KFFEH3101C15A – HEAT KIT (15 KW, 81-24738-00, R454)

Carrier/Bryant KFFEH accessory electric heater package, 15 kW at 240V, 230V single phase, with an internal circuit breaker. Carrier’s KFFEH instructions cover installation in FJ4 and PF4MNX fan coils – the current fan coil platform – for fan coil sizes 24-60. The older KFCEH kits are the equivalents for the previous fan coil generation.

Specifications published by the manufacturer. Source: manufacturer documentation.

Specs

• BrandTUTCO
• Heating Capacity15 kW @ 240 V
• Heating Capacity @ 230 V47,100 BTU/h
• Voltage / Phase230 V / 1 Ph
• Stages (kW operating)5 kW and 15 kW
• Internal ProtectionCircuit breaker
• Fits Fan CoilsCarrier/Bryant FJ4, PF4MNX
• Fan Coil Sizes24-60
• Heater Amps (208 / 240 V)53.4 / 59.1 A single point; 35.6 / 39.4 A and 17.8 / 19.7 A dual
• Minimum Ampacity74.4 / 81.5 A single point; 52.1 / 56.9 A and 22.3 / 24.6 A dual
• Max Fuse or Breaker80 / 90 A single point; 60 / 60 A and 25 / 25 A dual
• Sold AsTUTCO-built kit, OEM equivalent

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• KFFEH3101C15
• FJ4DNXC
• ECH15BKB
• ECH15BKB1
• 81-24738-00

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• Carrier / Bryant FJ4 series fan coils
• Carrier / Bryant PF4MNX series fan coils
• R-454B generation equipment - the earlier KFCEH kits cover the previous FA/FB/FC/FE/FH/FK/FV/FX/FZ/PF fan coils
• Approval is model-specific - check the heater table in the fan coil literature and the unit nameplate before ordering

How do I size a heat kit for my air handler?

Match the kW rating to your air handler's tonnage: - 10 kW -- fits 1.5, 2, or 2.5 ton air handlers - 15 kW -- fits 3, 3.5, or 4 ton air handlers - 20 kW -- fits 5 ton air handlers

Can I add electric heat to my heat pump system?

Yes -- heat pumps almost always use electric strips as backup ("auxiliary heat" or "emergency heat"). The thermostat energizes the strips when outdoor temps drop below balance point (typically 35-40 degrees F in DFW). Match the heat kit to your air handler model.

What does the suffix on the part number mean?

The suffix typically indicates breaker configuration: - BRK = factory breaker included - BR = breakerless (you provide the disconnect) - Other suffixes = circuit count, voltage taps, or thermostat compatibility

How long does an electric heat kit last?

20+ years typical for the kit itself; individual heating elements (sheath heaters) may fail in 8-15 years from cycling. Most kits have replaceable elements -- you don't have to replace the whole kit for one bad strip.

Why is my heat kit tripping the high-limit?

Restricted airflow is the #1 cause: clogged filter, dirty blower wheel, undersized return, closed-off supplies. The strips overheat when air doesn't move across them fast enough. Diagnose airflow before condemning the heat kit or limit switch.