Hello, We have two heat pumps for dual heating and cooling. The upstairs one seems to have a problem. First of all, we have digital thermostats installed and when the heat comes on upstairs to heat to the temp setting, it runs for a while and does not reach the set temp, the emergency (auxiliary) heat kicks on to bring it to the correct temp. What could be wrong with the heat pump. Our downstairs unit is fine which has larger ceilings and a bigger space. Help??
Sounds to be a system freon leak. The unit and the stat talk to each other and if the temp is not reached and the unit shut down in a set amount of time it turns on the E-heat. Now there are other facts that could be involved, plugged filters, dirty coils inside and out, etc. Check your filters first to eliminate that problem.
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If you have a dual fuel system - gas/heat pump the heat pump should lock out at around 41 degrees depending on what the outside lockout sensor is set at. It may be that both the heat pump and furnace could be running at the same time if the outside lockout isn't working or there could be a problem with the thermostat. Best bet would be to have a service tech check it out. However if you want to check it out here are the terminals Terminations: R,Y1,Y2,W2,E,G,O,B,L,C. W2, E and B are the heating terminals for 2nd stage heat and emergency heat. First stage heat, compressor Y1 with B (reversing valve on heat pump) energized together. 2nd stage W2 energized for gas or electric heat . No power to Y1 and B when W2 is energized if gas. E can be energized with Y1 and B if you have electric heat or if you switch over to emergency heat, E will be energized.
Hi, what you have here is a ductless heat-pump split system. In the heat mode the compressor will run on a heat pump as it uses a reversing valve to reverse the flow of freon to heat your house. If it gets cold enough, the stat will call for the emergency heat strips to energize to come on for back up. Now, if the unit does not come on or go off when the thermostat calls for either heat or cool to come on and it just does it whenever it wants to, the stat will have to be replaced with a new one. If you plan on doing this your self, I would get the exact same heat-pump stat as you have because they make so many different models that the wiring may be much different and you will be lost when you go to wire it up. The heat - pump has many more control wires on them then the conventional heat/ac unit. So make it easy on your self and get the same one. They are easy to replace. If it is ignoring the settings its the stat. Heat strips and compressor running in the heat position together are normal for a heat- pump. Sincerely, Shastalaker7
Most heat pumps have an auxillary heat. Many are electric auxillary heat with a heat strip in the air handler. A common malfunction is for the electric auxillary heat to operate when the heat pump is set on cool. To confirm this, locate the conductor that runs from the heat sequencer to the connection on the heat strip. You will see this on the top section of the air handler. Use the clamp on part of the amp meter over that wire. If the thermostat is set on cool and the heat strip is drawing amps, it means the heat is coming on while the heat pump is set on cool. There is usually one or two causes for this, either the sequencer is bad or there is low voltage wires usually behind the thermostat or in the air handler closet that are touching that shouldn't be touching.
If this is not the case, if its not a problem of where the heat is coming on with the air conditioner, it could be a case of the reversing valve malfunctioning. The way a heat pump works is it reverses the flow of the refridgerant. For instance, many heat pumps the reversing valve is activated in cool. That would mean that there is a low voltage circuit that activates the reversing valve when the heat pump is in cool. I'm not sure what model/brand your heat pump is, Goodman and Janitrol for instance, the heat pump reversing valve is activated in cool. In any case, if the reversing valve is not operating properly, when the air conditioning is set to cool it will actually be heating. Or you could set it to heat and it may actually be cooling instead of heating. Please check these two items first and if you have any further questions, please let me know. Especially if you know of any additional problems like the evaporater is icing up or if the air handler fan is not operating when it should.
i would get someone to check your refrigerant levels have you ever had the evaporator coil flushed and cleaned? proper refrigerant levels and proper airflow across coils are extremley important not to scare you but 18 yrs is a long time on a heat pump 9-12 years is the point where they really loose there efficiency going for a newer one would probably cut your operating cost in half if not more depending where you live there are a lot of people not familiar with heat pumps so i suggest finding a company that specializes in them to service your unit
First when you add new vents make sure your unit is big enough to handle the extra load. If you have shut off your vents to the basement. and it does not cool you may have AC problem. Sounds like you need to get it checked. Ask for a free estimate before you commit anything. Remember if they add gas you have a leak and it should be found. Rus When your ac does not cool properly check filters float switch in unit. Breaker on outside unit. Take a thermometer and take a reading from the reurn to the closest vent you should have between 17 and 21 degrees diference across the coil. If you have electric heat or heat pump you may need have a heat sequencer stuckmkeeping part of the heat on during cool.
Check to see if you have the system switch accidently on em. heat. The way you have it wired is correct except for the having brown on e. disconnect brown wire and cut ofbare end just in case they have the wire hooked up for constant run on roof.
There should be electric heat strips in the airhandler.
They automatically come on when the unit goes into defrost, the thermostat is turned up more than 7 degrees over the indoor temp or if the outdoor temp is just so cold the HP cannot keep up.
Tat is your auxillary or emergency heat.
What does the new t-stats installers booklet say that the 0170 function and #2 #7 options are for?
If it is for gas vs elec heat then set it on the elec option.
The difference is that in gas heat systems the blower comes on a few min AFTER the furnace fires up to allow the heat exchanger to get hot.
In an electric furnace the blower has to come on emediatly because the heat strips get hot emediatly and if the blower is delayed the system will shut of in high temp overload.