A.O. Smith VB/VW- 1000, VB/VW- 750 Relief Valve, Burner Maintenance, Combustion Air Filter

Any safety devices including low water cutoffs used in conjunction with this boiler should receive periodic (every six months) inspection to assure proper operation. A low water cutoff device of the float type should be flushed every six months. Periodic checks, at least twice a year, should be made for water leaks.

More frequent inspections may be necessary depending on water conditions.

The boiler-mounted gas and electrical controls have been designed to give both dependable service and long life. However, malfunction can occur, as with any piece of equipment. It is therefore recommended that all components be checked periodically by a qualified service agent for proper operation.

Relief Valve

The safety relief valve should be opened at least twice a year to check its working condition. This will aid in assuring proper pressure relief protection. Lift the lever at the top of the valve several times until the valve seats properly and operates freely.

or on the blower and motor. Buildups of dirt and lint on the blower and motor can create excessive loads on the motor resulting in higher that normal operating temperatures and possible shortened service life.

Burner Maintenance

Qualified servicers should follow this procedure when the boiler’s burner needs cleaning.

1.Turn off the electrical power to the boiler and close the main manual gas shutoff valve(s). Allow the boiler parts to cool before disassembly.

2.Loosen the flange and separate the gas train from the manifold assembly.

3.Separate the burner from the blower adapter by first removing the four (4) bolts and subsequently, the blower gaskets­. The blower should be free to move at this point.

FOR DIRECT VENT UNITS: It is necessary to loosen and slide the rubber coupling on the blower adaptor in order to move the blower.

4.Loosen the seven bolts on the blower adapter at the base and move the burner ground wire (Green) aside.

5.Lift the blower adapter and remove the manifold assembly up from the 6 studs located on the cover plate and remove the burner gasket.

6.Remove any loose foreign material such as dust or lint with a vacuum. Check all ports for blockage. Dislodge any foreign material causing blockage. Remove any soot or carbon deposits with a rag making sure to remove any lint left on the burner by vacuuming again.

7.Reverse the steps to reassemble the unit.

8.Restore electrical power and gas supply to the boiler.

•Put the boiler back in operation by following the Lighting and

Operating instructions in this manual.

•Check for gas leaks and proper boiler and vent operation.

Combustion Air Filter

If the combustion air supply to the boiler contains dust, dirt, drywall dust etc. a filter must be installed. An air filter is not supplied with the boiler as shipped from the factory. The installer must provide a filtering system in the air inlet to the boiler if dust, dirt or construction dirt can be pulled into the boiler through the inlet air piping. Periodically clean air filter per the manufacturer’s instructions.

Blower Compartment

The blower compartment should be cleaned annually to remove any dirt and lint that may have accumulated in the compartment

Condensate Removal System

Due to the highly efficient operation of this unit, condensate is formed during operation and must be removed by the conden­ sate drain systems. Inspect the condensate drains and tubes at least once a month and insure they will allow the free flow of condensate at all times. The system must be inspected more frequently in cold weather if the drain system is located in an area, such as along the floor, where freezing temperatures­ are likely to occur. The conden­sate drain system must be protected against freezing. Contact a qualified service agent to inspect and correct the condition if freezing of the conden­sate lines is a problem. The unit is equipped with a blocked flue switch which will shut the unit off if condensate is unable to drain and backs up in the unit. A blocked flue error will appear when sufficient condensate accumulates for this condition.

The transparent drain lines and condensate drain on the bottom of the vent collector should be visually inspected at one month intervals for blockage, particularly in the areas of the loops in the lines which trap a small amount of conden­sate, and the exit point of the vent collector drain. Conden­sate in portions of the line other than the loop area indicates a blockage in the drain line. Flush the

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