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depends on who makes it. some energize in heating and some in cooling.

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Q: When the solenoid on a heat pump is energized in what mode will the reversing vavle be?
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Central air conditioner a heat pump wheezes when turns off?

Heat pumps have a reversing valve in the outside unit. You are hearing a balance of refrigerant pressures when the reversing is energized or de-energized.

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.

Do particles get energized by heat?

yes particle get energized by heat.

Can you replace your straight cool AC condensing unit to a same size unit with heat pump?

Hi, Good question and the answer is ( YES! ) as long <<<< as you are not taking up any fancy ideas of using it as a heat pump. Wire it in and set the reversing valve to stay on cool cycle and never reverse to heat and viola. Some units use energized reversing valve during cool and some de-energized. Its easy to find out. Just try it. Hope this helps: Jimiwane

Why is the small copper pipe cold and larger copper pipe hot at the outside unit?

My guess is you probably have a Heat Pump Condenser. If you are running in air conditioning you need to make sure that the reversing valve is energized.

Why is your central air condition blowing warm air?

there are 3 main reasons that your a/c is blowing warm during a call for cooling they are 1.the electric resistance heater is on 2. the reversing valve is energized in a Heat Pump, or you are low on refrigerant

What component allows heat pump to switch between heating and cooling modes of operation?

the reversing valve is what actually changes the refrigeration cycle from heat to cool. the reversing valve receives its signal from the thermostat.

Car starter does not work when engine is warm?

Solenoid is getting hot from heat transfer. Wire in a remote solenoid.

How does a split system heat pump work?

The reversing valve switches the flow of refrigerant from cool to heat inside and outside the home.

Where must a suction line be placed in a heat after a motor burnout?

between the comp and the reversing valve

Central unit blowing cool air instead of hot when heat is on?

sounds like t stat is programmed wrong, reversing valve coil is bad or reversing valve is stuck.

How many wires are on a heat pump thermostat?

Usually a minimum of 5: R (24 volt "hot")G (fan signal)W (heating signal)Y (cooling signal)O (reversing valve: usually energized for cooling)Many also require a 6th:W2 (2nd stage of heat--backup heat)Some thermostats also requireC (24v "common")More sophisticated systems may also requireY2 (2nd stage cooling)The HVAC Veteran