LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 24)

LAARS Heating Systems
Page 24
Plug
SECTION 4.
Maintenance
4.1 General Instructions
1. Oil the water circulating pump in accordance
with the manufacturer's instructions.
2. If a strainer is used in a pressure reducing valve
or in the piping, clean it every 6 months in
accordance with the manufacturer's instructions.
3. At startup and every 6 months after, check the
main burner flame. If the flame has the
appearance of sooting tips, check for debris near
orifices. Call service technician.
(see Figure 35). Perform this inspection after 60
days of and after 120 days of operation. This will
establish a regular inspection routine.
3. Reinstall both plugs after inspection.
4.2.2 Cleaning the Heat Exchanger
An inspection and cleaning of the complete heat
exchanger can only be done by removing it from the
boiler.
1. Remove the heat exchanger.
WARNING
Black carbon soot buildup on a dirty heat exchanger
can be ignited by a random spark or flame. To
prevent this happening, dampen the soot deposits
with a wet brush or fine water spray before
servicing the heat exchanger. Ignition of soot can
possibly cause serious injury or burns, and in
extreme cases, death.
MISE EN GARDE
L’accumulation de suie noire ou de saleté sur
l’échangeur thermique peut s’enflammer par le
contact d’une étincelle ou d’une flamme. Humidifier
les dépôts de suie à l’aide d’une brosse mouillée ou
d’une vaporisation d’eau avant d’effectuer
l’entretien de l’échangeur thermique afin
d’empêcher que cela se produise. L’embrasement
de la suie peut occasionner des blessures graves,
de brûlures et même, dans les cas extrêmes, la
mort.
2. Remove the heat baffles and check for a light
accumulation of soot or corrosion on the outside
of the heat exchanger tubes.
NOTE: While the heat exchanger is out of the boiler,
inspect the firewall insulation blankets for wear and
tear. Replace if necessary.
3. Use a wire brush to remove soot and loose scale
from the heat exchanger. Do not use water or
compressed air for cleaning.
Figure 35. Scale Inspection.
4. Inspect the venting system for blockage, leakage,
and corrosion at least once a year.
5. Keep the boiler area clear of combustible
material, gasoline, and other flammable liquids
and vapors.
6. Be sure all combustion air and ventilation
openings are not blocked.
7. Check for black carbon soot buildup on the
external surfaces of the heat exchanger every 6
months.
8. Do not use the boiler if any part has been under
water. Replace anypart of the control system and
any gas control which has been under water.
NOTE: After installation and first startup, check the
heat exchanger for black carbon soot buildup after the
following periods of operation: 24 hours, 7 days, 30
days, 90 days, and once every 6 months thereafter.
4.2 HEAT EXCHANGER
4.2.1 Inspecting the Heat Exchanger
To check the scale buildup, periodically inspect
the tube having the highest temperature as follows:
1. Remove the ¼ inch, NPT plug located on the left
side of the boiler.
2. Remove the large, hex-head plug located on the
right side of the boiler under the in/out header
Figure 34. Flame Patterns.
OUT OF
PRODUCTION