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MAINTENANCE SCHEDULE
Following are the instructions for performing some of the recommended maintenance. Unit inspection and adjustment
should be performed by a competent technician.
Table 5. Suggested Maintenance Schedule.
COMPONENT
OPERATION
INTERVAL
REQUIRED
Tank
Sediment Removal
Monthly
Flushing
Anode Rods
Inspect
Semi-Annually
Replace as Required
Relief Valve
Check Operation
Semi-Annually
Proper Operation
Blower
Inspect
As Required
Proper Operation
Vent Air Intake System
Clean Inlet Screen
Every 3 Months
Free of Debris
Ignition System
Inspect
Annually
Clean of dust and dirt
Combustion System
Inspect
Monthly
Confirm S-OP
FLUSHING WATER HEATER
1. Turn OFF the water heater electrical disconnect switch.
2. Open the drain valve and allow water to flow until it runs clean.
3. Close the drain valve when finished flushing.
4. Turn ON the water heater electrical disconnect switch.
DRAINING WATER HEATER
The water heater must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and service
procedures may also require draining the water heater.
1. Turn off the water heater 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 water heater.
5. Open a nearby hot water faucet to vent the system.
6. Open the heater drain valve.
7. If the water heater is being drained for an extended shutdown, it is suggested the drain valve be left open during this
period.
FILLING WATER HEATER
1. Close the water heater drain valve by turning the valve stem clockwise. If alternative water connections are provided
but not used, make certain they are plugged (i.e. rear connections).
2. Open the cold water supply shut-off valve.
3. Open several hot water faucets to allow air to escape from the system.
4. When a steady stream of water flows from the faucets, the water heater is filled. Close the faucets and check for water
leaks at the water heater drain valve, combination temperature and pressure relief valve and the hot and cold water
connections.
SEDIMENT AND LIME SCALE REMOVAL
Waterborne impurities consist of the particles of soil and sand, which settle out and form a layer of sediment on the bottom
of the tank.
The amount of calcium carbonate (lime) released from water is in direct proportion to water temperature and usage. The
higher the water temperature or water usage, the more lime deposits are dropped out of the water. This is the lime scale,
which forms in pipes, water heaters and on cooking utensils.
Lime 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 (lime). For this reason it is recommended that a regular schedule of deliming be
maintained.
