Operation; General; Filling The Water Heater; Start Up - A.O. Smith dre-52 Instruction Manual

General

Refer to the Features and Components section of this manual
(pages 7 & 8) for the location of components mentioned in the
instructions that follow.
NEVER turn on power to the water heater without being certain the
water heater is filled with water and a temperature and pressure
relief valve is installed in the relief valve opening.
do not test electrIcal systeM Before heater Is
fIlled wIth water. follow fIllInG and start-up
InstructIons In operatIon sectIon.

fIllInG the water heater

1. Turn off the electrical disconnect switch.
2. Close the water heater drain valve.
3. Open a nearby hot water faucet to permit the air in the system
to escape.
4. Fully open the cold water inlet pipe valve allowing the heater
and piping to be filled.
5. Close the hot water faucet as water starts to flow. The heater is
now ready for STARTUP and TEMPERATURE REGULATION.

operatIon

InItIal start up
The following checks should be made by the installer when the
heater is placed into operation for the first time.
1. Turn off the electrical disconnect switch.
2. Open the front panel, check all water and electrical connections for
tightness. Also check connections on top and side of heater. Repair
water leaks and tighten electrical connections as necessary.
3. Depress the red manual reset button on each Thermostat/ECO
combination control (Surface Mount Control Models only).
4. Turn on the electrical disconnect switch.
5. Observe the operation of the electrical components during the first
heating cycle. Use care as the electrical circuits are energized.
6. Close the front panel.
Temperature control and contactor operation should be checked
by allowing heater to come up to temperature and shut
off automatically. use care as the electrical circuits are
energized.

draInInG the 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 heater.
1. Turn off the electrical disconnect switch.
2. Close the supply water inlet valve to heater.
3. Attach hose to outlet opening of drain valve and direct end
to drain.
4. Open a nearby hot water faucet and the heater drain valve.
5. If the heater is being drained for an extended shutdown, it is
suggested the drain valve be left open during this period. The
hose may be removed.
Follow FILLING instructions when restoring hot water service.
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