). Figure 12 illustrates the wiring of the relay and the connections required for optional thermostat control.

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Figure 12 - Wiring Diagrams for Optional Controls

Multiple Heater Control - These unit heaters are not designed for multiple unit connection to one thermostat. If you require that more than one unit be controlled by a single thermostat, it will be necessary to use relays in the circuit. Options CL31 and CL32 provide the necessary parts and instructions for multiple heater control. For more information on these options, see Paragraph 30.

13. Fan Motor

Fan motors are equipped with thermal overload protection of the auto- matic reset type. Should the motor refuse to run, it may be because of improper current characteristics. Make certain that the correct voltage is available at the motor.

NOTE: If the unit is equipped with an optional totally enclosed motor, the horsepower may be larger than the standard motor. Refer to the motor nameplate to verify horsepower.

14. Blower Motor

Blower Model Sizes 25-100are standardly equipped with a direct drive motor; an optional belt drive motor is available on Sizes 50-100. Blower Model Sizes 125-400have an adjustable belt drive motor.

As part of the Check/Test/Start (Paragraph 24), check the belt for proper tension. Proper belt tension is important to the long life of the belt and motor. A loose belt will cause wear and slippage. Too much tension will cause excessive motor and blower bearing wear. Adjust the belt tension by turning the adjusting screw on the motor base until the belt can be depressed 1/2-3/4". (See Figure 13.) After correct tension is achieved, re-tighten the locknut on the adjusting screw.

Most blower motors are equipped with thermal overload protection of the automatic reset type. If a motor is not equipped with thermal over- load protection, the unit will be equipped with a starter. The adjustable setting on the starter will be factory set to match the amp draw of the

Figure 13 -

Adjusting Belt

Tension

motor and sealed. No change should be made to starter set unless the original motor is replaced.

Starters are supplied from the factory for manual reset operation. If an overload condition is experienced, the condition must be corrected, and the starter must be manually reset.

After the installation is complete including all ductwork, the amp draw of the motor should be checked with an amp meter to verify that the motor amp rating on the motor nameplate is not being exceeded. Amps may be adjusted downward by reducing blower speed for by increas- ing the duct system static pressure. The temperature rise must be within the range specified on the unit rating plate.

Form 436, Page 16

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Thomas & Betts FE, BE warranty Thermostat Connections contd, Fan Motor, Blower Motor, Adjusting Belt Tension
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BE, FE specifications

Thomas & Betts, a subsidiary of ABB, is renowned for its innovative electrical products and solutions, particularly in the fields of connectors, terminals, and wiring devices. Among its extensive product lineup, the FE and BE series stand out for their exceptional performance and versatility in various applications.

The FE (Flat Eye) and BE (Blank Eye) connectors are designed to provide reliable electrical connections in demanding environments. These connectors are particularly well-suited for industrial, commercial, and residential applications, ensuring that they meet the rigorous standards required in these fields.

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In summary, Thomas & Betts FE and BE connectors embody a perfect blend of durability, ease of use, and technological advancement. Their robust design, compatibility with various wire sizes, and resistance to environmental stressors make them a preferred choice for professionals in the electrical industry. With a commitment to quality and innovation, Thomas & Betts continues to set the standard in electrical connectivity solutions, ensuring that their products remain at the forefront of the industry.
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