Hearthstone
Quality
Home
Heating
Products ,
Inc.
ODEL
8521
Sterling
“G”
B-Vent
9
Gas Supply
F
ACTORY
-R
EADY FOR
G
AS
O
PERATION
All Sterlings are shipped from the manufacturer
fully assembled and ready for natural gas or LP
(liquid propane) gas operation with minor
adjustment. However, if the Sterling needs to be
converted from natural gas to LP or from LP to
natural gas, conversion of the unit must be
performed by qualified service personnel using the
manufacturer-supplied optional conversion kit.
Follow the conversion instructions supplied with the
conversion kit.
"For installations from 2,000-4,500 ft. (610-
1370m), the orifice sizes (DMS) for natural and
propane gas are 45 and 56 respectively. See data
plate for additional information. For high altitude
installations, consult the local gas distributor or the
authority having jurisdiction for proper rating
methods. If the installer must convert the unit to
adjust for varying altitudes, the information sticker
must be filled out by the installer and adhered to the
appliance at the time of conversion.
The conversion shall be carried out by a
manufacturer’s authorized representative in
accordance with the requirements of the
manufacturer, provincial or territorial
authorities having jurisdiction and in
accordance with the requirement of the
CAN/CGA 2.17 Installation Codes.
Gas Connection
The gas supply line connection is made to the
Sterling's gas control valve just inside the right rear
leg of the unit using a d" 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.
The unit must be installed and connected in
accordance with local codes, or in absence of local
codes, with the most current edition of the
National
Fuel Gas Code ANSI Z223.1 CAN/CGA B149.
The supply line must include a manual shut-off valve
and union so that the unit can be disconnected for
servicing. Also, a sediment trap must be installed
upstream of the heater. The sediment trap is
installed to prevent moisture and contaminants from
passing through the pipe to the heater controls. A
1/8" N.P.T. plugged tapping is recommended for
ease of pressure and gauge connection tests.
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
(natural
gas or LP)
, by connecting a manometer to the
supply line and adjusting the incoming pressure if
necessary to meet the required supply line pressure
