Description
Grandaire 3.5 Ton Heat Pump Split System: W5H5S42AKAAA + WCHL425AC
This system pairs the Grandaire W5H5S42AKAAA heat pump with the WCHL425AC multi-position air handler. It is an AHRI-matched combination (AHRI reference 214101897), so the efficiency numbers below were certified for these two exact models working together. Both units are built for R-454B refrigerant and ship with factory TXV metering at the indoor coil.
Certified system performance
- AHRI reference number: 214101897
- Nominal capacity: 3.5 ton (42,000 BTU/h); 41,000 BTU/h certified cooling
- Cooling efficiency: 14.5 SEER2 / 12 EER2
- Heating efficiency: 7.5 HSPF2
- Refrigerant: R-454B
- Power supply: 208/230V 1-phase, 60 Hz
Outdoor unit: Grandaire W5H5S42AKAAA
The W5H5S42AKAAA is a single-stage, 3.5-ton heat pump with a scroll compressor, suction line accumulator, loss-of-charge switch and front-seating service valves. It cools in summer and reverses in winter to move heat into the home, which covers most of the heating season in warm and mixed climates.
- Minimum circuit ampacity: 24.9 A | Max breaker: 40 A
- Line connections: 3/8 in. liquid, 7/8 in. rated vapor
- Factory charge: 7.3 lb R-454B | Sound power: 76 dBA
Air handler: Grandaire WCHL425AC
The WCHL425AC is a multi-position fan coil that installs upflow, downflow or horizontal, so it works in a closet, attic, crawlspace or garage. Its multi-tap ECM blower (1/2 HP, about 1,225 CFM nominal) holds airflow better than a PSC motor as duct static rises, and a 90-second blower off-delay pulls extra cooling from the coil after each cycle. The cabinet is insulated to R-4.2 with a vapor barrier, leaks less than 2% at 1.0 in. W.C., and includes the refrigerant leak detection and dissipation system required for R-454B. Cabinet size: 49-5/8 x 21-1/8 x 22-1/16 in. (H x W x D), 166 lb.
Electric heat
Heat strips are not included. For backup and defrost heat, choose a heater kit from the "Add an Electric Heat Strip" option above. Approved kits for this air handler: 5 kW (EHC05BKB), 8 kW (EHC07BKB), 10 kW (EHC10BKB), 15 kW (EHC15BKB), 20 kW (EHC20BKB). Ratings are at 240V; output is about 75% of that on a 208V supply.
Sizing and installation
Size the system from a Manual J load calculation rather than the size of the old unit. Line sets over 15 ft need a charge adjustment (0.60 oz per foot on 3/8 in. liquid line), and the installer should evacuate, leak test and commission the system to the manufacturer's procedures, which also keeps the warranty in force.
Common questions
Is this a matched system?
Yes. AHRI certificate 214101897 covers the W5H5S42AKAAA with the WCHL425AC.
Does it come with a heat strip?
No. Heat strips are sold separately and can be added from the option above.
What is the warranty?
Both units carry a 5-year parts limited warranty, extended to 10 years with registration within 90 days of installation, and the outdoor unit adds a 1-year unit replacement limited warranty.
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