Viessmann B2HF, Installation And Service Instructions For Contractors

Page: 120 / 136

120
For correct capture of the collector temperature, the
interval function cyclically switches on the collector cir-
cuit pump briefly. See parameter 1719.0
External heating circuit hook-up (if installed)
Note
Only in conjunction with weather-compensated opera-
tion.
■ Function:
– If the external demand is active (plug 96 or digital
input on DIO electronics module closed), the heat-
ing circuit is supplied with heat.
– If the external demand is inactive (contact open),
heat supply to the heating circuit ends (regardless
of current set room temperature or the switching
time).
!
Please note
There is no frost protection for the connec-
ted heating circuits.
■ Connection:
– If just one heating circuit is web connected, use
plug 96. See page 26
– If several heating circuits (max. 3) are web connec-
ted, all contacts are connected at EM-EA1 exten-
sion (DIO electronics module).
See EM-EA1 extension installation instruc-
tions
Function description
Interval function, solar circuit pump
5593201
Functions