4
Alarm Relays
The VAS - 4 has three alarm relay outputs. The alarm relays do not
become active until the delay timer times out, which causes the latch alarm
indicator to become active. The three alarm relays are general purpose
and can be used for exterior alarms, load switching or phone monitoring.
Note: Do not exceed relay specifications.
High Alarm Relay
The High Alarm relay becomes active from a high alarm condition after the
delay timer times out. This relay stays active as long as the alarm condition
exists. Once the alarm condition goes away, this relay becomes inactive.
Low Alarm Relay
The Low Alarm relay becomes active from a low alarm condition after the
delay timer times out. This relay stays active as long as the alarm condition
exists. Once the alarm condition goes away, this relay becomes inactive.
Latch Alarm Relay
When either the High or Low Alarm relays become active and the delay time
is over the latch alarm relay also becomes active. This is indicated by the
Latch Alarm indicator. This relay stays active until the manual reset button is
pushed (see Fig. 2).
NOTE:
In some applications, like gas chlorination in water and wastewater
treatment, special attention needs to be given to the electrical hookup. If your
vacuum source under normal operation is cycled on and off, as is the case
when the vacuum is created only when a well pump is operating, then the
AC power to the VAS - 4 should be switched on and off with the well pump.
This will prevent a low alarm condition when the pump is off.
Section 5
Installation
Installation should only be performed by a licensed electrician. Follow any
local, state or other applicable codes that apply when installing this unit.
THIS UNIT SHOULD BE WIRED TO A GROUND FAULT RECEPTACLE.
CAUTION: HIGH VOLTAGE COULD EXIST INSIDE THIS UNIT.
DISCONNECT ALL POWER BEFORE INSTALLATION.
