12
GAS PRESSURE REQUIREMENTS
A MAJOR CAUSE OF OPERATING PROBLEMS WITH GAS APPLIANCES CAN BE IMPROPER GAS PRESSURE!
Problems such as changes in flame color or flame height, pilot or burner outages, intermittent operation,
changes in heat output, excessive burner noise, etc. are nearly always the result of changes in gas pressure
or improper gas pressure at the time of the installation.
Gas supplies normally enter a residence at 1/2 PSI (13" - 15" W.C.) (3. KPA). A regulator is then placed in-
side the residence, which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches" regula-
tor is of adequate capacity 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 most important item to check during the installa-
tion and the first thing to check when problems occur is gas pressure!
The following table provides information on correct gas pressure requirements.
GAS PRESSURE REQUIREMENTS
Be sure your gas supplier or
plumber carefully follows this table.
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)
1/16 - 3/16 "
OPEN
L.P. GAS
12.0" W.C
.
(3.00 kPa)
11" W.C.
(2.75 kPa)
13.0" W.C.
(3.24 kPa)
10.0" W.C.
(2.5 kPa)
1/4" OPEN-MIN.
TURN GAS VALVE KNOB TO "HIGH" POSITION. GAS PRESSURES MAY VARY PLUS OR MINUS 5%.
NOTE: For High Altitude (Above 5.000 Feet) Some Variations In Air Shutter Settings May Be Required.
Manifold pressure must
Figure 1: Gas Pressure Test Port
be taken at the Output Pressure tap and inlet pressure at the Inlet Pressure tap
with the burner
operating
by a qualified installer (see
).
Figure 1: Gas Pressure Test Ports
