GAHP-W – Installation, start-up, use and maintenance manual
44
Edition:
2014-08
Figure 25 -
CAN-bus connection to the DDC: “intermediate” node
Figure 26 -
CAN-bus connection to the DDC: “terminal” node
Supply Power to the DDC
The DDC requires a low voltage (24 V) power supply.
Install a dedicated 230/24 V, 60Hz safety transformer (minimum 20 VA).
Connect the DDC to the transformer using the 4-pole connector. See Figure 24.
•
TERMINAL 1: 24 V
•
TERMINAL 2: 0 V
•
TERMINAL 3: GROUND (connect to a safety ground socket, r
≤
0,1
Ω
)
•
TERMINAL 4: Not used
The DDC is equipped with a backup battery in order to help avoid data loss.
3.4 OPERATION OF THE GAHP-W AND W-LB
Preliminary checks to be performed by the qualified installer. Proceed with the start-up
only if the below conditions have been satisfied.
•
the appliance is fitted for the proper type of gas by checking the rating plate. Robur
GAHP-W and W LB units are designed to operate with either natural gas or L.P.G.
H L GND
J21
DDC
DDC
H L GND
J21
Summary of Contents for GAHP-W
Page 8: ...GAHP W Installation start up use and maintenance manual 6 Edition 2014 08...
Page 37: ...Electrical connections 37 Figure 14 Internal electrical wiring diagram...
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