I. Precise Product Description This series represents LG's high-efficiency scroll compressor product line developed for commercial refrigeration systems, covering small to medium capacity ranges (approx. 12.5HP-34.8HP). The series employs a modular naming convention reflecting different platforms and displacement gradients, and is specifically optimized for medium- and low-temperature commercial refrigeration applications. Utilizing efficient scroll technology across the entire range and compatible with common refrigerants like R404A/R507, it meets the comprehensive demands of commercial refrigeration systems for energy efficiency, reliability, and low noise. II. Core Features
High-Efficiency Scroll Design
Asymmetric profile design and high-precision machining ensure optimal sealing between the scrolls, reducing internal leakage and improving volumetric efficiency.
A patented anti-rotation mechanism ensures smooth orbital motion, achieving mechanical efficiency significantly higher than traditional piston compressors.
Optimized Wide Operating Range
Motor insulation class reaches F or higher, with built-in temperature sensors for real-time coil monitoring.
Patented liquid injection technology enables stable operation at lower evaporation temperatures (down to -40°C).
Robust Structural Design
High-strength cast iron frame and wear-resistant bearing design ensure long-term reliability under high pressure ratio conditions.
Fully welded hermetic structure, tested to 200% of rated pressure, eliminates refrigerant leakage risks.
Intelligent Protection Configuration
Built-in multiple electrical protections including motor overheating protection, phase loss protection, and reverse phase protection.
Optional oil level monitoring and oil heaters ensure lubrication reliability under extreme conditions.
III. Core Advantages
Energy Efficiency Leadership
EER (Energy Efficiency Ratio) across the entire series is 8-12% higher than previous generations, with significant improvement in IPLV (Integrated Part Load Value).
Optimized flow path design maintains high efficiency across 25%-100% load range.
Quiet Operation
Inherent low vibration of the scroll mechanism, combined with a flexible base design, results in operational noise 5-8 dB(A) lower than comparable piston compressors.
Particularly suitable for noise-sensitive commercial areas and indoor equipment rooms.
Easy Maintenance
Modular interface design supports quick replacement of core components.
Global warranty network provides emergency replacement unit support within 48 hours.
IV. Primary Applications
Centralized Refrigeration Systems
Central cooling source for medium-sized commercial complexes (QJ/QP series).
Modular units for district energy stations (QK/QJ series).
Professional Refrigeration Equipment
Large cold chain logistics centers (-25°C freezing warehouses).
Distributed refrigeration systems for supermarkets (medium/low-temperature display cases).
Special Process Cooling
Cooling systems for chemical processes.
Environmental control for GMP clean rooms in the pharmaceutical industry.
V. Selection Guide
Model
Theoretical Displacement (cm³/rev)
Rated Power (HP)
Compatible Refrigerant
Typical Application Scenario
QK125P
125
12.5
R404A / R507
Distributed systems for medium-sized supermarkets
QK208P
208
20.8
R404A / R507
Regional cold chain distribution centers
QJ264P
264
26.4
R404A / R507
Centralized air conditioning cooling plants
QJ325P
325
32.5
R404A / R507
Industrial process cooling
QP325P
325
32.5
R448A / R449A
Low-temperature freezing warehouses (-30°C)
QP348P
348
34.8
R448A / R449A
Large-scale quick-freezing tunnels
Summary LG's compressor series achieves precise product line coverage through platform-based design. While inheriting the inherent advantages of scroll technology, it is deeply optimized for the special operating conditions of commercial refrigeration. Its outstanding part-load efficiency and a design life of up to 30,000 hours make it the preferred solution for upgrading commercial refrigeration systems.
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