Viessmann VITODENS 242-F Installation And Service Instructions Manual page 32

Installation sequence
Electrical connections
aVG %
D
External demand via switching contact
Connection options:
■ Extension EA1 (accessory, see sepa-
rate installation instructions).
■ Plug lH.
Burner operation is load-dependent if the
contact is closed. The boiler water is
heated to the value set in coding address
"9b" in group "General"/1. The boiler
water temperature is limited by this set
value and the electronic maximum limit
(coding address "06" in group "Boiler"/
2).
32
(cont.)
C
&
B
A
Connect collector temperature sensor
A to terminal box B with the prefitted
lead of SM1 solar control module C.
On-site extension cable D: 2-core,
cross-section of 1.5 mm
Note
Cylinder temperature sensor % is con-
nected at the factory.
!
Please note
'Live' contacts lead to short cir-
cuits or phase failure.
The external connection must be
potential-free and comply with
the requirements of safety cate-
gory II.
2
.