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

LAARS Heating Systems
Page 12
Top View
View On
Arrow A
Burner
C/L 4th Port
A
Observation Hole Burner
3C. To Turn Off Boiler
1. Turn off main electrical switch.
2. Close all manual gas valves.
3D. To Shut Down System
To shut down boiler, turn off all manual gas
valves and electrical disconnect switch. Whenever
danger of freezing exists, shut off water supply and
remove drain plug in bottom of front header cover and
drain every part of system subject to freezing
temperatures.
SECTION 4.
Maintenance
1. If a strainer is employed in a pressure reducing
valve or in the piping, clean it every six (6)
months.
2. At start-up and every six (6) months thereafter,
the pilot and main burner flame should be
observed for proper performance (see Figure 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.
3. Inspect the venting system for obstruction,
leakage, and corrosion at least once a year.
4. Keep boiler area clear and free from combustible
material, gasoline and other flammable liquids
and vapors. Boiler surfaces are hot and could
ignite combustible material.
5. Be certain all combustion air and ventilation
openings are unobstructed.
6. 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
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.
Pilot (P/N W0034500)
Figure 10. Pilot Location. Figure 11. Periodic Flame Observation.
Front View of Boiler