Notifier Refrigerant Leak Detection System

REFRIGERANT LEAK DETECTION SYSTEM accordance with ASHRAE 15 2004 and CSA B 52 Mechanical Code 15xxx GENERAL Provide a complete installation of a refrigerant leak detection system including a main control sensors audible visual alarm devices and emergency break glass switches This system can linked to a Controller Unit or to a BAS The system design shall consist of diffusion type sensors and a control unit Sample draw systems sample tubing are unacceptable The system shall include but not be limited to the following expandability of refrigerant gas concentration to modify alarm set points with emergency system shut down and manual fan start stop of alarm status Provide self contained breathing apparatus SCBA as follows PRODUCTS 1 unit will be provided and located immediately outside the mechanical room second backup unit will also be provided EXPANSION UNIT VA301EM A The controller shall provide a 4 20 mA output signal for each sensor corresponding to the refrigerant levels of each sensor In the event of a sensor or controller malfunction controller shall energize an on board fault relay and turn on a fault indicator on the front B The controller shall continuously display the specified refrigerant concentration of each sensor an LCD display The controller shall have a minimum of three levels of activation for each refrigerant level There shall be 3 relays corresponding to three alarm levels The A relay shall be energized and the first alarm Alarm A shall be initiated when the concentration reaches or exceeds the programmed Alarm A level Alarm A shall the mechanical room ventilation equipment The Alarm B relay shall be energized and second alarm Alarm B shall be initiated when the refrigerant concentration levels reach or the programmed Alarm B level Alarm B shall energize an onboard red horn strobe unit to the controller or a remote red alarm horn strobe All relays shall be form C double double throw Dry contacts shall be rated for 5 amps resistive load at 240 Vac The controller shall provide an audible alarm silence button on the front panel to silence the alarm but will automatically reset and sound again at the next alarm occurrence D The controller shall be wall mount type with the following features Enclosure Type The enclosure shall be NEMA 4 type Access to the inside of the and wiring connections shall be through a front facing full length door The door have a window size sufficient to allow viewing of a 2 line by 20 character LCD display Enclosure Size the enclosure shall be no more than 12 inches in any dimension Mounting Provisions mounting brackets for the purpose of attaching the unit to a flat shall not be needed Front Panel Controls a four button keypad and fan start stop and alarm silence buttons provide access to all monitor functions including display calibration set up and Resetting any alarm set point Zero and Span calibration adjustments display of alarm set point level on front panel readout Audible Alarm A 65dBa at 3 feet audible alarm shall be internal to the controller it shall when one of the pre selected alarm conditions occurs No tools or special adapters shall be used for System Power Requirements the system shall operate on 24Vac 2A max BACNET COMMUNICATIONS CAPABILITY Optional BACnet IP communications capability can be provided to connect to the Building System DETECTORS VA301 IRFS A Operating Principal the principal of operation shall be non dispersive infrared type by Analytics Detector sample The detector shall be of diffusion type with no internal sample pump or Detector sensitivity The detector shall be capable of monitoring over a range of 0 1000 with a resolution of 1 ppm Detector accuracy The detector shall be capable of maintaining a response of range 500 ppm Temperature the system shall operate over a range of 0 to 40 degrees centigrade 32 to 104 F Stability the 30 day zero and span drift shall be less than 1 F S without the aid of or manual recalibration The system shall not employ any type of auto zero in order to maintain stability The use of fresh air sources or scrubbers as zero is not permitted Calibration The system must provide a menu driven method of checking both zero and calibrations Any adjustments must be made through the front panel keyboard Maximum distance between the sensor and controller shall not exceed 200 ft 60 m Maximum System Maintenance Requirements The detectors shall require no periodic other than yearly zero and span checking with calibrated zero and span gas checking or adjustments of the unit shall be capable of being accomplished by one at the unit location alarm levels are to be activated and the unit is to be installed in accordance with the parameters CO ALARM POINT ppm ALARM POINT ppm ALARM POINT ppm ft 150 cm above ft 15 m PPM PPM PPM ft 30 cm above per Chiller floor floor Building Codes recommendations have preference over these parameters Coverage can depending on application ACCESSORIES A Strobe and Horn VA 301EM IRFSA or STASR and horn may be integral to the controller VA301EM RFSA or remote STAS remote mounted unit shall be rated at 85dba at 10 feet integral horn strobe unit shall be rated at 90dba at 3 feet B Emergency break glass switches shall be provided glass manual switches shall be equivalent to Honeywell Analytics type EMBG Self Contained Breathing Apparatus must be equivalent to Honeywell Analytics NIOSHSCBA with the ability to be mounted using Honeywell Analytics wall mount case SCBAWALLCASE EXECUTION COMMISSIONING Refrigerant Leak Detection system shall be installed complete and in accordance the manufacturer installation instructions Refrigerant Leak Detection system shall be inspected and commissioned on site by factory trained and authorized Honeywell Analytics technician A factory generated document shall be presented certifying the operation of the unit and the system WARRANTY system shall be warranted by the manufacturer to be free from defects in and materials for a period of one year OF SECTION