2-14
Opt
ional Alarm Beacon
Your unit may have an optional alarm kit installed. This kit is made up of
a beacon on the top of the unit. It is factory-wired so no additional wiring
is necessary; it lights when any alarm indication is given by the
instrument. This function parallels the audible alarm output (when the
horn sounds, the beacon will light).
Relay Outputs
Alarm Relays
There are three alarm relay outputs:
• C
aution (factory-set to trip at 9 ppm)
• Warning (factory-set to trip at 29 ppm)
• Alarm (factory-set to trip at 700 ppm)
Each r
elay can be set up as latching/non-latching and/or normally-
energized/normally de-energized. Contacts are Form C at 240 Volts AC
8 amps resistive. Connect wiring to Terminal Strip J29. User can adjust
alarm trip points via the front panel (see Section 3, FIGURE 3-13).
NOTE: R
esponse time equals 90% of a step change and alarm
condition within 110 seconds.
Alarm R
elay Connections Wiring
Three r
efrigerant level alarm relay outputs are provided. All alarm relays
are Form C, SPDT relays which can be
wired to either closed or opened
contacts in an alarm condition.
Each r
elay has contacts for:
• N
ORMALLY OPEN (NO)
• COMMON (COM)
• NORMALLY CLOSED (NC)
The f
unction of each relay connector terminal is shown on FIGURE 2-5.
Relay w
iring should enter the unit through one of the openings on the
right side of the unit. Connections are made at the internal terminal strip
labeled J29, located on the right side of the circuit board (FIGURE 2-5).
The terminal portion of the connector can be unplugged from the circuit
board for easier wire connections.
NOTE: Th
e maximum wire size that these connectors can accept is
#12 AWG.
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