Description
The MRCOOL UHP18048-O is the 4-ton outdoor heat pump unit of the Universal Series line. Matched with the UAH18048-O air handler it is AHRI certified (Reference No. 217730331) at 17.5 SEER2, 12 EER2 and 9.5 HSPF2, with 48,000 BTU/h of rated cooling and 48,000 BTU/h of heating at 47°F on R-454B refrigerant.
The outdoor unit runs a DC inverter rotary compressor that modulates with the load, and it comes with a chassis heater and crankcase heater as standard equipment for dependable starts in deep cold. The black side-discharge cabinet keeps a low profile next to the house.
MRCOOL rates the Universal Series for up to 100% heating output at -13°F with continuous heating operation down to -22°F, and full cooling output at 110°F with operation up to 122°F, which makes it a true all-climate heat pump.
Electrical and piping
The unit runs on 208/230V single phase with a 38 A minimum circuit ampacity and 40 A maximum overcurrent protection. It uses a 3/8 in liquid line and 3/4 in suction line, ships charged for 24.6 ft of line set, and supports runs up to 246 ft (75 m) with 98.4 ft (30 m) of lift. It measures 38.58 x 16.34 x 38.39 in and weighs 201.50 lbs.
Replacing just the outdoor unit
The ratings above apply only when this condenser is paired with the UAH18048-O. If you are replacing a failed outdoor unit on an existing Universal Series system, match the model to your air handler before ordering. MRCOOL covers the compressor and parts for 10 years and labor for 2 years when the system is professionally installed.
Key Features
- Inverter compressor: Variable-speed DC inverter for steady comfort and lower energy use
- R-454B refrigerant: Current low-GWP refrigerant
- Side discharge: Compact cabinet that fits tight side yards
- Cold-weather package: Chassis heater and crankcase heater standard
Frequently Asked Questions
Which air handler does this condenser match?
The UAH18048-O. That pair is the AHRI-certified combination (No. 217730331).
What size breaker does it need?
MRCOOL lists 38 A minimum circuit ampacity and 40 A maximum overcurrent protection on a 208/230V single-phase circuit.
What line set does it use?
3/8 in liquid and 3/4 in suction, charged for 24.6 ft. Add 0.7 oz of R-454B per additional foot, up to 246 ft (75 m).
Does it need a professional installer?
Yes. It must be piped, evacuated and charged by a licensed HVAC contractor. Local codes and efficiency requirements vary, so have your installer confirm the unit for your area.
