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MerlinGuard Chiller Room Refrigerant System

Up To 16 Remote Detectors With MODBUS Capabilities

MerlinGuard

The MerlinGuard is a 16 zone detection panel. Up to 16 detectors can be used in any combination and can be individually monitored on the MerlinGuard TFT display.

The MerlinGuard is a gas detection panel designed by American Gas Safety (AGS) to be used with AGSRTFT detectors. It is intended for use in refrigerating machinery rooms and provides features such as fan control options, alarm damper control, and connectivity to Building Management Systems (BMS). The panel has four output options for pre-alarm and high-alarm conditions, and it also contains a 0-10V output that can be utilized by the BMS or for fan control via VFD. The MerlinGuard is a compact and versatile solution for gas detection in refrigerating machinery rooms, providing comprehensive features to meet the requirements and guidelines for refrigerant codes.

The MerlinGuard is designed to be an off the shelf product to comply with ASHRAE 15 machinery room guidelines by ventilating, alarming, and requiring a manual reset after alarm.

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Merlin Refrigerant Gas Detector TFT

The Merlin Refrigerant Detector-TFT is an NDIR detector and is typically used as a standalone unit or in conjunction with a Merlin controller. Each of the available Merlin refrigerant target gases are heavier than air and will therefore drop, meaning the gas sensor should be mounted 12 inches from the floor of the protected area. At detection, the detectors will go into alarm at 1000ppm. When connected to a Merlin controller, built-in alarm relay outputs can be used to activate the power supply to a remote audible alarm and activate ventilation fans. This can then be rectified by resolving the leak, allowing the sensor head to clear and resetting the attached Merlin panel and detector.

For further information on our Merlin gas detectors please refer to our product data sheet.

Refrigerant Gases Available

Other gases available upon request.

Sounder/Visual Alarm Strobe

• 24V powered.
• Dip Switches allow the Sounder Alarm Beacon to be tailored to user’s needs.
• Easily connected to all our AGS Gas Detection Systems.
• Easy Installation
• Covered by American Gas Safety 3 Year Warranty.

Code Requirements

8.9 Refrgierating Machinery Room, General Requirements.

When a refrigerating system is located indoors and a machinery room is required by section 7.4, the machinery room shall be in accordance with the following provisions.

8.9.5 Each refrigerating machinery room shall contain a detector, located in an area where refrigerant from a leak will concentrate, that actuates an alarm and mechanical ventilation in accordance with Section 8.9.7 at a set point not greater than the occupational exposure limit (OEL) value as published in ASHRAE 34. For refrigerants that do not have a published OEL value in Standard 34, a set point determine in accordance with OEL as designed by Standard 34 shall be approved by the AHJ. The alarm shall annunciate visual and audible alarms inside the refrigerating machineryr room and 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 hte refrigeranting machinery room. Alarms set at other levels (such as IDLH) and automatic reset alarms are permitted in addition to those required by this section. The meaning of each alarm shall be clearly marked by signage near the annunciators.

608.9

Machinery rooms shall be provided with a refrigerant detector with an audible and visual alarm. Where ammonia used as the refrigerant, detection shall comply with IIAR 2. For refrigerants other than ammonia, refrigerant detection shall comply with Section 608.9.1.

608.9.1 Refrigerants other than ammonia.

A detector, or a sampling tube that draws air to a detector, shall be provided at an approved location where refrigerant from a leak is expected to accumulate. The system shall be designed to initiate audible and visible alarms inside of and outside each entrance to the refrigerating machinery room and transmit a signal to an approved location where the concentration of refrigerant detected exceeds the lesser of the following:

1) The corresponding TLV-TWA values shown in the International Mechanical Code for the refrigerant classification.
2) Twenty-give percent of the lower flammable limit (LFL)
Detection of a refrigerant concentration exceeding the upper detection limit or 25 percent of the lower flammable limit (LFL), which is lower, shall stop refrigerant equipment in the machinery room in accordance with Section 608.10.1.

608.9

Machinery rooms shall be provided with a refrigerant detector with an audible and visual alarm. Where ammonia used as the refrigerant, detection shall comply with IIAR 2. For refrigerants other than ammonia, refrigerant detection shall comply with Section 608.9.1.

608.9.1 Refrigerants other than ammonia.

A detector, or a sampling tube that draws air to a detector, shall be provided at an approved location where refrigerant from a leak is expected to accumulate. The system shall be designed to initiate audible and visible alarms inside of and outside each entrance to the refrigerating machinery room and transmit a signal to an approved location where the concentration of refrigerant detected exceeds the lesser of the following:

608.10.1 Refrigeration system emergency shutoff.

A clearly identified switch of the break-glass type or with an approved tamper-resistant cover shall provide off-only control of refrigerant compressors, refrigerant pumps and normally closed automatic refrigerant valves located in the machinery room. Additionally, this equipment shall be automatically shut off when the refrigerant vapor concentration in the machinery room exceeds the vapor detector’s upper detection limit or 25 percent of the LEL, whichever is lower.

608.10.2 Ventilation System

A clearly identified switch of the break-glass type or with an approved tamper-resistant cover shall provide on-only control of the machinery room ventilation fans.

Product Literature

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