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2.3
Installation
Before installation, read through item 2.3.1.
'
If the boilers are not connected to an electronic
sequencer or management system we recommend
the EXHAUSTO Relay Box ES12-EU-01 to interface
a maximum of 4 boilers, use multiple relay boxes for
more boilers. Please refer to the Instruction Manual
on ES12-EU-01 for wiring details.
2.3.1 Dipswitch setting (fig. 9-A)
Before starting up the system, check that the
dipswitch setting corresponds to the required operat-
ing mode.
Factory setting: All OFF
*) Must always be in OFF position if the extra pres-
sure differential switch (PDS) has not been con-
nected.
If the factory setting is to be changed, the black top
plate must be removed to get access to the dipswitch
block (see fig. 9).
1.
Remove the 4 serrated screws and lift the top
plate off the PCB.
2.
Change the dipswitch setting.
Dip-
switch
Name
OFF
ON
1
MANUAL
RESET
Automatic reset
after mains drop-
out and draught
fault
Manual reset
after mains
drop-out and
draught fault
2
POST
PURGE
No post-purge
3-minutes post-
purge
3
*)
PDS
CHECK
No control indicat-
ing that the pres-
sure differential
switch has been in
position NC before
starting up.
The pressure
differential
switch must be
in position NC
before starting
up
9
