2. Hazards
Toxic Gas(es)
• Ammonia (NH3) refrigerant used to chill and create ice surface
• Carbon Monoxide (CO) from gasoline, propane, or natural gas powered vehicles
• Nitrogen Dioxide (NO2) from diesel powered vehicles
Combustible Gas
• Natural gas (CH4) or Propane (C3H8) used to power Ice Resurfacing machine
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3. • Refrigerant room must have a detector that actuates an alarm and
ventilation at a level no greater than the TLV-TWA
• The alarm shall annunciate visual and audible alarms inside the
machinery room, and at each entrance to the room
• Ability to activate ventilation fans from immediately outside the
mechanical room
• Alarms can only be acknowledged from inside the mechanical room
• Exhaust fans can only be shut off from inside the mechanical room
• Ability to shutdown any combustion processes (boilers, etc.) from
immediately outside the mechanical room
• Ventilation fans shall be on a separate electrical circuit
ASHRAE 15/CSA B52 General Code Requirements
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4. • A sensor for each chiller, specific to the refrigerant
• Electrochemical sensors are most commonly used for ammonia
• A central monitor to power the sensor(s) and provide ventilation and
alarm controls
• Monitor should be installed inside the mechanical room per code
• This facilitates wiring for required fan/control interlocks
• A module inside the mechanical room that can start/stop fans
• Can be a separate module or integrated into the controller (AMC-RAM-4X1)
• An alarm module at each entrance that can start fans
• Includes audible and visual alarms (AMC-RAM-4X2)
What to Use
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5. • A low alarm (typically 25ppm for NH3) should:
• Initiate ventilation
• Initiate audio/visual alarms
• Notify supervised area of a leak
• Shut down any combustion processes in the mechanical room (boilers)
• Instigate refrigerant leak procedures and/or corrective measures
• A high alarm (typically 35ppm for NH3) should:
• Shut down chiller to minimize refrigerant loss
• Initiate evacuation of personnel from the mechanical room
Recommended Sequence of Operation
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6. Single or Dual Channel Monitor
• Accepts up to 2 x 4-20mA Transmitters
• 110 VAC Power
• Rugged Steel Enclosure
• Dual 10A DPDT Alarm Relay
• Dedicated Latching Ventilation Relay
• User Selectable Minimum Run Timer
• Integral 85db Audio Alarm
• CSA Approved
AMC-1AREF
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7. AMC-1400 (4 Channel Analog Monitor)
• Accepts up to 4 x 4-20mA Transmitters
AMC-1800 (8 or 16 Channel Analog Monitor)
• Accepts 8/16 x 4-20mA Transmitters
AMC-1DB1-X-REF (Digital Monitor with BACnet IP/MSTP Interface)
• Accepts multiple 4-20mA Transmitters using Analog Input Modules
• 110 VAC Power
• Dedicated Latching Ventilation Relay
• User Selectable Minimum Run Timer
• Integral 85db Audio Alarm
• CSA/CSA USA Approved
Other Monitor Options
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9. What To Use – Arenas CO & NO2
For Carbon Monoxide & Nitrogen Dioxide analog
sensors we recommend:
• AMC-1228-28s for applications with NO2 only
• AMC-1228-20s for applications with CO only
• AMC-1222 for applications with CO and NO2
For Carbon Monoxide & Nitrogen Dioxide digital
sensors we recommend:
• AMC-400-CO
• AMC-400-NO2
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10. What To Use – Arenas Combustibles
For Propane or Methane detection we typically recommend:
• AMC-CSA-CAT Analog Transmitter
• AMC-DTR-CAT Digital Transmitter
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11. Remote Audio/Visual Alarms
• Available Concentration Display(s)
• 24VDC Power
• Weatherproof FRP Enclosure
• Integral 85db Audio Alarm
• Acknowledge Switch for Audio Alarm
• Configurations for Inside or Outside Mech. Room
• Variants with Fan Start or Fan Start/Stop
AMC-RAM-4
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