Installation, user and maintenance manual
– GAHP-A
47
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 sure the grounding connection on the transformer terminal is 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 grounded, 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 Potterton Commercial Technical Engineer.
Figure 5.11
– DDC - electric supply
DDC electric supply from external transformer
LEGEND
DDC
Direct Digital Control
AL
supply 4 poles connector
1
clamp and wire for 24 Vac supply
2
clamp and wire for 0 Vac supply
3
clamp and wire for ground contact
(required
connection)
DDCTR
safety
transformer
- (230/24 Vac
50/60 Hz)
The following wiring diagrams show the connection of the DDC to 1 appliance (Figure 5.12
Connection cable CAN BUS for plants with one unit see page 48) and 2 appliances (Figure
5.13 Connection cable CAN BUS for plants with more unit see page 49) respectively.
