TOXALERT GUIDE SPECIFICATION
Provide a Toxalert model Tox-Refrig refrigerant leak detection and control system as specified.
The refrigerant sensor(s) shall have a 4 to 20 mA output signal over its (0-500) PPM range. When a sensor malfunctions it shall signal the controller for annunciation of sensor failure.
The controller/annunciator Model Tox-Refrig shall be designed to be mounted outside of the mechanical room and shall have two (2) modes of control with two (2) levels of indication for each sensor input. The first mode, "warning," shall start the mechanical room ventilation equipment. The second mode, "alarm," shall light a red alarm light and sound the audible alarm port of the alarm. The audible alarm after being silenced, shall automatically reset and sound again at the next alarm occurrence. There shall be a light emitting diode (LED) for each refrigerant sensor to indicate warning stage, alarm stage, or sensor malfunction.
Per ASHRAE Std. 15-1994, there shall be a "purge" switch mounted on the face of the controller. The switch shall over-ride automatic control and manually activate the warning stage and ventilation equipment.
The controller shall have dry relay contacts for both the warning and alarm stages to control ventilation equipment and or interface to the facility EMS.
The controller panel front shall include the following labeled indicator lights and control switches:
The sensor shall be housed in an explosion proof housing and have two meter terminal connections on the face of the unit for ease of checking unit calibration.
The refrigerant leak detection system shall be as manufactured by Toxalert International, Inc. or approved by this specifying engineer.
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