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LENNOX HEARTH PRODUCTS • MERIT
TEST ALL CONNECTIONS FOR GAS LEAKS
(FACTORY AND FIELD):
WARNING
Never use an open flame to
check for leaks.
Turn on gas supply and test for gas leaks, us-
ing a gas leak test solution (also referred to as
bubble leak solution).
Note: Using a soapy water solution is an
effective leak test solution but it is not recom-
mended, because the soap residue that is left
on the pipes/fittings can result in corrosion
over time. Never use an open flame to check
for leaks.
A. Light the appliance (refer to the lighting
instructions label in the control compartment
or in the Care and Operation Instructions
manual).
B. Brush all joints and connections with the
gas leak test solution to check for leaks. If
bubbles are formed, or gas odor is detected,
turn the gas control knob to the "OFF" posi-
tion. Either tighten or refasten the leaking
connection and retest as described above.
C. When the gas lines are tested and leak free, be
sure to rinse off the leak testing solution.
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
Step 7. VERIFYING APPLIANCE
OPERATION
Turn on burner then 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.
With gas line installed run initial system
checkout before closing up the front of the unit.
Follow the pilot lighting instructions provided
in the Care and Operation Instructions. For
piezo igniter location see Figure 39 on Page
26 (millivolt appliances only).
Note: Lighting Instructions are also found on
the literature tag tied to the gas piping next to
the gas valve. To access the tag, open the lower
control compartment door (Figure 39 on Page
26) by pulling the panel forward.
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 lighting of the appliance
will not require such purging. Inspect the pilot
flame (remove contemporary floor media, if
necessary, handling carefully).
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" minimum (tip)
of the quick drop out thermocouple should be
engulfed in the pilot flame.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
The flame should project 1" (25 mm) beyond
the hood at all three ports (see Figure 41).
Replace contemporary floor media if removed
for pilot inspection.
To light the burner; turn "ON" the remote wall
switch and rotate the gas valve control knob
counterclockwise to the "ON" position ("ON"
will be at the top side of the valve).
MILLIVOLT
Hood
Igniter Rod
Thermocouple
Pilot
Nozzels
Thermopile
Figure 41
Electronic Appliance Checkout
To light the burner, turn 'ON' the unit mounted
On/Off switch or the optional remote wall switch.
Ensure the igniter lights the pilot. The pilot
flame should engulf the flame rod as shown
in Figure 42.
ELECTRONIC
Sensor
Igniter
Figure 42
3/8" Min
(9 mm)
Pilot
Hood
27
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