Nibe F1255 Installer Manual page 30

Possible selection for AUX output (potential
free variable relay)
It is possible to have an external connection through the
relay function via a potential free variable relay (max 2
A) on the input circuit board (AA3), terminal block X7.
Optional functions for external connection:
Indication of buzzer alarm.
■
Controlling ground water pump.
■
Cooling mode indication (only applies if cooling ac-
■
cessories are available).
Control of circulation pump for hot water circulation.
■
External circulation pump (for heating medium).
■
External, reversing valve for hot water.
■
If any of the above is installed to terminal block X7 it
must be selected in menu 5.4, see page 51.
The common alarm is preselected at the factory.
NOTE
An accessory card is required if several functions
are connected to terminal block X7 at the same
time that the buzzer alarm is activated (see page
61).
AA3-X7
The picture shows the relay in the alarm position.
When switch (SF1) is in the " " or " " position the relay
is in the alarm position.
30 Chapter 5 | Electrical connections
External circulation pump, ground water pump or hot
water circulation pump connected to the buzzer alarm
relay as illustrated below.
1 2 3
C NO NC
AA3-X7
NOTE
Mark up any junction boxes with warnings for
external voltage.
F1X45
F1255
External
Externt
AA3-X7
Caution
The relay outputs can have a max load of 2 A
(230V ~).
1 2 3
C NO NC
AA3-X7
L
N
PE
L N PE
Circulation pump
NIBE™ F1255