Lennox Hearth VIS35 - Manual (Page 22)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Maintenance and Servicing
m
aintenanCe
C
heCklist
:
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:
o When unit is cool, open glass viewing door and inspect
burner for dirt, soot, and lint accumulations, and removeif
necessary. If excessive soot accumulation is present on
burner, have a qualified service technician adjust
burner for proper combustion.
o Clean inside of glass viewing door with gas fireplace
glass cleaner. NEVER attempt to open door or clean
glass when unit is hot.
o Check the hot air outlet vents for lint or other accumula-
tions. Never block or restrict vent openings or obstruct
flow of ventilation air.
o Check that direct vent pipe, air intake, and flue are open
and free of soot, blockage, or debris.
o Check gaskets once a year. Gaskets must be tight. Replace
if necessary.
o Inspect the pilot system for proper flame. NEVER ADJUST
THE PILOT until after the gas pressure has been checked
and 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 to the
lower left of the flame height control knob.
.2 Adjust the pilot screw to properly size the flames. The
flames should completely surround the thermopile
and thermocouple and extend across the main burner
tube ports. Be careful not to back the screw out of its
threads.
o Check that the area around the stove is kept clear and
is free of combustible materials, gasoline, and other
flammable vapors and liquids.
o Check the millivolt system as per the table on this
page.
p
roper
p
ilot
f
lame
a
ppearanCe
Figure 5
Millivolt and System Checks
Check
Test
To
Test
Connect
Meter
Leads to
Terminals
Thermostat
Connects
Meter
Reading
Should Be
A Complete
System
& Closed 100 MV
or More
B Thermopile
Output
1 & Open Greater
Than
5 MV
C System
Resistance
& Closed .5 Ohms
See Figure 4 - Wiring Terminals
. The viewing glass should be cleaned periodically (see
Glass Door Cleaning & Maintenance).
. Should repairs or maintenance of the stove require
the disassembly of the vent/air intake system, the
reassembly and resealing should be completed by a
qualified service technician and follow the instructions
on page 11 of this manual.