33
MAINTENANCE
1.
ANNUAL MAINTENANCE OF MENDOTA UNITS IS REQUIRED
. The following procedures must be per-
formed each year by a Mendota approved service person. NOTE: Any adjustments to burner, pilot or logs must be
done by a qualified Mendota service person.
A.
Clean all lint and dust built-up around the control. Inspect the condition of any wiring under the burner for melt-
ing or damage.
B. Remove logs & coals and clean away any foreign matter (lint, carbon, etc.) on the burner and logs. Be sure the
burner ports are "open". Clean the pilot and under side of the logs for any carbon deposits. NOTE: Logs should
be visually checked for carbon "build-up". If carbon deposits are visible on logs, unit should be turned off and
Mendota service person contacted. Be sure logs are re-installed per instructions on page
Error! Bookmark not
defined.
.
C. Make sure hot air outlet grills are free from lint and other obstructions. Never block or obstruct grill openings.
Check condition of gaskets, gaskets must be tight, replace if necessary.
D. Check that chimney flue and outlet are open and free of blockage.
E.
Before re-installing glass, have qualified service person check the operation of the pilot with millivolt meter and
cycle the burner per LIGHTING INSTRUCTIONS (see pg. 27). Pilot must read a minimum of 250 millivolts. Be
sure all items in LIGHTING and INSTALLATION "check off " lists are completed (see pg. 24).
F.
Before re-installing glass, have qualified service person check for door gasket condition and proper seal. If gasket
is deteriorated or does not seal properly, replace door gasket.
2.
COMBUSTION SYSTEM MILLIVOLT READING:
Millivolt readings must be taken by a qualified installer at the time of installation and after any interruption in burner
operation. These readings will establish proper thermopile millivolt generation and assure trouble-free burner opera-
tion. Readings must be taken with: a.) Pilot ONLY operating.
b.) Main Burner operating.
A.
PILOT ONLY OPERATING -
Thermostat "OFF" - Minimum Millivolts 250
Using a Millivolt Meter, a millivolt reading should be taken by attaching Meter leads to terminals #1 and #2 on
the main gas valve. The Meter must read a minimum of 250 millivolts with the Pilot Light operating, Thermo-stat
turned "OFF" and Main Burner "OFF". To increase or decrease millivolts, (and pilot flame) adjust pilot screw on
control (see
Figure 8
).
B.
MAIN BURNER OPERATING -
Thermostat "ON" - Minimum Millivolts 100
Using a Millivolt Meter a millivolt reading should be taken by attaching Meter leads to terminals #2 and #3 on the
millivolt panel on the main gas valve. The Meter must read a minimum of 100 millivolts with the Gas Cock Dial
turned “ON”, Thermostat "ON" and Main Burner operating. To increase or decrease millivolts (and pilot flame)
adjust pilot screw on control (see
Figure 8: Millivolt Readings
).
CHECK
TEST
TO TEST
CONNECT
METER
LEADS TO
TERMINALS
THERMOSTAT
CONTACTS
METER
READING
SHOULD BE
A
COMPLETE
SYSTEM
2 & 3
CLOSED 100MV
OR
MORE
B
THERMO-
PILE
OUTPUT
1 & 2
OPEN GREATER
THAN
325 MV
C
SYSTEM
RESISTANCE
1 & 3
CLOSED 2.75
OHMs
MAX
D
AUTO/
PILOT
DROPOUT
1 & 2
OPEN BETWEEN
120-30 MV
3.
THE VIEWING GLASS SHOULD BE CLEANED
PERIODICALLY.
Exterior glass may be cleaned with cleaner as desired. Interior glass - use KEL KEM "Polish
Plus" or comparable product. Do Not use oven cleaner or abrasive cleaners to clean glass. DO NOT CLEAN WHEN
GLASS IS HOT.
4.
PERIODIC VISUAL CHECK OF BURNER AND PILOT FLAMES IS REQUIRED
.
Figure 8: Millivolt Readings
