Mendota GREENBRIAR M-50, Installation & Operating Instruction Manual

Page: 55 / 68

- 55 -
HI/LO REGULATOR
INLET PRESSURE TAB
MANIFOLD PRESSURE TAB
ON/OFF GAS CONTROL KNOB
PILOT ADJ. SCREW
PILOT GAS LINE TH TP #1
TP #2
TH #3
WARNING
DO NOT PROCEED WITH OPERATION OF THIS FIREPLACE
UNLESS BURNER "CYCLES" ON/OFF WITHOUT DELAYS!
COMBUSTION SYSTEM MILLIVOLT READING
Millivolt readings must be taken by a qualified installer once the LPG conversion kit parts have been installed.
These readings will establish proper thermopile millivolt generation and assure trouble-free burner operation. Read-
ings 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.
B. MAIN BURNER OPERATING - Thermostat "ON" - Minimum Millivolts 100
Using a Millivolt Meter a millivolt reading should be taken by attaching Me-
ter leads to terminals #2 and #3 on the mil-
livolt panel on the main gas valve. The Me-
ter must read a minimum of 100 millivolts
with the Gas Cock Dial turned “ON”, Ther-
mostat "ON" and Main Burner operating.
To increase or decrease millivolts (and pilot
flame) adjust pilot screw on control (see
Figure 37: Millivolt
Readings
).
CHECKING FOR NORMAL BURNER (S) IGNITION CHARACTERISTICS
Once the conversion to LPG and all the above steps have been completed, light the main burners.
Turn Gas Dial counterclockwise to "ON" then set Thermostat or push Main Burner ON/OFF switch to turn on burners.
Main burner should now light IMMEDIATELY and flame should not "lift" off burner. If there is any delay in ignition or if
flame is "lifting off" burner, turn off burner and carefully check for proper installation of logs/coals, vent system and proper
pilot flame impingement on burner and thermopile. Logs or coals must not block pilot flame or main burner flame. Vent
system must be leak proof.
Figure 42: 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