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5 - INSTALLATION AND INSTALLATION CONNECTIONS
Presence of changeover coil: 2 wires
Machine terminal block
Xm 20 _ b-5
Xm 20 _ b-6
The changeover thermostat must be positioned on the "customer" side of the hydraulic duct, the "fluid into the coil" side (so that it is
in the insulation).
Contact open: normal operation in cooling mode
Contact closed: operation in heating mode (contact closed from 28 °C)
If the unit is equipped with an internal hydraulic coil, coil no. 2 in the additional box must be connected to the fast-on connectors
provided for this purpose. (see additional box terminal block references)
External generator: 2 wires (Choice: heating or cooling)
Machine terminal block
Xm 21 _ b-9
Xm 21 _ b-10
The ON command is given when the heating/cooling demand is true
Supply air and return air damper control: 2 wires
Machine terminal block
Xm 19 _ b-1
Xm 19 _ b-2
Fresh air and exit air dampers control: 2 wires
Machine terminal block
Xm 19 _ b-3
Xm 19 _ b-4
Relay closed = Damper open (relay normally closed)
Relay opened = Damper closed
Fire detection: 2 wires
Machine terminal block
Xm 22 _ b-9
Xm 22 _ b-10
Contact normally closed
AHU operating feedback
Machine terminal block
Xm 18 _ b-1
Xm 18 _ b-2
Pump 1 monitoring: 4 wires
Machine terminal block
Xm 21 _ b-5
Xm 21 _ b-6
Xm 21 _ b-1
Xm 21 _ b-2
Pump 1 ON command if Hydraulic coil 1 operating order
As Xm21 B5-6 is 24 VAC polarised on the Pump1 ON command, provide a 24 VAC relay (50/60 Hz, max 0.75 VA; not supplied by
CARRIER)
28
Notes
C/O thermostat black wire
C/O thermostat white wire
Notes
On/off control
24 VAC
Notes
Damper opening/closing control
24 VAC
Notes
Damper opening/closing control
24 VAC
Notes
Fire detection activation
Dry contact
Notes
AHU operating feedback
Dry contact
Notes
ON command Pump 1
24 VAC
Pump 1 fault monitoring
Dry contact
Inlet/Outlet
Digital inputs
Inlet/Outlet
Digital inputs
Inlet/Outlet
Digital output
Inlet/Outlet
Digital output
Inlet/Outlet
Digital inputs
Inlet/Outlet
Digital output
Inlet/Outlet
Digital inputs
Digital inputs
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