Filter
Top Products
11UH-PRC002-EN
Application
Considerations
High Pressure Regulators —
Natural Gas Only
The Trane indoor gas heating products
contained in this catalog, are designed
to operate at a pressure of 3.5-inch W.C.
(Water Column) when firing on natural
gas. This is the “manifold” pressure or
that which is present at the burner
orifices. All five and six-function valves
provide a built-in pressure regulator
which is capable of reducing “supply”
pressures from a maximum of 14-inch
W.C. (½ psi) down to
3.5-inch W.C. on the leaving side of the
valve. The valve typically “drops” about
1½-inch so the minimum supply
pressure is 5-inch W.C.
Whenever supply pressures exceed
14-inch W.C., a high pressure regulator
should be selected. We supply a
Rockwell regulator which is fitted with
pressure springs and capacity orificing
to meet the requirements of each
specific job.
Table AC-1 — Orifice Chart: Rockwell 043-182 Regulator
Inlet Capacity in MBH for Natural Gas Spring
Pressure 25-200 225-300 350-500 600 700 800 Required
1 psi 3/8” N/A N/A N/A N/A N/A Blue (only)
2 3/8” 3/8” N/A N/A N/A N/A Blue (only)
3 3/8” 3/8” 3/8” N/A N/A N/A Blue or Green
5 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” Blue or Green
10 3/8” 3/8” 3/8” 3/8” 3/8” 3/8” Blue or Green
20 1/4” 1/4” 1/4” 1/4” 1/4” 5/16” Blue or Green
40 1/4” 1/4” 1/4” 1/4” 1/4” 1/4” Blue or Green
60 1/8” 1/8” 1/8” 1/8” 1/8” 3/16” Blue or Green
80 1/8” 1/8” 1/8” 1/8” 1/8” N/A Blue or Green
100 1/8” 1/8” 1/8” 1/8” 1/8” 1/8” Blue or Green
125 1/8” 1/8” 1/8” 1/8” 1/8” 1/8” Blue or Green
In order to select the proper spring/
orifice combination, we need to know
what the supply pressure is on that
particular job and the input size of the
unit being ordered. More than one unit
can be run from one regulator; however,
we recommend that each unit have its
own regulator.
We require that the “job” supply
pressure be included on all jobs
requiring high pressure regulators along
with the unit size. The table that follows
displays the regulators range as it
pertains to inlet pressure and MBh. N/A
requires the customer to contact a local
utility or an industrial supply house.
These devices are not available from
Trane for LP gas. LP accessories must be
secured from the gas supplier/ supply
house.
Minimum/Maximum
Gas Inlet Pressures
Gas valves are suitable to a maximum
inlet pressure of 0.5 psi (14 inches water
column) on natural gas. If the main gas
supply pressure is greater than
14 inches W.C., a step-down pressure
regulator must be field installed ahead of
the gas valve. Minimum inlet pressure for
natural gas units is 5 inches W.C.
For LP (propane) gas, the minimum inlet
pressure is 11.0 inches W.C.
and the maximum inlet pressure is
14.0 inches W.C.