Hearthstone Quality Home Heating Products, Inc.
Bristol DX Model 8762
27
Gas Connections
The gas supply connection is made to the Bristol
’s
gas control valve under the bottom left center of the
unit using a 3/8” male NPT fitting. The supply line
should be ½” diameter, or appropriately sized to
provide a sufficient gas supply to meet the maximum
demand of the unit without undue loss of pressure.
We recommend a flexible line to avoid undue
mechanical load on the valve and to ease thread
alignment, but refer to local codes.
CAUTION: CHECK FUEL GAS TYPE!
The Bristol is factory equipped to use natural gas
(NG) and requires conversion for use with propane
(LP). You must purchase and install a propane (LP)
fuel conversion kit if required for your installation.
Use kit 97-56621. Contact your Hearthstone dealer.
Gas Supply
This 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 ½ psig. The Bristol 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 greater than ½ psig.
Gas Pressure Adjustment
NOTE: A QUALIFIED TECHNICIAN MUST
PERFORM THIS PROCEDURE!
Once connected to the gas supply, the supply line
and manifold gas pressures must be tested. The
supply line pressure is tested to ensure it meets the
minimum gas supply pressure as listed in the
specifications for the type of fuel in use (NG or LP).
Test by connecting a manometer to the supply line
and adjusting the incoming pressure if necessary to
meet the required supply line pressure as listed in
specifications. The manifold pressure tap on the gas
control valve, refer to
Figure 26
for location.
High Altitude Installations
For high altitude installations consult the local gas
distributer or the authority having jurisdiction for
proper rating methods.
The decreased atmospheric pressure at higher
altitudes affects the heat value of fuel gases. Gas
suppliers typically derate the gas intended for use at
elevations above 2000 feet (610 meters). Check with
your gas supplier before derating this appliance.
If the installer must convert the unit to adjust for
varying altitudes, the information sticker (
similar to
the one shown in Figure 28)
must be filled out by the
installer and adhered to the appliance at the time of
conversion.
For installations from 2000
– 4500
feet (610-1370 meters) use the Front/Rear orifice
sizes (DMS) 43/47 for NG and 55/59 for LP. See
the rating label for more information.
This appliance is factory equipped for use at 0-2000
feet (0-610 meters) altitude. (
Cet appareil est
equipe pour des altitudes compries entre 0 et
2000pieds (0-610m) seulment).
Figure 27 - Sample Information Sticker
