Low Gas Pressure Switch:
Bring boiler to high fire (100% firing rate)
Increase the dial on the low gas pressure switch until it trips and locks out the boiler
Make note of the pressure that the burner shuts down at
Once the gas switch trips, set the pressure switch to 50% lower than the value that the switch
tripped at – Example: gas switch trips at 10 in. w.c., set the switch to 5 in. w.c.
Reset the switch and flame programmer
Cycle the burner and observe for proper operation
High Gas Pressure Switch:
Bring boiler to low fire (0% firing rate)
Decrease the dial on the high gas pressure switch until it trips and locks out the boiler
Make note of the pressure that the burner shuts down at
Once the switch trips, set the pressure switch to 50% higher than the value that the switch tripped
at – Example: gas switch trips at 10 in. w.c., set the switch to 15 in. w.c.
Reset the switch and flame programmer
Cycle the burner and observe for proper operation
Proof of Closure:
Disconnect power to the boiler
While the boiler is off, remove the common wire to the proof of closure switch and install a wire
nut on the end of switch or wrap in tape to properly protect the wire.
Turn power to the boiler back on
The boiler should immediately lock out on alarm due to the POC being disconnected.
Disconnect power and reconnect the POC wire
Turn power to the boiler back on and reset any flame programmer faults
Cycle the burner and observe for proper operation
Flashback Protection:
Locate the flashback protection device and change the setting to the lowest setting. This is
typically 32 deg. F.
o To change the setting, the “Set/Reset” button must be pressed as the wheel is rotated
The device will generate an alarm
Reset the device to the factory temperature setting. This is typically 750 deg. F for standard
steam units.
Try to turn on the burner. It should not work as the reset button on the control has not yet been
pressed.
Press the reset button on the controller. The boiler should now operate correctly.
To Next Page
Loading...
