Mitsubishi Heavy Industries FD-PAC, Technical Manual

3.2 Installation 

FD-PAC 

 
All the required components for the FD-PAC in accordance with this delivery will be connected to the 
terminal on the FD-PAC. 
The control kit can be switched on/off via an external 230V AC signal. Due to the invertercontrol of the 
outdoor unit it is recommended to control an external fan via the connections of the FD-PAC. See the 
attached wiring diagram (chapter 3.5). For further information regarding safety and protection systems 
please refer to the applicable MHI technical manual. 
 
Connector CNT must be used in combination with optional equipment like the Cool-sign in. Damage 
can occur if incorrect power is applied. 
 

1.  The control box must be installed on an appropriate location close to the heat exchanger; 
2.  Installation piping outdoor unit-heat exchanger: Please refer to the applicable installation 

instructions/technical manual of the equipment; 

3.  Install filter/dryer (bi-flow) in the liquid line; 
4.  Install the electrical wiring in accordance with the wiring diagram. Please refer to the 

applicable installation instructions/technical manual of the equipment; 

5.  When using the control kit in combination with cold water equipment via plate heat exchangers 

there must be a minimum of 15% glycol in the system. 

6.  Positioning of the temperature sensors on the heat exchanger: 

 
Thi-R1 –  Install this sensor at approx. 80% after entrance (mode cooling) of heat exchanger.                 
Thi-R2 –  Install this sensor at the entrance (mode cooling) of heat exchanger. 
Thi-R3 –  Install this sensor at the exit (mode cooling) of heat exchanger. 
Thi-A   –  Install this sensor on an appropriate location in the return air or in the applicable room. A 
               free flow of air is required must be guaranteed! 
 

Caution: Tighten the sensors sufficiently and apply insulation around the sensor! This to 
guarantee a correct temperature measurement and to prevent severe damage to the 
equipment! 
 

7.  The estimated output needs to be adjusted via DIP switch SW6 of the PCB on the FD-PAC in 

accordance with this tabel: 

Caution: The commisioning needs to be performed in accordance with commissioning protocol 
regarding fluorized gas regulation and Kyoto protocol and local regulations. 
 

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