Question about Samsung AS18A6RB Air Conditioner

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Emergency heat not working where is the heating elements located

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User manual:
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if you are using a hard wired thermostat, you have one designed for a heat pump. Heat pumps are minimally effective at outdoor temperatures below 30'f. Emergency heat systems are not generally included with any split system, but would be located in the indoor air handler.

Posted on Nov 20, 2013

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I have a 1800 pioneer heat pump after about 10 minutes it switches to EC I have to go to my panel and a witch it back on Why?


Emergency heating via heat elements will only run till temps get to a certain point then the elements turn off and the heart pump takes over and that is the economy setting. Emergency heat is used to quickly raise temps then heat pump takes over. The elements are very expensive to power ergo the switchover.

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I have a thermostat RTH9580. Why do I have emergency heat under system AND heat which sometines switch automatically to auxilliary heat?


If you have an air to air heat pump, in colder temperatures, the heat pump will not heat as well as it would in warmer outdoor temperatures making it run longer. the digital thermostats work off of a built in algorithm that kicks on the auxiliary heat when the heat pump runs to long so that it will satisfy the thermostat quicker. This can be tied to the Emergency heat @ the thermostat energizing a few heating elements, or just energizing a separate element from the emergency heat. I always recommend on an air to air heat pump to run the emergency heat when you have consistent Outdoor temperatures below 20 degrees F because you will cycle the heat less by getting hotter heat making life more comfortable, and it costs about the same as running the heat pump since @ those temperatures, it will run all the time.

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If the compressor is off and the heat coil is on - this is normal for the "E" or emergency heat setting. Check for proper connections between the Heat-pump, furnace(heat source) and the thermostat and that the thermostat is capable of controlling a heat-pump with secondary/emergency heat units. Thermostats designed for this have 4 settings: Cool / off / heat / E(emergency heat). in the "heat" setting, both the Heat-pump and Aux heat work together to maintain temperature. In the "E" setting, only the Aux heat source is used. The "E" setting should only be used in extreme cold - when the Heat-pump can no longer produce heat.

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1 Answer

RUDD Model UBHC-21J18SFA: Emergency heat not automatically engaging. Used to work, now I must manually turn the thermostat to "Emergency Heat" to get the elements to engage. What's broken?


Sounds like your Auxillary heat is out (the element that is energized when an air to air heat pump can't keep up with the thermostat setpoints).

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1 Answer

I JUST BOUGHT THIS UNIT IT HAS THE OUTSIDE UNIT AND THE INSIDE UNIT AND I WAS TOLD THAT THE HEAT PACKS IN THE INSIDE HANDLER IS FOR EMERGENCY HEAT ONLY...IS THIS TRUE?


Yes, if you are talking about a heat pump. It you have an electric furnace inside, the electric elements are for emergency heat. Otherwise, unless you switch it manually at the thermostat, the heatpump (outdoor unit) will run all year around. If you want to use your inside heater (electric heater) just switch your thermostat to "emergency heat" and it will turn on the electrical elements instead of the outdoor unit. This way will make your elec. bill higher tho. The heat pump is much more efficient. Hope this helps you , have good day

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1 Answer

Unit set to heat but outside unit fan won't turn on. Outside temp is below freezing. The weird thing is that you unit is putting out heat and not set to emergency heat


If it is a heatpump, the outside unit should not turn on below 35degrees or so. Below that temperature, the unit cannot effeciently exchange heat. When the outside temperature is low, the system automatically switches over to auxillary heat which uses the same heating elements as emergency heat.

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1 Answer

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It sounds like you have a "setback thermostat" A control intended to increase efficiency by allowing the fan to run for an adjustable amount of time after the heater turns off, whether the heater is electric or part of a heat pump. If the "setback" time is too long, the element will cool off and the fan will blow cold air. Try and locate the instructions for the thermostat and see if the "fan run time after heat turn off" is adjustable and reduce it by half. Most emergency heat circuits bypass control circuits (its an emergency, you know), and require manual control.

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Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

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Abbreviation definitions.


Economy Mode = EM
Auxelary Mode = AUX
in em mode heat pump does most of the work in aux either an electric heating element is used or gas depending on if it is gas or all electric

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