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Är det verkligen vettigt att byta en kompressor på en 15 år gammal värmepump.
Är det verkligen vettigt att byta varmvattenberedare på en 15 år gammal värmepump Nästa gång är det elektroniken som måste bytas, nu när renoveringskarusellen är igång måste man fortsätta renovera, hur mycket ska man renovera innan man drar i handbromsen Det är precis av den här anledningen separata enheter är bäst om man har plats!
Men separata enheter, det finns väl inte värmepumpar som bara är renodlade värmepumpar? De brukar ju komma med inbyggd varmvattenberedare och anslutningar för radiatorvärme.
Min VP ville inte starta i höst. Motorskyddet löste ut och installatör tillkallades. Lågtryckssidan löste ut eftersom det var läckage på röret till kompressorn.
Vad kostar kompressor bytet
XHV and ZHW Variable Speed scroll compressors for R410A, for outstanding performance for cooling and heating applications.The new Emerson Climate Technologies solution for variable speed applications with capacity modulated compressors. XHV and ZHW compressors deliver outstanding performances, both in new building and retrofit applications. Variable Speed Copeland Scroll compressors feature a state-of-the-art brushless permanent magnet motor matched with a highly efficient drive and vapor injection technology (ZHW only). In addition to Copeland market-proven robustness, XHV and ZHW compressors with the qualified inverter drive meet and exceed the level of reliability expected for these demanding applications.Features and Benefits• Highest efficiency throughout the operating envelope and speed range• Envelope and speed management information for the system controller (real-time communication via Modbus RS485)• Enhanced Vapor Injection technology for best seasonal efficiency (ZHW)• High water temperature for all applications• Compliance with electromagnetic-compatibility (EMC) and electromagnetic-interference (EMI) requirements for residential applications• VDE certification for ZHW compressor matched with Emerson Climate inverter drive• Wide speed range 15-120Hz• Mutually optimized and qualified scroll and drive
Copeland Scroll™ XPV and ZPV Variable Speed compressors are designed to deliver maximum cooling and heating efficiency when you need it most. Equipped with the latest variable speed technology, they allow system manufacturers and building owners to achieve superior performance when designing reversible chillers, heat pumps, precision cooling systems or rooftops.In addition to Copeland market-proven robustness, the new XPV and ZPV ranges with their qualified inverter drive meet and exceed the level of reliability expected for these applications.Features and Benefits Operating Envelope R410A• Highest part load efficiency in its class enabling significant energy savings and standards compliance• Wide speed range for enhanced part load efficiency and dehumidification: 1,000-7,200 RPM (17-120Hz)• Capability to be tandemized with fixed speed compressors for maximum flexibility in system design• Both compressor and drive are Copeland™ approved for reduced design time, cost and speed to market• BPM motor technology for highest efficiency• Sound reduction technology for reversible chiller transition and defrost
If a contactor is used to disconnect the VFD from the motor it should be interlocked to only switch when the VFD is off. The VFD should not be allowed to operate with the output from the drive to the motor as an open circuit. There should be a contactor on each side of the drive, ie, between the drive and the supply and between the drive and the compressor motor. They should be interlocked to break the supply side first.When switching on, the motor side contactor should be made first. When using a VFD bypass, care should be taken to ensure there can be no voltage feedback to the VFD. Therefore when the bypass contactor is closed and the bypass is in operation, the contactors on either side of the VFD must be open.
Jag sitter och läser om tråden för jag ser att vissa inlägg har uppdaterats.
Due to Copeland Scrolls inherent ability to handle liquid refrigerant in flooded start and defrost cycle operation, an accumulator is not required for durability in most systems. However, large volumes of liquid refrigerant repeatedly flooding back to the compressor during normal off cycles, or excessive liquid refrigerant flooding back during defrost or varying loads can dilute the oil, no matter what the system charge is. As a result, bearings and moving parts will be inadequately lubricated and wear may occur.If an accumulator must be used, the oil-return orifice should be from 1 to 1.4 mm in diameter for models ZH12K4E to ZH45K4E and ZH09KVE to ZH18KVE, and 2.0 mm for models ZH56K4E to ZH11M4E and ZH24KVE to ZH48KVE, depending on compressor size and compressor floodback results. To protect this small orifice from plugging with system debris a large-area protective screen no finer than 30 x 30 mesh (0.6 mm openings) is required. Tests have shown that a small screen with a fine mesh can easily become plugged causing oil starvation to the compressor bearings.The size of the accumulator depends upon the operating range of the system and the amount of subcooling and subsequent head pressure allowed by the refrigerant control. System modelling indicates that heat pumps that operate down to and below -18°C will require an accumulator that can hold around 70% to 75% of the system charge.
The EXV valve is to be installed vertically with stepper motor locked into position. See Figure 22 for correct orientation. To ensure the valve has the proper mounting, calibration and control, only the Emerson supplied stepper valve (p/n 998-0340-**) should be used with CoreSense Diagnostics for Copeland Scroll K5 refrigeration compressors.NOTE: When using an EXV stepper valve a liquid line shutoff solenoid will need to be installed on the liquid line. This is in the event of a power loss that will leave the EXV motor in it's current position and potentially allow liquid to enter the compressor while off. A vapor line shut off may be needed in the event of a motor protection trip where the control circuit is not opened. It is recommended to use a current sensing relay to ensure that liquid line solenoid is to be closed when compressor is off.
De nämnde ett annat intressant fenomen som kan leda till allvarliga olyckor; Dieseleffekten. Det innebär att om det skulle komma in luft i köldmediesystemet så finns det en risk att smörjoljan i kompressorn kan antändas som bränslet i en dieselmotor. Detta eftersom det är så extremt höga tryck. I en dieselmotor är det runt 20 bar vid antändningstillfället. I ett kylsystem så ligger ju trycket mellan 20 och 40 bar beroende på köldmedium. Därför föreligger det en explosionsrisk vid drift om det kommer luft in i kompressorn.
Det verkar märkligt. Det är inte trycket i sig som är problemet utan det är kompressionsförhållandet som bestämmer temperaturstegringen. Även om det är 20 till 40 bar på köldmediet efter kompressorn så är trycket i förångaren betydligt högre än atmosfärstrycket. Det går inte att jämföra med en dieselmotor som suger luft som har ett tryck på 1 bar.
Angående PLC/controller så får du et problem med en VP dersom du får "PLC freeze", som av og til forekommer. I industrien anvendes Siemens S7 i kritiske applikasjoner, og det blir vel en smule "overkill" og ha en Siemens S7 i en VP?
Temperaturökningen bestäms av kvoten mellan sluttrycket och starttrycket. Formeln är T2/T1 = (P2/P1)((k-1)/k) där k = 1,4 för luft och runt 1,3 för köldmedier vars molekyler har fler atomer än luftmolekylerna. Det betyder att ett visst tryckförhållande ger lägre temperaturstegring för ett köldmedium än för luft. ...
This diagram shows the economizer circuit parameters:LI is the liquid temperature at the inlet to the heat exchanger and it may be lower than the condensing temperature due to subcooling in the condenser. The maximum condenser subcooling value is limited to 5.5K and if a lower liquid temperature is entered, then the performance of the EVI models is shown for 5.5K VO is the vapour temperature at the outlet of the heat exchanger. This is automatically set for 5K superheat.LO is the liquid temperature at the outlet of the heat exchanger. This is automatically set to 5K above the heat exchanger inlet temperature.LX is the liquid temperature at the inlet to the expansion valve of the evaporator. It is only shown for refrigeration vapour injected compressors, and it can be adjusted by entering a value for EVI Liquid Line Temperature Rise to allow for heat gain in the liquid line between the heat exchanger and the evaporator inlet.EVI Liquid Line Temp Rise: Temperature increase of liquid between the subcooler outlet and the expansion valve inlet. This temperature rise will normally be due to heat pick up in the liquid line from the surroundings. It is only applicable to Vapour Injected scrolls and 2-stage compressors with subcoolers. When this parameter is set the liquid temperature shown in the Performance record will be adjusted upwards by the amount entered, and the Evaporator Capacity will be reduced accordingly
A solenoid valve should be added if the expansion device does not close completely. This will avoid liquid migration to the compressor during the off cycle. In single compressor configuration, the solenoid valve may be in the liquid line or the vapour line. A liquid line position is usually preferred because the valve is smaller. However, if the compressor rotates in reverse direction during the first seconds of the off cycle, the valve should be installed in the vapour line in order to limit the volume of refrigerant between the valve and the compressor. With multiple compressors used in parallel with one economizer it is required to install a solenoid valve in the single injection line of each compressor. This would avoid injection in idle compressor.
Nu motsvar ju 40 000 mil inte ens ett års drift på en VP så när driftstiden för bilen är över så är en VP knappt inkörd, och felande tempgivare är ett rätt vanligt problem oavsett typ av pump och pumpfabrikat