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I need the some topic in thermal or fluid mechanics to reachers in it for doctora program

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Try fluid dynamics in domestic electrical generation.

Posted on May 28, 2008

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2014 Heartland Fairfield 405fl (extendend stay) Suburban SF42-Q furnace Does anybody know of any Mobile RV Mechanics in San Jose Ca (Bay Area-South)? Our furnace blower fan went whacky and broke the cage....


Go to Bryantrv.com and click on the Service Manuals link. It sounds like he missed a wire hooking it back up. There are usually 3 wires, red for hot, connected to the furnace and also a small blue wire with a red stripe, another small blue wire connected to varying colors but comes from the thermostat and a ground, usually yellow. There is a relay on the fan side of the furnace and a thermal safety on the back side, under the burner. The fan gets it's power from this relay and the furnace will not run until the fan is turning. It's common for the relay to go bad but I've only had to replace on thermal fuse in the last 12 years.

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1 Answer

I have samix AC, it does not heat properly.sometimes it doesnot heat at all. sometimes it heat to a certain limit and then start cooling. sometimes it heat to the required tempreture (24) for example


AC temperatures are controlled by thermostats, mechanical or electronic, As per your question it does work some times means thermostat is working some times. Please spray contact spray in thermostat, or replace thermostat. BTU (BRITISH THERMAL UNIT) denotes cooling capacity of AC.

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1 Answer

Pro Standard Fan mount


Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.

Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.

Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade. MORE DETAILS

Nov 13, 2012 | Air Conditioners

1 Answer

Hello, I have a Sharp CV-10MH that will run fine for about 2 minutes and then shut off and flash all of the front panel lights. I have done all maintenance possible -- clean filters, drained the lines,...


The problem you describe is a mechanical one. The compressor is overheated and stop to prodect from burn out. You need to check the freon charge, and the condenser fan if they are ok,
Also the thermal relay have to be check if it clik stable.

Jul 29, 2011 | Air Conditioners

2 Answers

On our AE125, the thermal cut-off is tripping AFTER the water is turned off. The heating element is getting so hot you cannot touch it


The elements are getting over heated then set temperature.You have a defective thermostat. The elements will continue to heat until they reach the set point of the thermostat. Try to lower the temp setting first. If that does not fix it, you'll need to repalce the thermostat, located very near the element, under the screwed cover on the side of the tank.------------- To know how this heater works, read as follows:---

Because electric tankless water heaters have to instantaneously raise the temperature of incoming water to a selected hot water temperature, they require very powerful heating elements. To power the heating elements of this 27,000 Watt model, you will need to upgrade the electrical service you were using for your storage tank water heater. The PowerStar AE125 will require a 240V, 200 Amp service. In addition you will need to install three 40 amp dedicated double pole breakers in your electrical box. In Canada, you will require one 120 Amp breaker.

The PowerStar AE125 electric tankless water heater incorporates a very sensitive flow sensor, and three heating elements. The heat from the electric elements is electronically modulated on the basis of the flow rate of the water entering the water heater, and the temperature rise that the water heater must achieve. Through its electronic modulation system, the AE125 maintains a very precise hot water temperature. As a safety precaution, each of the three heating modules is protected by an electro-mechanical thermal cut-out. This device will cut power to a particular module if the temperature gets too hot.

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This will help.Thanks.Helpmech.

Jul 02, 2011 | Air Conditioners

1 Answer

Turned heat on but only blows cold air


Any product that produce heat have a thermal breaker, a thermal fuse, or both. Thermal breaker usually look like short cylindrical shaped device, while a thermal fuse look like a fuse in which one end is pointed, and it is rated by how many degrees it will go bad. It would say it on the fuse. Thermal breakers will open the circuit when it reaches certain temperature, then closes again as the device cool down. This process keeps repeating to limit the temperature of a heating device.

Nov 27, 2009 | Intertherm P3RA-048K Air Conditioner

2 Answers

Air conditoner model gwhd5000 goldstar does not cool


Hi, first you will need to know, what type refrigerant,(freon) your a/c used, if you need to add freon, there's a leak in your a/c. you will have to find and repair leak, before you can charge/ add refrigerant(freon) . automobile a/c can be easily recharge (add) to system, but your window a/c unit, has the same principles but different approach, if you don't have experience, you will have to call mechanic, make sure you have a freon leak, before calling mechanic, plug a/c on let it work, put hands close to a/c, feel or check temperature of air blowing out from a/c, make sure compressor is working/running, fans could be working/ but compressor not, also put a/c thermostat to max, your model no. GWHD5000. means your unit is 5000 b.t.u, (british thermal unit) measurement of heat transfer, am wondering if a/c is to small for your space/room. making you think it needs freon, 5000. b.t.u. is for a small space,like a room 10' by 10' like a storage area or small bedroom, keep bedroom door/windows shut. measure you room/space/area , the bigger space/area needed to be cooled, has a chart, maybe you can find it on internet, any way a 10.000 or 12.000 b.t.u a/c is better buy, for normal room/space etc. so check compressor especially to make sure working, a/c could be to small for space/room, check it at night to see if it's colder. don't try to put gas/ freon yourself, could be very dangerous. but before calling mechanic, check those thing, mention before, could be your a/c are to small, for space/room etc. remember before attempting any repairs, disconnect power. good luck.

Aug 20, 2009 | LG Goldstar GWHD5000 wall/window Air...

1 Answer

1990 Dolphin Motorhome Dometic AC problem


If your fan motor is slowing or stopping mid cycle it will cause the compressor to over pressurize. Many compressors have aan internal mechanism that will kick in with a loud whooshing noise, then the Thermal protector shuts the compressor off, cools then restarts. If this sounds familiar, you will need to replace your fan motor before you burn up your compressor...which to be honest may already be irreparbly damaged(sorry). Hoping 4 the best.

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1 Answer

Goodman 3 1/2 ton unit


I work for a very large reputable goodman dealer. Your equipment appears to be a correct match. The correct orfice should have been taped to the outside of the outdoor unit in a baggie right beside where the pipes connect. Things will run alot smoother though if you scrap the orfice and have a TXV installed (thermal expansion valve) . This is a mechanical device that adjusts the flow of freon into the indoor coil based on the immediate needs of the coil. After that, balancing the refrigerant is a piece of cake as all we need is about 10 degrees of subcooling to make sure we have plenty of liquid to the TXV.

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