A.O. Smith DRE 52, Installation, User And Service Manual

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6 Safety
6.1 Safety instructions
For safety instructions on the use of the water heater, refer to Safety (see 2) in the User
part of this manual.
Warning
Installation, maintenance and service must be carried out by a qualified engineer in
compliance with the general and local regulations imposed by the water and power
supply companies and the fire brigade.
Warning
The water heater may only be installed on a non-flammable floor or surface.
Warning
Isolate the heater from the mains before you start maintenance or repairs. Leave the
water heater electrically isolated until you are ready to commission it.
Caution
The water heater may only be moved in an upright position. After unpacking, make sure
that the water heater is not damaged.
Caution
Fill the water heater completely before use. Dry firing will damage the water heater.
Caution
The anode protection remains active when the water heater is in OFF mode.
Caution
Water may drip from the discharge pipe of the pressure-relief device. This pipe must be
left open to the atmosphere.
Caution
Operate the pressure-relief device regularly to remove lime deposits and to verify that it
is not blocked.
Caution
When installing the heater, you need an expansion valve. The expansion valve and
associated fittings are not included in the package. The expansion valve must be suitable
for a water pressure level of up to 800 kPa. Install the expansion vessel and expansion
valve as close as possible to the water heater.
Warning
Never install a stop valve or a non-return valve between the expansion vessel/expansion
valve and the water heater.
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