Question about Ruud UAKA042 Air Conditioner

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Is ruud heat pump model upka-042jaz a single or multiple stage pump?

Tech changed thermostat settings before fixing capacitor on air handler, now outside unit does not come on. want to correctly re-program thermostat.
thanks

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  • Anonymous Jul 20, 2008

    We have electricity to the outside part of the heat pump and have checked the breakers inside and outside the house but the unit doesn't turn on. What else can we check?

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I NEED THE MAKE AND MODEL OF THE T-STAT TO HELP YOU
DID HE CHANGE ANY WIRING?

Posted on Jan 17, 2008

  • Zeljko Nikic Sep 02, 2013

    How I know howmany tons have my unit outside model upka 042jaz

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1 Answer

How many tons does a Ruud heat pump have , Model UPKA -025JAZ?


depends on what air handler its paired with, likely 2 ton. possibly 2.5

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Mar 27, 2018 | Ruud Heating & Cooling

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Thermostat wiring terminals and colors


R - The R terminal is the power for the thermostat. This comes from the transformer usually located in the blower section for split systems but you may find the transformer in the condensing unit. For this reason, it is a good idea to kill the power at the condensing unit and the blower section before changing or working on the wiring at the thermostat. If you have a package unit then the transformer is in the package unit.
Red for the R terminal.

RC - The RC terminal is designated for the power for cooling. Some HVAC systems use two transformers. A transformer for cooling and a transformer for heating. In this case the power from the transformer in the blower section would go to the thermostat terminal. It should be noted that a jumper can be installed between RC and RH for a heating and cooling system equipped with a single transformer.
Red for RC terminal.

RH - The RH terminal is designated for the power for heating. See RC above for an explanation. It should be noted that a jumper can be installed between RC and RH for a heating and cooling system equipped with a single transformer.

Y - This is the terminal for cooling or air conditioning and goes to the compressor relay. Typically a thermostat wire pull is made to the air handler on split systems and then this wire is spliced for the separate wire pull which is made to the condenser. Some manufacturers put a terminal board strip near the control board in the air handler so a splice is not needed.
Yellow for Y Terminal.

Y2 - This is the thermostat terminal for cooling second stage if your system is so equipped. Many systems only have a single compressor but if you have two compressors which should only operate off of one thermostat then you need the Y2 thermostat terminal for second stage cooling.
*The most common color I've seen used for this terminal and wire designation is light blue but this varies and is completely up to the installer what color to use. Most installers use the color coding as noted but be aware that some do not use the thermostat color coding.

W - This is the thermostat terminal for heating. This wire should go directly to the heating source whether it be a gas or oil furnace, electric furnace, or boiler,
White for W Terminal.

W2 - This is the thermostat terminal used for second stage heat. There are gas furnaces with low fire and high fire and some depend on control from a two-stage heating thermostat with a W2 terminal. Heat Pumps use staging for auxiliary heat and need a W2 terminal.
*The most common color I've seen used for this terminal and wire designation is brown but this varies and is completely up to the installer what color to use.

G - This is the thermostat terminal used for the fan relay to energize the indoor blower fan. On a split system the blower fan is in the blower section while with a package unit the blower fan is in the outdoor package unit.

Green for G Terminal.

C - This is the thermostat terminal which originates from the transformer and is necessary to complete the 24 volts power circuit in the thermostat but only if the thermostat consumes electricity for power. Many digital thermostats require 24 volts for power so the common wire is necessary.
C stands for common and there is no universal color used for this terminal although black is the most common color I've seen.

O or B - These thermostat terminals are for heat pumps and the B thermostat terminal is used on for Rheem or Ruud and any manufacturer that energizes the reversing valve in heating mode for the heat pump. Most other manufacturers of heat pumps will utilize the reversing valve for cooling and the O thermostat terminal will be utilized for this purpose. This wire goes to outside heat pump condenser where the reversing valve is located.

Orange for O and Dark Blue for B depending on the installer of the heat pump and the manufacturer. If you have a Trane, Carrier, Goodman, Lennox, Ducane, Heil, Fedders, Amana, Janitrol, or any other manufacturer other than Rheem or Ruud you will be utilizing the orange wire for reversing valve. Rheem and Ruud will usually utilize the blue wire for reversing valve.

E - This thermostat terminal is for heat pumps and stands for Emergency Heating. If for whatever reason the heat pump condenser fails and it is necessary to run the heat there is an option on heat pump thermostats for emergency heating. Basically this simply utilizes the back-up heat source many heat pumps have to heat the home without sending a signal to the condenser to run for heat.

E - There is no universal color used for this thermostat terminal designation but this should be wired directly to the heating relay or the E terminal on a terminal strip board in the air handler or package unit if you have a heat pump package unit.

X or Aux - This thermostat terminal is for back-up on a heat pump and allows for auxiliary heating from the back-up heat source usually located in the air handler.

X or Aux - There is no universal color used for this thermostat terminal designation but this should be wired directly to the heating relay or the Aux terminal on a terminal strip board in the air handler or package unit if you have a heat pump package unit.

S1 & S2 or Outdoor 1 and Outdoor 2 - Some thermostats have this terminal and it used for an outdoor temperature sensor. The wire uses for this should be special shielded wire and completely separate form the other thermostat wires.







on Jun 06, 2011 | Heating & Cooling

1 Answer

I have a RUUD UPKA-036jaz heatpump. Anytime the thermostat is set to heat, the reversing valve coil is energized. Even if the unit isn't running. Is that normal?


Most heat pump reversing valves energize in cooling. Does it ever "deenergize". If not its stuck, if it does check programming, may be setup to operate that way. Or possibly wired wrong or wired as straight cool. To answer your question, i dont think that is normal.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Nov 08, 2016 | Ruud Heating & Cooling

1 Answer

I have a Ruud air handler and i'm trying to use a


The 44360 tstat can be used for single stage Heat pump use only. Unless you are in an environment that has greater than 40 degF outdoor temperatures year-round, you will want to return that tstat and obtain a multi-stage Heat Pump tstat. The standard system is 2-stage......1st stage is Heat Pump Compressor and 2nd stage is the backup electric heat.

Hope this helps. Good Luck. :-)
http://www.hunterfan.com/uploadedFiles/Support/Downloads/42710.pdf?n=149

Feb 21, 2010 | Heating & Cooling

1 Answer

RUUD HVAC UNIT - HEAT STRIPS COME ON WITH THE A/C


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

Feb 03, 2008 | Ruud Handler Air Conditioner

6 Answers

Wiring connection for a Ruud air handler & seeking its wiring diagram.


we are trying to install a goodman heat pump with a rheem air handler, the orange wire is hook up and the unit is still staying in the heat mood. does anyone have a wiring diagram for the air handler, their is some white wires in the air handler one with a purple strip and one with a black strip we need help

Jan 05, 2008 | Heating & Cooling

1 Answer

Outside unit does not come on in Summer


YOUR MODEL HAS A 3-5 MIN.TIME DELAY RELAY IN THE CONDENSER CONTROL PANEL OUT-SIDE. DO NOT ATTEMPT TO FIX-IT YOURSELF ... THERE I SAID IT. IT IS WIRED INTO THE 24VOLT CONTROL CIRCUIT. THEY DO GO BAD AND OFTEN. IT IS THERE FOR A GOOD REASON. IT GIVES THE COMPRESSOR TIME FOR THE PRESSURES TO EQUALIZE INTERNALLY TO PREVENT "HARD START CONDITIONS". RUUD HAS A GOOD WARRANTY ON ALL PARTS 5-6 YEARS I BELIEVE. IF IT IS THE TIMER IT IS INEXPENSIVE ANYWAY. GOOD LUCK

Mar 25, 2007 | Ruud UAKA042 Air Conditioner

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