Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: My air conditioning unit is
90 percent of the time the freon charge is low and lack of freon lessens the amount of compressed heat that can be created and also the amount of heat that can be extracted. hence less cooling and less heating. however the exact same thing can occur when a change over valve gets stuck partially between heat and cool . it then mixes the hot and cold together and you get poor cooling and poor heating. you check it with a gage. fed law requires that you have an epa certification to apply a gage. low pressures in heat and cool on both high and low pressure gages are a sign of low charge. if low pressure and high pressure are close to the same on both gages then a good chance valve is stuck half way between. you can also sometimes check by feel . at the change over valve two lines should be virtually to hot to touch and two should be cold to the touch. one is heating flow and other is cooling flow. if the valve is stuck then temps will be within a few degrees of the same on all. low charge and the hot lines won't be hot hardly .and the cold line s barely cool. look for white frost forming in the heat mode outside at the condensor tubing shortly after you turn on the heat. thats a sign of low charge. good luck.
Posted on Nov 04, 2008
blowing cold air on this furnace usualy caused by high limit trip, or flame roll out. the first one, (high limit) is from insf. air flow. (blocked filter,bad zone damper?
The second,(flame roll out) caused by bad heat exchanger,blocked vent.ect.
Posted on Jan 11, 2009
SOURCE: Not heating
I'm a Certified HVAC Technician and have been working in the industry since 1996. I totally agree with Rob. But, I'm a bit confused in that I have read "Problem with Amana Comfort Zone 18M33PCEH Air Conditioner" but then I read "Not heating Unit works on cooling mode, will not work in heating mode..blows cold air.
Does reversing valve have a seperate coil or built in"
First of all, an AIR CONDITIONER does not have a "REVERSING VALVE" - only a HEAT PUMP has a REVERSING VALVE. If the THERMOSTAT was REPLACED, did the ORIGINAL COLORED WIRES and ORIGINAL TERMINALS get RECORDED onto a piece of paper? It is imperative that the CORRECT COLORED WIRE within the Thermostat is CONNECTED to the "O" which, on MOST HEAT PUMP Thermostats is the REVERSING VALVE and, in MOST cases is the ORANGE wire. In every HEAT PUMP system that my company has installed, I have directed all of my technicians to use the STANDARD wiring COLOR Codes, regardless of WHAT was previously used. That way, when another HVAC Technician is called, he or she can easily troubleshoot and reduce the amount of time spent on the Service Call, thus saving the homeowner $$$ in the long run. Good Luck!!!
Unit works on cooling mode, will not work in heating mode..blows cold air.
Posted on Sep 20, 2012
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