For The Installer; Installation Procedures; General Installation; Water Connections - A.O. Smith DRE 52 Installation And User Instructions Manual

2. FOR THE INSTALLER

2.1

Installation procedures

The device may only be placed in a space
if this meets the valid national and local
regulations. This space must be frost free
or protected against frost.
The device may not be installed in damp
or wet areas. The insulation classification
of the device is: IP X1

2.1.1 General Installation

The installation shall be carried out by
a recognised installation engineer in
accordance with the generally and locally
applicable regulations for electrical and
water companies.

2.1.2 Water Connections

The maximum permissible operating
pressure of the device is 8 bar (= 800 kPa).
On the cold water side the device must
have a shut off valve and approved inlet
combination. The inlet combination must
be fitted as closely as possible on the
device in accordance with the regulations.
The inlet combination must be allowed
to work regularly with the aim of avoiding
a blockage as a consequence of scale.
The drainage pipe of the inlet combination
must be fitted in such a way that it
constantly slopes upwards. A stop valve
or non-return valve must never be fitted
between the inlet combination and the
device.
During heating of the device, expansion
water (as a result of the temperature
increase) will drip into the drainage via the
12
overflow of the inlet combination. This is
a normal occurrence. The dripping must
never be obstructed and/or blocked. The
drain must remain free at all times with
regard to the surroundings.
The device must be provided with a
temperature and pressure protection
mechanism (T&P valve). This is supplied
with the device. The overflow of the T&P
valve must be connected onto the drain.
When there is a water pipe pressure
greater than 8 bar (= 800 kPa) an
approved reduction device must also be
fitted.. When replacing an old device with
a new one the inlet combination must also
be renewed.

2.1.3 Electrical Connection

The electrical connection may only be
made by a recognised installation engineer
in accordance with the valid regulations of
the energy company. This device must be
provided with an all pole mains switch with
a contact separation of at least 3 mm if a
fixed connection is used.
This appliance has been subjected in
the factory to a complete earthing-, high
voltage- and funtional test.
As a result of transport and/or use of the
appliance, screwed wire connections
may loosen from vibration.
For this reason, before the appliance
is put into operation, all screwed wire
connections must be checked to see if
they are secure.
Also during inspection and maintenance
activities, all wire connections must be
checked.
Warning: The device must be earthed.