Table of Contents
Advertisement
ELECTRICAL CONNECTIONS
14.4 COMBINED OPERATION OF TWO HEAT PUMPS (CASCADE CONNECTION)
Fig. 40 CAN-BUS overview with two heat pumps
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.
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.
34
1
2
7
7
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.
6 720 802 416-19.1I
1
2
6 720 806 768 (2013/02)
Advertisement
Table of Contents
