The GE Universal Fit 4-ton packaged heat pump rooftop unit (catalog GC905, chassis ZHD048S5B) provides reverse-cycle heating and DX cooling in a single packaged curb unit. It suits electrification and shoulder-season efficiency jobs where a heat pump RTU is specified.

Configured for 460V, 3-phase, this model includes a 1 HP blower (Z02 drive) and supports optional electric heat for backup/defrost and cold-climate design loads. Confirm electric heat kit sizing for the climate and building load — heat pump capacity alone may not carry design winter conditions.

Universal Fit footprint, heavy-gauge cabinet, and full-perimeter base rails support replacement work on common commercial curbs. Current packaged models use R-454B with factory refrigerant detection. Pair with the correct economizer, outdoor-air, and electric heat accessories for the A-BOX cabinet.

Key features:

• 4-ton packaged heat pump rooftop; chassis ZHD048S5B

• 460V, 3-phase; optional electric heat

• 1 HP blower (Z02 drive)

• Reverse-cycle heat pump operation with DX cooling

• R-454B refrigerant; factory RDS

• Scroll compressor circuit; all-aluminum outdoor coil construction

• Shipped downflow; field-convertible to horizontal airflow where applicable

• Full-perimeter base rail with forklift slots and rigging holes

• Select electric heat kit and curb/economizer accessories by A-BOX cabinet