Sure Heat VFMO Vent-Free - Manual (Page 4)

Page 4
GAS PIPING AND GAS PRESSURE REQUIREMENTS
FIREPLACE CLEARANCES
Check the type of gas that is supplied to your fireplace. Use only the gas type indicated on the heater’s rating
plate. If the gas listed on the plate is not your type of gas supply, DO NOT INSTALL THE SYSTEM. Contact
your dealer for the proper model.
All gas piping must be installed to comply with local and national fuel gas codes. Do not use flexible hose
unless it is allowed by local codes. Compounds used on threaded joints of gas piping musts be resistant to the
action of LP gas.
The gas supply line to the fireplace should not be less than 1/2” inside dimension.
The gas supply must be of sufficient size to provide a minimum natural gas pressure of 7 inches water column
for natural gas or 11 inches for L.P. gas. The maximum inlet gas pressure to the appliance must not exceed
10 inches for natural gas and 13 inches for L.P. gas. If this appliance is to be supplied with L.P. gas the tank
or bottle supplying the gas must have a regulator that reduces gas pressure between 11 and 13 inches water
column.
Include a manual shutoff valve and union in the line so the appliance may be disconnected for servicing.
Provide a 1/8” NPT plugged tapping for pressure gauge connection between shutoff valve and the appliance.
Test for leaks using soap and water solution after completing the connection. DO NOT USE OPEN FLAME!
To guarantee safe installation into a noncombustible fireplace, certain space requirements must be fulfilled.
1. The clearance from the side of the unit to any combustible wall should not be less than 15 1/2 inches.
2. The clearance from the ceiling to the top of the fireplace opening should not be less than 42 inches.
3. The minimum clearance to combustible items in front of the heat is 36 inches.
4. For any fireplace in which this unit is installed, there are certain mantel clearance requirements that
must be met.
Minimum Mantel Clearance Minimum Mantel Clearance with Canopy
You must have non-combustible material(s) above the fireplace opening. Non-combustible materials (such as
slate, marble, tile, etc.) must be at least 1/2 inch thick. Some decorative fireplace surrounds (cultured marble)
may get discolored from the heat produced by the system. With sheet metal, you must have non-combustible
material behind it. If non-combustible material is less than 8” you must install fireplace canopy
(Model AMG-100).
WARNING: The appliance and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of
1/2 psig (3.5 kPa). The appliance must be isolated from the gas supply piping system by
closing its individual manual shutoff valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2 psig. Pressures in excess of 1/2
psig will cause damage to the unit.