Operating instructions

50
MAINTENANCE
1. ANNUAL MAINTENANCE OF MENDOTA UNITS IS
REQUIRED. The following procedures must
be performed
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
B. The condition of any wiring under the burner for melting or
damage.
C. 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 34.
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. 45). Pilot must read a minimum of 460 millivolt. Be
sure all items in LIGHTING and INSTALLATION "check off " lists are completed (see PG. 44).
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 325
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 325 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 14 3).
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 14: 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 LESS THAN
2.8 ohms
D
AUTO/
PILOT
DROPOUT
1 & 2
OPEN BETWEEN
120-30 MV
2. 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) or comparable product. Do Not
use oven cleaner or abrasive cleaners to clean glass. DO
NOT CLEAN WHEN GLASS IS HOT.
3. PERIODIC VISUAL CHECK OF PILOT FLAMES IS REQUIRED.
4. PERIODIC VISUAL CHECK OF MAIN BURNER’S REAR AND FRONT FLAMES IS REQUIRED.
Figure 14: Millivolt Read-
Figure 13