Maintenance; General; Draining And Flushing - State Water Heaters 301 Series Instruction Manual

GENERAL

Keep water heater area clear and free from combustible materials,
gasoline, and other flammable vapors and liquids. See
(page 11).
the Water Heater
Water heater maintenance includes periodic tank flushing and
cleaning, and removal of lime scale. The water heater should
be inspected and adjusted to maintain proper combustion. See
(page 53). A periodic inspection of the venting
Initial Start Up
system should be made, see
water circulating pump(s) should be oiled according to the pump
manufacturers recommendations.
PRECAUTIONS
CAUTION
Do not operate the water heater if it has
been exposed to or exhibits the following:
•
Exposed to flooding or water damage
• .
External damage.
•
Firing without water.
•
Sooting.
Do not operate the water heater until all corrective steps
have been made by a qualified service technician.
Never operate the water heater without first being certain it is filled
with water and a properly sized and rated Temperature-Pressure
Relief Valve is installed in the relief valve opening on the water
heater. See
Water Line Connections
If overheating occurs or the gas supply fails to shut off, turn off the
Main Gas Shutoff valve. See
Table 22. Maintenance Schedule
Component Operation
Lime Scale Removal
Tank (Water Less Than
25 Grains Hard)
Lime Scale Removal
Tank (Water Greater Than
25 Grains Hard)
Burner Inspection/Cleaning
Powered
Inspection/Cleaning
Anode Rods
T&P Valve Test Operation
Vent System Inspection

MAINTENANCE

Locating
(page 63). Where used,
Table 22
(page 43).
Explosion Hazard
Overheated water can cause
water tank explosion.
Properly sized temperature and
pressure relief valve must be
installed in the opening provided.
(page 40).
Figure 54
Interval Required
Not Required N/A
®
Annually
UN-LIME
Annually Clean Burner Surface
Not Required N/A
Semi Annually Test
• Termination Screens
Annually Clean
• Reseal/Repair

DRAINING AND FLUSHING

It is recommended that the water heater storage tank be drained
and flushed every 6 months to reduce sediment buildup. The
water heater should be drained if being shut down during freezing
temperatures. See
Features and Components
location of the water heater components described below.
Draining the Water Heater Storage Tank
1. Turn the Enable/Disable switch located on the front of the heater
to the Disabled position.
2. Turn off the electrical supply to the water heater.
3. Turn off the gas supply at the Main Gas Shutoff Valve if the
water heater is going to be shut down for an extended period.
4. Ensure the cold water inlet valve is open.
5. Open a nearby hot water faucet and let the water run until the
water is no longer hot.
6. Connect a hose to the water heater drain valve and terminate
it to an adequate drain.
7. Close the cold water inlet valve.
8. Open the water heater drain valve and allow all the water to
drain from the storage tank.
9. Close the water heater drain valve when all water in the storage
tank has drained.
10. Close the hot water faucet opened in Step 5.
11. If the water heater is going to be shut down for an extended
period, the drain valve should be left open.
Flushing the Water Heater Storage Tank
1. Turn the Enable/Disable switch located on the front of the heater
to the Disabled position.
2. Turn off the electrical supply to the water heater.
3. Ensure the cold water inlet valve is open.
4. Open a nearby hot water faucet and let the water run until the
water is no longer hot. Then close the hot water faucet.
5. Connect a hose to the drain valve and terminate it to an
adequate drain.
6. Ensure the drain hose is secured before and during the entire
flushing procedure. Flushing is performed with system water
pressure applied to the water heater.
7. Open the water heater drain valve to flush the storage tank.
8. Flush the water heater storage tank to remove sediment and
allow the water to flow until it runs clean.
9. Close the water heater drain valve when flushing is completed.
10. Remove the drain hose.
11. Fill the water heater - see
12. Turn on the electrical supply to place the water heater back in
operation.
13. Allow the water heater to complete several heating cycles to ensure
it is operating properly.
63
(page 8) for the
Burn hazard.
Hot water discharge.
Keep clear of Temperature-
Pressure Relief Valve
discharge outlet.
(page 53).
Filling The Water Heater