Gas Pressure Requirements - Mendota DXV-42 Installation & Operating Instructions Manual

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. are nearly always the result of changes in gas pressure or im-
proper 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
residence, which drops this pressure to 7" W.C. (1.8 KPA) (Nat. Gas). This "inches to inches" regulator is of ade-
quate 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 following table provides information on correct gas pressure requirements. Be sure your gas supplier or
plumber carefully follows this table.

GAS PRESSURE REQUIREMENTS

NATURAL GAS
L.P. GAS
TURN GAS VALVE KNOB TO "HIGH" POSITION. GAS PRESSURES MAY VARY PLUS OR MINUS 5%
Manifold pressure must be taken at the outlet ("MANIFOLD") tap and the inlet pressure at the "SUPPLY" tap
with the burner operating by a qualified installer (see FIGURE 2: Gas Valve Pressure Test Ports).
GAS PRESSURE REQUIREMENTS
DESIRED MINIMUM
INLET INLET
PRESSURE PRESSURE
7.0" W.C. 5.0" W.C.
(1.75 kPa) (1.12 kPa)
11.0" W.C. 11" W.C.
(2.75 kPa) (2.75 kPa)
*AIR SHUTTER POSITION MAY VARY WITH ALTITUDE ABOVE 5,000 FT.
FIGURE 2: Gas Valve Pressure Test Ports
MAXIMUM MANIFOLD
INLET OUTLET
PRESSURE PRESSURE
11" W.C. 3.5" W.C.
(2.61 kPa) (0.87 kPa)
13.0" W.C. 10.0" W.C.
(3.24 kPa) (2.5 kPa)
7
AIR SHUTTER
POSITION
1/8 - 1/4 " OPEN
(7 mm)
1/2 " OPEN – min.
(14 mm)