FAQ

A: 90% of quote requests for heater are processed within three business hours. Heaters requiring engineering review due to amperage, watt density, application and specific end product could take a business day or longer. Most purchase orders are confirmed within 3 business hours. For oven quote, it will take a longer 1-2 days due to material calculation and design selection.
A: The delivery date for your heater order can vary depending on the time of year and order quantity. For qty < 10 pieces, it is usually 3-5 business days. For customized oven, the delivery time is typically 4-8 weeks depending on size and complexity.[/toggle][toggle title="Does Jin Gang customize heaters/Oven for my specific needs?" open="no"]A: Jingang can customize your heater/oven order. Depending on the type of customization and order quantity, your jingang sales representative will work with you to build a heater/oven system that meets your exact needs.[/toggle][toggle title="How do I choose an electric heater? " open="no"]A: The first step is to carry out a heat loss calculation for your premises, this will tell you the size of heater you need. Next decide what type of heater you want. Finally, talk to your electrician to make sure your electricity supply is suitable for the heater you intend to use.[/toggle][toggle title="I have a 3 phase supply, should I choose a single phase or 3 phase electric heater ? " open="no"]A: Always choose a 3 phase electric heater. The control panel and cabling will be less expensive.[/toggle][toggle title="What are my Temperature Requirements?" open="no"] A: Not all airflow patterns are created equal. Different airflow patterns are needed for different part geometry and processes.  Choices include vertical airflow, full horizontal airflow, and horizontal/vertical (combined). Vertical Airflow – is best suited for processes where parts are hung from racks or hooks, with the air supplied from the top down or bottom up.

Full Horizontal Airflow – is used when product is loaded onto shelves or a shelf cart for processing. With the supply on one side and the return duct on the other, the product becomes encircled with air.

Horizontal/Vertical Airflow – is suitable for applications with large parts, and where there is a need for air circulation to be supplied from both sides and then returned to the top of the oven.  

A: Oven temperature uniformity is important to ensure uniform heating of the product.  This is different from control sensitivity.  

Uniformity – is the greatest deviation, in degrees, between the lowest and highest temperature points within the work area.  For example, it is important to note that ±5°F represents an actual difference of 10°F (5.5°C).

Control Sensitivity – relates to the ability of a control instrument to measure and react to temperature fluctuations at a given set point.

Many factors influence uniformity:

  • Controller calibration
  • Sensor calibration
  • Sensor placement within the work area
  • Oven operating temperature (higher temperature/greater variables)
  • Air circulation (the greater the air circulation, the better the uniformity)
  • Placement of the product within the work area
  • Product geometry
  • Airflow pattern
  • Heat loss through walls
  • Metal-to-metal conduction
  • It is important to take all of these variables into consideration and to utilize a 10-point thermocouple test to ensure that the specified uniformity is obtained for the application. Although this 10-point test is not always included with the oven purchase, it is recommended and usually available for an additional cost. Some applications such as paint or resin curing require a temperature uniformity of ±10°F (±5.5°C). Many drying or preheating processes only require a uniformity of ±20°F (±11°C). Some technical processes need a uniformity of ±5°F (±2.7°C). Knowing your temperature uniformity requirements will help with oven selection.

    A: Some factors to consider when determining the proper oven chamber size are:

  • The maximum dimensions of your products
  • The required spacing between multiple parts, and between the parts and any ductwork (Usually this dimension is 3” to 6″)
  • The quantity of units to be processed in a single batch, and the space they will require after considering the required clearances
  • The method of material handling, being sure you have enough room to move the product in and out of the oven safely
  • After these factors have been determined, you will have arrived at an approximate work area dimension. If the work area is too small, there may be an inadequate amount of space between parts, which will result in less than optimal oven performance due to poor airflow. Similarly, when the work area is too large, there is an excess of space to heat and circulate air through, which wastes energy, space and, most importantly, time.