Lochinvar 90, 500 Check All Wiring, Check Control Settings, Perform Start-upand Checks, Notice

Installation & Service Manual

8Maintenance (continued)

Check All Wiring

1.Inspect all wiring, making sure wires are in good condition and securely attached.

Check Control Settings

1.Adjust settings if necessary. See Section 5 - Electrical Connections for adjustment procedures.

2.Check settings of external limit controls (if any) and adjust if necessary.

Perform Start-up and Checks

1.Start appliance and perform checks and tests specified in Section 6 - Start-up.

2.Verify cold fill pressure is correct and that operating pressure does not go too high.

Check Burner Flame

Visually check main burner flames at each start-up after long shutdown periods or at least every six months. A burner viewport is located on the burner mounting flange.

￿WARNING The area around the burner and burner viewport is hot. Direct contact could

result in burns.

Figure 8-1_Flame Pattern Illustration

NORMAL YELLOW TIP

Combustion Air Adjustment

This appliance uses an atmospheric combustion process. Combustion air is provided to the burners by the gas injection pressure into the venturi of the burners. The burners do not have an adjustable air shutter. Adequate combustion air must be supplied to the room where the appliance is installed to ensure proper burner operation. Check frequently to be sure the flow of combustion and ventilation air to the unit is not obstructed. When the main burners light, observe the burner flame. Flames should be light blue in color with slight yellow tips; flames should be settled on burner head with no lifting when supplied with correct volume of combustion air.

Check Flue Gas Passageways

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 procedure must only be performed by a qualified serviceman or installer. Proper service is required to maintain safe operation. Properly installed and adjusted appliances seldom need flue cleaning.

NOTICE	All gaskets on disassembled components
	must be replaced with new gaskets on
	reassembly. Gasket kits are available from
	your distributor.

A

C

YELLOW FLAME

B

D

FLAME LIFT

Normal Flame: A normal flame is blue, with slight yellow tips, with a well defined inner cone and no flame lifting.

Yellow Tip: Yellow tip can be caused by blockage or partial obstruction of air flow to the burner(s).

Yellow Flames: Yellow flames can be caused by blockage of primary air flow to the burner(s) or excessive gas input. This condition MUST be corrected immediately.

Lifting Flames: Lifting flames can be caused by over firing the burner(s) or excessive primary air.

If improper flame is observed, examine the venting system, ensure proper gas supply and adequate supply of combustion and ventilation air.

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