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Gas Pressure - All Models
Tables 3 and 4 show the units' gas pressure
requirements:
Inlet Gas Supply Pressure
(all models)
Fuel #
Minimum
5.0" WC
Natural Gas
(1.24 kPa)
11.0" WC
Propane
(2.74 kPa)
Table 3
Manifold Gas Supply Pressure
(all models)
Fuel #
Low
(millivolt only)
Natural
(Lo) 2.2" WC
Gas
(0.55 kPa)
(Lo) 6.3" WC
Propane
(1.57 kPa)
Table 4
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. A 1/8" NPT Test gauge connection
is provided at the inlet and outlet side of
the electronic gas control valve.
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).
4
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 orifice sizes (marked with an "*" in Table
5). For elevations above 4500 feet, contact your
gas supplier or qualified service technician.
Maximum
10.5" WC
Deration - At higher elevations, the amount
(2.62 kPa)
of BTU fuel value delivered must be reduced
by either:
13.0" WC
• Using gas that has been derated by the gas
(3.24 kPa)
company.
• Changing the burner orifice to a smaller size
as regulated by the local authorities having
jurisdiction and by the (USA) National Fuel
Gas Code NFPA 54/ANSI Z223.1 - latest
edition or, in Canada, the CAN/CGA-B149.1
codes - latest edition.
High
Install the appliance according to the regulations
of the local authorities having jurisdiction and,
in the USA, the National Fuel Gas Code NFPA
(Hi) 3.5" WC
54 / ANSI Z223.1 - latest edition or, in Canada,
(0.87 kPa)
the CAN/CGA-B149.1 - latest edition.
(Hi) 10.0" WC
(2.49 kPa)
NOTE: Flame appearance will diminish 4% per
thousand feet.
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.
Elevation 0-4500 feet ( 0-1372 meters)
Model
Series
MPB35ST-B
Table 5
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
0 - 4500
(0-1372)
* Standard size installed at factory
Table 8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Burner Orifice Sizes
Nat.Gas
Propane
drill size (inches)
drill size (inches)
#37 (.104") *
1.55 mm (.061") *
24M10 •
42M79 •
* Standard size installed at factory
• Part /Cat. Number
Natural
Propane
Gas
Gas
drill size (inches)
drill size (inches)
#37 *
1.55
mm *
(.104")
(.061")
Gas Valve Diagrams
See Figure 1 for Millivolt models and Figure 2
For Electronic Models.
HI/LO Variable
Inlet Pressure Tap
Flame Height
Adjustment
Manifold Pressure Tap
Main Gas
Pilot Adjustment
Control Knob
Screw
OFF/PILOT/ON
Figure 1 -
SIT Millivolt Gas Valve
Manifold Pressure
ON / OFF Switch
Port
Electronic Gas
Control Valve
Figure
2 - Honeywell Electronic Gas Valve
REQUIREMENTS FOR THE COMMON-
WEALTH OF MASSACHUSETTS
Installation of these fireplaces are approved
for installation in the US state of Massachu-
setts if the following additional requirements
are met:
• Install this appliance in accordance with
Massachusetts Rules and Regulations 248
C.M.R. Sec. 5.08 2(a) through 2(e).
• 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.
Inlet
Pressure
Port
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