LAARS Mighty Therm AP (Sizes 2000-5000) - Installation, Operation and Maintenance Instructions - Manual (Page 12)

Page 12
LAARS Heating Systems
SECTION 4.
Maintenance
1. At start-up and every six (6) months thereafter,
the pilot and main burner flame should be
observed for proper performance (see Figures 9
and 10; see attached lighting and shutdown
instructions for proper pilot flame pattern). If
flame has the appearance of “sooting” tips, check
for debris near orifices. Call service technician.
with a flashlight by locating a mirror under the
burners. An alternate method is to remove the venting
and top panel as necessary to inspect from above.
Also, check the vent system for defects at the same time.
a. If cleaning is required, shut off all electrical
and gas supply to the boiler.
b. To expose the heat exchanger:
Remove top panel covers located at the
base of the front and rear flue collector
panels. Remove all but the top screws on
each side of the front and rear flue collector
panels. The panels can be swung outward
and propped up to reveal the heat
exchanger. Remove all heat exchanger
baffles.
c. Remove all burners:
Caution
Black carbon or green soot on a dirty heat
exchanger can, under certain conditions, be
ignited by a random spark or open flame. To
prevent this unlikely occurrence, dampen the
soot deposits with a wet brush or fine water
spray before servicing or cleaning the heat
exchanger.
With a wire brush, remove soot and loose scale
from the heat exchanger. Do not use water or
compressed air for cleaning. Clean fallen debris from
the bottom of the boiler. Check that burner ports are
clear and pilot assembly is free of debris.
d. Reassemble in reverse order:
Be sure to replace the heat exchanger
baffles.
6. The gas and electric controls installed on the
boilers are designed for both dependable
operation and long life. But the safety of this
equipment depends completely on their proper
functioning. It is strongly recommended that the
basic items be checked by a competent service
technician every year, and replaced when
necessary. The basic controls are:
a. Water temperature controls.
b. Pilot safety system.
c. Automatic electric gas valve(s).
d. Water pressure switch.
e. Flow sensing safety device (when used).
7. Low water cutoffs should be inspected every six
(6) months, including flushing or float types.
NOTE: Warranty does not cover any damage
caused by lack of required maintenance or improper
operating practices.
Figure 9. Pilot Location.
Figure 10. Periodic Flame Observation.
2. Inspect the venting system for obstruction,
leakage, and corrosion at least once a year.
3. Keep boiler area clear and free from combustible
material, gasoline and other flammable liquids
and vapors. Boiler surfaces are hot and could
ignite combustible materials.
4. Be certain all combustion air and ventilation
openings are unobstructed.
5. Check for fouling on the external surfaces of the
heat exchanger every six months.
NOTE: After installation and first start-up,
check the heat exchanger for fouling after the
following periods of operation: 24 hours, 7 days, 30
days, 90 days, and once every six months thereafter.
Fouling on the external surfaces of the heat
exchanger is caused by incomplete combustion, and is
a sign of combustion air and/or venting problems. As
soon as any fouling is observed, the cause of the
fouling should be corrected (see Section 5
Troubleshooting). The heat exchanger can be checked