Electrical installation
Installation instructions geoTHERM 0020051574_04
51
7
7.3.4
Connecting the external well pump
(VWW only)
L3 L2 L1
N
PE
L3 L2 L1
N
PE
L
N
PE
L
N
PE
L3
N
PE
L2 L1
L3
N
L3 L2 L1
N
PE
U
max
= 230V
I
max
= 5 A, VWW 220...300/2
I
max
= 8,5 A, VWW 380...460/2
1
7.9
Connecting the external well pump (VWW only)
Key
Pump (well water circuit pump)
Heat source circuit
The well pump is supplied with a three-phase 400 V voltage
via the well pump protector contactor (
12
) (
¬
Fig.
7.1
) or (
11
)
(
¬
Fig.
7.2
).
An overcurrent relay (motor protection switch) (
10
)
(
¬
Fig.
7.1
)
or (
9
)
(
¬
Fig.
7.2
) secures the external well pump
against overload.
>
Connect the well pump that is to be installed by the cus-
tomer to the terminals (
1
).
b
Caution!
Risk of damage from overload.
The overcurrent relay (motor protection
switch) must be correctly adjusted to the
rated current of the well pump in order to
protect the pump against overload.
>
Use the control button (
9
) (
¬
Fig.
7.1
)
or
(
8
) (
¬
Fig.
7.2
) on the overcurrent relay
to set the breaking current to 10 %
above the rated current of the well pump
(0.8 - 2.7 A).
