Start Up; Filling The Water Heater; Initial Start Up; Draining The Water Heater - A.O. Smith 100 Series Instruction Manual

Refer to the Features And Components (page 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.
Electrical Shock Hazard
Full power is present whenever the
cabinet door is opened, even with
the pilot switch turned off.

FILLING THE WATER HEATER

CAUTION
Property Damage Hazard
To avoid water heater damage, fill tank with water
before operating.
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
5. and piping to be filled.
6. Close the hot water faucet as water starts to flow. The heater is
now ready for Startup and Temperature Regulation.

START UP

START UP

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 the instructions in Filling the Water Heater when restoring hot
water service.
17
• Burn hazard.
• Hot water discharge.
• Keep hands clear of drain
valve discharge.