7
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Millivolt Models - BTU Input
Millivolt models come standard with the
manually-modulated gas valve; flame appear-
ance and heat output can be controlled at the
gas valve. Input of for these models is shown
in Table 1.
Electronic Models -
Electronic models have a fixed rate gas valve.
Input of electronic models is shown in Table
2.
Gas Pressure -

Tables 3 and 4 show the appliances' gas

pressure requirements.

Inlet Gas Supply Pressure
(all models)
Fuel # Minimum Maximum
Natural Gas 5.0" WC
(1.24 kPa)
10.5" WC
(2.61 kPa)
Propane 11.0" WC
(2.74 kPa)
13.0" WC
(3.23 kPa)
Table 3
Input (BTU) - Fixed Rate
(electronic models)
Models Fuel
Type
Input Rate
(BTU / HR)
MPB35ST-NE-B Nat. Gas 30,000
MPB35ST-PE-B
(if field converted)
Pro. Gas 28,000
Table 2
Manifold Gas Supply Pressure
(all models)
Fuel # Low
(millivolt only)
High
Natural
Gas
(Lo) 2.2" WC
(.55 kPa)
(Hi) 3.5" WC
(.87 kPa)
Propane (Lo) 6.3" WC
(1.57 kPa)
(Hi) 10.0" WC
(2.49 kPa)
Table 4
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models Fuel
Type
Input Rate
(BTU / HR)
MPB35ST-NM-B Nat. Gas 30,000 high
23,000 low
MPB35ST-PM-B Propane 28,000 high
22,000 low
Table 1
Test gauge connections are provided on the front
of the millivolt gas control valve, identified IN
for the inlet and OUT for the manifold side (see
Figure 2 on Page 9). A 1/8" NPT Test gauge con-
nection is provided at the inlet and outlet side of
the electronic gas control valve (see Figure 3
on Page 9).
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.
Deration - At higher elevations, the amount
of BTU fuel value delivered must be reduced
by either:
• Using gas that has been derated by the gas
company.
• Changing the burner orice 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/CSA-B149.1
codes - latest edition.
Install the appliance according to the regulations
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/CSA-B149.1 - latest edition.
NOTE: Flame appearance will diminish 4% per
thousand feet.
These appliances must be isolated from the gas supply piping system (by closing their individual manual shut-off valve) during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).These appliances and their individual shut-off valves must be disconnected from the gas supply piping system dur-ing any pressure testing of that system at pressures greater than 1/2 psig (3.5 kPa).
Burner Orifice Sizes (all models)
Elevation
Feet (meters)
Natural
Gas
drill size (inches)
Propane
Gas
drill size (inches)
0-4500
(0-1372) #37 (.104") *
24M10•
1.55
mm
(.061")*
42M79•
Table 5 * Standard size installed at factory
• Part /Cat. Number
Burn-in Period
During the first few fires of this appliance there
will be some odor due to the curing of the
paint and burning off of lubricants used in the
manufacturing process. Depending on your
use, the burn-in period may take a few hours
or a few days.
KEEP YOU R HOUS E WELL VENTI LATED
DURING THE CURING PROCESS. THE ODOR
AND HAZE EMITTED DURING THE CURING
PROCESS CAN BE QUITE NOTICEABLE AND
MAY SET OFF A SMOKE DETECTOR.
A white film may develop on the glass front
during the first few fires as part of the curing
process. The glass should be kept clean during
the first two weeks of use to prevent the film from
baking on (making it very difficult to remove).
See Cleaning Glass on Page 11.