Bosch 11 KW Manuel d'instructions télécharger pdf (Page 34)

ELECTRICAL CONNECTIONS

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14.4 COMBINED OPERATION OF TWO HEAT PUMPS (CASCADE CONNECTION)

Fig. 40 CAN-BUS overview with two heat pumps

1. Connect the new cabling (according to specified cable) between

screw terminal 31-34 on the PEL board (heat pump 1) and screw

terminal 31-34 on the PEL board (heat pump 2).

2. Remove the display cabling in heat pump 2 between BAS and LCD.

Remove the bottom strap to release the cable.

3. Pull out the earth wire from the removed display cabling and re-

connect this to the earth terminal and the earth plate in the front plate

of the heat pump 2.

4. Re-connect CAN-BUS with existing CAN-BUS cabling in heat pump 2

(Figure 40).

5. Use cable ties to again fasten cabling in a suitable manner.

6. Re-address BAS (heat pump 2) from A=0 to A=1 (Figure 41). Set

termination switch to Term mode on PEL (heat pump 2).

If additional multi modules are to be connected this can be done from

either heat pump 1 or heat pu mp 2 - PEL CAN 2 and then set the

termination switch to non-Term mode.

Fig. 41 Addressing heat pumps 1 and 2.

14.4.1 SETTING THE CONTROL UNIT

START-UP MENU

When both heat pumps are correctly set in operation according to the

system solution chosen, the size and hot water production of both heat

pumps 1 and 2 is set.

> Heat pump 1

>> Hot water production

▶Select Yes for heat pump 1.

> Heat pump 1 capacity

▶ Select size of heat pump 1.

> Heat pump 2

>> Hot water production

▶Select No for heat pump 2.

> Heat pump 2 capacity

▶ Select size of heat pump 2.

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CAUTION: Do not mix up the 12V and CAN-BUS

connections!

The processors are destroyed if 12V is connected to the

CAN-BUS.

▶ Check that the four cables are connected to the

contacts with the corresponding marking on the

circuit board.

In cascade connection both heat pumps must have the

same output.

NOTICE: PSU and LCD (Figure 40) in heat pump 2 are

factory connected, these must be disconnected and are

not used in cascade connection

The recommended cabling is cable type LIYCY (TP)

2x2x0.5. The cable must be twisted pair and screened.

The screen must only be earthed at one end and to the

chassis. Maximum cable length is 30 m.

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Bosch 11 KW Manuel d'instructions Page 34

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