LiquidWatch Installation Manual
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4 Output Relay Module Installation
4.1 Output Relay Module Wiring
The LiquidWatch leak detection system is supplied with a common alarm relay that is switched if any
probe is in alarm. If specific relay activation is required for a specific probe, 1 to 4 output relay modules,
ORM-4, can be installed. Each ORM-4 includes an 8” x 6” x 4” NEMA 4X enclosure and an RM-4 Relay
Module consisting of 4, 10 A, 250 VAC, form C contact relays. The relays are organized in 4 banks of 4.
Each relay module has a bank select jumper, P5 that can be set to bank 1 through bank 4 and configure
the relays as follows:
Bank Relay Number
1 1 - 4
2 5 - 8
3 9 - 12
4 13 - 16
Labels are supplied to place on the circuit board next to terminal strip P1 to renumber the relays.
The relays are energized in the normal state and de-energized in alarm conditions. Therefore, the
common (C) and normally open (NO) contacts are closed in normal conditions. The output relay cannot
be reset until the alarm condition is clear or the probe is taken off-line.
Each ORM-4 enclosure is located next to the LiquidWatch panel. A 36” ribbon cable connects plug P4
on the main controller board to plug P2 on the first ORM-4. Additional ORM-4s are connected in series
from plug P3 on one board to plug P2 on the next, etc. (see Figures 6 and 16).
PermAlert also offers an optional ORP-16 Output Relay Panel. The ORP- 16 includes a 10” x 8” x 4”
NEMA 4X enclosure and one RM-4 Relay Module. It is expandable to house a maximum of four RM-4s
or 16 relays.
Each ORP-16 Output Relay Panel also includes 4 ribbon cables. All ribbons will only be used if 4 RM-4s
are installed (save extra ribbons for later expansion in the panels). There are two #1 ribbons that are
each 2” long and connect plug P2 to plug P3 on adjacent RM-4s. A 10” ribbon, ribbon #2, is used inside
the panel to connect P2 and P3 as shown. The 36” ribbon, ribbon #3, runs from P4 on the LW-64/LW-
64-IS main controller board to P2 on the first RM-4 in the relay panel.
The relay wiring terminals will accept #26 – #16AWG wire.
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