121
5-4 BOARDS REPLACEMENT
WARNING:
Before carrying out any work on the machine, make sure that its power supply is switched off and the access to it is
prevented.
Any work must be carried out by personnel qualified and authorized to work on this type of machine.
5.4.1 A2 BOARD REPLACEMENT
IMPORTANT: Some setting data (parameters) specific to each type of heat pump are stored in the EEPROM on
the (A2/CWC2) control board.
When replacing a PCB, it is necessary to remove the EEPROM from the malfunctioning board and re-install it on the
new board.
Procedure:
1) Before replacing the board (A2), make sure that the unit is switched off (“Power” LED
- red - is Off).
2) Disconnect completely all wires and connectors from the board.
3) Remove the board by pulling it off from the spacers (4).
4) Take out from the old board the EEPROM and possible wire jumper.
5) Plug the EEPROM (and possible jumper) on the specific socket of the new board. Respect position of the
EEPROM on its socket (see picture above). Be careful when handling the EEPROM, as its pins can be easily bent.
6) Make sure that micro switches SW1 / SW2 and jumpers JTP / JPC are in the right selection – refer to § 3.2.4 and
picture above.
7) Install the new board on the spacers and connect it while respecting wiring diagram.
8) Switch on again the unit. LED “Power” must be lighted on (If this LED is blinking or is off, check that EEPROM is
installed correctly).
9) Start the unit and check its correct operation.
Caution: If the EEPROM is not functioning correctly, alarm F29 appears. In that case, EEPROM must be changed also
(use the one delivered with the new board). Then, parameters specific to the unit must set in the
EEPROM, by means
of service remote control, before starting again the unit. For that refer to part 6.
To Next Page
Loading...
