BRAHMA G22 CONTROL BOX
Installation directions
The controllers are safety devices; guarantee and responsibility of the
manufacturer will be debarred if the products are tempered with by the
user.
Make sure that a regulation shutdown occurs every 24 hours to allow
the controller self-checking its efficiency (non permanent operation
systems).
The controller must be connected and disconnected without power
supply.
The controller can be mounted in any position.
Avoid exposure to dripping water.
A ventilated installation ambient and a quite low temperature ensure
the longest life of the controller
Before installing or replacing the controller make sure that its type,
code and times are those required.
Checking at start
Before any ignition attempt make sure that the combustion chamber is
free from oil, then make sure that:
if the starting attempt occurs with the flame detector obscured the con-
troller performs a lockout at the end of safety time;
if start up attempt occurs with extraneous light, the controller proceeds
to lockout within the time equivalent to safety time (only in versions
where this option is available) ;
when the flame detector is obscured in running position the oil valve(s)
is/are de-energized within 1 second, and the controller goes to lockout
after a recycle;
The intervention of regulators, limiters or safety devices causes a shut
down of the controller according to the application type;
Operating times and cycle are in compliance with the ones declared
for the used controller type.
Operation
Once the thermostats are closed, the controller energizes the burner
motor; in this phase the device proceeds to a self-checking process of the
flame detection and safety circuit. At the end of pre-purge time the output
of the first oil valve is powered. If flame is detected, at the end of safety
time, the controller de-energizes the ignition transformer and goes to run-
ning position. At the end of safety time, in the double stage controllers, the
ignition transformer is de-energized and, contemporaneously, the output
of the second oil valve is energized. If no flame is detected within safety
time, at the end of the same the controller proceeds to lockout and so the
valve, ignition transformer and motor are de-energized, and the lockout
signal is activated. The following cycle diagrams are useful to better
understand the operation of the single controllers.
Abnormal operations
220V and 110V G22 controller:
an extraneous light or a fault in the
amplifier which corresponds to the flame condition leads to a continuous
pre-purge condition
220V and 110V GF2 controller:
an extraneous light or a fault in the
amplifier which corresponds to the flame condition causes the controller
to lockout in the time equivalent to safety time.
All controllers with 24V and 12V:
an extraneous light or a fault in the
amplifier which corresponds to the flame condition causes the controller
to lockout in the time equivalent to safety time.
Controller Reset
When the controller has gone to lock-out a 10 second interval should be
allowed before attempting to reset it; if this interval is not allowed, the con-
troller may not be reset.
Flame Signal Test
It’s extremely important to test the flame signal level before starting up the
burner or in case of a maintenance operation. To effect this test it’s
enough to have a multimeter and, while the burner is in the running state,
to measure the voltage between terminal 9 and the neutral one which
must be lower than 0.5V dc, as shown in the next picture. This value gua-
rantees a sufficient safety margin, it corresponds to a double light inten-
sity comparing with the minimum value (the limit value is about 0,8V). in
case the value of the measured voltage is higher, try to better orientate
the photocell or to clean it.
Connection diagram
G22 OR1 (SINGLE FLAME)
GF2 OR2 (DOUBLE FLAME)
Cycle diagram
G22 OR1
GF2 OR2-3
APPENDIX
Terminal no. 9
Neutral terminal
V
V< 0,5V DC