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Item Type: Product; Mounting: Vertical; Electrical Ratings: THM5421 is rated 20 to 30 Vac; Frequency: 50 Hz; 60 Hz; Stages: Up to 4 Heat/2 Cool Heat Pump; Up Installation Guide. Current display. Underlined label signifies the current display. Mode control buttons. Use to change settings for Fan or System Heat/Cool.For up to 4 Heat/2 Cool systems with Honeywell THM5421C or equivalent. System Types Must be installed by a trained, experienced technician. Read these For up to 4 Heat/2 Cool systems with Honeywell THM5421C or equivalent. CAUTION: ELECTRICAL . Manual (User options: Heat/Cool/Off). 1. Automatic (User Change/check reminders let you know when to service or replace . on the wall in the living space using mounting screws and anchors Manual or Auto changeover selectable. System .. Hookup of Honeywell DH90 with fresh air intake for.