How to make certain a heating and cooling reversing valve is working correctly?
If this is a reversing valve on a heatpump all you need do is to find out if you are getting voltage to the solenoid on the reversing valve. The solenoid is energized in either the heating or cooling mode, depending on the unit and normally receives its voltage from the orange wire from the thermostat.
If you have no voltage to the solenoid in the cooling mode, switch it over to heat. If you still have no voltage, the solenoid or the control board is bad and needs to be replaced. If you have voltage, the valve should make a swooshing noise when the unit is switched from heat to cool/cool to heat. No swoosh, valve is bad.
*First, if there is no voltage to the solenoid, then the problem does not necessarily lie in the solenoid, but from the source of its power: a relay, a control board, etc...
*Second, the statement, "No swoosh, valve is bad" is common terminology used by people who don't completely understand how heat pumps and reversing valves operate. The "swoosh" is the refrigerant rushing sound heard when the slider inside the valve shifts positions. The slider is operated by discharge pressure from the unit's compressor. If the unit is low of refrigerant it might not have enough discharge pressure to make the slider shift, therefore no "swoosh" sound.
A lot of reversing valves and compressors have been needlessly replaced by individuals who don't know what they are doing.
What makes a heat pump change from cooling to heating Is it the reversing valve or is it something else I guess what i am asking is it that componet or does it have some kind of thermostat on it?
Typically, your central thermostat sends a 24 volt signal to a terminal labelled "O", down a (usually orange-colored) wire to the reversing valve. This energizes the valve to switch over to cooling operation. For heat, the 24 volt signal is removed, and the valve defaults to the heating position. The HVAC Veteran
Thermo cycling AKA thermic cycling AKA thermal cycling means taking something, heating it, cooling it and heating it and cooling it over and over again. Each hot-cold sequence will introduce mechanical stresses as materials expand on heating and contract on cooling. It's often used to research how durable a certain design is likely to be.
The best information on geothermal heating and cooling will come from your local heating and cooling professional, who will evaluate your situation and help determine what product is right for you. There are many websites that offer general information on geothermal heating and cooling as well, including Earth Comfort, Geo Comfort and Energy Star.
A heat pump is an air conditioner working in reverse. When the unit is in cooling mode, it moves heat from the interior to the exterior. When the unit is in heat mode, it moves heat from the exterior to the interior. In most cases, the thermostat controls the necessary components that perform the reversing process necessary to change from heating mode to cooling mode.
Cooling Load is the amount of energy that is to be extracted from a house to develop a conditioned environment. There are two types of cooling loads i.e, sensible cooling load and latent cooling load.... Heating Load is the amount of heat that is to be supplied to a house in order to increase its temperature to maintain desired temperature...