Step 7. Checking Operation; Step 8. Install Grate, Vermiculite; Embers & Logs - Lennox MPD35ST-NM-B Installation Instructions Manual

Merit plus series direct vent gas fireplace heaters
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Step 7. CHECKING APPLIANCE OPERA-
TION
With the gas line installed, run initial system
checkout before closing up the front of the
appliance. Follow the pilot lighting instructions
provided in the Care and Operation Instructions.
For piezo igniter location see Figure 49 (millivolt
appliances only).
Note: The (pull-out) Lighting instructions label
can be found in the control compartment
(see Figure 49).
When first lighting the appliance, it will take
a few minutes for the line to purge itself of
air. Once purging is complete, the pilot and
burner will light and operate as indicated in
the instruction manual. Subsequent lightings
of the appliance will not require such purging.
Inspect the pilot flame.
Millivolt Appliance Checkout
The pilot flame should be steady, not lifting
or floating. Flame should be blue in color with
traces of orange at the outer edge.
The top 3/8" (10 mm) at the pilot generator
(thermopile) and the top 1/8" min (tip) of the
quick drop out thermocouple should be engulfed
in the pilot flame. The flame should project 1"
(25 mm) beyond the hood at all three ports
(Figure 50).
To light the burner; rotate the gas valve control
knob counterclockwise to the "ON" position
then turn "ON" the OFF/ON switch (installed
at Step 4).
Observe the individual tongues of flame on
the burner. Make sure all ports are open and
producing flame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
28
Proper Pilot Flame Appearance
Thermocouple
Igniter Rod
/8" Min.
Hood
(3 mm)
Pilot
Nozzels
Thermopile
Figure 50
Electronic Appliance Checkout
To light the burner, turn 'ON' the OFF/ON switch
(located in the control compartment). Ensure the
igniter lights the pilot. The pilot flame should
engulf the flame rod as shown in Figure 51.
Observe the individual tongues of flame on
the burner. Make sure all ports are open and
producing flame evenly across the burner. If
any ports are blocked, or partially blocked,
clean out the ports.
ELECTRONIC
Proper Flame
(9 -3 mm)
Adjustment
Pilot
Nozzels
Figure 51
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

Step 8. INSTALL GRATE, VERMICULITE,

GLOWING EMBERS AND LOGS
WARNING: DO NOT attempt to
install the logs until the appli-
ance installation has been
completed, the gas line con-
3/8" Min.
(9 mm)
nected and tested for leaks and
the initial burner operation has
been checked out.
WARNING: Logs get very hot
and will remain hot up to one
hour after gas supply is turned
off. Handle only when logs are
cool. Turn off all electricity to
the appliance before you install
grate and logs.
WARNING: This appliance is
not designed to burn wood. Any
attempt to do so could cause
irreparable damage to the appli-
ance and prove hazardous to
your safety.
3/8" to /2"
WARNING:
installed according to the log
installation instructions, flame
Ground
impingement and improper
Electrode
combustion could occur and
Flame Rod
result in soot and/or excessive
production of carbon monoxide
Hot Surface
(CO), a colorless, odorless,
Igniter
toxic gas.
If logs are not

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