Hitachi RAS-(3-6)HVRNM2E Service Manual page 181

6 Optional functions
COOL or DRY mode at indoor unit. The minimum temperature is -5 ºC.
To activate this option the jumper JP4 of the outdoor unit PCB1 must be cut.
- Alternative defrost mode
When one outdoor unit is connected with one H-LINK system with other outdoor units, is under defrosting, the other
outdoor units defrosting is cancelled.
After one outdoor unit defrosting is completed, another outdoor unit starts defrosting operation.
To activate this option the jumper JP5 of the outdoor unit PCB1 must be cut.
- R407C piping
If you are using conventional R410A refrigerant instead of R407C refrigerant pressure will be increased. To avoid
pressure increase will activate this function.
To activate this option the jumper JP6 of the outdoor unit PCB1 must be cut.
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