A.O. Smith DHE-10.000, Installation And Operaion Manual

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14
HOTTER WATER CAN SCALD: Water heaters are intended to
produce hot water. Water heated to a temperature which will
satisfy space heating, clothes washing, dish washing, and other
sanitizing needs can instantly scald and permanently injure you
upon contact. Some people are more likely to be permanently
injured by hot water than others. These include the elderly,
children, the infirm, or physically/developmentally disabled.
If anyone using hot water in your home fits into one of these
groups or if there is a local code or state law requiring a certain
temperature water at the hot water tap, then you must take special
precautions. In addition to using the lowest possible temperature
setting that satisfies your hot water needs, a means such as
a mixing valve, should be used at the hot water taps used by
these people or at the water heater. Mixing valves are available
from your local plumbing contractor. Follow manufacturer’s
teMperature reGulatIon
operatIon
General
Refer to the Features and Components section of this manual
(pages 6 & 7) for the location of components mentioned in the
instructions that follow.
neVer operate the heating elements without being certain the water
heater is filled with water, and a temperature and pressure relief valve
is installed in the relief valve opening on top of the heater.
An electric type low water cutoff is provided on all heaters as standard
equipment. The water probe is installed near the top of the tank to
monitor the presence of water. The control circuit is opened if the
water level is below this point.
The pilot switch (power on/off toggle switch) on the cabinet front
permits the heater to be turned on and off without having to operate
the electrical disconnect switch.
Optional manual override switches on the cabinet front allow elements
to be manually de-energized if full capacity is not needed.
fIllInG the water heater
To fill the water heater with water:
1. Turn off the electrical disconnect switch.
2. Turn off pilot toggle switch.
3. Close the heater drain valve.
4. Open a nearby hot water faucet to allow the air in the system to escape.
5. Fully open the cold water inlet valve, filling the heater and piping.
6. Close the hot water faucet when water starts to flow from the
faucet. Leave the cold water inlet valve fully open. The heater
is now ready for start up and temperature regulation.
7. Close the cabinet door and perform start up checks listed below
before turning on the electricity.
start up
The following checks should be made by the installer when the water
heater is placed into operation for the first time:
1. Check all factory and field made water and electrical connections
for tightness. Also check connections on top of the heater. Repair
water leaks and tighten electrical connections as necessary.
2. Turn on the electrical disconnect switch and pilot toggle switch.
The pilot toggle switch is located on cabinet.
3. Observe the operation of the electrical components during the
first heating cycle. use care as the electrIcal cIrcuIts
are enerGIZed.
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/
or exposed to freezing temperatures. Maintenance and service
procedures may also require draining the heater.
1. Turn off the electrical disconnect switch.
2. Turn off pilot toggle switch.
3. Close the cold water inlet valve to heater.
4. Open a nearby hot water faucet to vent the system.
5. Open drain valve.
6. If the heater is being drained for an extended shutdown, it is
suggested the drain valve be left open during this period.
Follow FILLING instructions when restoring hot water service, see
the list above.