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|NEW RE-CIRCULATING HEATER STANDARD|
The direct gas fired industry has had some significant changes in listing
requirements over the past few years. One of those changes was to the
ANSI Z83.18 standard for Re-circulating direct gas fired heaters. Under
this new standard, one of the restrictions is the amount of heat
(temperature rise) you can add to the space, based on percentage of fresh
air that is introduced into the building. After hours of research, design
and testing, our engineering team came up with a
new control system that will be used to meet this new requirement. This
new control system has been designed with our customer's safety, ease of
service and economics in mind. The name of the new control system is the
RCS System which is an acronym for "Re-circulating Control System".
The RCS System monitors return air temperature, fresh air temperature, will limit return air damper percentage, and will limit maximum discharge temperature. There are different RCS Systems available to best fit your application. Below is a chart on the different RCS Systems to pick from.
|How to pick the RCS System for your Application|
|Note: Always pick the RCS System closest to your minimum temperature conditions for best performance.|
|How does the RCS System work?|
The Re-circulating heater will modulate the return air and fresh air
bypass dampers based on the damper control selected: two-position,
photohilic, or manual potentiometer. The RCS System is designed to
limit percentage of return air and discharge temperature based on the
system selected as shown in the chart above. If the temperature drops
below minimum set points, the bypass dampers will drive to 100% fresh air
for a short time until minimum set points are satisfied. Once the trip
minimum set point is satisfied, the bypass dampers will return to normal
It is important when sizing and designing your Re-circulating heater to select the RCS System that best meets the application. When ordering a Re-circulating system, please specify the RCS system you would like to use; otherwise, a RCS system will be selected for you.