Lennox International Inc. MPB35ST-NM - Manual (Page 4)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
4
WARNING
B-Vent appliances are not designed
to operate in negatively pressured
environments (pressure within
the home is less than pressures
outside). Signifi cant negatively
pressured environments caused
by weather, home design, or other
devices may impact the operation
of these appliances. Negative
pressures may result in poor fl ame
appearance, sooting, damage to
property and/or severe personal
injury. Do not operate these appli-
ances in negatively pressured
environments. Providing adequate
ventilation to the appliance for
combustion air will eliminate a
negative pressure environment.
HI
LO W HT
PT
HT
PT
PILO
T
PIL
O T
ON
it
OFF
IN OUT
Manifold Pressure Tap
Inlet Pressure Tap
SIT Millivolt Gas Valve
Pilot Adjustment
Screw
HI/LO Variable
Flame Height
Adjustment
Main Gas Control Knob
OFF/PILOT/ON
Figure 2
TPTH TP TH
Main Gas
Control Knob
OFF/PILOT/ON
HI/LO Variable
Flame Height
Adjustment
Gas
Outlet
Gas
Inlet
Terminals
TPTH,TP & TH
Note: The piezo igniter is located below
the valve (see Figure 1).
OPERATION AND CARE OF YOUR
APPLIANCE
The standard controls for appliance operation
are located behind the hinged drop-down panel
below the appliance front glass enclosure panel
(see Figure 1). Optional control switches are
also available (see Page 15 - Remote Wall
Switch or Remote Control).
Operation of millivolt and electronic gas con-
trol systems are different. Before lighting and
operating your appliance determine if you have
a millivolt or electronic appliance. Familiarize
yourself with the gas control valve that your
appliance uses. Refer to Figure 1 for access
to the gas control valve.
Millivolt Appliances - Appliances with
Millivolt systems will be fi tted with the gas
control valve shown in Figure 2.
Electronic Appliances - Appliances with
electronic systems will be fi tted with the
electronic valve shown in Figure 3.
Gas Control Compartment Access
The gas controls can be found behind the control compartment access panel.
To open the control compartment access panel, actuate the spring-loaded magnetic catches secur-
ing the panel. First, depress the outer top right corner of the panel until the catch "pops" the door
free. Then, gently pull the door forward until the left top corner "pops" free, allowing the panel to
swing out and down to open.
On millivolt systems, the piezo igniter, HI/LO fl ame adjustment knob, and pilot and main gas OFF/ON
control knob are located below the glass panel enclosure. The gas valve for electronic systems is
also located below the glass enclosure panel. See Figure 1.
To ease door closure, depress the catches to place them in their retracted position, then close the door.
Control
Compartment Access panel
Figure 1 - Gas Control Compartment Access
Note: The gas supply line must be installed in accordance with building codes by a qualifi ed
installer approved and/or licensed as required by the locality. In the Commonwealth of Massachu-
setts, installation must be performed by a licensed plumber or gas fi tter.
HI/LO (fl ame height
control knob)
OFF/PILOT/ON (gas control knob)
Gas Flex Line
Gas Valve
Piezo Igniter
OFF/ON Switch
Hinge Pin
WARNING
Carbon monoxide poisoning:
early signs of carbon monoxide
poisoning are similar to the fl u
with headaches, dizziness and/or
nausea. If you have these signs,
obtain fresh air immediately. Turn
off the gas supply to the appliance
and have it serviced by a quali-
fi ed professional, as it may not
be operating correctly.
WARNING
Any safety guard or screen
removed for servicing the appli-
ance must be replaced prior to
operating the appliance.
WARNING
Do not place clothing or other fl ammable materials on or near appliance.
Millivolt Appliances -
To light millivolt appliances refer to the detailed
lighting instructions found on Page 18 . Millivolt
appliance lighting instructions may also be
found on the pull out lighting instruction labels
attached to the gas control valve.