HearthStone
Quality Home Heating Products
MODEL Sterling “G” Direct-Vent
19
Gas supply
N
OTICE
A
qualified technician
must connect the heater to the gas supply and leak test the stove before it is approved for use.
Consult all local code.
W
ARNING
The stove must be installed and connected in accordance with local codes, or in the absence of local codes, with the
current edition of the National Fuel Code ANSI Z223.1
!
CAN/CGA B149 Installation Code.
High Altitude Adjustments
For high altitude installations consult the local gas distributor or the authority having jurisdiction for proper rating
methods. If the stove must be adjusted, the information sticker on page 6 (provided with the high altitude kit) must be
filled out completely and mounted to the stove per the instructions provided with the kit. This stove must be installed
in accordances with CAN/CGA 2.17 installation codes.
All the Sterlings are shipped from the manufacturer fully assembled and ready for natural gas operation with minor
adjustment. However, if the Sterling needs to be converted from natural gas to LP, conversion of the stove must be
performed by qualified service personnel using the manufacturer-supplied optional conversion kit. Follow the
conversion instructions supplied with conversion kit.
Gas Connection
The gas supply line connection is made to the Sterling’s gas control valve using a
d
" male N.P.T. fitting.
The supply line should be ½ "diameter pipe or tubing. We recommend a flexible line to avoid undue
mechanical load on the valve and to ease thread alignment.
The supply line must include a manual shut-off valve and union so that the unit can be disconnected for
servicing. The gas control valve has built in pressure taps for test gauge connections. Install a sediment trap
as close to the inlet as practical (per National Gas Code).
Gas Pressure Adjustment
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). Connect a manometer to
the supply line and adjust the incoming
pressure if necessary to meet the
required supply line pressure as listed in
the Specifications. The manifold outlet
pressure is tested by connecting the
manometer to the manifold pressure tap
on the Gas Control Valve
The stove 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 (3.5 kPa). The Sterling 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 (3.5
kPa).
3" MIN.
Cap
Nipple
To Equipment
Inlet
Tee Fitting
Gas Supply
Inlet
Sediment Trap
