I. Technical Features
This product line is positioned as a dedicated unit for demanding heat pump and high-temperature operating conditions. Unlike the "universal variable frequency" nature of the DHV series, the core competitiveness of the G series lies in breaking through the compression ratio limit. Its design goal is not to handle part-load conditions, but to maintain highly efficient inverter response even under full-load or even overload conditions (such as low evaporation temperatures in winter and ultra-high condensation temperatures in summer).
Axial Flexibility Sealing: For conventional scroll compressors under high compression ratios, end-face leakage of the scroll plates increases dramatically. The G series introduces a floating scroll plate design, allowing the orbiting scroll to produce micron-level floating displacement in the axial direction. When the discharge pressure surges, high-pressure gas pushes the orbiting scroll upward tightly, achieving an adaptive effect of "the higher the pressure, the tighter the seal." The compression ratio can reach 14.3, far exceeding the conventional range of the first group (typically 8~10).
Anti-overcompression Technology (Release Valve): This is a unique differentiating structure of the G series. In heat pump heating mode, when the operating pressure ratio exceeds the design pressure ratio, this valve actively releases excess pressure in the center of the scroll, avoiding the additional power consumption caused by "overcompression." The unit can still stably achieve a heating water outlet temperature of over 65°C in an ambient temperature of -15°C, a high-temperature hot water capability that the first group (DHV) cannot reach.
Material Upgrade: The surface of the scroll plates undergoes a special nitriding and hardening treatment, and the motor windings adopt a fluorine-resistant and high-temperature-resistant composite insulation layer. This ensures that under high-pressure environmentally friendly refrigerants such as R407C, insulation breakdown will not occur even if the winding temperature soars above 130°C.
II. Scope of Application
Core Application Areas: High-temperature Heating, Industrial Heating, and Temperature Control in Demanding Conditions
This series primarily serves heating and industrial fields with stringent requirements for water outlet temperature, compression ratio, and low-temperature adaptability:
Heat Pump Heating and Hot Water Systems: Optimized specifically for commercial heating, centralized heating, domestic hot water, and other scenarios. It can achieve hot water outlet temperatures ranging from 25°C to 60°C or even higher, meeting the demands of northern heating and hotel hot water supply.
Industrial Drying and Dehumidification: Widely used in industrial and agricultural drying fields, such as wood drying, agricultural product processing, and dehumidification heat recovery for lithium battery production. The high compression ratio characteristics can meet the demand for high-temperature hot air (up to 96°C outlet air) during the drying process.
Large Building Cooling and Heating Systems: Suitable for cold and heat source supply in large buildings such as ultra-large factories, commercial complexes, and biopharmaceutical workshops.
Air-cooled/Water-cooled Heat Pump Units: As the core power component of air-cooled scroll chiller (heat pump) units - G series, it performs exceptionally well in scenarios requiring both cooling and heating.
Typical Terminal Equipment: Air source heat pump units, water source heat pumps, air-cooled heat pump chiller units, high-temperature drying equipment, industrial dehumidification systems.
Q1: The unit's discharge temperature is too high (exceeding 100°C). How to resolve this?
Symptoms: High discharge temperature, which may trigger a high-pressure alarm. When the discharge temperature exceeds 130°C, it can even cause carbonization of the lubricating oil.
Possible Causes:
Insufficient refrigerant — Lack of refrigerant leads to insufficient motor cooling, resulting in increased discharge temperature.
Poor heat dissipation of the condenser — The outdoor heat exchanger is dirty or blocked, or the fan system is malfunctioning.
Excessive moisture in the system — Causes ice blockage, manifesting as high discharge temperature, low suction temperature, high suction pressure, and frosting on the suction pipe filter.
Solutions:
First, check the system for leaks. After repairing, replenish the refrigerant.
Clean the outdoor heat exchanger, inspect the fan system, and remove any obstructions from the air inlets and outlets.
If it is an ice blockage fault, recover the refrigerant, replace the refrigeration oil, install a drier filter, evacuate the system and hold vacuum for 24 hours, and replace the drier filter multiple times until its color no longer changes.
The G series uses a fluorine-resistant and high-temperature-resistant composite insulation layer, and the windings can withstand high temperatures above 130°C. However, it is still necessary to promptly investigate and address the root cause.
Q2: The heat pump heating performance is poor, and the water outlet temperature cannot reach the design value. What should I do?
Symptoms: Low water outlet temperature during winter heating, failing to meet heating demands.
Possible Causes:
Insufficient or improper refrigerant charge in the system.
Anti-overcompression technology (Release Valve) not working properly — This valve should actively release excess pressure when the operating pressure ratio is higher than the design pressure ratio.
Failure of axial flexible sealing — The floating scroll plate cannot produce micron-level floating displacement, leading to a decrease in sealing effectiveness.
Solutions:
Check the system refrigerant charge to ensure it meets the design requirements.
Check whether the Release Valve is stuck or damaged.
If the scroll plate is severely worn, the compressor needs to be replaced (the G series scroll plates undergo a special nitriding hardening treatment and have a long service life).
Q3: What causes abnormal compressor operating sound or excessively high housing temperature?
Symptoms: Abnormal operating sound from the compressor, and excessively high compressor housing temperature.
Possible Causes:
Operation with insufficient oil — Causes built-in protection activation, such as discharge or top temperature protection, overcurrent protection, etc.
Deterioration of refrigeration oil — Excessive discharge temperature causes the oil to deteriorate, resulting in poor lubrication.
Confusion between liquid injection cooling and vapor injection (EVI) — The two have different functions, and confusing them will cause system abnormalities.
Solutions:
Check the quality and level of the refrigeration oil, and replace deteriorated oil promptly.
Confirm that the piping connections and control systems for liquid injection cooling and vapor injection are correct.
