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14.2
MAINTENANCE SCHEDULE
Equipment installed in a dusty or dirty contaminated atmosphere may require maintaining more frequently than on
an annual basis. When installed in a dusty or dirty environment, the combustion system should be checked at 3
month intervals to then determine the maintenance period required. Non-combustible particular matter such as
dust can block the ports of the burners and cause non-warrantable failures.
14.2.1
ADDITIONAL REQUIREMENTS FOR WATER HEATERS
Waterborne impurities consist of the particles of soil and sand, which can settle out and form a layer of sediment
on the bottom of the allied storage vessel. The amount of calcium carbonate (scale) released from water is in
direct proportion to water temperature and usage. The higher the water temperature or water usage, the more
scale deposits are dropped out of the water.
Scale accumulation not only reduces the life of the equipment but also reduces efficiency of the water heater and
increases fuel consumption. The usage of water softening equipment greatly reduces the hardness of the water.
However, this equipment does not always remove all of the hardness (scale). For this reason it is recommended
that a regular schedule of de-scaling be maintained.
14.3
DRAINING THE WATER SYSTEM
The appliance must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and
service procedures may also require draining the appliance.
1.
Turn off the electrical disconnect switch.
2.
Connect a hose to the drain valve.
3.
Locate hose’s discharge in an area where hot water will not cause any damage or injury.
4.
Close the cold water inlet valve to system.
5.
Open the system drain valve.
6.
Open any installed vent point in the system to allow the system to drain.
7.
If the appliance is being drained for an extended shutdown, it is suggested the drain valve be left open
during this period.
14.4
WATER HEATER SERVICING
14.4.1
REMOVING SCALE AND SEDIMENT FROM THE STORAGE VESSEL
1.
Drain the water system. Refer to Section 14.3 DRAINING THE WATER SYSTEM.
2.
Remove outer cover plate from lower side of storage vessel jacket.
3.
Remove cover and gasket from cleanout opening.
4.
Remove scale or sediment using care not to damage the enamel lining.
5.
Check the distribution tube for scale build up and clean as necessary.
6.
Inspect cleanout plate gasket and replace if necessary.
7.
Install gasket and cleanout plate. Draw plate up square by tightening screws evenly.
14.4.2
SACRIFICIAL MAGNESIUM ANODES
If the Correx non-sacrificial anode protection system is used, there is no requirement to check the
condition of the anodes.
The sacrificial magnesium anodes must
be inspected at least once a year.
