Cooling Capacity (W) Reference:
FH4522F / TFH4522F: -10°C → 2202 W, +7.2°C → 5206 W
FH4524F / TFH4524F: -10°C → 2456 W, +7.2°C → 5706 W
FH4531F / TFH4531F: -10°C → 3504 W, +7.2°C → 7528 W
TFH4538F: -10°C → 7041 W, +7.2°C → 13400 W
TFH4540F: -10°C → 4301 W, +7.2°C → 9863 W
Features & Advantages:
This group offers the widest model range and broadest power coverage within the FH series (1⅘ HP to 3-2/7 HP), spanning a complete displacement range from 39.95 cc to 74.25 cc. All models in this group are positioned for High Back Pressure (HBP) applications, with an evaporating temperature range of -15°C to +15°C, making them suitable for medium-to-high temperature refrigeration scenarios.
Energy efficiency is a standout — the FH4522F achieves a COP of 2.58 W/W, and the FH4531F delivers 2.57 W/W, giving these units a clear energy-saving advantage over comparable products in their class.
This group also includes TFH4538F and TFH4540F, optimized for three-phase power, with displacements of 67.50 cc and 74.25 cc respectively. These two models are engineered specifically for industrial-grade, heavy-load applications.
Q1: FH4522F (R22) in a beverage cooler makes a "clacking" noise on startup after defrost
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Cause: Liquid accumulation in the evaporator after hot-gas defrost → combined with oil foaming on startup, resulting in a liquid-sloshing start and liquid slugging.
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Answer: After defrost, run the evaporator fan for a 3–5 minute delay before restarting the compressor; alternatively, install a crankcase heater and a suction accumulator.
Q2: Three-phase commercial units 4538F/4540F — suction line frosted all the way to the compressor shell
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Cause: TXV superheat set to 0°C with excessive liquid feed → flood-back washes away oil, causing bearings to run dry.
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Answer: For R22 commercial refrigeration, adjust superheat to 5–8°C; check the TXV sensing bulb installation; if frost reaches past the compressor suction inlet, shut down immediately and purge the liquid.
Q3: Installing a 45F on an air conditioner in place of a 55F causes high current under high-temperature conditions
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Cause: The 45-series MHBP design features clearance and valve geometry tuned for medium-to-high back pressure — forcing it to run at +15°C evaporation results in poor efficiency and an overheated motor.
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Answer: Select the 55-series for high-temperature air conditioning and the 45-series for medium-to-high back pressure commercial refrigeration — do not mix applications (this is a selection error, not a compressor defect).
