CMNET - HVAC Panasonic/Sanyo VRF installation guide Yoram Dagan December 26, 2021 16:10 Updated HVAC Communication TerminalsHVAC outdoor connection * For Heat Recovery systems the connection is at outdoor units only. * Polarity is not required on the HVAC communication line. Connecting to the line plugSecure the cables in the L1 line plug. Plugging to the CoolMasterNetInsert the plug in to the CoolMasterNet L1 socket. Check DIP Switches are set correctlyDip switches setup for VRF HVAC system on L1. Comments 0 comments Please sign in to leave a comment.