HearthStone Quality Home Heating Products Inc
STERLING Ht Gas-Fired Direct Vent heater
to loosen the bolt. Sliding the control levers forward
or backward will open and close the shutters. This
nut is hot and should not be touched. Use only metal
tools for this adjustment. Sliding forw ard opens the
air shutter, and sliding ba ckward closes it. Tighten
the nut after making adjust ment. The air shutter is
factory set and only a qualified gas technician should
make adjustments.
(refer to the image below to see a
typical flame pattern)
P
ILOT
A
DJUSTMENT
The pilot light is preset by the manufacturer and
should not need adjustment. The pilo t light flame
must be large enough t o engulf the th ermopile and
thermocouple located next to the pil ot, but not so
large as to create excessive noise or consume
excessive gas.
(refer to the image below)
However, it
can be adjusted by means of the pilot light adjustment
screw located on the gas control valve. Access the
gas control valve as described in the Gas Connections
section, on page 16. Note that the pilot flam e must
engulf the t hermopile so that the th ermopile can
generate sufficient m illi-voltage (325 t o 500-mv) to
power the millivolt gas control valve.
W
ARNING
!
The control has an interl ock device. If
the stove has been lit, it will no
t relight
immediately. After shutting off all gas flow, the
pilot burner cannot be relit until the thermocouple
has cooled, allowing th e electromagnet to be
released
(Approx. 60 sec.)
. The gas control knob is
designed to operate by hand. Do not use any tools
during this operation.
G
AS
C
ONVERSIONS
All Sterling stoves are set up for use with Natural
Gas when built. However, these uni ts are easily
converted for use with LP, and visa versa. Th e
instructions provided wit h the included conversion
kit must be followed.
Only a Qualified Gas
Technician should do the conversion.
For checking, and pr operly adjusting, the manifold
pressure, refer to the
Gas Connection section on page
16
of this manual.
Leak test before, and after, lighting the stove
.
Fill out the label provided on back of the stove. The
input rate of the heater is verified by checking the
manifold pressure. If the manifold pressure is
correct, then the input rate is also correct. Be sure to
check the ma nifold pressure and properly adjust the
pilot and main burner flames.
HIGH ALTITUDE CONVERSIONS
For high altitude installations, (610-1370 meters,
2000-4500 feet) the orifice sizes (DMS) for NG gas
is 52 & 39 for 4”x6” pipe and 44 & 53 for 5”x8”
pipe. For LP gas, the orifice sizes are 54 & 64 for
4”x6” pipe and 56 & 64 for 5”x8” pipe. See data
plate for additional information. For high altitudes
consult the local gas distributor, or the authority
having jurisdiction for proper rating methods. If a
conversion is necessary, the installer must fill out the
conversion label provided with the kit and place it on
the unit.
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