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Checking Manifold Pressures
Both Propane and Natural gas valves have a built-in pressure
regulator in the gas valve.
Natural gas models will have a manifold pressure of
approximately 3.5-inch w.c. (.871kPa) at the valve outlet with
the inlet pressure to the valve from a minimum of 4.5-inch w.c.
(1.120kPa) for the purpose of input adjustment to a maximum of
14.0-inch w.c. (3.484kPa).
Propane models will have a manifold pressure of approximately
10.0-inch w.c. (2.49kPa) at the valve outlet with the inlet pressure
to the valve from a minimum of 10.8-inch w.c. (2.68kPa) for the
purpose of input adjustment to a maximum of 14.0-inch w.c.
(3.484kPa).
Gas Supply Pressure (inches w.c.)
Minimum
Normal
Maximum
Natural Gas
4.5
7.0
14.0
LP (Propane)
10.8
11.0
14.0
Manifold Pressure (inches w.c.)
Normal (HI)
Natural Gas
3.5
LP (Propane)
10.0
HI/LO
REGULATOR
CONTROL KNOB
PRESSURE
TAPS
Figure 6 - Millivolt Valve
OUTLET
PRESSURE
TAP
INLET
PRESSURE
TAP
Figure 7 - IP Valve
Installing a New Main Gas Shut-Off Valve
Each appliance must have its own manual gas shut-off valve
located in the vicinity of the fireplace. Where none exists, or
where its size or location is not adequate, contact your local
authorized installer for replacement or relocation.
Test for leaks. Turn fireplace off. Compounds used on threaded
joints of gas piping must be resistant to the action of liquefied
petroleum gases. The installer must check all gas connections
for leaks. Perform all leak tests with a leak test solution or soap
solution. Rinse off all solution once testing is complete. Perform a
pressure test on all unexposed connections.
Never use an exposed flame to check for leaks. Never pressure
test with fireplace connected; control valve will sustain damage.
Disconnect the fireplace from piping at the control valve inlet and
cap the pipe before pressure testing.
NOTICE:
The millivolt gas controls are equipped with a captured
screw type pressure test point, therefore it is not necessary to
provide a 1/8-inch test point upstream of the control.
When using copper or flex connector use only approved fittings.
Disconnect the appliance and its individual shut-off valve from
the gas supply piping system during any pressure testing of that
system at test pressures in excess of 1/2 psig (3.5kPa).
Isolate the appliance from the gas supply piping system by
closing its manual shut off valve during any pressure testing of
the gas supply piping system at test pressures equal to or less
than 1/2 psig (3.5kPa).
WARNING
If one of the procedures results in pressures in excess of
1/2 psig (14-inch
w.c.) (3.5 kPa) on the fireplace gas valve, it
will result in a hazardous condition.
GAS SUPPLY
