Lighting Instructions - Burnham Series 5B Installation, Operating And Service Instructions

9.
THERMOCOUPLE CONTROL SYSTEM (Canada
Only)
The 5006B thru 5014B boilers are equipped with
a Thermocouple Control System that utilizes a
constant-burning Q327A pilot, a Q309 thermocouple,
and a L62GB-3C Pilot Safety Switch. The Q309
thermocouple proves pilot flame and, in the absence
of such, will cool and, within 45 to 90 seconds, will
cause the L62GB-3C Pilot Safety Switch to which it is
connected, to break the electrical circuit to the main gas
valves as well as shut off the flow of gas to the pilot.
Thus, 100% shut-off is achieved.
The 5015B thru 5024B boilers utilize two
Thermocouple Control Systems that are interconnected
electrically thru all operating and safety controls.
Should any of the aforementioned controls break the
power supply circuit, both Thermocouple Control
Systems would be de-energized. The proceeding
paragraph describes the function and operation of each
Thermocouple Control System. Should a pilot failure
on one Thermocouple Control System occur, the other
Thermocouple Control System would not be affected.
Thus main burners on the unaffected side would ignite
on a "call for heat" and would continue to operate until
the operating control was satisfied.
SecTiON iV - OPeRATiON (continued)
a. LIGHTING INSTRUCTIONS
(1) Make sure that all main manual and pilot valves
have been off for at least five (5) minutes.
(2) Set operating and limit controls to desired
setting.
(3) Open pilot valve.
(4) Depress button on pilot safety switch to which
it is connected and hold lighted match on pilot.
Hold button in for at least one minute, or until
the pilot burner remains lit after the button is
released. Repeat for second pilot when boiler is
so equipped.
(5) Open manual main shut-off valve(s).
(6) Turn on main electric switch.
NORMAL OPERATION SEQUENCE
5006B thru 5014B, see Fig. 46
5015B thru 5024B, see Fig. 47
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