Craig Wolfe Toxalert International, Inc. Mound, MN

Craig Wolfe Toxalert International, Inc. Mound, MN

Codes & Standards Technologies & Locating Sensors System Maintenance

Codes and Standards ANSI/ASHRAE 15-2007 International Mechanical Code (IMC) 2006 International Fire Code (IFC) 2006

Codes and Standards ANSI/ASHRAE 15-2007 Safety Standard for Refrigeration Systems

ASHRAE 15-2007 Forward Care should be taken to avoid stagnant pockets of refrigerant vapors by proper location of ventilation inlet and exhaust openings. All machinery rooms are required to have detectors that will activate an alarm and mechanical ventilation at a value not greater than the corresponding TLV-TWA. Informative Appendix I provides guidance on integrating the requirements of this standard with occupational health & safety programs.

ASHRAE 15-2007 8.11 Refrigerating Machinery Room, General Requirements. 8.11.2.1 Each machinery room shall contain a detector, located in an area where refrigerant from a leak will concentrate, that actuates an alarm & mechanical ventilation at a value not greater than the corresponding TLV-TWA (or toxicity measure consistent therewith). The alarm shall annunciate visual & audible alarms inside the refrigerating machinery room & outside each entrance to the refrigerating machinery room. The alarms required in this section shall be of the manual reset type with the reset located inside the refrigerating machinery room..

ASHRAE 15-2007 8.11.6.Combustion equipment shall not be installed in the same machinery room with refrigerant-containing equipment except under one of the following conditions: (a) combustion air is ducted (b) a refrigerant detector, is employed to automatically shut down the combustion process in the event of refrigerant leakage.

ASHRAE 15-2007 8.12 Machinery Room, Special Requirements. 8.12.i. Remote control of mechanical equipment in the refrigerating machinery room shall be provided immediately outside the machinery room door solely for the purpose of shutting down the equipment in an emergency. Ventilation fans shall be on a separated electrical circuit and have a control switch located immediately outside the machinery room door.

Codes and Standards 2006 IMC 1101.6 General. Refrigeration systems shall comply with the requirements of this code and, except as modified by this code, ASHRAE 15. Ammonia-refrigerating systems shall comply with this code and, except as modified by this code, ASHRAE 15.

2006 IMC 1105.3 Refrigerant detector. Refrigerant detectors in machinery rooms shall be provided as required by Sections 606.8 of the International Fire Code.

2006 IMC 1106.5 Remote controls. Remote control of the mechanical equipment and appliances located in the machinery room shall be provided as required by Sections 606.8 of the International Fire Code.

2006 IMC 1106.5 Remote controls. 1106.5.1 Refrigerant system. A clearly identified switch of the break-glass type shall provide off-only control of electrically energized equipment and appliances in the machinery room, other than refrigerant leak detectors and machinery room ventilation.

2006 IMC 1106.5 Remote controls. 1106.5.2 Ventilation system. A clearly identified switch of the break-glass type shall provide on-only control of machinery room ventilation fans.

Codes and Standards 2006 IFC 606.8 Refrigerant detector. Machinery rooms shall contain a refrigerant detector with an audible and visual alarm. The detector, or a sampling tube that draws air to the detector, shall be located in an area where refrigerant from a leak will concentrate. The alarm shall be actuated at a value not greater than the corresponding TLV-TWA values shown in the International Mechanical Code for the refrigerant classification. Detectors and alarm shall be placed in approved locations.

2006 IFC 606.9 Remote controls. Remote control of the mechanical equipment and appliances located in the machinery room shall be provided at an approved location immediately outside the machinery room and adjacent to its principal entrance.

2006 IFC 606.9 Remote controls. 606.9.1 Refrigerant system. A clearly identified switch of the break-glass type shall provide off-only control of electrically energized equipment and appliances in the machinery room, other than refrigerant leak detectors and machinery room ventilation.

2006 IFC 606.9 Remote controls. 606.9.2 Ventilation system. A clearly identified switch of the break-glass type shall provide on-only control of machinery room ventilation fans.

Sensor Technologies Monitoring Systems Locating Sensors

Sensor Technology Common Types Of Refrigerant Leak Sensors Metal Oxide Semiconductor (MOS) Non Dispersive & Photoacoustic Infrared

Sensor Technology MOS SENSOR Heater Coil Sensor Element Pin

Sensor Technology Infrared Sensor LIGHT FILTERS SENSOR CHAMBER LIGHT DETECTOR INFRARED LIGHT SOURCE SIGNAL PROCESSOR

Leak Detection Systems Sampling Systems & Electronic/Diffusion Systems

Leak Detection Systems Sampling System CONTROLLER EXHAUST LINE DRAW PUMP SENSOR SOLENOID VALVES TUBING SAMPLE POINT FILTERS

Leak Detection Systems Electronic/Diffusion System CONTROLLER REMOTE SENSORS

Leak Detection Systems Features Multi-Stage Control LCD Display of Refrigerant Concentration Visual Indicators for Power On Stage of Activation Fault Fan Auto/Purge Switch Audible Alarm With Silence Switch Manual/Auto Warning Stage Reset Switch

Leak Detection Systems Options Analog output (4-20mA or 0-10vdc) Integral strobe RS 232/485 communications for modbus, BACnet

Leak Detection Systems Typical Control CONTROLLER 120VAC FIRST STAGE SECOND STAGE FAULT

Locating Sensors Guide lines to properly locating a refrigerant sensor in an equipment room is: (a) determining the airflow pattern in the room; (b) remembering that occupant safety is the primary motive for installing the sensor; and (c) All commonly used refrigerants except ammonia are 3 to 5 times heavier than air.

Locating Sensors As a Minimum General Guide Locate sensors so no chiller is more than 50 ft. from a sensor.

CHILLER CHILLER CHILLER CHILLER Locating Sensors EXHAUST REFRIGERANT LEAK MONITOR PANEL AIR INTAKE REFRIGERANT SENSOR

CHILLER CHILLER CHILLER CHILLER Locating Sensors EXHAUST REFRIGERANT LEAK MONITOR PANEL AIR INTAKE REFRIGERANT SENSOR

CHILLER CHILLER CHILLER Locating Sensors REFRIGERANT LEAK MONITOR PANEL AIR INTAKE EXHAUST REFRIGERANT SENSOR

CHILLER CHILLER CHILLER Locating Sensors REFRIGERANT LEAK MONITOR PANEL AIR INTAKE EXHAUST REFRIGERANT SENSOR

Leak Monitoring System STROBE/REM HORN/REM SCBA TOX-REFRIG PANEL TOX-REFRIG/ANA CH-1 CH-2 ALM/REFRIG TOX-REFRIG/ANA BOILER STROBE/REM HORN/REM

Maintenance ASHRAE Standard 15 11.6.3 Periodic tests. Detector(s), alarm(s), and mechanical ventilating systems shall be tested in accordance with manufacturers specifications and the requirements of the jurisdiction having authority.

Maintenance 2006 IMC 1109.1 Testing required. The following emergency devices and systems shall be periodically tested in accordance with the manufacturer s instructions and as required by the code official: 1109.1.4 Detection and alarm systems.

Maintenance 2006 IFC 606.6.1 Periodic testing. The following emergency devices and systems shall be periodically tested in accordance with the manufacturer s instructions and as required by the fire code official: 606.6.1.4 Detection and alarm systems.

Maintenance MOS/Diffusion System Periodic Maintenance Sensor calibration

Maintenance Sampling Infrared System Periodic Maintenance Sensor calibration Sample point filters Internal filter

Maintenance Calibration kit

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