5.Local codes may require a back flow preventer or actual disconnect from city water supply when glycol antifreeze is added to the system.
WATER TREATMENT
In hard water areas, water treatment should be used to reduce the introduction of minerals to the system. Minerals in the water can collect in the heat exchanger tubes and cause noise on operation. Excessive build up of minerals in the heat exchanger can cause a
MAINTENANCE
Listed below are items that must be checked to ensure safe reliable operation. Verify proper operation after servicing.
CAUTION
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
1.Examine the venting system at least once a year. Check more often in the first year to determine inspection interval. Check all joints and pipe connections for tightness, corrosion or deterioration. Clean louvers and/or screens in the combustion air intake system as required. Have the entire system, including the venting system, periodically inspected by a qualified service agency.
2.Visually check main burner flames at each start up after long shutdown periods or at least every six months.
WARNING: The area around the burners is hot and direct contact could result in burns!
FIG. 37 Burner Flames
a.Normal Flame: A normal flame is blue, with slight yellow tips, with a well defined inner cone and no flame lifting.
b.Yellow Tip: Yellow tip can be caused by blockage or partial obstruction of air flow to the burner(s).
c.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.
d.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.
3.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.
4.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 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.
All gaskets on disassembled components must be replaced with new gaskets on reassembly. Gasket kits are available from your distributor.
29
