Lennox MPB35ST-NM-B Care And Operation Instructions Manual page 7

The Installation must conform to local codes
or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1/NFPA
54-latest edition, or the Natural Gas and Propane
Installation Code, CAN/CGA-B149.1-latest edi-
tion. The appliance, when installed, must be
electrically grounded in accordance with local
codes or, in the absence of local codes, the
latest edition of the National Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical Code,
CSA C22.1 - latest editions.
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.
Input (BTU) Manually-Modulated Gas
Valves (millivolt models)
Models Fuel
Type
MPB35ST-NM-B Nat. Gas
MPB35ST-PM-B Propane
Table 1
Electronic Models -
Electronic models have a fixed rate gas valve.
Input of electronic models is shown in Table
2.
Input (BTU) - Fixed Rate
(electronic models)
Models Fuel
Type
MPB35ST-NE-B Nat. Gas
MPB35ST-PE-B Pro. Gas
(if field converted)
Table 2
Gas Pressure -
Tables 3 and 4 show the appliances' 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
Fuel #
Natural
Gas
Propane
Table 4
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).
The appliance and its appliance main gas
valve must be disconnected from the gas
Input Rate supply piping system during any pressure
testing of that system at test pressures in
(BTU / HR)
excess of 1/2 psi (3.5 kPa).
30,000 high
23,000 low
The appliance must be isolated from the gas
supply piping system by closing its equipment
28,000 high
shutoff valve during any pressure testing of
22,000 low
the gas supply piping system at test pres-
sures equal to or less than 1/2 psi (3.5 kPa).
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.
Input Rate
(BTU / HR)
Deration - At higher elevations, the amount
of BTU fuel value delivered must be reduced
30,000
by either:
• Using gas that has been derated by the gas
company.
28,000
• 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.
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/CGA-B149.1 - latest edition.
Maximum
Flame breadth, height and width will diminish
10.5" WC
4% for every 1,000 feet of altitude.
(2.62 kPa)
13.0" WC
(3.24 kPa)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
(all models)
Low High
(millivolt only)
(Lo) 2.2" WC (Hi) 3.5" WC
(.55 kPa) (.87 kPa)
(Lo) 6.3" WC (Hi) 10.0" WC
(1.57 kPa) (2.49 kPa)
Burner Orifice Sizes (all models)
Natural
Elevation
Gas
Feet (meters)
drill size (inches)
0-4500
#37 (.104") *
(0-1372)
24M10 •
* Standard size installed at factory
Table 5
• Part /Cat. Number
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.
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 YOUR HOUSE WELL VENTILATED
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.
Propane
Gas
drill size (inches)
1.55 mm (.061") *
42M79 •
7