Benchmark PulsaCoil 2000 Series Design, Installation And Servicing Instructions page 23

� � � � �
� � � �� �� ��
� � �
� �
����
����� ��
������ ����� ������ �����
��� ��� ������� ���
�
�
�
�
�
�� ��
�
��� ��� ����� �
� �
�� � ��
�� �� ��
�������
������ ���������
���� ������� ������
�� ������ ������
�� ������ ������
������� ��������������
��
���� ����
�� ���� �������
�� ���� ������ �������
3.0 SERVICING
3.4 FAULT FINDING
A number of the DHW faults indicated in the
above chart will be indicated by the pump
speed control PCB.
The layout of the pump speed control board
is shown opposite. In faulty conditions if the
hot water outlet temperature exceeds 60º,
the pump speed will be reduced to minimum
and if the outlet temperature exceeds 65ºC,
the pump will be switched off until the outlet
temperature reduces to 50ºC.
If hot water has not been used for a period of
30 hours the pump speed control board will
run the pump for approximately 3 seconds to
help prevent it sticking.
The red LED on the pump speed control board
will also flash differently to indicate a number
of fault conditions - see diagram opposite. If
necessary change the faulty sensor (fault 2,3,
or 4) board (fault 5) or fuse/check electrics
(fault 6) to resolve the problem.
If the problem cannot be resolved by
the installer the manufacturer should be
contacted.
When requiring a visit from the
manufacturer the installer must have the
completed 'Benchmark' commissioning/
service record sheet to hand to enable help
to be provided.
Page 23