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Innovative Hearth Products
BRT40ST See-Through B-Vent Gas Fireplaces
Gas Pressure - All Models
Tables 2 and 3 show the appliances' inlet and
manifold gas pressure requirements:
Inlet Gas Supply Pressure
Fuel #
Minimum
4.5" WC
Natural Gas
(1.12 kPa)
11.0" WC
Propane*
(2.74 kPa)
Table 2
Manifold Gas Supply Pressure
Fuel #
Low
Natural
2.2" WC
Gas
(0.55 kPa)
6.3" WC
Propane*
(1.57 kPa)
Table 3
Test gauge connections are provided on the
front of the millivolt gas control valve (identi-
fied IN for the inlet and OUT for the manifold
side). The control valves have a 3/8" (10mm)
NPT thread inlet and outlet side of the valve
(refer to Figure 1).
Propane tanks are at pressures that will cause
damage to valve components. Verify that the
tanks have step down regulators to reduce the
pressure to safe levels.
The appliance and its appliance main gas
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 psi (3.5 kPa).
The appliance must be isolated from the
gas supply piping system by closing its
equipment shutoff valve during any pressure
testing of the gas supply piping system at
test pressures equal to or less than 1/2 psi
(3.5 kPa).
6
Orifice Sizes - Sea Level to High Altitude
(All Models)
These appliances are tested and approved for
installation at elevations of 0-4500 feet (0-1372
meters) above sea level using the standard burner
Maximum
orifice sizes (marked with an "*" in Table 4). For
elevations above 4500 feet, contact your gas
10.5" WC
supplier or qualified service technician.
(2.62 kPa)
13.0" WC
Deration - At higher elevations, the amount
(3.24 kPa)
of BTU fuel value delivered must be reduced
by either:
*if field converted
• Using gas that has been derated by the gas
company.
• By changing the burner orifice to a smaller
size as regulated by the local authorities
High
having jurisdiction and by the (USA) National
3.5" WC
Fuel Gas Code NFPA 54/ANSI Z223.1 - latest
(0.87 kPa)
edition or, in Canada, the CAN/CGA-B149.1
codes - latest edition.
10.0" WC
(2.49 kPa)
Install the appliance according to the regulations
*if field converted
of the local authorities having jurisdiction and,
in the USA, the National Fuel Gas Code NFPA
54 / ANSI Z223.1 - latest edition or, in Canada,
the CAN/CGA-B149.1 - latest edition.
Flame breadth, height and width will diminish
4% for every 1,000 feet of altitude.
In Canada - CAN/CGA-2.17-M91 (R2009) (high
altitude): THE CONVERSION SHALL BE CAR-
RIED OUT BY A MANUFACTURER'S AUTHO-
RIZED REPRESENTATIVE, IN ACCORDANCE
WITH THE REQUIREMENTS OF THE MANU-
FACTURER, PROVINCIAL OR TERRITORIAL
AUTHORITIES HAVING JURISDICTION AND
IN ACCORDANCE WITH THE REQUIREMENTS
OF THE CAN/CGA-B149.1 OR CAN/CGA-B149.2
INSTALLATION CODES.
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
0-4500
(0-1372)
Table 4
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Natural
Propane
Gas
Gas**
drill size (inches)
drill size (inches)
#32 (0.116")
*
1.65mm (.065")
**
37L82 •
74L88 •
* Standard size installed at factory
**If field converted.
• Part /Cat. Number
General Information
900301-00 05/2016
Gas Valve Diagrams
See Figure 1 for Millivolt models.
HI/LO Variable
Inlet Pressure Tap
Flame Height
Manifold Pressure Tap
Adjustment
Main Gas Control Knob
Pilot Adjustment
OFF/PILOT/ON
Screw
Figure 1 -
SIT Millivolt Gas Valve
REQUIREMENTS FOR THE COMMON-
WEALTH OF MASSACHUSETTS
These appliances are approved for installation in
the US state of Massachusetts if the following
additional requirements are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations 248
C.M.R. Sections 4.00 through 8.00.
• Installation and repair must be done by a
plumber or gas fitter licensed in the Com-
monwealth of Massachusetts.
• The flexible gas line connector used shall
not exceed 36 inches (92 centimeters) in
length.
• The individual manual shut-off must be a
T-handle type valve.
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