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York Heat Pump Model E1HB030S06A --- Need 2 things: Wiring Diagram for entire outside unit and Defrost board (ST74C1002) ... do not know if this defrost board (currently on the heat pump) is an original part.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 54 Answers

SOURCE: RUUD Central Air/Heat Pump

Start with the simplest first it,s not fun but it's necessary EVERY TIME. Clean your evaporator and condenser coil, change your air filter. Getting to the evap. coil is often a real headache and a result doesn't get done often. When its clogged as you probably know the refrigerant can't absorb heat at the coil so it tries to absorb heat on the way to the compressor freezing the hot gas line the safety circuits that protect the heat pump compressor from getting liquid refrigerant back to the compressor almost immediately will take the compressor of line (looking somewhat like a defrost cycle). I hope this helps it's a tough repair GL!

Posted on Jun 08, 2008

  • 182 Answers

SOURCE: Ruud Heat Pump

this may indicate you have low voltage but no high voltage.check fuses and breakers.

Posted on Aug 09, 2008

  • 1214 Answers

SOURCE: tempstar heat pump: want to bypass defrost thermostat

Don't attempt to bypass defrost mode. If it's cold enough to use as a heat pump, it's cold enough to need the defrost cycle.

It sounds like a sensor issue, although it may be the controller board.

Unless you know how to work on equipment like this, I urge you to get a professional to service the unit for you.

Posted on Jan 22, 2009

pierre1811
  • 144 Answers

SOURCE: Goodman Heat Pump freezing up

In your climate usually the defrost timer would be on 90. However if you are in an upper elevation and it gets colder then set it at 60. what model unit do you have? Did they change both indoor and outdoor units? I would have to know the model # to tell if the fan should run in defrost. In most cases I would say no.

Posted on Jan 23, 2009

  • 1 Answer

SOURCE: Wiring Diagram for Ruud Heat Pump

Unfortunately, the wiring diagrams for heat pumps are not so easy to come up with. The outdoor unit will have its own diagram, but may not include the indoor air handler and will probably not include the thermostat. That said, the orange wire is commonly run from the thermostat to the reversing valve in the outdoor unit. This wire is usually not connected to the indoor airhandler. The orange wire is usually used in a unit that has the reversing valve energized in cool. Ruud, however has its reversing valve energized in heat. Probably not useful but maybe helpful
Mike

Posted on Mar 26, 2009

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Heat Pump Blowing Cold


Unless you just installed or had the thermostat installed recently, I would not point at the thermostat as the problem. With what you have described I would suggest have your units serviced as it sounds like a loss of charge, or failed defrost control board. The "Aux" comes on when the unit is using secondary heating (electric heat strips). That occurs when the demand temperature (what you set it to) in Heat mode is more than the current room temperature, usually ~2-4 degrees higher. Also happens in defrost mode. Defrost is a heat pump cycle that melts any build up of ice on the condenser unit (outside unit). That process is simply the unit running in cool mode which will heat up the outside unit to melt any ice. Defrost cycles vary with manufacture but usually you can tell if is in defrost by looking at the outside unit, during defrost the unit will be warm or hot sometimes there is steam and the compressor will be running but not the fan. Defrost only happens on heat pumps in "Heat" mode. Rheem has a 10 yr compressor and parts warranty, so call the installer or Rheem authorized service company.

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1 Answer

I have an armstrong heat pump and am curious about how the defrost cycle works.


Rather lengthy but here it is.
The outside unit(heat pump) has a reversing valve, a defrost board, a crankcase heater, a metering device(txv or piston) and an accumulator. This is what makes it a heat pump instead of a straight air condensing unit.
When in the heat mode the outside unit becomes the evaporator and the inside unit becomes the condensing unit.Before somebody corrects me i am just stating what is different in a heat pump.
When the system goes into defrost several things happen. First the system has to call for a defrost cycle. This happens on a time and temperature sequence. When the defrost board times out for a defrost check(the defrost board has a jumper pin to determine how long before the system will check for a temperature(thermal switch) is open or closed. This switch is in the normally open position. It will close at 35 degrees(depends on the switch). This switch is located on the copper line in the condensing unit. If this switch is closed then the system will go into defrost. Now for the good part. This will shut down the outside fan, switch the reversing valve, and the outside unit will essentially go into cool mode. Because the fan is off the compressor will heat up very rapidly and the refrigerant passing thru the coils will be hot as well. This will cause the ice buildup on the outside unit to melt(defrost). This will continue until a temperature is met or it times out. Then the system will return to the heat cycle. One other thing, depending on how your system is wired the inside unit will turn on the auxillary heat while the defrost cycle is in process. That way you will still have heat while the defrost cycle is in process.
It is not uncommon for steam to come out of your outside unit while this is going on. It can also be quiet noisey sometimes.
Hope this explains what you wanted to know. If not just reply to this with any other question you have about the cycle.

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1 Answer

My sister has a Ruud Achiever High efficency heat pump Model UPLA-049JAZ Serial #6408-M389910353 they just moved into this house in ND and have no information on this system..Over the winter it was...


There are 3 possiblites

1. you have a bad defrost board or defrost sensor.

2. Your low on Freon.

3. Your coils and/or your Filter is dirty.

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I believe the unit you are describing is a heat pump. Heat pump are great when the temperature isn't below 30 With low ambient temps. outside it is much more efficient and comfortable to run aux. electric heat from the heat pump.

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Armstrong Heat pump Package Unit, Model#1B36DA-9B,


Hi, the outdoor unit will start to freeze when it is cold outside, but also it should go into a defrost mode to melt this ice either by the defrost board or defrost thermostat. You will know as steam will rise like smoke and some folks think it is on fire. If it never goes into defrost, get back to us and we can go through some things to check. Merry Christmas,
Shastalaker7

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You should call a professional in on this one you can damage alot of expensive parts trying to do this on your own without the proper tools and knowledge of the control logic

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yes i can , you need to hookup the r and the o together so that the reversing vvalvce is allways energized . so with that im mind send r,y,c,o to theout side unit. at the ahu you'll hook up the 5 wires for the furnace, r g w1 w2 com and at the thermostat r,w1,w2,y,g,com,o then you will be set (the o get hooked up to o and goes straight out side.

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1 Answer

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ok Let me see if this helps if not please comment back with the t-stat model and make as well. The Y terminal on the t-stat needs to be connected to the Y terminal on the heat pump board. If this does'nt fix it your thermostat may have something different going on so please send me the model and make of the t-stat. Also if you know does this unit have outside temperature sensing probes, and or an automatic defrost cycle?

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What you are talking about I think are the strip heaters in the Air Handler this must be a Heat Pump system right??? If so please check your thermostat and make sure it is not in EMRGY HEAT mode.. One other note there is a 2 stage bulb system inside the stat if it is too cold outside and the heatpump on its own cant keep up with the call for heat the 2nd bulb closes and turns on the heater as a supplumnetal heat also these will come on or should come on when the unit goes into defrost.. plz let me know what it is you are trying to test and i can walk you thru it.. Also need a model # off the A/H to get a Wiring diagram

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