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Connector
Input
Type
Description
J22
NO6
On/off
AHU operating feedback
C6
Shared
J23
NO7
On/off
Danger fault summary relay
C7
Shared
J24
NO8
On/off
Maintenance faults summary relay
C8
Shared
J25
DI7H
Not used
DI7
On/off
Air intake fan control
DI7C
Shared
DI8
On/off
Extraction fan control
DI8H
Not used
J26
Y4
0-10V
Exhaust fan control
Y5
0-10V
Rotary heat exchanger speed control or plate heat exchanger bypass servomotor
control
U11
On/off
Changeover thermostat
GND
Shared
U12
0-10V
Heat recovery unit differential pressure OR exhaust duct pressure
GND
Shared
DI9
On/off
Rotary heat exchanger check
DI10
On/off
Electric heaters 1 and 2 fault summary
DI9C
Shared
J27
NO9
On/off
External generator (heater or cooler)
C9
Shared
NC9
Not used
NO10
Not used
C10
Not used
NC10
Not used
J28
C11
+24 Vac power supply
NO11
On/off
Electric heater stage 1 control
NO12
On/off
Electric heater stage 2 control or preheater control
NO13
On/off
Pump 2 control
C11
+24 Vac power supply
Assignment of pressure and temperature sensors, depending on the unit type
Unit type
39HXE
39HXC
39HXV
Supply air temperature sensor
J2-U3
J2-U3
J2-U3
Return air temperature sensor
J2-U2
J3-U4
J3-U4
Fresh air temperature sensor
J3-U4
J2-U2
J2-U2
Intake fan pressure sensor
J4-U7
J4-U7
J5-U9
Exhaust fan pressure sensor
J5-U9
J5-U9
J4-U7
Intake filter fouling pressure sensor
J4-U6
J5-U8
J5-U8
Exhaust filter fouling pressure sensor
J5-U8
J4-U6
J4-U6
Customer terminals
The following inputs/outputs are provided for the customer's use, to remote control the machine and/or report the AHU's status. This
information is fed to unit terminal strips Xf18 and Xf22:
PLC terminals
Customer
terminals
Function
Type
J22-NO6/C6
Xf18-1/2
AHU operating feedback
Dry contact output (250 Vac, 1A resistive load, 1A
inductive load with cosφ=0.6)
J23-NO7/C7
Xf18-3/4
Danger fault summary relay
Dry contact output (250 Vac, 1A resistive load, 1A
inductive load with cosφ=0.6)
J24-NO8/C8
Xf18-4/5
Maintenance faults summary relay
Dry contact output (250 Vac, 1A resistive load, 1A
inductive load with cosφ=0.6)
J5-U10/GND
Xf18-6/7
Setpoint 1/Setpoint 2 changeover
Dry contact input, not optically isolated
J7-DI3/GND
Xf18-8/9
Remote control
Dry contact input, not optically isolated
J7-DI4/GND
Xf22-9/10
Fire detection
Dry contact input, not optically isolated
2 - THE CONTROL PLC
7
Summary of Contents for 39HXC
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