C325H: HITACHI
Hitachi Compatibility: RPI XX 1SQ series & RPI XX 2SQ
Can use RA, Zones, Master or RF as controlling sensor
Polarity is not critical
Connect a shielded, 2 core, twisted pair control cable from the C225 / C325H to the A / B terminals and earth in the in the fan coil unit. (This cable is supplied by the installer)