Installation / Operation Instruction Manual

Maintenance continued-

3. Sediment (Annual, but harsh water quality may dictate

more frequent service) – Depending on water conditions, a

varying amount of sediment may collect in the tank. Levels

requiring service are indicated by a small temperature

difference in the supply and return lines (See also “Scale”

below). Repeated flushing usually clears such material. As a

preventive measure, water should be drawn from the tank at

the drain valve until it runs clear.

4. Scale (Annual) – Hard water may cause scale to build-up on

the outside of the heat exchanger coil. A water softener will

prevent this problem (See also “Sediment” above). Symptoms

would be reduced recovery capacity or reduced temperature

differential between boiler supply and return lines. Repeated

flushing should resolve the problem.

CAUTION

Before manually operating the valve, make sure that a

drain line has been attached to the valve to direct the

discharge to an open drain. Failure to take this precaution

could mean contact with extremely hot water discharging

from the valve during this checking operation.