Zingfa QL3-112 Hermetic Compressor – 5 HP, R404A, LBP, Three-Phase 380 V, 4,350 W

Zingfa QL3-112, built for commercial refrigeration systems operating at sub-zero temperatures such as freezer cabinets, frozen storage cold rooms and deep freezers, is a 5 HP hermetic reciprocating compressor. It runs on R404A refrigerant and, with a displacement of 112.5 cm³, delivers 4,350 W (14,842 BTU/h) at −23.3 °C evaporating / +54.5 °C condensing (LBP) of cooling capacity. It is supplied with 380-400 V three-phase power; no capacitor or relay is required.

R404A 5 HP LBP Three-Phase Reciprocating Compressor: For Frozen Storage Cold Rooms

Manufactured by Zhejiang Ankang (Xingfa), the QL3 series is designed for low back pressure (LBP) applications; it operates in the −40 … −10 °C evaporating range and is protected by an internal motor overload protector and an internal pressure relief valve. It has threaded (rotalock) suction and discharge connections, an oil level sight glass and a crankcase heater connection.

Key Technical Specifications and Equipment

• Brand / Model: Zingfa QL3-112 · manufacturer Zhejiang Ankang (Xingfa)
• Refrigerant: R404A
• Application: LBP (low back pressure) · evaporating −40 … −10 °C · condensing +30 … +60 °C
• Displacement: 112.5 cm³ · speed ≥2,860 rpm
• Motor: 3-phase, 2-pole · locked rotor current (LRA) 68 A · rated running current 5.0 A · winding resistance 2.2 Ω (25 °C) · insulation class F
• Power Supply: 380-400 V / 3~ / 50 Hz (460 V / 3~ / 60 Hz) · no capacitor or relay required
• Protection: internal motor overload protector · internal pressure relief valve
• Oil: POE, ISO VG 32, 2,000 ml · oil level sight glass
• Connections: suction 1 3/4"-12 UNF · discharge 1 1/4"-12 UNF (rotalock) · service (process) tube Ø7 mm
• Dimensions: height 398 mm · base 320 × 225 mm
• Mounting: 4 holes (190.5 × 190.5 mm) · with 4 rubber grommets
• Weight: 48 kg (including oil) · sound level ≤ 66 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): 4,350 W (14,842 BTU/h) cooling capacity, 2,830 W input power, COP 1.54. Capacity decreases as the evaporating temperature drops; make your selection according to the target cabinet temperature.

• ⚡ Three-phase connection: The compressor must not be run in reverse for long periods; the phase sequence and phase protection relay must be checked. The system must have pressure, temperature, oil return, overcurrent and phase failure protections.
• 🔧 Commissioning: The system must not be evacuated with the compressor; the compressor must not be run without a refrigerant charge or under vacuum. Refrigerant should be charged from a remote charging point, not from the suction/discharge line close to the compressor. Installation must be completed within 15 minutes after the connection plugs are removed.
• 🌡️ Crankcase heater: A crankcase heater (45 W) is recommended to prevent refrigerant migration during standstill; it should be energized 12 hours before the first start or after a long standstill. Liquid flood-back should be prevented by maintaining suction line superheat.
• ⏱️ Operating pattern: To maintain the oil level, at least 10 minutes of continuous operation and a wait of at least 3 minutes between stop and start are recommended. The tilt must not exceed 15° during operation.