Frost description compressor, compressor air intake return air temperature is too low, then what would cause the compressor back to gas temperature too low?

Known refrigerants if you change the volume and pressure of equal quality, the temperature will have different performance, namely liquid refrigerant if absorbing more heat then the refrigerant will be of the same quality of volume of all three high pressure and temperature, if less heat then volume will be low pressure and temperature.

So that the compressor back into a low gas temperature will also show return air pressure is low and the same volume of refrigerant is high, can result in root-knot for this refrigerant is flowing through the evaporator cannot fully absorb its expansion to a predetermined pressure temperature of heat required, leading back to the volume of the gas temperature and pressure values are relatively low, can cause this kind of problem has two:

1, throttle valve liquid refrigerant supply but supply refrigerant expansion evaporator not heat properly.

Heat 2, evaporator works fine but too much throttle the refrigerant supply, which istoo much refrigerant flow, we usually understand the fluoride, which means that fluoride may also result in low voltage.

Second, the compressor gas due to fluoride less frosting

1, and due to cold media of flow special less, will led to cold media since outflow throttle valve Hou end Hou first a can expansion space on began expansion, we most saw expansion valve Hou end points liquid head knot cream often is due to deficiency fluoride or expansion valve flow enough caused of, too little has cold media expansion not using to all of evaporator area, only will in evaporator local formed low temperature, part regional due to cold media volume less and sharply expansion caused local temperature low, appeared evaporator knot cream phenomenon.

After partial frosting, because of the insulation layer is formed on the surface of theevaporator and heat in the region is low, refrigerant expansion shifted to other regions gradually appear across the evaporator frosting or icing, the entire evaporator heat insulation layer is formed, then expansion will spread to the compressor suctiontube compressor back to frost.

2, due to the small amount of refrigerant, evaporator pressure low causes low evaporation temperature, condensation will gradually cause the evaporator heat insulation layer is formed and the expansion point transferred to the compressor air compressor air frost. The above two points are compressor air from the evaporator frostingbefore frosting.

Actually most situation Xia for received cream phenomenon, as long as regulation heat bypass valve on line, specific method is open heat bypass valve Hou Department end cover, then with 8th, within six angle wrench, Shun clockwise turned inside of regulation nut, regulation process don't too fast, General turned half circle around on suspended about, let system run a time Hou See knot cream situation again decided whether continues to adjustment. Stable operation, compressor Frost disappears,then tighten end cover.

For models with 15 cubic, in the absence of hot gas by-pass valve, if Frost is serious,you can increase the condenser fan pressure switch jump the pressure. Specific method is to first find the pressure switch, remove pressure switch adjusting nut fixed small pieces, and then use a Phillips screwdriver clockwise, the whole regulation alsoneeds to be gradually, transferred under a half circle to see the situation and then decide whether you need to adjust.

Third, frosted cylinder head (crankcase severe frost), always due to the wet steam orcaused by inhalation of refrigerant compressors. The main reasons for this situationare:

1, excessive thermostatic expansion valve adjustment, thermal package installation errors or fixing loose, so temperature is too high to make spool abnormally large.

Thermostatic expansion valve superheat at the outlet of the evaporator as the feedback to make it with a given degree of superheat value adjusted deviation signal after entering the evaporator, refrigerant flow direct acting type regulator, which wrote in one device, regulator and actuator.

When the letter is the measured parameters with the given value when there is a deviation, letters of physical changes and generate enough energy direct drive actuator motor, actuator position and is proportional to the parameter.

Thermal expansion valve in accordance with the balance in different ways, can be divided into inner-balance thermal expansion valves and balanced thermostatic expansion valve are two. The liquid refrigerant in the evaporator of the heat, while flows to the evaporator outlet, have been completely vaporized, and a certain degree of superheat. Thermal expansion valve temperature on the tube close to evaporator outlet pipe, and the evaporator outlet temperature. If the temperature inside the package of liquid-filled with the same coolant, the thermostatic expansion valve liquid above the diaphragm pressure greater than the liquid pressure under the diaphragm,and evaporator outlet temperature, the higher the greater the superheat and liquidpressure higher above the diaphragm.

This pressure difference through push rod and adjust the spring tension equilibriumbelow the diaphragm. If you change the adjust the spring tension can be changed on the ejector top, thus changing the needle valve opening. Clearly, the level of evaporator superheat can also lead to changes in needle valve opening. When adjustingspring is adjusted in a certain location, the expansion valve will automatically change according to the evaporator outlet temperature needle valve opening, the evaporator outlet temperature maintained at a certain value.

Thermostatic expansion valve adjustment excessive thermal package installation errors or fixing loose, so temperature is too high to make the valve core is not normally open to make frosting a lot wet steam inhalation compressor cylinder head. Whenevaporator thermostatic expansion valve superheat adjustment in use.

Evaporator superheat quite large evaporator superheat too long, cooling capacity may significantly reduce export of superheat is too small and could cause compressorliquid shock and even frosted cylinder head. Generally considered to transfer to theevaporator outlet of expansion valve superheat is 3 c ~6 c.

2, solenoid valves for fluid leaks or outage lax expansion valve closing, causes before starting has accumulated a large amount of liquid refrigerant in the evaporator. Thermal relay and solenoid valves used in combination to control Cuvin.

Temperature following electrical of sense temperature package placed cold storage in the, dang cold storage temperature above up adjustable set value ceiling Shi, temperature following electrical touch points connected, electromagnetic valve coil power, valve open, refrigeration agent into evaporator for cooling; Dang Cuvin below its adjustable set value of lower Shi, temperature following electrical touch points disconnect, cut electromagnetic valve coil current, electromagnetic valve close, refrigeration agent stop into evaporator, such on can put library temperature control in by needed of range within.

3, start the compressor suction valve open too large or up too early.

4, filled with too much refrigerant in the system. System in the refrigeration agent too much Shi, condensation device in the of liquid bit high, condensation for hot area reduced, makes condensation pressure increased, that expansion valve Qian of pressure increases, into evaporator of refrigeration dose on increased, liquid refrigeration agent in evaporator in the cannot completely evaporation, so compressor inhalation wet steam, cylinder hair cold even knot cream, and may caused "liquid hit", while evaporation pressure also will partial high.