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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 build-up around the control. Inspect the condition
of any wiring under the burner for melting 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 con-
tacted.
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 a millivolt meter
and cycle the burner per LIGHTING INSTRUCTIONS (see Pg. 19).
COMBUSTION SYSTEM MILLIVOLT READING
2.
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 operation. Readings must be taken with:
A. PILOT ONLY OPERATING - Thermostat "OFF" - Minimum Millivolts 450
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 450 millivolts with the Pilot Light operating,
Thermostat turned "OFF" and Main Burner "OFF". To increase or decrease millivolts, (and pilot flame) ad-
just pilot screw on control. (See below)
B. MAIN BURNER OPERATING - Rocker Switch "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", Rocker Switch "ON" and Main Burner operating.
CHECK
TO TEST
CONNECT
TEST
METER
LEADS TO
TERMINALS
COMPLETE
A
2 & 3
SYSTEM
THERMO-
B
1 & 2
PILE
OUTPUT
SYSTEM
C
1 & 3
RESISTANCE
AUTO/
D
1 & 2
PILOT
DROPOUT
3. THE VIEWING GLASS SHOULD BE CLEANED PERIODICALLY. Exterior glass may be cleaned with
cleaner as desired. Interior glass - use KEL KEM "Polish Plus", part # 65-06-00455.
WARNING: NEVER CLEAN GLASS WHEN UNIT IS HOT. DO NOT USE ABRASIVE CLEANERS. BREAKAGE AND SCRATCHES
MAY RESULT.
MAINTENANCE
THERMOSTAT
METER
CONTACTS
READING
SHOULD BE
CLOSED
100MV OR
MORE
OPEN
GREATER
THAN
450 MV
CLOSED
LESS THAN
80 MV
OPEN
BETWEEN
120-30 MV
:
a.] Pilot ONLY operating.
Figure 19: Millivolt Read-
FIGURE 19: Millivolt Readings
30
FIGURE 18
b.] Main Burner operating.
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