7
GAS PRESSURE REQUIREMENTS
A MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS APPLIANCES CAN BE IMPROPER GAS PRESSURE!
Such problems as changes in flame color or configuration, gas pilot or burner outages, intermittent operation, changes in
heat output, excessive burner noise, etc. can be the result of changes in gas pressure or improper gas pressure at the time
of the installation. The most important item to check during the installation and the first thing to check when problems
occur is gas pressure!
Gas supplies normally enter a residence at 1/2 PSI (13" - 15" W.C.) (3. KPA). A regulator is then placed inside the resi-
dence which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches" regulator is of adequate capaci-
ty to service the gas appliances (such as dryer, furnace, etc.). If this regulator's capacity is not sufficient to add the Gas
Fireplace, an additional "inches to inches" regulator must be installed for the Fireplace. EXCEPTION: Some codes allow
2 PSI (1.4KPA) supplies to enter the residence, in which case "pounds to inches" regulators are used.
The following table provides information on correct gas pressure requirements. Be sure your gas supplier or plumber
carefully follows this table.
GAS PRESSURE REQUIREMENTS
DESIRED
INLET
PRESSURE
MINIMUM
INLET
PRESSURE
MAXIMUM
INLET
PRESSURE
MANIFOLD
OUTLET
PRESSURE
AIR SHUTTER
POSITION
NATURAL GAS
7.0" W.C.
(1.75 kPa)
5.0" W.C.
(1.12 kPa)
11" W.C.
(2.61 kPa)
3.5" W.C.
(0.87 kPa)
1/8 - 1/4 " OPEN
(7 mm)
L.P. GAS
11.0" W.C
.
(2.75 kPa)
11" W.C.
(2.75 kPa)
13.0" W.C.
(3.24 kPa)
10.0" W.C.
(2.5 kPa)
1/2 " OPEN – min.
(14 mm)
TURN GAS VALVE KNOB TO "HIGH" POSITION. GAS PRESSURES MAY VARY PLUS OR MINUS 5%
*AIR SHUTTER POSITION MAY VARY WITH Altitudes ABOVE 5,000 FT.
Manifold pressure must be taken at the outlet ("MANIFOLD") tap and inlet pressure at the "INLET" tap
with the
burner
operating
by a qualified installer (see FIGURE 2: Pressure Test Port).
FIGURE 2: Pressure Test Port
