Lennox International Inc. MPB35ST-NM - Manual (Page 5)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 5
Millivolt appliances are fi tted with an OFF/ON
Rocker Switch located behind the control
compartment access panel, below the appli-
ance front glass enclosure panel (see Figure 1
for location). Once the pilot is lit, the OFF/ON
rocker switch will control the appliance OFF/ON
burner operation. To operate: Toggle the switch
between its ON and OFF positions.
If your millivolt appliance is equipped with an
optional remote switch kit (wall switch or remote
control) and the pilot is lit, the appliance main
burner may be turned on and off using the
optional switch. When using an optional remote
switch, turn off the standard OFF/ON switch.
Note: To prevent excessive resistance in burner
circuit (which can cause burner operation prob-
lems), only one burner control switch should be
wired to valve. Therefore, if an optional control
switch is installed, the standard Off/On switch
and wires should be removed.
Electronic Appliances -
To light electronic appliances refer to the
detailed lighting instructions found on Pagex
19. Electronic appliance lighting instructions
may also be found on the pull out lighting instruc-
tion labels attached to the gas control valve.
Once the pilot is lit, if your electronic appliance
is equipped with an optional burner control
switch kit the appliance main burner may be
turned on and off using the optional switch
(See Optional Accessories on Pagex 15 - wall
switch, or remote control Receiver).
Figure 3
Honeywell Electronic Gas Valve
F
F
O
NI
P
S
I
N
O
L
O R T
N O
C
GI N
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ER
Manifold
Pressure
Port
ON / OFF Switch
Inlet
Pressure
Port
Electronic Gas
Control Valve
2. During the fi rst initial burns of these appli-
ances, there will be some odor emitted (see
Burn-In Period on Page 3 ).
3. Keep the lower control compartment clean
by vacuuming or brushing at least twice a
year. More frequent cleaning may be required
due to excessive lint from carpeting, bedding
materials, pet hair, etc. It is very important
that the control compartments, burners
and circulating air passageways of the
appliance are kept clean.
4. Always turn off gas to the pilot (millivolt
appliances) and let the appliance cool down
before cleaning. Before re-lighting, refer
to the lighting instructions in this manual.
Lighting instructions may also be found
on the pull out lighting instruction labels
attached to the gas control valve.
5. Always keep the appliance area clear and
free from combustible materials, gasoline
and other fl ammable liquids.
6. Remember, Millivolt appliances have a con-
tinuous burning pilot fl ame. Exercise cau-
tion when using products with combustible
vapors.
VENT OPERATION TEST
A vent operation test is required as part of the
installation to verify that proper venting condi-
tions exist and should be done periodically to
ensure nothing has changed that would affect
proper venting of the appliance.
Procedure:
1. ENSURE APPLIANCE IS OFF (PILOT ONLY)
AND COOL.
2. Open both latches on one of the glass
enclosure doors and slightly prop it open at
the bottom (approx. 1/4” gap). See Figure
6 on Page 9.
3. Turn on all the exhaust fans in the dwelling
(and any other appliances which remove
air from the dwelling, such as a furnace or
clothes dryer, etc.).
4. Ensure that all the doors and windows in
the room where the fi replace is located are
closed.
5. Light the appliance (see Lighting Instruc-
tions, Pages 18 & 19 ). Adjust fl ame
height to highest setting and operate for
approximately 5-10 minutes. Do not leave
appliance unattended.
6. Take a smoke producing device and move it
along the bottom edge of the glass door (where
it is cracked open). If smoke is drawn into the
fi rebox, the vent operation is adequate.
IF THE SMOKE IS NOT DRAWN INTO
THE FIREBOX, TURN THE APPLIANCE
OFF AND CALL A QUALIFIED SERVICE
TECHNICIAN.
Variable Flame Height Adjustment
( Millivolt Appliances only)
1. All Millivolt appliances are equipped with a
variable gas control valve. Flame height for
these models may be adjusted through a
range between fi xed low and high settings
while the appliance is in operation. Adjust
the fl ame height as desired after lighting the
appliance by rotating the variable adjustment
control knob (HI/LO) located on the front of
the valve (refer to Figure 2 ).
SPILL SWITCH OPERATION
Manual-Reset (safety limit) Spill Switch
This appliance is equipped with a (safety limit)
spill switch that is designed to "trip" and discon-
nect the burner circuit if fl ue spillage occurs
(because of improper venting of combustion
products or vent blockage). If, during appliance
operation, the burner fl ame goes out (indepen-
dently of the burner OFF/ON wall switch), it may
be due to the operation of this (safety limit) spill
switch. If this switch "trips" it will need to be
manually reset by pressing the reset button on
switch (see Figure 4 ).
Procedure to Reset (safety limit) Spill Switch
ALLOW APPLIANCE TO COOL COMPLETELY
BEFORE ACCESSING AND RESETTING
To access the spill switch:
1. Pull off the top louvered panel.
2. Locate and press the red reset button on
the switch (it will click & lock in).
The appliance should then relight and remain
lit. If this does not occur, turn off the appliance
and call a qualifi ed service technician.
Press Reset Button on
Spill Switch
Remove Top
Louvered
Panel (or
optional
radiant panel,
if applicable)
Figure 4 - Spill Switch