LAARS NeoTherm LC NTV1700 - Install and Operating Manual - Manual (Page 93)

NeoTherm LC Boilers and Water Heaters Page 89
Caution
If any odor of gas is detected, or if the gas burner
does not appear to be functioning in a normal
manner, close the main gas shutoff valve.
Do not shut off the power switch. Contact your
heating contractor, gas company, or factory
representative.
10.2.2 Combustion Setup Procedure
See the detailed instructions in Section 9.
WARNING
Improper adjustment may lead to poor
combustion quality, increasing the amount of
carbon monoxide produced. Excessive carbon
monoxide levels may lead to personal injury or
death.
10.3 Shutting Down the NeoTherm LC
This step must be performed by a qualified
service person.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If freezing is anticipated, drain the NeoTherm
LC and be sure to also protect the building
piping from freezing. All water must be
removed from the heat exchanger or damage
from freezing may occur.
10.4 Restarting the NeoTherm LC
If the system has been drained, see Section 10.1 for
instructions on proper filling and purging.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. Wait five 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 the electrical
power.
8. Each burner will go through a prepurge period
and ignitor warm-up period, followed by
ignition.
10.2 Initial Operation
The initial setup must be checked before the unit is
put into operation. Problems such as failure to start,
rough ignition, strong exhaust odors, etc. can be due
to improper setup. Damage to the boiler resulting
from improper setup is not covered by the limited
warranty.
10.2.1 Initial Burner Operation
1. Using this manual, make sure the installation
is complete and in full compliance with the
instructions and all local codes.
2. Determine that the unit and system are filled
with water and all air has been bled from both.
Open all valves.
3. Observe all warnings on the Operating
Instructions label and turn on gas and electrical
power to the unit.
4. The NeoTherm LC will enter the start
sequence. The blower and pump will energize
for pre-purge, then the ignition sequence will
start. After all safety devices are verified, the
gas valve will open. If ignition doesn’t occur,
turn off the NeoTherm LC. Check that there
is proper supply of gas. Wait five minutes and
start the unit again.
5. If ignition starts normally, leave the NeoTherm
LC turned on.
6. After placing the unit in operation, the Burner
Safety Shutoff Device must be tested:
(a) Close the gas shutoff valve with the
burner operating.
(b) The flame will go out, and the blower will
continue to run for the post purge cycle.
A few additional attempts to light will
follow including pre-purge, ignitor on,
valve/flame on and post purge. Ignition
will not occur because the gas is turned
off. The ignition control will lockout.
(c) Open the gas shutoff valve. Reset the
boiler control by pressing the Reset
button on the control. Restart the
appliance. The ignition sequence will
start again and the burner will start. The
appliance will return to its previous mode
of operation.