Lochinvar LCGHP, User Manual, Page: 49 / 68

6 ELECTRICAL INSTALLATION
Installation, user and maintenance manual – LCGHP/LSGHP
49
Figure 6�20 – Connexion cable CAN BUS for plants with more unit
Connexion câble CAN BUS between one DDC and more unit
How to connect the plant water circulation pump
The control of the circulation pump from the electronic board of the appliance depends on the power rating of the pump itself. There
may be 2 different cases:
▶
If the power of the pump is lower than 700 W, make the connection as shown in Figure 6.21 p. 50 and check that the jumper
J10 (located at the bottom left of the electronic board, above the "NO Contact" contacts) is CLOSED, as shown in detail A.
▶
If the power of the pump is equal to or higher than 700 W, make the connection as shown in Figure 6.22 p. 50 using a relay. In
this case the jumper J10 (located at the bottom left of the electronic board, above the "NO Contact" contacts) must be OPEN, as
shown in detail A.
LEGEND DDC
dir
ec
t dig
ital c
on
trol
SCH
elec
tronic boar
d S61
J1
Jumper C
AN-BUS in boar
d S61
J21
Jumper C
AN-BUS in boar
d DDC
A
ter
minal nodes c
onnec
tion - (3 wir
es; J1 e J21 = "
closed")
B
in
ter
media
te node c
onnec
tion - (6 wir
es; J1="
open
")
H,L,Gnd
da
ta sig
nal wir
es (r
if. cables table)