Marketing InformationThe TrueZONE® HZ221 panel is for single stage heat pumps with auxiliary heat applications for up to two zones at 24 V. It features robust push terminals, common sense LEDs, variable speed fan control and leaves a smaller environmental footprint. This TrueZONE® HZ221 panel is for use with single stage heat pumps with auxiliary heat applications, up to two zones. Operating at a maximum voltage of 24 V, it comes with auto changeover and a resettable fuse.