Cleaning And Maintenance - Lochinvar 399 Installation And Service Manual

Hydronic Heating Boilers and
Domestic Water Heaters
CLEANING AND
MAINTENANCE
Listed below are items that must be checked to ensure safe
reliable operations. Verify proper operation after servicing.
CAUTION: Label all wires prior to
disconnection when servicing controls. Wiring
errors can cause improper and dangerous
operation.
Appliance Area
Keep appliance area clear and free from combustible materials,
gasoline and other flammable vapors and liquids.
Water Circulating Pump
Inspect pump every six months and oil as necessary. Use SAE
30 non-detergent oil or lubricant specified by pump
manufacturer.
Burner Flames
Visually check main burner flames at each start up after long
shutdown periods or at least every six months. Burner
viewports are located on the right and left sides of the unit.
FIG. 55 Flame Pattern Illustration
Normal Flame: A normal flame is blue with slight yellow tips,
has a well-defined inner cone, and displays no lifting flames.
Yellow Tips: The usual causes for yellow tips on the burner
flame are burner air flow blockage or partial obstruction.
Yellow Flames: The usual causes for yellow flames are
primary air flow blockage to the burner(s) or excessive gas
input. Correct this condition immediately.
Lifting Flames: The usual causes for lifting flames are over
firing the burner(s), excessive primary air, or high draft.
If you observe improper flame patterns, examine the venting
system, ensure proper gas supply, and ensure adequate supply
of combustion and ventilation air.
Flue Gas Passageways Cleaning
Procedures
Any sign of soot around the outer jacket, at the burners or in
the areas between the fins on the copper heat exchanger
indicates a need for cleaning. The following cleaning
procedures must only be performed by a qualified serviceman
or installer. Proper service is required to maintain safe
operation. Properly installed and adjusted units seldom need
flue cleaning.
IMPORTANT: All gaskets on disassembled
components must be replaced with new gaskets
on reassembly. Gasket kits are available from
your distributor.
Burner Removal and Cleaning
1. Turn off main power to unit.
2. Turn off main manual gas shutoff to unit.
3. Remove the front outer jacket panels.
4. Disconnect manifold from gas train using union(s) just
below each gas valve(s).
5. Remove mounting screws from manifold mounting
brackets. Pull the manifold/orifice assembly away from
burners. Repeat for each manifold assembly.
6. Remove two mounting screws from burner and slide
burner out toward front of unit. Use caution to prevent
damage to burners, refractory, hot surface igniter or wiring.
7. Remove soot from burners with a stiff bristle brush. Dirt
may be removed from burner ports by rinsing the burner
thoroughly with water. Drain and dry burners before re-
installing. Damaged burners must be replaced.
When installed in a dusty and dirty location, the burners may
require cleaning on a 3 to 6 month schedule or as needed,
based on severity of contamination. Contaminants can be
drawn in with the combustion air. Non-combustible particulate
matter such as dust, dirt, concrete dust or dry wall dust can
block burner ports and cause non-warrantable failure. The
standard inlet air filter will help eliminate dust and dirt from
entering the unit. Use extreme care when operating a unit for
temporary heat during new construction. The burners could
require a thorough cleaning before the unit is placed in service.
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