23
CTC EcoPart XL
General
5
5
Communication in
Communication in
(last cooling module)
Shielding
Shielding
Green
Green
Green
White
White
White
Brown
Brown
Brown
Shielding
Communication out
(to next cooling module)
5.1 Series connection of heat pumps
When connected in series, the shielding of the communication cable on the
last heat pump shall be connected to earth (see Shielded communication)
and the heat pump shall also be terminated (see Terminated position).
5.1.1 Shielded
communication
The jumper (5) located between position PE on the control terminal block
and position Sc on the mains terminal block must be removed from all heat
pumps except the last one in the connection chain, and the shielding for the
cable that is redirected to the next heat pump must be connected to the
same terminal block as the incoming shielding.
5.1.2 Terminated position
The last heat pump (the cooling module) connected in series must be
terminated. The top cooling module (CM2) is pre-terminated at the factory –
ON, but not cooling module 1 (CM1) – OFF. Cooling module 1 may not be
terminated since this interrupts the communication. Ensure that DIP switch 2
is in the ON position on the cooling module that is to be terminated.
ON
ON
1 2
CM2
CM1
