Lochinvar 497 - 2067 service manual Maintenance

8 Maintenance

Listed below are items that must be checked to ensure safe, reliable operations. Verify proper installation 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.

Figure 8-1_Flame patterns

WARNING: The area around the burners is hot and direct contact could result in burns!

Installation & Service Manual

Flue gas passageways cleaning procedure

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.

All gaskets on disassembled components must NOTICE 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

NORMAL

A

C

YELLOW FLAME

YELLOW TIP

B

D

FLAME LIFT

	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

WARNING The areas around the burner viewports are hot. Direct contact with the unit could

result in burns.

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.

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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