Zingfa QL3-35 Hermetic Compressor – 1.5 HP, R404A, LBP, 3-Phase 400 V, 1,600 W

Zingfa QL3-35 is a 1.5 HP hermetic reciprocating compressor built for commercial refrigeration systems operating at sub-zero temperatures, such as frozen storage cold rooms, freezer cabinets and deep freezers. It runs on R404A; with a 34.45 cm³ displacement it delivers 1,600 W (5,459 BTU/h) at −23.3 °C evaporating / +54.5 °C condensing (LBP) of cooling capacity. It is supplied with 400 V 3-phase power and requires no capacitor or relay.

R404A LBP 3-Phase Reciprocating Compressor: For Sub-Zero Cold Rooms and Freezers

The QL3 series, manufactured by Zhejiang Ankang (Xingfa), is designed for low back pressure (LBP) applications and operates in the −40 … −10 °C evaporating range. It is protected by an internal motor thermal protector. Its compact body saves space in small 3-phase frozen storage cold rooms and condensing units.

Key Technical Specifications and Equipment

• Brand / Model: Zingfa QL3-35 · manufacturer Zhejiang Ankang (Xingfa)
• Refrigerant: R404A
• Application: LBP (low back pressure) · evaporating −40 … −10 °C · condensing +30 … +60 °C
• Displacement: 34.45 cm³ · speed 2,900 rpm
• Motor: 3-phase, 2-pole · locked rotor current (LRA) 16 A · rated running current 2.1 A · winding resistance 11.6 Ω (25 °C) · insulation class F
• Power supply: 400 V / 3~ / 50 Hz (440 V / 3~ / 60 Hz) · no capacitor or relay required
• Protection: internal motor thermal protector
• Oil: POE, ISO VG 32, 500 ml
• Connections: suction 1"-14 UNF · discharge Ø10 mm · service (process) tube Ø7 mm
• Dimensions: height 282 mm · base 235 × 179 mm
• Mounting: 4 × M6 studs (203.2 × 122.2 mm) · with 4 rubber grommets and sleeves
• Sound power: ≤ 62 dB(A) · protection class IP21
• Pressure limits: high side max. 3.2 MPa · low side max. 2.0 MPa · discharge temperature ≤ 125 °C

Rated Performance

−23.3 °C evaporating / +54.5 °C condensing (suction gas 32 °C, subcooling 22.2 K, ambient 32 °C): 1,600 W (5,459 BTU/h) cooling capacity, 1,220 W input power, COP 1.31. Capacity decreases as the evaporating temperature drops; choose according to your cabinet's target temperature.

• ⚡ 3-phase connection: The compressor must not run in reverse for long periods; check the phase sequence and the phase protection relay. The system must have pressure, temperature, overcurrent and phase failure protection.
• 🔧 Commissioning: Do not evacuate the system with the compressor; do not run the compressor without a refrigerant charge or under vacuum. Charge refrigerant from a remote charging point, not from the suction/discharge line near the compressor. After removing the connection plugs, complete brazing within 15 minutes.
• 🌡️ Crankcase heater: A 45 W crankcase heater is recommended to prevent refrigerant migration during standstill; energize it 12 hours before the first start or after a long shutdown. Maintain suction line superheat to prevent liquid floodback.
• ⏱️ Operating pattern: To maintain the oil level, at least 10 minutes of continuous running and at least 3 minutes between stop and start are recommended. The tilt must not exceed 15° during operation.