Draining And Flushing; To Drain The Water Heater Storage Tank; To Flush The Water Heater Storage Tank - Giant UG40 Installation And Operating Manual

WARNING

DRAINING AND FLUSHING

Periodic draining and cleaning of sediment from the tank
maybe necessary. It is recommended that the tank be
drained and flushed every 6 months to remove sediment
which may build up during operation. The water heater
should be drained if being shut down during freezing
temperatures. See "Typical Installation"
manual for location of the water heater components
described below.
DANGER
BURN

To Drain The Water Heater Storage Tank

1. Turn "OFF" the electrical supply to the water heater.
2. Turn "OFF" the gas supply at the Main Gas shut-off
Valve.
3. Open a hot water faucet and let the hot water run until
it is cool (This may take 10 minutes or longer).
Warning: Be sure the water runs cool before draining the
tank to reduce the risk of scalding.
4. Connect a garden hose to the drain valve and place
the other end of the hose in an adequate drain . Note
that sediment in the bottom of the tank may clog the
valve and prevent it from draining. If you can't get the
tank to drain, contact a qualified person.
5. CLOSE the cold-water inlet valve to the water heater.
6. Open the drain valve on the water heater.
7. If not already done, open a hot water faucet to help
the water in the tank drain faster.
8. If a large amount of sediment was present when
the tank was drained, follow instructions in the

"To Flush The Water Heater Storage Tank"

9. Close the water heater drain valve when all water in
the storage tank has drained and remove the hose.
Explosion Hazard
•
Temperature-pressure relief
valve must comply with ANSI
Z21.22-CSA4.4 and ASME
code.
•
Properly sized temperature-
pressure relief valve must be
installed in opening provided.
•
Do not plug, block, or cap the
discharge line.
•
Failure to follow this warning
can result in excessive tank
pressure, serious injury or
death.
section in this
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.
section.
10. Follow instructions in the
section.
11. Follow the lighting instructions on the label or see
"Lighting Instructions"
Note: If the water heater is going to remain shut down and
empty for an extended period, the drain valve should be
left open with hose connected allowing water to terminate
to an adequate drain.
To Flush The Water Heater Storage Tank
Follow Step 1 through
"To Drain The Water Heater Storage Tank"
1. Flush the tank by opening the cold water supply valve
and letting the water run until no more sediment drains
from the tank.
2. Close the water heater drain valve when flushing is
completed and remove the drain hose.
3. Ensure the heater is full of water.
4. Follow instructions in the
section.
5. Follow the lighting instructions on the label or see
"Lighting Instructions"
Caution: Do not turn on power to the water heater unless
the tank is full. Open a hot-water faucet and allow the
water to run until the air is purged and the water flows
uninterrupted from the faucet.
Important: When operating a cold tank, condensation can
occur and drip on the burner. This should not be confused
with a tank leak.
40
"Filling The Water Heater"
to restart the water heater.
Step 7 in the
section.
"Filling The Water Heater"
to restart the water heater.