Operating instructions

55
Function description
Boiler temperature control (cont.)
Auxiliary circuits
H Two-stage/modulating burner:
An extension can be connected for
controlling a two-stage/modulating
burner.
H External hooking up:
The following external hook-ups
can be implemented with the
control module V:
Ĉ Separate heating program
changes for heating circuits
Please note:
The heating program changeover
can be effected for one heating
circuit or several heating circuits
simultaneously via plug aVD, see
coding address "91".
Ĉ External burner blocking
Ĉ External burner start
Ĉ External fault message input
Ĉ Central fault message
Ĉ External DHW circulation pump
start (short operation)
Control sequence
Boiler goes cold
(set value Ĉ2 K)
The burner start signal is set to the
set boiler water temperature Ĉ2 K,
and the burner starts its own
monitoring program.
The burner start may be delayed by
a few minutes subject to the number
of auxiliary circuits and the
combustion type.
The boiler heats up (set value +2 K)
The burner shuts down.
Modulating burner:
The burner shutdown point is
determined by the switch-off
difference (coding address "13").
5862Ă297ĂGB