gurling sound at refrigerent lines Today's inspection had one of the systems where the refrigerant lines near the air handler in the attic was gurgling like air bubbles in the line. Anyone have an idea what is causing the noise? Need a home inspection in Wisconsin? listing of Wisconsin certified home inspectors. Re: gurling sound at refrigerent lines Originally Posted by bking Yeah, the noise was coming from an area about 18 inches away from the air handler. I turned it off and let set for about 15 minutes, started it up and the noise came back. Chuck Evans (TREC #7657) Level III Infraspection Institute Certified Infrared Thermographer (#8402) HomeCert Houston Home Inspections & Thermal Inspections Find us on Facebook Houston Thermal Inspections & Infrared Imaging Find us on Facebook Originally Posted by cevans I agree and the system I have to say working quite nicely, although there were several other issues that needed attention, i.e. loose ducts condensation dripping off the condensation lines and vegetation around the condensers, so I had no problem mentioning the gurgling sound in the report.

As for hot weather we are spot on at 89 degree, typical for this time of year. Mark your Summer Outdoor Design Temp is 87F Dry Bulb, 73F Wet Bulb. So, your are exceeding your design load. It should be making noise!The requested URL /?assetid=114 was not found on this server. Not all humming and noise is causd by ground loops. There are lots of other interference sources which can cause humming and other kinds of noise.pop up camper air conditioning units An earth loop will typically inject a 50Hz ot 60Hz hum into the signalcharging ac unit ford f150There can be also exist other harmonic frequencies in groundpanasonic split system air conditioners review india loop soiation, but practically always there is that 50 Hz or 60 Hz

if you have a 100Hz or 120Hz hum (which often has a hard "edge" to the sound) without that lower frequency 50Hz or 60Hz aroud, you should definately check also other sources of interference. this kind of only higher frequency interference is something wrong in the wiring of the power supply or some noise source in the electrical power system which causes that harmonic noise (light dimmer for example). The fastest way to tell if the amplifier is the cause of the noise, is to disconnect the input cables from the amplifier. If the noise is still there, itif it's gone, it's a source device inducing noise into the amplifier. If after removing the input connectors from the amplifier you find the noise still present, it will then be necessary to determine if the noise is coming from the AC line. isolation may be helpful. Try relocating the amplifier using a different AC service, if the same level of noise is present, the amplifier is likely to be the cause.

If the noise is lower, the AC service may be the cause. Mains transformers typically cause an AC magnetic field around them. This magnetic field can be copled to wiring, electronics or signal transformers and cause humming. Typically audio electronics are designed so that the magnetic felds caused by the mains transformer are not coupled to the sensitive elctronics in the equipment, but the magnetic fields from other equipments can be coupled to the If you have many equipments which have transformers inside them stacked together then you have a risk that the magnetic field form other equipment's transformers can cause hummign toThe normal aluminium case does not provide much protection against low frequency magnetic fields and only steel case can shield agains magnetic fields. Some power transformers in powerful equipments (like amplifier) are leaking a pretty heavy magnetic field. This has something to do with it being

cheaply constructed without good core material and something to do with Leaving a couple blank spaces between the equipment with that leaky power transformer and anything else might help. You can also try moving things around so the units that are least suceptable to hum pickup are closest to humming source. Many equipments nowadays use small wallwarts which you plut goThose transformers are usually chapely built (like those cheapest universal adaptors) and can cause lots of magneticIt is not advisable to put any sensitive signal wires or equipments near those wall transformers because they can cause seriousLook around and leave adequate space between the gear with transformers inside of them. Hign current carrying mains wiring can cause quite strong magnetic fields around the cable. If you run an audio cable near high current mains wiring it can easily pick up humming. It is a good idea to keep at least 0.5 meter distance between high current mains wiring and your

If the audio cable must cross a mains cable then make this crossing at exactly 90 degree angle so the mains cable magnetic field will not be coupled to audio cable. The interference coupled from mains wiring can become especially noticable if there are some problematic loads like fluorescent lighting, light dimmers or lots of computers connected to the mains wiring. Main poer distribution panels have high current carrying wires, relays and contactors in them and they can cause quite storng magnetif fields around then. It is not advisable to put any computer monitors or audio equipments near them. clearance from mains distribution panel is usually enough to stop any magnetic interference. Electrical motors use strong magnetic fiels inside them, so typically those motors also cause a noticable magnetic field arount the motor. equipments are near some powerful electric motors you might have quite strong magnetic fields near your equipments.

Remeber also that fans used in air conditioning and in many equipments can generate problematic magnetic fields so it is a good idea to keep yout equipment away from those. Radio interference can cause serious noise problems to the audio system which is not properly shielded. The most typical noises are all kinds of interference noises and the transimmission is heard in the audio system. Some strong radio transmitters and industrial systems which use radio frequency signals can sometimes be modulated with mains frequency humming (for example because of poor power supply). of modulated radio frequency signal enters to your equipments it can cause mains hummign like interference which is very hard to If mains voltage is not nice sine wave then it contains harmonics which can usually more easily enter to the circuit than 50 Hz mains. Typical sources for this kind of power quality problems are high frequency interference caused by dimmers.

Computer power supplies and fluorescent lighting can cause harmonics to the power and thus interference to sensitive equipments. Some cheapest UPS equipments put out vety low quality main voltage and if you connect sensitive audio equipments to such UPS you can get all kinds of noise problems. Mains quality problems are usually solved by using mains filters and isolationMany professional studios used high quality on-line UPS equipments to power the whole studio. This UPS will filter out any problems from the incoming power and also useful protection against short mains power breaks. Sometimes the phumming in the audio system is nor the main problem, but heHere are few noise sources and how to avoid that noise. First and foremost there's what is called "thermal noise". It is generated by all active and passive electronicd components (ncluding cold solder joints) and is simply a result os all those un-cooperative electrons smashign each other.

The only way to avoid the hermal noise in components is to make them very cold, but this is not an option in audio electronics. The gain structure of your system becomes on important to get madimum signal/noise Radio frequency interference (RFI) is a big source of all kinds of noises. Many RFI interferences are easily un-detected if you can't hear the actual "radio signal". Radio interference can easily take the form of hash that sound like white noise. shielding practices are your only real defence against RFI. Digital noise usually takes a form of high-pitched whine (usually round 15 kHz or so), but at lowe levels can be mistaken for hiss. Digital keyboards, lighting, computers, effect processors and just about everything which uses fast clock pulses can causeThis includes the switched power supplies in many modern audio equipmentsSome poortly designed equipments can radiate excessive levels of digital noise, often via mains AC cord.