Monessen Hearth GCUF Series User Manual

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12 
71D0530
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.
Remove the baseplate for ease of gas line installation. Remove screws along the front edge of the baseplate and botom center 
piece of the firebox and set aside. Lift baseplate and pull toward you. Replace baseplate prior to connecting gas line to heater. 
Consult heater installation and operating instructions for correct installation of the heater into the firebox.
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 tap-
ping point should be installed upstream of hte 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 applicable 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.
Plumbing connections should only be performed by a qualifi ed, licensed plumber. Main 
gas supply must be off when plumbing gas line to fi replace or performing service.
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ARNING
Connecting directly to an unregulated 
propane / L.P.G. tank can cause an 
explosion.
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ARNING
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). 
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ARNING