Viessmann VITOCAL 350-A, Installation And Service Instructions Manual

Page: 96 / 256

96
For further information, see from
page 104.
Immersion heater EHE
Connection
Installation instructions, immersion heater EHE
Appliance Connection Required parameters:
Parameter
Ó
setting
Immersion heater EHE 2X8.13
1X1.
?
1X2.N
(see page 48)
"DHW"
■ "Booster heater"
Ó
"Yes"
Note
Alternatively, an external heat source
can be installed on site for DHW heat-
ing.
External heat source
!
Please note
Protect the heat pump against
temperatures over 70 °C from the
external heat source.
Install a high limit safety cut-out
or take further measures if
required.
Note
■ The switching contact to demand heat
from an external heat source in the
heat pump ("Ext. HS for DHW") 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; that requires an
on-site relay.
■ The boiler water temperature sensor in
the external heat source (identification
F20; terminal 3X1.4/3X2.4) must cap-
ture the average temperature of the
external heat source.
Installation sequence
Electrical connections in the heat pump control…
(cont.)
5414 828 GB