14
CONNECTING OF THE AUXILIARY DEVICES
C
HILLING SOURCE FAILURE ALARM
For the unit equipped with cooler (both water or DX) you can connect a binary signal informing about general failure of
the cooling medium source (chiller or DX compressor). If such alarm is triggered, the control application of the Air Handling
Unit disengages the cooling mode (unit will remain running, with no cooling function). Follow the Figure 20 to link the cooling
medium source with the AHU controls. Communication cable is not supplied.
Figure 20 - Cooling medium source failure status binary signal
DX
C
OMPRESSOR COMMUNICATION FIR AIR COOLING FUNCTION ONLY
For the DX coil supplied from DX compressor supporting summer operation (cooling function) only, follow below steps.
DX
COMPRESSOR ANALOG CONTROL SIGNAL FOR COOLING MODE ONLY
For DX compressor enabling smooth capacity control for cooling mode only, a 0-10V communication between AHU
and compressor can be established. Connect the analog input of your DX compressor (0-10V standard) to the Cooling
port, terminals G0, Y3 (Figure 21). Communication cable is not supplied.
Figure 21 - 0-10 V analog signal output for DX compressor
– cooling mode only
DX
COMPRESSOR FAILURE ALARM
For the AHU with DX coil, a signal informing the AHU about the compressor failure can be input. If such alarm is triggered,
the AHU disengages the cooling function (depending on the mode). However, the AHU will keep running. Follow the Figure
22 to link the cooling medium source with the AHU controls. Communication cable is not supplied.
