6 ELECTRICAL INSTALLATION
46
Figure 6�17 – detail wires and jumpers J21 - terminal/intermediate node CCI/DDC
LEGEND
DDC
CCI/DDC
J21
Jumper CAN-BUS in CCI/DDC board
A
detail case "terminal node" (3 wires; J21=jumper "closed")
B
detail case "intermediate node" (6 wires; J21=jumper "open")
H,L,GND
data signal wires
Detail terminal and intermediate node: jumpers position J21: "closed" - "open".
How to connect the DDC
The DDC requires a low voltage power supply (24 V) with a 230/24 V AC, 50 Hz safety transformer; the minimum power
requirement is 20 VA. For the connection use a cable with the minimum specifications 2 x 0.75 mm
2
.
Connect the DDC to the transformer via the 4-pole connector provide for this, following the diagram in Figure 6.18 p. 47. Pass the
cable through the opening in the cover before fixing the wires to the connector.
To power up the DDC, proceed as follows.
You will need: the appliance disconnected from the electricity supply
1.
Remove the DDC's back panel by undoing the 4 bolts securing it.
2.
Cut a suitable length of power cord (minimum 2x0.75 mm
2
).
3.
Pass the power cord (DDC side) through the hole in the DDC's cover and hook up as shown in the example, with the following
polarities: terminal 1 = 24 V; terminal 2 = 0 V; terminal 3 = ground.
Make the grounding connection on the transformer terminal connected to terminal 2 of the 4-pole connector (EP) of the
DDC. Terminal 2 is connected internally to terminal 3, and is thus grounded; if the transformer already has one wire ground-
ed, it must be connected to this terminal. Terminal 3 of the DDC’s 4 pole connector must always be grounded (r ≤ 0.1Ω).
4.
On completion, close the DDC's back panel with the 4 bolts.
The DDC is equipped with a backup battery which retains the memory settings in case of power failure. The backup battery
lasts approximately 7 years, after which time it must be replaced by an authorised Technical Assistance Centre.
Summary of Contents for LCGHP
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