Shutdown Procedure; Maintenance; T&P Relief Valve; Water Chemistry - Lochinvar Commercial Electric Water Heaters Installation And Service Manual

SHUTDOWN PROCEDURE

1. Turn off the main electrical power to the water heater. If
the power disconnect point is out of sight, lock it in the
open ("OFF") position and tag to prevent unexpected
application of power.
2. Turn the valve in the water heater's cold water supply to
the closed or "OFF" position.
3. Turn the valve in the water heater's hot water outlet to
t
closed or "OFF" position.
4. Manually open the temperature and pressure relief valve
to remove any pressure from the storage tank. Caution!
Any water discharged from the manually opened
relief valve may be hot and cause a scald injury.
5. Allow the system to cool and then open the drain valve
to empty the storage tank.
manually hold the temperature and pressure relief valve
in the open position to break the vacuum in the tank and
allow it to vent and drain. Insure that the water heater
drain is routed to a properly sized floor drain to allow the
water to be removed from the tank. If a floor drain is not
available, a hose may be attached to the water heater
drain to take the water outdoors.
6. The water heater is now shut down and ready for service
or maintenance.
7. Follow the filling and start up procedure to place the
water heater back into service.

MAINTENANCE

Listed below are items that must be checked to insure safe
reliable operations. Verify proper operation after servicing.
WARNING:
HAZARD OF ELECTRICAL SHOCK - Before
opening the electrical access door, removing the
heating element access panel or servicing the water
heater, make sure the electrical supply to the water
heater is turned "OFF". Failure to do this could
result in death, serious bodily injury or property
damage.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
h
It will be necessary to
TEMPERATURE AND PRESSURE RELIEF
VALVE OPERATION
The temperature and pressure relief valve(s) should be
manually operated at least once a year. A relief valve that
fails to completely reseat after manual operation and
continues to discharge water must be immediately replaced
with a new, properly sized, temperature and pressure relief
valve.
The relief valve(s) should be installed in the vertical
e
position and mounted in the tapping provided in the
storage tank. No valve should be placed between the relief
valve, and the water heater. To prevent water damage, the
discharge from the relief valve must be piped to a suitable
floor drain for disposal when relief occurs. No reducing
couplings or other restrictions shall be installed in the
discharge line. The discharge line shall allow complete
drainage of the valve and line. The discharge line from the
relief valve should be metallic pipe or a high temperature
plastic pipe (CPVC, etc.) to insure that hot water flow will
not damage the discharge piping from the relief valve.
Avoid contact with hot discharge water. Insure that
no one is in front of or around the relief valve
discharge line. Make sure that the extremely hot
water manually discharged from the relief valve
will not cause bodily injury or property damage.

WATER CHEMISTRY

In hard water areas, water treatment should be used to
reduce the introduction of minerals to the system.
Minerals in the water can collect in the storage tank and on
the immersion heating elements causing noise on
operation. Excessive build up of minerals on the surface of
the heating elements can reduce the service life of the
elements and lead to a non-warrantable failure.
Proper operation of this electric water heater is based on
heating potable water with a hardness of 5 to 25 grains per
gallon and a total dissolved solids not exceeding 350 PPM.
Consult the manufacturer when heating potable water
exceeding these specifications. Heating of high hardness
and/or high total dissolved solids water may require
frequent cleaning of the storage tank and heating elements
to achieve proper operation. The higher the level of
dissolved solids or water hardness, the faster the dissolved
minerals in the water will precipitate out and form scale
deposits on the heating elements and in the storage tank.
The level of scale formation is also accelerated as stored
water temperature increases. Water with a hardness of less
than 5 grains per gallon will usually have a low pH which
can be aggressive and corrosive causing non-warrantable
damage to the storage tank, heating elements and
associated piping.
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CAUTION