Ecotec A4 Operation And Maintenance page 17

THE MAIN SWITCH MUST
ONLY BE SWITCHED OFF IN CONNECTION
WITH SERVICING AND MAINTENANCE.
REMEMBER TO SWITCH
ON THE MAIN SWITCH WHEN
SERVICING IS FINISHED.
Max. thermostat
The max. thermostat cable is prein-
stalled on connection terminal board 4
and 14 in the control system.
Connected to the system's max. ther-
mostat.
The max. thermostat must be equipped
with a manual reset.
Operational thermostat
The operational thermostat consists of
a separate temperature sensor and
cable. For installation on connection
terminal board 5 and 15 in the control
system. The cable can be extended, if
necessary, but should not be short-
ened.
The temperature is measured ana-
loguely.
The sensor should be fitted to the
plunge pipe to ensure correct tempera-
ture measurement.
Connecting an alarm unit
A buzzer or light is connected to the
potential-free contact, connection termi-
nal board K1 and K2.
The standard units are adapted for a
drive voltage between 12 and 24 VDC.
A cable is connected from connection
terminal board 13 (+VDC) to K1. (Con-
nection terminal board 13 can also be
used in connection with the feed to the
external alarm unit, such as a flue detec-
tor.)
The alarm unit is connected between
connection terminal board K2 and 18
(–VDC). (Connection terminal board 18 is
also used to connect the O
See connection table page 18-19.
Burner wiring
The multiconductor for the burner is
preinstalled in the control system. The
switch is connected to the left side of the
burner.
Microswitch
The burner's assembly on the boiler is
monitored using a microswitch.
17
-sensor.)
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