Laars NeoTherm NTH Installation And Operation Instructions Manual - page 31
NeoTherm Boiler
Page 31
1/16 of a revolution increments until the CO
2
is
within the range identified.
3.
Measure the CO
2
/O
2
in the flue products at low
fire. NeoTherm can be forced to low fire to allow
for easier setup. Refer to
Section 5.2.3
for
instructions on how to access the forced rate menu.
CO
2
readings should be between the values shown
in
Table 13
. If the CO
2
is not within the range
shown, adjustments may be made. To adjust the
low fire CO
2
, locate the low fire adjuster screw
according to the appropriate figure. Slowly make
adjustments in 1/16 of a revolution increments
until the CO
2
is within the range identified.
4.
Repeat steps 2 and 3 to confirm that the CO
2
ranges are within the required ranges. Adjust if
necessary.
5.
Confirm that the differential pressure is still within
the appropriate range.
6.
If any of the measurements cannot be adjusted to
the specified ranges or the CO levels are above
150ppm when adjusted please consult the factory
Figure 25B. NeoTherm Gas Valves (600, 750 and 850).
600
750, 850
for further information.
7.
Remove the differential pressure gauge from the
air and gas pressure taps making sure to close all
ports after the gauge has been removed.
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.
6.3 Shutting Down NeoTherm
1.
Turn off the main electrical disconnect switch.
2.
Close all manual gas valves.
3.
If freezing is anticipated, drain NeoTherm and be
sure to also protect building piping from freezing.
All water must be removed from heat exchanger or
damage from freezing may occur.
This step to be performed by a qualified service person.
6.4 To Restart NeoTherm
If drained, follow
Section 6.1
in this manual for
proper filling and purging.
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.
Burner will go through a prepurge period and
ignitor warm-up period, followed by ignition.
SECTION 7.
Maintenance
WARNING
Disconnect all power to the appliance before
attempting any service to the appliance. Contact with
electricity can result in severe injury or death.
7.1 System Maintenance (Yearly)
1.
Lubricate the system water-circulating pump, if
required, per the instructions on the pump.
2.
If a strainer is employed in a pressure reducing
valve or the piping, clean it every six months.
3.
Inspect the venting system for obstruction or
leakage at least once a year. Periodically clean the
screens in the vent terminal and combustion air
terminal (when used).
4.
Keep the appliance area clear and free from
combustible materials, gasoline, and other
flammable vapors and liquids.