Install Instructions

Page 47
NEOTHERM Residential Boilers
and turn on the gas and main electrical power (circuit
breaker) to the unit.
4. Turn the NeoTherm on at the On/Off switch.
5. The NeoTherm unit will begin the start sequence.
The blower and pump will energize for the pre-purge
period, then the ignition sequence will start. After all
safety devices have been veried, the gas valve will
open. If ignition doesn’t occur, turn off the NeoTherm,
and check that there is proper gas supply. Wait 5
minutes before restarting.
6. After placing the appliance in operation, the Burner
Safety Shutoff Device must be tested:
• Close the gas shutoff valve with the burner operating.
• The ame will go out and the blower will
continue to run for the post purge cycle. One
or three additional attempts to light will follow.
Each cycle will include pre-purge, ignitor on,
valve/ame on, and post purge. Ignition will
not occur because the gas is off. The ignition
control will lockout after a single try or a third try
depending on the controller model.
• Open the gas shutoff valve. Reset the boiler
control by pressing the Reset button on the
control or on the display. Restart the appliance.
The ignition sequence will start again and the
burner will start. The appliance will return to its
previous mode of operation.
DANGER
If you detect any odor of gas, or if the gas burner
does not appear to be functioning in a normal
manner, CLOSE THE MAIN SHUTOFF VALVE.
Do not shut off the switch. Contact your heating
contractor, gas company, or factory representative.
9.3 RestartingtheNeoThermUnit
If the unit has been drained, see Section 9.1 in this manual
for instructions on lling and purging the unit properly.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. WAIT FIVE (5) MINUTES.
4. Set the aquastat or thermostat to its lowest setting.
5. Open all manual gas valves.
6. Reset all safety switches (pressure switch, manual reset
high limit, etc.).
7. Set the temperature controller to the desired
temperature setting, and switch on electrical power.
8. The burner will go through a prepurge period, followed
by ignition.
9.4 ShuttingDowntheNeoThermUnit
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If you think the NeoTherm unit might freeze, drain it.
All water must be removed from the heat exchanger,
or damage from freezing may occur. Also be sure to
protect the piping in the building from freezing.
Caution
This step must be performed by a qualied service
technician.