Description Of Functions Of Operating Controls - Fireye BurnerPRO BP110 Series Manual

DESCRIPTION OF FUNCTIONS OF OPERATING CONTROLS

1. Limit Switches: These are generally pressure, water level or temperature activated. There are two types
which are:
a. Recycle - when it is desired to start the burner or a call for heat is present, the limit switch closes causing
the burner start-up sequence to begin. When it is desired to stop the burner or the setpoint has been satis-
fied, the limit switch opens causing the burner to stop. The recycle limit is connected between terminal 4
and 5.
b. Non-Recycle/Lockout -when it is necessary to stop the burner when the limit switch opens and prevent it
from starting until both the limit switch recloses and the manual reset is activated. The non-recycle limit is
connected between terminals 4 and 14.
2. Proof of Closure Interlock: This is generally an integral switch mounted on the main fuel valve and acti-
vated by the valve stem. It is connected between Terminal 4 & 12 when burner is idle. The POC switch
interlock prevents a burner start-up if the valve stem is not in the "valve closed" position. This interlock
must remain closed while in STANDBY and until the start of PTFI.
3. Purge Interlock: Generally a firing rate motor linkage position switch or a differential air-pressure switch,
that proves a maximum purge air flow rate. It is connected between Terminals 8 and 9. The purge interlock
proves that the air damper is fully open and purge air flow rate is at maximum during the purge.
3. Running Interlocks: These generally are high and low fuel pressure switches, oil temperature switches,
atomizing media pressure switches, and excess smoke density controls. These interlocks prove proper con-
ditions for normal operation of the burner.
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