Guangzhou Precise Heater Co., Ltd.
Our Precise Heater Way Values For 30 years, PreciseHeater’s commitment to innovation has created a steady stream of new products, a devoted and capable workforce and constant growth. We strive to
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Metal Over-The-Side Immersion Heater
Precise Heater Over-the-Side heaters are designed to provide the maximum in application flexibility and to minimize installation cost. They are ideal for jobs where easy installation and quick replacement or cleaning must be accomplished without emptying the tank.
To prevent burnouts from spot overheating and to keep elements out of sludge that normally collects in the bottom of the tank. Standard legs are 1-1/2” high; lengths up to 4” are available at no extra charge.
To strengthen the joint between the riser and element junction box. Gussets are welded to the box and riser to provide this reinforcement.
To place outlet box 6” away from riser and process tank, preventing damage to electrical connections due to evaporation. Longer arms are available at a nominal additional charge.
Protects electrical connections from wash downs, splashing and dripping. Standard on all heaters.
Heaters have welded joints, pressure tested before assembly.
Standard heaters are designed for a maximum operating temperature of 250° F. Contact factory for higher temperature applications.
Over-the-Side Heaters are built with tubular electric resistance elements soldered or welded to a fabricated box. The heater can be installed in holding or storage tanks to heat a fluid. Standard designs utilize a riser tube to route the electrical wiring up above the fluid level of the tank.
Instructions for Industrial Control Panels, if provided, are per IOM ENM - 2179. For additional product information and offerings, refer to Indeeco catalog literature on Circulation Heaters, Immersion Heaters, or Tubular Heating Elements.
Standard construction is rated for 250o F. High temperature designs are also available. For high temperature heaters, the heater design features must be closely matched to the application. For end use applications, it is the responsibility of the installer to verify suitability through testing and installation of temperature regulating and temperature limiting controls.
The heating elements are available in various watt density ratings. Operating temperature, watt density and flow velocities (agitated tanks) determine the element surface temperature. Life expectancy of the heating element is directly related to its surface temperature.
Temperature regulating devices, temperature limiting controls, or low liquid level are recommended for use with Over-the-Side Heaters, to control the heating process and safeguard the heater from excessive temperatures that can cause damage. Also on liquid systems, damage to fluid could occur if the heater is allowed to exceed the maximum film temperature recommended by the manufacturer.
PreciseHeater Over-the-Side Heaters can be specially designed for use in hazardous areas as specified in Article 500 through 516 of the National Electrical Code. Refer to the heater nameplate for classification of the heater provided.
It is the ultimate responsibility of the user to verify that the construction materials provided in the PreciseHeater Immersion Heater are suitable for use with the process fluid. Specifically, corrosion issues must be reviewed. Heater watt density and operating temperature must also be properly matched to the application. Indeeco can provide assistance if operating conditions are provided, but cannot be responsible for heater failure due to corrosion or excessive temperature.
Handling and Storage
Care must be taken to avoid damage to the heater and tubular elements during storage and handling.
Protect the heater from weather damage during storage if shipping packaging is not sealed. It is recommended to store the heater in a cool dry area to help prevent the heating elements from drawing moisture.
Mechanical Instructions
Site Selection
Review the NEMA Type rating of the heater. Contact the factory if unsure of the rating. Do not install a heater in an area not consistent with its rating.
Allow sufficient free space around heater installation site. Work space for heater maintenance should be at least three feet in front of the heater. The minimum pull space for the Over-the- Side Heater installation or removal from the tank should be considered.
Electric heaters are capable of developing high temperatures. Therefore, extreme care should be taken to
avoid mounting heaters in an atmosphere containing combustible gases, vapors, dusts, or fibers unless properly marked as suitable for the condition.
Heater Orientation
This heater has been constructed for either horizontal or vertical mounting. It must be mounted in this manner, to prevent improper operation or damage.
In either case, the riser tube must be oriented vertically with the electrical outlet box located above the highest fluid level.
Liquid level switches and thermal protection must be positioned above the highest point of the heating elements to properly protect the heater.
When securing the heater to the tank is required, thermal expansion of the heating elements must be considered. Anchor at only one end, or provide slotted or sliding mounts at the other end of the heater. Thermal expansion of the heating elements can be approximated as:
Field supplied conductors must be sized for at least 125% of the circuit current.
To calculate the circuit (in amps):
Wiring to the heater should be permanently installed in metallic or non-metallic electrical grade conduit in accordance with all applicable electrical codes, and should include a grounding conductor if non-metallic conduit is used.
Field supply wiring must be rated for 600Vac. Use copper conductors.
The electrical installation should include a service disconnect switch in sight of the heater, as well as branch circuit over- current protection and over-temperature protection (if not provided with the heater).
Wiring recommendations noted on the wiring diagram when application data provided to Indeeco. An additional copy is provided on the wiring diagram inside the heater terminal box.
Where thermocouple extension wire is required between the heater and control panel, verify it is connected with proper polarity as shown on the wiring diagram. Failure to do so may result in an uncontrolled heater. Refer to the wiring diagram for the required wire type. Shielded wire is recommended to reduce signal interference.