Grundfos UPZCV-3, Installation And Operating Instructions Manual

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6
English (US)
Multi-zone valve board expansion
Fig. 3 UPZCV multi-zone valve board expansion
See fig. 3 .
• You can only use the MASTER controller
with PRIORITY.
• When priority calls, the MASTER board will
produce 5 VDC between terminals B and C.
This tells the SLAVE board to turn off any
zones that are calling for heat. This also will
close the contacts XX PRIORITY.
• When there is a demand for heat, the SLAVE
board will produce 5 VDC between terminals
A and C. This tells the MASTER board to
activate any boiler or secondary pumps and
close the contacts XX MAIN.
• You can connect the pump and valve boards.
• When the SLAVE board calls for heat, the
secondary pump will be powered. If a boiler
pump and secondary pump are to be used,
connect them to the same terminals.
• You can use the low voltage wire to connect
the ABC terminals.
• Connect the 120 VAC power supply to each
board.
TM
06
5
606
50
15
C
B
A
C
B
A
Master Slave
Master Slave
E
X
P
A
N
S
I
O
N
E
X
P
A
N
S
I
O
N
Master board
Slave board
Caution
CAUTION
Connect the L and N terminals the
same way on each board. If switched,
a differential of 240 VAC can occur
resulting in damage to the equipment.