External Heat Source - Viessmann Vitocal 300-G BW Installation And Service Instructions Manual

Positioning of all terminals
Electric immersion heater EHE
Equipment
Electric immersion
heater EHE
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.
Equipment
Mixer motor, exter-
nal heat source
Control of an exter-
nal heat source
(cont.)
Connection
See DHW heating,
page 51
Connection
2X7.7VOPEN
1X1.?
1X2.N
2X7.8vCLOSE
(see page 45)
2X7.1
2X7.2
Installation sequence
Comments
ID Setting parameters (group)
Alternatively, the external heat source
can be used for DHW heating; connec-
tion on site
6014 Booster heater
Ó Yes (DHW)
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.
Comments
ID Setting parameters (group)
Directly controlled mixer without KM
BUS
No parameters need to be set.
Control via zero volt contact; observe
contact load
7B00 External heat source
Ó Yes (ext. heat source)
73