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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
- Flame sensor
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
19
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