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

Page 16

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.

575/3/60

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

Page 15 Page 17
Image 16
Page 15 Page 17
Contents Gas-Fired, Power-Vented Table of ContentsModel FE and be Unit HeatersInstallation Codes WarrantySpecial Installations Aircraft Hangars/ Garages Fan-type unit heater is connected to a duct systemFan-Type, Power-Vented Unit Heater Dimensions inches DimensionsDimensions mm Dimensions contd Blower-Type, Power-Vented Unit Heater Dimensions inchesUnit Heater Location Uncrating and PreparationClearances & Combustion Air Clearances and Combustion Air contd Suspending the HeaterSuspension 25-400 6152 18457 12305Optional, Field-Installed Hanger Kits Four-Point Swivel Connectors Option CK10 See aVenting Specific Venting Requirements read all beforeVenting contd Structure Horizontal Vent Terminal ClearancesLocation all directions unless specified Gas Piping and Pressures Manifold or Orifice Pressure SettingsSizing a Gas Supply Line Thermostat and Thermostat Connections Electrical Supply and ConnectionsInstructions to Check Manifold Pressure Typical Wiring Diagrams -- Pages 12 Field Control Wiring Length and GaugeModel Size Speed Form 436, Mfg P/N 98807 Rev 8, Adjusting Belt Tension Thermostat Connections contdFan Motor Blower MotorBlower Speed Adjustment Blower RotationFan Control Limit ControlCombustion Air Proving Switch Burner Air AdjustmentGas Valve Pilot and Ignition SystemCheck Installation and Start-Up Check the installation prior to start-upCheck installation after start-up Start-Up -- Typical Operating SequenceOptional Vertical Louvers Option CD1 Optional Duct Flange Option CD9 Blower Models onlyOptional Vertical Louvers Sizes Range Air Deflection400 4935 550 Conversion Table Diameter to AreaOptional Guards Options CD10 & CD12 Blower Models only Model Filter Replacement P/N Size QtyOptional Multiple Heater Control Options CL31 & CL32 Burner Rack Removal Instructions for Burner Rack Removal See FiguresPilot Flame Tubing Sensor Lead Burner Rack Hinged DownBurner Rack Removal contd Burner Orifices Flash CarryoverHeat Exchanger Fan or BlowerFan contd Venter MotorOperating Gas Valve Fan and Limit ControlsTroubleshooting TRO Uble PRO Bable C Ause RemedyFor Service or REPAIR, Follow These Steps in Order Name Address Phone

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.

One of the key features of the FE and BE connectors is their robust construction. Made from high-quality materials, they are resistant to corrosion, moisture, and other environmental factors that could compromise the integrity of the connection. The connectors are engineered to withstand high temperatures and mechanical stress, making them ideal for use in harsh conditions where reliability is essential.

Moreover, the design of FE and BE connectors facilitates easy installation and maintenance. The connectors come with user-friendly features such as a clear labeling system and intuitive locking mechanisms, ensuring a secure fit and minimizing the risk of connection failure. Additionally, these connectors are compatible with various wire sizes, offering flexibility for different projects.

Technologically, Thomas & Betts has integrated advanced manufacturing processes to ensure precision and consistency in the production of FE and BE connectors. This attention to detail results in products that not only meet but often exceed industry standards, providing customers with peace of mind regarding their electrical systems.

In terms of performance, the FE and BE connectors deliver exceptional conductivity, which is critical for minimizing energy loss and ensuring efficient operation in electrical systems. This characteristic is especially important in applications where energy efficiency and reliability are paramount.

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.
Top Page Image Contents