PRELERT
Chiller Over-Pressurization Alarm System
A sound solution to preventing catastrophic refrigerant loss.
Positive-pressure chillers contain relief valves
and negative-pressure chillers contain rupture discs or rupture
disc/relief valve assemblies. These devices have, on occasion,
accidentally vented refrigerant due to unintentional over-pressurization.
When this occurs, the result is usually a partial or total loss
of the chiller's refrigerant charge. It can also result in a
non-operational chiller, not to mention the lack of proper record
keeping for the EPA. Now you can take action to prevent this
potential disaster by using the PRELERT (Pressure Alert) Chiller
Pressurization Alarm System.
The PRELERT system is a fully automated early warning
alarm for idle chillers that notifies operating personnel of impending
catastrophic refrigerant loss due to high-pressure conditions.
Additionally, the PRELERT system can even initiate corrective
control measures. Best of all, PRELERT can be used with all CFC,
HCFC* and HFC refrigerants.
A high-pressure switch is installed on the evaporator
of the chiller. This switch is connected to the PRELERT system's
circuitry for continuous monitoring of its status. If critical
pressures are reached, the circuit trips, an audible alarm sounds
and flashing lights call attention to the chiller. The alarm
status signal can also be transmitted to a building automation
system. The audible alarm will continue to sound until the pressure
is reduced to a safe level and the "Silence Alarm" button
is manually reset. An alarm memory circuit indicates how long
a high-pressure condition existed. Any peripheral equipment wired
to the auxiliary contacts will de-energize during an alarm condition.
PRELERT Alarm can also be upgraded to PRELERT Safe-Connect
and PRELERT Disconnect.
Features | Benefits |
Visual and audible alarm. | Provides warning of chiller over-pressurization. |
Interlocking auxiliary contacts with peripheral equipment. | Initiates corrective action when in alarm mode. |
Allows for corrective action before chiller over-pressurization occurs. | Prevents refrigerant loss. |
*Carrier does not recommend the use of HCFC-123.
PRELERT is a trademark of Mechanical Ingenuity Corporation.