Electrical installation
52
Installation instructions geoTHERM 0020051574_04
7
7.3.5 Connecting the external electric auxiliary
heater (optional)
1
2 N PE
L
N
PE
S
S
L
N
PE
L3
N
PE
L2 L1
L3
N
L3 L2 L1
N
PE
L3 L2 L1
N
PE
400 V
3 x 13 A
2
400 V
50 Hz
1
7.10
Connecting the external electric auxiliary heater (optional)
VWS
L3 L2 L1
N
PE
L
N
PE
L
N
PE
L3
N
PE
L2 L1
L3
N
L3 L2 L1
N
PE
L3 L2 L1
N
PE
400 V
3 x 13 A
2
400 V
50 Hz
1
7.11
Connecting the external electric auxiliary heater (optional)
VWW
Key
Electric auxiliary heating
You can choose to connect an external electric auxiliary
heater (to be fitted on-site) to the heating boost function in
emergency operation .
a
Caution!
Risk of damage from overload.
The maximum output of the electric auxil-
iary heater must not exceed 3 x 3 kW (3 x
13 A).
>
Protect the electric auxiliary heater
using a safety thermostat (to be fitted
on-site) that does not automatically reset
and has all poles disconnected.
>
Connect the electricity supply for the electric auxiliary
heater (
1
).
>
Connect the electric auxiliary heater yourself (
2
).