Baxi DN 25 Installation And Operating Instructions For The Specialised Installer page 10

6.2 Use of high-efficiency pumps
Europe's leading manufacturers of heating
pumps have agreed on a uniform rating of
energy consumption. The energy label is
comparable with that of refrigerators and
other house hold appliances. The latest
high-efficiency pumps (ECM technology,
synchronous
magnetic rotor) have a class A rating. The
efficiency of these pumps is twice that of
classic pumps (asynchronous motors).
The pump speed (pump capacity) is
automatically adapted to the requirements.
As a result, the energy consumption can
be reduced by 80%
NOTICE
A modification of the thermal insulation is
not permissible The pump motor must not
be covered
Important information on the replacement/
connection of controllers and speed controlled
high-efficiency pumps
In addition to the power supply cable (230 V), speed
controlled high-efficiency pumps call for a separate
cable for the transmission of the control signal. The
most common control signals are 0-10 V and pulse-
width modulated signals (PWM) of proportional and
inverted type.
The type of signal is specified in the operating
instructions of the corresponding pump If the control
signals of the controller and the pump are not
coordinated, an operation is not possible.
10
motor with permanent
NOTICE
To avoid malfunctions and severe damage
to installations with speed controlled high-
efficiency pumps, the following must be
observed:
– The pump must only be replaced with a
pump with identical control signal
− The controller must only be replaced with
a controller with identical control signal
− When combining a pump and a
controller with different control signals,
operating safety is no longer guaranteed.
Wrong control signals may cause
damage to the installation and endanger
health
− The following functional test has to be
carried out when putting the controller
or pump into operation and when
replacing them:
1. Switch pump to "ON" in the manual
menu (relay test) – the pump is in
operation now.
2. Now switch the pump to "OFF" in the
manual menu – the pump is no longer
in operation.
– Work on electrical installations must only
be carried out by a qualified electrician.
− Always disconnect the power supply
before starting work on electrical
components.
− If not stated otherwise, all work and
settings must only be carried out by a
trained tradesman.
− Under working conditions,
efficiency pumps are almost silent.
Malfunctions caused by airlocks could
be confounded with a pump defect. This
has to be taken into account when
carrying out the functional test
high-