RCFY4821STANMC – EVAPORATOR COIL (3.5 – 4 TON, R454B, 21″, SEER2)

Rheem Endeavor Line RCFY cased indoor coil rated by Rheem at 48,000 BTU/H nominal on R-454B with a factory-installed TXV. It is an N-Coil in a 21″ wide cased cabinet, 28″ tall and 21 11/16″ deep, weighing 71 lb, with 3/8″ liquid and 7/8″ vapor copper sweat connections. The multipoise cabinet is rated for vertical upflow or downflow and horizontal left or right airflow.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• SeriesEndeavor Line RCFY
• Nominal Capacity48,000 BTU/H
• Nominal Tonnage3.5-4 ton
• RefrigerantR-454B
• Metering DeviceTXV
• Coil SeriesN-Coil
• OrientationMultipoise (upflow, downflow, horizontal left/right)
• Cabinet Width21 in
• Height28 in
• Depth21 11/16 in
• Liquid Connection3/8 in sweat
• Vapor Connection7/8 in sweat
• Coil Weight71 lb

How do I match a coil to my condenser?

Tonnage and refrigerant first, then the cabinet. An R-454B condenser needs an R-454B rated coil like the RCFY, with the metering device and circuiting sized for it. Cased width then has to fit what it sits on - 17-1/2, 21 or 24-1/2 inches on most furnaces and air handlers. Going one nominal size up is legitimate for airflow, but only if that pairing is an AHRI listed combination.

Does the coil come with the TXV?

The RCFY ships with the expansion valve factory installed and bi-directional, so nothing internal changes going horizontal left to right. Plenty of aftermarket coils ship bare or with a fixed piston, so ask first. A condenser expecting a TXV and finding an orifice will not hold superheat near spec.

Does one coil work upflow, downflow and horizontal?

Multi-position coils like the RCFY handle all four, but the drain side changes. There are two sets of 3/4 inch NPT connections, primary and secondary, and horizontal in an attic you connect both and set an overflow pan under it. In a 140F Dallas attic a plugged primary with nothing behind it puts water through the ceiling, and that repair costs more than the coil.

My coil leaked at nine years. Did somebody abuse it?

Almost never. What we see in DFW is formicary corrosion - microscopic ant-nest tunnels eating from outside the copper inward, driven by formic and acetic acid off latex paint, plywood and engineered flooring, cabinetry, sheet vinyl, cleaners and aerosols, plus condensate and oxygen. Research puts it on the home environment, not the coil builder, and the leaks land in the fin pack where nobody can reach them. One reason newer coils use aluminum tube, not copper.