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Key to Layouts
+ BB - Components on board burners
+ BQ - Components on board main panel
+ BC - Components on board boller
DISC1 - Disconnect switch motor
DISC2 - Disconnect switch auxiliary
FU1 - Motor fuse
FU2 - Auxiliary fuse
HL - High limit control
LAL - Control box
LT2 - Remote lock-out signal
LT3 - Low fire signal
LT4 - High fire signal
LT5 - Power on signal
LT6 - Limit satisfied
MC - Motor contactor
MTR - Fan motor
OC - Operating control
OCR - High-low control
OL1 - Thermal overload
PS - Remote lock-out reset
PSCR - Photocell
PB - Switch: burner off - on;
- Switch: low and high fire operation
SOL1 - Low fire solenoid valve
SOL2 - High fire solenoid valve
SOLS - Safety solenoid valve
T1 - Ignition transformer
TB1 - Burner terminal strip
TB2 - Burner ground (earth) connection
W1 - Cable fan motor
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