Standard Input/Output - Lennox CLIMATIC 50 User Manual

STANDARD INPUT/OUTPUT

Function
The Climactic™50 main board (BM.50) offers free dry contacts to control the unit. These free dry contacts are
connected directly to terminals (orange colour) identified as follow:

[824 - 825] : 24V relay customers power supply (Option),

[826 - 827] : 24V power ON the unit (Option),

[804 - 805] : Remote alarm reset (NC = Enable Reset),

[808 - 809] : Water evaporator customer flow switch,

[890 - 891] : Remote ON / OFF of the unit.
 [870 – 871 - 872] : Alarm relay (NC = Alarm OFF).
Connection
The following figure described how to connect the free dry contacts of Climactic™50.
For the contacts [824 - 825] and [826 - 827], refers to the electrical diagram.
890
891
CLIMATIC™50 – Chiller / Heat Pump – Customer version
CL50-CHILLER-IOM_CUST-0808-E
Remote ON / OFF
Open = Unit OFF
Closed = Unit ON
804
805
 The reset is enable only on a
positive front edge of the signal
808
809
Remote Reset Alarm
Open = Reset OFF
Closed = Reset ON
( ).
Water Evaporator Flow Switch
Open = Flow OFF
Closed = Flow ON
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