Ambient Temperature Sensor; Refrigerant Level Control - Leak Detection Device; Fan Failure - Fan Feedback; Alarm Output (Do5) Of The Xcm25D Controller - Emerson Copeland OMTE-76D Application Manuallines

2.22.2 Ambient temperature sensor

An ambient temperature sensor supplied by Emerson is connected to the electronic controller. This
temperature sensor has several f unctionalities like emergency mode control, lower f an speed
limitation and crankcase heater control.
2.22.3 Refrigerant level control – Leak detection device
The liquid receiver is equipped with an external liquid level watch LW4-L120 from Alco Controls. This
device provides a digital signal to the XCM25D system controller in case of low charging level inside
the receiver. As a result, system leakage can be detected and communicated at a very early stage.
The LW4-L120 device is connected to the digital input DI3 (terminals X1.65/66/67).
2.22.4 Fan failure – Fan feedback
Thanks to the introduction of EC fan technology the XCM25D system controller gets feedback from
the f ans about their condition. In case of f ailure the digital input DI7 (terminals X1.55/56/57) is
activated and a f an alarm is generated.

2.23 Alarm output (DO5) of the XCM25D controller

The digital output DO5 is pre-configured as an alarm contact. The relay (max. 5 A, 250 V AC) is
activated in case of alarms and lockouts. Warnings will be shown only on the controller display.
This setting can be adjusted using parameter S01.
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