
12
Multiple Controller Wiring
(Common Wire Isolation)
Wiring multiple controllers on a single project requires the common wire to be sepa-
rated from each of the controllers. The following diagrams illustrate how to wire these
types of installations.
Figure 12:
This wiring diagram shows how to wire two controllers to one common wire.
OPERATION:
CONTROLLER #1 HAS PRIMARY CONTROL OF THE SYSTEM.
WHEN IT IS ON. THE 2nd. CONTROLLER WILL BE AUTOMATI-
CALLY DISCONNECTED FROM THE FIELD COMMON. IF CON-
TROLLERS OPERATE AT THE SAME TIME. ONLY VALVES ON
THE #1 CONTROLLER WILL OPERATE.
CONTROLLER #1
PRIMARY UNIT
M.V. COM.
CONTROLLER #2
SECONDARY
UNIT
COM.
#1 CONT. MASTER VALVE
#1 CONT. COMMON
#2 CONT. COMMON
FIELD COMMON
ONE VALVE COMMON FOR TWO CONTROLLERS
COMMON
FIELD
MOUNT AUX. RELAY
IN ANY CONVENIENT
LOCATION, ON
EXTERNAL OF
CONTROLLER CABINET.
B A
9
8
7
6 5 4
3 2 1
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