User Manual for AGS Merlin Gas Detector i-S

Quick Guide from the Manual

The AGS Merlin Gas Detector i-S is designed for monitoring refrigerant gases (134a, 407c, 410a, 417a, 32). The device is shipped pre-calibrated. Upon installation, it is recommended to perform a bump test to ensure the system is functioning correctly. The device requires a continuous power supply (12-24Vdc or 24Vac) and should be installed by a licensed contractor. The sensor has an expected lifetime of 10 years.

Installation and Mounting

The detector is designed for surface mounting or installation on a 1-gang or 2-gang electrical box. Ensure the wall surface is flat to prevent base distortion. The unit should be mounted where gas is most likely to accumulate, considering the density of the target gas (e.g., low level for heavy gases, high level for light gases). Ensure the rear base is installed in the correct orientation as indicated by the arrows on the base.

Wiring and Connections

The circuit board features pluggable terminals for easy connection. Power can be provided via 12-24Vdc or 24Vac. The board includes specific terminals for power input, alarm relays, and a 0-10V analogue output for external fan speed controllers. A disconnector is required for the 24V supply. Ensure all wiring is restrained to prevent accidental loosening.

Operation

Upon connecting power, the detector enters a 60-second warmup phase. The device features a TFT screen displaying gas levels. Alarm states are indicated by color changes on the screen (Green: Normal, Yellow: Pre-Alarm, Red: Main Alarm). If the alarm relay is latched, a red dot will appear on the screen. To reset the alarm, press and hold the touch sensor for approximately 3 seconds.

Maintenance and Bump Testing

Regular maintenance is required to ensure sensor accuracy. Clean the outer enclosure with a slightly damp cloth; never use detergents, solvents, or aerosols near the device. A 'Bump Test' should be performed every 12-18 months to verify the sensor's response to gas. This involves exposing the sensor to a known concentration of the target gas that exceeds the alarm threshold. If the system fails to trigger an alarm during this test, it must not be used until serviced.

Specifications

The detector operates on 12-24Vdc or 24Vac with a maximum power consumption of 1.8W. It provides dry contact relay outputs (1A switching current). The operating temperature range is -10°C to 50°C. The sensor measuring range is 100-5000ppm, with a pre-alarm at 500ppm and a main alarm at 1000ppm.