Lochinvar LCGHP User Manual - page 45
6 ELECTRICAL INSTALLATION
Installation, user and maintenance manual – LCGHP/LSGHP
45
As shown in Table 6.2 p. 36, the CAN connection requires a CAN BUS cable with 3 cores. If the cable available has more than 3
coloured wires, use the wires with the colours indicated in 6.2 p. 36 and cut the remaining ones.
The ROBUR NETBUS cable is available as an accessory.
How to connect the CAN BUS cable to the appliance's electronic board
The CAN BUS cable must be connected to the dedicated terminals on the appliance’s electronic board, as shown below (see Figure
6.9 p. 37).
Before working on the electrical panel of the appliance, make sure that power supply is off.
1.
Cut a length of cable long enough to allow installing it without kinking.
2.
On one end of the cable, remove the jacket for a length of approximately 70-80 mm, taking care not to cut the shielding (metal
mesh and/or aluminium sheet and, if present, the bare connector in touch with the shield) and the wires contained within.
3.
If the cable is too thin to be held in place in the cable holding bracket (detail C in Figure 6.9 p. 37), make it thicker by wrap-
ping insulating tape around the jacket close to the stripped part (to an approximate diameter of 12-13 mm).
4.
Pull back the shielding on the jacket; apply isolating tape to the end of the shielding as pulled back (detail A, Figure 6.9 p. 37).
5.
If the appliance is a terminal node of the network connect the three coloured wires to the orange connector as shown in
detail "A" of Figure 6.10 p. 38. Respect the correct indications L, H, GND provided in Table 6.2 p. 36, on the figure and on
the electronic board below the connector.
6.
If the appliance is an intermediate node repeat the operations from step 2 to step 5 for the other cables required (in this way
you will have two cable lengths each one without the jacket on one end). Twist together the cores with the same color and
connect them to the orange connector, as shown in detail "B" of Figure 6.10 p. 38.
7.
Fix the CAN BUS cable (or two cables, according to the type of node being connected) to the holding bracket in the upper part
of the electrical panel so that the pulled-back shielding is in solid touch with the metal bracket. The cables must be firmly held
in place by the bracket if pulled.
In order to position the jumpers on the electronic board according to the type of node being configured:
▶
If the appliance is a terminal node on the network (i.e. 3 wires are inserted in the orange connector on the board): set the jump-
ers as shown in detail "A" of Figure 6.10 p. 38:
▶
If the appliance is an intermediate node on the network (i.e. 6 wires are inserted in the orange connector on the board); set the
jumpers as shown in detail "B" of Figure 6.10 p. 38:
8.
After finished with all the above operations, close the electrical panel and refit the front panel of the appliance.
How to connect the CAN BUS cable to the DDC
The CAN bus cable is connected to the specific orange connector (P8) supplied with the DDC in a bag.
Before working on the DDC, make sure that it is off.
The DDC, like the controller on the appliance, has jumpers that must be moved so that it can be configured as an intermedi-
ate or terminal node. The position of the jumpers on a new DDC is CLOSED.
To connect the CAN bus cable to a DDC:
You will need: DDC not powered up.
1.
Depending on the type of node being configured, set the DDC's jumpers J21 as shown in detail "A" or detail "B" in Figure
6.17 p. 46. If necessary, open the DDC's back pa nel (4 screws); after jumpers J21 have been correctly positioned, close the
cover again and retighten the 4 screws.
▶
If the DDC is an intermediate node on the network (with no. 6 wires in the orange connector "P8"): set the jumpers "J21" as
shown in detail "B" of Figure 6.17 p. 46: Jumpers OPEN.
▶
If the DDC is an terminal node on the network (with no. 3 wires in the orange connector "P8"): set the jumpers "J21" as shown in
detail "A" of Figure 6.17 p. 46: Jumpers CLOSED.
2.
Prepare the orange CAN bus connector, from the supplied sleeve.
3.
Cut a length of cable long enough to allow installing it without kinking.
4.
Remove the sheath for a length of approximately 70-80 mm, taking care not to cut the shielding (metallic shield and/or alu-
minium sheet and, if present, the bare connector in contact with the shield) and wires contained inside.
5.
Roll the shielding and connect it to a 4-mm eyelet terminal, as illustrated in Figure 6.11 p. 39, details C and D. Now proceed
as follows:
6.
If the DDC is an terminal node connect the three coloured wires to the orange connector "P8", following the diagram provided
in detail "A" of Figure 6.17 p. 46. Observe the terminal markings L, H, GND (on the DDC at the base of the socket "P8") which
are given both in Table 6.2 p. 36 and in the example.
7.
If the DDC is an intermediate node repeat the operations from step 2 to step 4 for the other length of CAN bus cable re-
quired. Connect the six coloured wires to the orange connector "P8", following the diagram provided in detail "B" of Figure
6.17 p. 46. Observe the terminal markings L, H, GND (on the DDC at the base of the socket "P8") which are given both in Table
6.2 p. 36 and in the example.
8.
Insert the orange connector ("P8") with the wires first into the opening prepared in the cover of the DDC, and then into the
appropriate socket on the DDC itself, making sure it is correctly inserted.
9.
Use the rear cover bolts located near the CAN BUS socket to secure the 4 mm eyelet (or 2 eyelets) (detail D, Figure 6.11 p. 39).
The cable should be secured against pulling out.