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6
Gas Information
A. Fuel Type
Check gas type: The gas supply must be the same as
stated on the appliance rating plate. If the gas supply is
different, DO NOT INSTALL THE APPLIANCE. Contact
your dealer for the correct model.
B. Gas Pressure
• Optimum appliance performance requires proper input
pressures.
• Gas line sizing requirements will be determined in ANSI
Z223.1 National Fuel Gas Code in the USA.
• Pressure requirements are:
Gas Pressure
Minimum inlet pressure
Maximum inlet pressure
WARNING! Risk of Fire or Explosion!
will damage valve. Low pressure could cause explosion.
• Verify inlet pressures. Verify minimum pressures when
other household gas appliances are operating.
• Install regulator upstream of valve if line pressure is
greater than 1/2 psig.
WARNING
Fire Risk.
Explosion Hazard.
High pressure will damage valve.
• Disconnect gas supply piping BEFORE
pressure testing gas line at test pressures
above 1/2 psig.
• Close the manual shutoff valve BEFORE
pressure testing gas line at test pressures
equal to or less than 1/2 psig.
Note: Have the gas supply line installed in accordance with
local codes, if any. If not, follow ANSI Z223.1. Installation
should be done by a qualified installer approved and/or
licensed as required by the locality. (In the Commonwealth
of Massachusetts installation must be performed by a
licensed plumber or gas fitter).
Note: A listed (and Commonwealth of Massachusetts ap-
proved) 1/2 in. (13 mm) T-handle manual shut-off valve
must be installed upstream of the appliance. A union tee
and plugged 1/8" NPT pressure tapping point should also
be installed upstream of the appliance.
IMPORTANT: Install manual shut-off valve (equipment
shutoff valve) in an accessible location. The manual
shut-off valve is for turning on or shutting off the gas to
the firebox.
Natural Gas
Propane
5.0 in. w.c.
11.0 in. w.c.
10.0 in. w.c.
13.0 in. w.c.
High pressure
Monessen • LCUF32/36/42 Installation Manual • 4142-901 • Rev A • 01/21
C. Gas Connection
• Reference Section 3 for location of gas line access in
appliance.
• The gas line may enter from the left side or right side of
the firebox. Gas knockouts are provided on both side
of the firebox. See Figure 6.1.
Gas
Access Holes
Figure 6.1
• The gap between supply piping and gas access hole may
be caulked with caulk with a minimum of 300ºF continuous
exposure rating or stuffed with non-combustible, unfaced
insulation to prevent cold air infiltration.
• Ensure that gas line does not come in contact with outer
wrap of the firebox. Follow local codes.
• Pipe incoming gas line into firebox.
• Refer to vent-free gas appliance installation instructions
for gas connection and lighting instructions.
WARNING! Risk of Fire or Explosion!
when attaching pipe to prevent bending gas line.
• A small amount of air will be in the gas supply lines.
WARNING! Risk of Fire or Explosion!
during line purge could ignite.
•
Purge should be performed by qualified service
technician.
•
Ensure adequate ventilation.
•
Ensure there are no ignition sources such as sparks or
open flames.
Light the appliance. It will take a short time for air to purge
from lines. When purging is complete the appliance will
light and operate normally.
WARNING! Risk of Fire, Explosion or Asphyxiation!
Check all fittings and connections with a non-corrosive
commercially available leak-check solution. DO NOT use
open flame. Fittings and connections could have loosened
during shipping and handling.
Support control
Gas build-up
17
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