Maintenance And Servicing; Maintenance Checklist; Glass Maintenance - Lennox Hearth Products Medina Merit Series Installation And Operation Manual

Maintenance and Servicing

Maintenance Checklist

The following should only be performed by a qualified
service technician.
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
1. Annual inspection should be made and the following
checks performed:
oWhen unit is cool, remove glass and inspect burner for
dirt, soot and lint accumulations and remove if necessary.
If excessive soot accumulation is present on burner, have
a qualified service technician adjust the burner for proper
combustion.
o C lean inside of glass with gas fireplace glass cleaner.
NEVER attempt to remove or clean the glass when the
unit is hot.
o C heck the hot air outlet vents for lint or other accumula-
tions. Never block or restrict vent openings, obstruct flow
of ventilation air, or use vents other than those approved
for use with the Medina gas insert.
o C heck that the chimney and its outlet are open and free
of soot, blockage, or debris.
o C heck gaskets once a year. Gaskets must be tight. Replace
if necessary.
o I nspect the pilot system for proper flame. NEVER ADJUST
THE PILOT until after the gas pressure has been checked
and the supply lines have been completely bled (this may
take an hour or more when bleeding through the pilot).
All pilots are checked and burned at the factory prior to
shipment. The pilot adjustment screw is located below the
ON/OFF/PILOT control knob. Remove the pilot adjusting
cover with a flat-bladed screwdriver to access the pilot
adjusting screw. Adjust the pilot screw to properly size the
flames. The flames should directly contact the thermopile
and extend across the main burner ports. Be careful not
to back the screw out of its threads. Replace the cover
and check for gas leaks using a gas leak test solution.
o C heck that the area around the insert is kept clear and is
free of combustible materials, gasoline and other flam-
mable vapors and liquids.
o C heck the millivolt system as per the table on this
page.
. The viewing glass should be cleaned periodically (see

Glass Maintenance).

Check
Test
A
B
C
Figure 19
Glass Door Cleaning and Maintenance
Cleaning: When cool, the glass may be cleaned with a clean,
soft cloth and Windex. For cleaning white condensation from
the interior glass, use KEL KEM gas fireplace glass cleaner
available from your insert dealer. Use of caustic or abrasive
cleaners may damage the glass. DO NOT operate the insert
with broken glass. DO NOT clean door or glass when hot. DO
NOT abuse the glass door by striking or slamming it shut.
DO NOT use substitute materials if replacing the glass. DO
NOT spray commercial glass cleaner with ammonia on the
door and glass gasket as it may dissolve the gasket glue.
Glass Replacement: The glass in the insert door cannot be
replaced separately. Should the glass be damaged, the entire
glass, gasket and metal frame assembly must be replaced
as a unit. This replacement glass assembly is available from
your Lennox Hearth Products dealer. The glass is neo-ceramic
and alternative types must not be used.
WARNING: Do not operate appliance with the glass panel
removed, cracked, or broken. Do not remove glass door
while the insert is hot. Replacement of the glass door
should be done by a qualified service technician.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Millivolt and System Checks
To Connect Thermostat
Test Meter Connects
Leads to
Terminals
Complete  & 3
System
Thermopile 1 & 
Output
System  & 3
Resistance
P P F a
roPer ilot laMe PPearance
Meter
Reading
Should Be
Closed 100 MV
or More
Open Greater
Than
35 MV
Closed .5 Ohms
17