MVR-300 VRF Refrigerant Gas Detector

• Fits in standard 3-gang electrical boxes for easy installation
• Low profile / flush mount for aesthetically non-intrusive appearance
• Two relays and Modbus Communications for notifying building management & initiate counter measures
• Alarm options (LED, buzzer, two levels, configurable delay and fail-safe) to alert occupants and remotely
  inform building management of alarm location for rapid response as required
• Refrigerant specific sensors for enhanced safety
• Self diagnostics and simple field calibration for easy maintenance
• Unique plug-in field replaceable pre-calibrated sensor for low cost of ownership

The MVR-300™ VRF Refrigerant Gas Detector is specifically designed to provide continuous monitoring for 
refrigerants associated with high-efficiency, high volume refrigerant cooling and heating systems, such as VRF / 
VRV (Variable Refrigerant Flow/Variable Refrigerant Volume) systems. Typical applications include hotels, 
dormitories, hospitals, office buildings, and apartment buildings. 

The MVR-300™ audible and visual alarms alert occupants and simultaneously communicate to Building 
Management Systems/Building Automation Systems (BMS/BAS). Two on-board relays can be used to close valves, 
activate alarm devices and exhaust fans or initiate emergency calls to rescue teams.

The on-board Modbus RTU interface provides real-time information about concentrations, status and settings. It 
also enables custom configuration of the MVR-300™ to any application specific requirements using multiple 
Modbus registers.

The MVR-300™ is designed for easy installation and simple maintenance.

IMPORTANT NOTE: Large refrigerant leaks into occupied spaces can reach concentrations that pose a suffocation 
risk to the occupants. The MVR-300™ is not designed to be used as the sole safety device for this risk. Safety of 
the occupants also must take a system designed approach that includes things such as ventilation, detection, early 
warning, mitigation and design redundancy.

Detectable Gases			     R-410A, R-407C, R-404A, R-32

Measuring Ranges			        2,500 ppm, 5,000 ppm, 10,000 ppm

Housing					Flush mount, white ABS, fits in most 3-gang electrical back-boxes

Size (L x W x D, approx.)		        6" x 4.1" x 1.75" (150 x 105 x 45 mm) including bezel

Protection				        Indoor: IP40, NEMA 1

Weight (approx.)			        8 oz (230 g)

Power					        100 to 240 VAC, 50/60 Hz, 4 W max.

Indicator				        Tri-color LED: green, amber, red

Buzzer					80 dB at 12" (30 cm)

Relay					        Two SPDT: low alarm and high alarm / fault, normal or fail-safe; configurable

Relay Rating				        1 A at 30 VDC; 1A at 125 and 250 VAC, resistive load

Alarm Delay				        0 to 15 minutes; configurable 0, 5, 10, 15

Wiring					Power: 3-core cable, 14 to 20 AWG (0.5 to 2.0 mm2)
					        Relay: 3-core cable, 18 to 20 AWG (0.5 to 1.0 mm2)
					        Modbus: 2-core twisted pair shielded cable 18 to 24 AWG

Modbus RTU				        Baud Rage: 9,600 or 19,200; configurable

Environmental Conditions		Operating Temperature: 32 to 120°F (0 to 50°C)

Storage 				        Temperature: 5 to 100°F (-20 to 40°C)
					        Humidity: 5 to 90% RH, non-condensing
					        Pressure: 23.6 to 32.5 inch of Hg (800 to 1,100 hPa)

Elevation				        0 to 6,560 ft. (2,000 m) altitude

Sensor life				        2 year minimum life with recommended 6 month testing and/or recalibration

Approvals				        CE, UL/CSA/IEC/EN 61010-1