Viessmann Vitocal 300-G BW, Installation And Service Instructions Manual

Page: 73 / 216

73
Electric immersion heater EHE
Equipment Connection Comments
ID
Setting parameters (group)
Electric immersion
heater EHE See DHW heating,
page 51 Alternatively, the external heat source
can be used for DHW heating; connec-
tion on site
6014 Booster heater
Ó
Yes (DHW)
Installation instructions, immer-
sion heater EHE
External heat source
!
Please note
Protect the heat pump against
temperatures in excess of 70 °C
from the external heat source.
Install a high limit safety cut-out
(STB) or take further measures, if
required.
Note
■ The switching contact to demand heat
from the external heat source (ext. HS)
in the heat pump is a zero volt N/O
contact that closes in case of heat
demand.
■ This contact can be subjected to a load
of 230 V/4(2) A in case of an external
voltage supply. Never route low volt-
age via this contact; for that an on-site
relay is required.
■ Sensor F20 must capture the media
temperature of the external heat
source.
Equipment Connection Comments
ID
Setting parameters (group)
Mixer motor, exter-
nal heat source 2X7.7
V
OPEN
1X1.
?
1X2.N
2X7.8
v
CLOSE
(see page 45)
Directly controlled mixer without KM
BUS
No parameters need to be set.
Control of an exter-
nal heat source 2X7.1
2X7.2 Control via zero volt contact; observe
contact load
7B00 External heat source
Ó
Yes (ext. heat source)
Installation sequence
Positioning of all terminals
(cont.)
5368 522 UAE
Installation