Mendota GREENBRIAR M-50, Installation & Operating Instruction Manual

Page: 51 / 68

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HI/LO REGULATOR
INLET PRESSURE TAB
MANIFOLD PRESSURE TAB
ON/OFF GAS CONTROL KNOB
THERMOPILE THERMOSTAT
THERMOPILE
THERMOSTAT
PILOT ADJ. SCREW
PILOT GAS LINE
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 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. Be sure logs are re-installed per instructions on PAGE 34.
C. Check condition of gaskets, gaskets must be tight, replace if necessary.
D. Periodically check to verify that the vent system and vent cap are open
and free of blockage.
E. Before re-installing glass, have qualified service person check the opera-
tion of the pilot with millivolt meter and cycle the burner per LIGHTING
INSTRUCTIONS (see PG. 43). 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 37). Pilot Flame must be a minimum of ¾” long on all three branches.
C.
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 37:
).
1. 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.
2. Periodic visual check of pilot flames is required .
3. Periodic visual check of main burner’s rear and front
flames is required.
CHECK
TEST
TO TEST CONNE
CT
METER
LEADS
TO
TERMI
NALS
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
Figure 37: Millivolt Readings