0906-E
25
CUSTOMIZED INPUT / OUTPUT (BE.50)
Function
With the optional expansion board BE.50, it is possible to customize some input / output for remote control of
the unit. So it is possible to customize:
• 4 digital outputs NC or NO (connectors J5, J6, J7, J8) set up with parameters 3851, 3852, 3853 and
3854
• 4 digitals inputs (connectors J4 ID1, ID2, ID3, ID4) set up by parameters 3861, 3862, 3863 et 3864
• 4 analogical inputs (4-20mA or Lennox NTC temperature probe on connectors J9 B1, B2, B3 and
B4), set up with parameters 3871, 3872, 3873 et 3874
Description
So it is possible to set up the following functions:
With 3851, 3852, 3853 and 3854 - digital output NC or NO free contacts - following information could be
recovered on each contact:
• Fault fans or pumps or water flow or circuit 1, 2, 3 or 4.
• Heating mode
• 100% on Circuit 1, 2, 3 or 4
• Unit fully loaded – 100%
• Unit-ON
• Unoccupied mode operation
• Zone A, B ou C
• BMS mode
With 3861, 3862, 3863 and 3864 - digital input 24V AC or DC – following orders can be sent on each
contact:
• Switch water set point (set point 1 / set point 2)
• Force Heating mode
• Force Cooling mode
• Disable circuit 1, 2, 3 or 4.
• Force unoccupied mode
With 3871, 3872, 3873 and 3874 – analogical input 4-20mA or Lennox NTC probe (J9 B1, B2, B3 and B4) –
It is possible to make the following actions:
• Set point offset(*)
• Free temperature probe connection. The measured value will be displayed on following addresses
2191, 2192, 2193 or 2194.
(*) The 4-20mA signal sent to the unit is converted linearly using a -5K to +5K range of temperature set point.
For example:
For a unit set point of 7°C supply temperature, a 20mA signal will give a 12°C return temperature set point.
In any case, with a unit running with clear water, the chilled water supply temperature set point CAN NOT be
adjusted to a value below 6°C.
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