Appendix 4 Refrigerant, Hydraulic And Electrical Connections 63
Liebert.CRV Series Air Conditioner User Manual
7) Customer alarm inputs - Terminals for field supplied, normally closed contacts, having a minimum 75VA, 24VAC
rating, between terminals 61 & 63. Use field supplied Class 1 wiring.
8) General alarm - On any alarm, normally open dry contact is closed across terminals 400, 401 for remote indication.
2A, 24Vac Max. load. Use Class 1 field supplied wiring.
9) Warning alarm - On any alarm, normally open dry contact is closed across terminals 300,301 for remote indication.
2A, 24Vac Max. load. Use Class 1 field supplied wiring.
10) Compressor motor on - On any call for compressor operation, normally open dry contact is closed across
terminals 72 & 73, 2A, 24Vac Max. load. Use Class 1 field supplied wiring.
11) Fan motor on - On any call for fans operation, normally open dry contact is closed across terminals 70 & 71. 2A,
24Vac Max. load. Use Class 1 field supplied wiring.
2. Optional electrical connections
12) Smoke sensor alarm (with smoke sensor option) – The smoke sensor is factory installed, and senses the delivery
air; it is connected across terminals 61 & 62 and send a visual and an audible alarm. This smoke sensor is not
intended to function as, or replace, any room smoke detection system that may be required by local or national codes.
1A, 24Vac Max. load. Use Class 1 field supplied wiring.
14) Condensate alarm (with condensate pump option) - On pump high water indication, normally open dry contact is
closed across purple wire for remote indication install inside the box near the pump. 1A, 24Vac Max. load. Use Class
1 field supplied wiring.
3. Optional low voltage terminal package connections
15) Flooding alarm (liquistat) – The flooding alarm detects the presence of water and activate an alarm. The sensor is
connected across terminals 105 & 106 and up to five sensors can be connected to the same flooding alarm device to
control many points in the bottom of the unit.
4. Electrical connections for maintenance
16) Switch mode power supply – 220Vac input, 12Vdc output. It can supply power for remote large display panel. The
switch is off by default, and can only be used during maintenance. When maintaining the unit, the maintenance
personnel can connect a large display panel to the unit rear part. Through the display panel, all functions of the
controller can be used, facilitating maintenance. After the maintenance, please switch off the switch mode power
supply.
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