R-454B components
A refrigerant gas leakage detection sensor and ventilation fans are installed inside the unit
enclosure to avoid potential refrigerant accumulation, if any leak occurs. The sensor is located near
the compressor sets where the piping is most densely arranged.
Figure 18: Two-pipe gas sensor location
Figure 19: Four-pipe gas sensor location
Callout Component Callout Component
A Gas sensor B Ventilation fan
The ventilation fan runs for 60 s when the unit is powered on for the first time, and periodically for
30 s every 24 h. When the refrigerant concentration reaches 25% of low flammable limit (LFL), the
fans start to extract the gas mixture from the enclosure. The unit shuts down, with the exception of
the ventilation fans if the concentration reaches 50% of LFL.
The leakage sensor is a non-dispersive infrared (NDIR) sensor. The sensor is calibration-free and
designed for a lifespan of 15 years.
YMAE Air-Cooled Inverter Scroll Chiller and Heat Pump34
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