11
GCUF/GRUF Vent-Free Fireboxes
Monessen • GCUF/GRUF Owner Manual • 71D0530 • Rev G • 01/20
GAS LINE INSTALLATION
Consult all local codes. All gas piping must be installed to
comply with local codes, or in the absence of local codes,
with the latest edition of the National Fuel Gas Code ANSI
Z223.1/NFPA54.
The 1/2" gas line may enter either from the left side or right
side of the firebox. Gas access holes are provided on both
sides of the firebox.
A listed manual shutoff valve must be installed upstream of
the appliance. A union tee and plugged 1/8" NPT pressure
tapping point should be installed upstream of the appliance.
IMPORTANT: Install main gas valve (equipment shutoff
valve) in an accessible location. The main gas valve is
for turning on or shutting off the gas to the fireplace.
A sediment trap may be upstream of the heater to prevent
moisture and contaminants from passing through trap to
the heater controls and burners. Failure to do so could
prevent the heater from operating reliably. Consult appli-
cable codes.
An external regulator must be used on all propane/L.P.G.
heaters, in addition to the regulator fitted to the heater, to
reduce the supply tank pressure to 13" w.c. (maximum).
Any copper tubing used to supply propane / L.P.G. from
the tank must be internally tinned.
NOTE:
When connecting propane / L.P.G. vent-free
room heaters, you must use pipe sealant resistant to
propane / L.P.G.
IMPORTANT: Hold heater regulator with a wrench to
prevent movement when connecting to inlet piping.
Check gas type: The gas supply must be the same as
stated on the heater’s rating plate. If the gas supply
is different, DO NOT INSTALL THE HEATER. Contact
your dealer for the correct model.
After completing connection, test all gas joints from the
gas meter to the gas heater regulator for leaks. Using
soap and water solution or a gas sniffer. DO NOT USE
AN OPEN FLAME.
WARNING!
Plumbing connections should only be performed
by a qualified, licensed plumber. Main gas
supply must be off when plumbing gas line to
fireplace or performing service.
WARNING!
Connecting directly to an unregulated propane
/ L.P.G. tank can cause an explosion.
WARNING!
Do not connect directly to natural gas 1/2 PSI or
2 PSI systems. Always make sure natural gas
pressure is regulated 10.5 w.c. (maximum before
operating the unit).
