natural gas requirement for 3 ton RTU
natural gas requirement for 3 ton RTU
(OP)
What is the typical natural gas flow rate required for a 3 ton rooftop unit. Do these units usually have the capability of regulating flow (not pressure) on their own or does one need to supply a flow regulator





RE: natural gas requirement for 3 ton RTU
Hope this gets you started.
RE: natural gas requirement for 3 ton RTU
RE: natural gas requirement for 3 ton RTU
Once the fuel reaches your heating unit, the appliance regulator will further drop the gas pressure to the manifold pressure which is typically 3.5" w.c. Most gas valves cannot tolerate an upstream pressure greater than 14.0" w.c. This is why you typically find the delivery pressure set at about 7.0" w.c. Except propane which is delivered at a higher pressure, usually 11.0" - 11.5" w.c. Propane is delivered into the manifold at 10.5" w.c. in most cases. Minimun upstream pressure is about 5.0" w.c. for natural gas and 11.0" w.c. for propane.
You do not need to regulate the flow of gas. The gas flow rate is controlled by the number and type of orifices installed in the unit. Thus, gas pressure is critical and must be checked and verified by a licenced technician on start-up of the appliance.
Hope this helps.