Before the power supplies are switched on to the VRF system you must ensure all electrical connections are secure and tight into the terminal blocks. Test the power supply with a true power supply tester or multi meter before the supply is connected to the Mitsubishi Electric equipment. Pay particular attention to ensure the supply has a good Neutral to avoid any damage to the systems electrical components
Powering On the System
3rd
2nd
1st
Powering On the System
The system will take several minutes to initialise. Check the LCD display on the Outdoor unit and Indoor unit controllers for any faults.
- Indoor fan coils
- Outdoor unit/s
- BC Box/s
Once all Electrical connections and voltages have been confirmed, power the system on in the order of :
29-30vdc to MEA Controllers
12vdc to MAA Controllers
24-30vdc (test across M1 to M2)
- TB7 outdoor to centralised controller M-Net voltage
29-30vdc (test across M1 to M2)
- TB3 outdoor to indoor transmission M-Net voltage
Single Phase Units230-240vac Live to Neutral 230-240vac Live to Earth 0-5vac Neutral to Earth
Three Phase Unit Each Phase (L1, L2 & L3) 230-240vac Live to Neutral 230-240vac Live to Earth 0-5vac Neutral to Earth
- Power supply voltage at outdoor unit
Once you have powered the system on you will need to carry out the following voltage checks:
Checking System Voltages
