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Wiring a 230V 3 phase heat pump

My three phase input on my breaker box has 3 black and one ground . My heat pump is showing specific color connections for each of the hot wires . How do I determine specific legs of three phase to connect properly or is this important?

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Re: wiring a 230V 3 phase heat pump

Yes, this is quite important when it comes time to turn the motor. in 3 phase, motor rotation direction is critical importance. however, it is a simple matter of trial and error if only a fan is involved...not sure of consequences if freon pump is turned backwards...may want to remove pump wiring try "bumping" the fan only...your method for this "fan only" is yours to figure out. try to set to "fan only" somehow then apply power. if fan turns backwards, the take any 2 black wires and reverse connections. fan should now turn in proper direction.

Posted on Nov 11, 2007

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Where can i obtain a wiring diagram

A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

May 04, 2015 | Air Conditioners

1 Answer

I need to know fuses box

Copy following link to see basic circuit breaker box.

It appears you are connecting home automation to to breaker box.
Remove one wire from each circuit breaker. Connect this wire to relay. Then run new wire from relay to circuit breaker.
When the relay turns ON, then that will complete circuit to each circuit.
This will work for 240 volt or 120 volt or 277 volt single-phase split phase..

Match wire size and circuit breaker

Nov 22, 2012 | Air Conditioners

2 Answers

How to convert the aircondition tanage in amp

I assume you mean tonnage. If you are looking for the amp amount to run a circuit to your aircond. here is rule of thumb: 2 ton is a 20 amp circuit (requires two 20 a breakers for a 230volt single phase unit)
3 ton is a 30 amp circuit (230v 1 phase)
4 ton is a 40 amp circuit (230v 1 phase)
5 ton is a 50 amp circuit (230v 1 phase)

all these require two breakers, and both breakers should be joined together.

May 11, 2011 | Air Conditioners

1 Answer

Should there be (3) red wires feeding the rooftop condensor? Is there a pdf of the wiring diagram I can get?

If you're talking about the high voltage wiring, the answer could be yes if it is a 3 phase unit. That means you have 3 separate legs of "hot". Many rooftop units are 230v 3 phase in the US. Single phase would have two hot wires and a ground. Look in the disconnect box. If there are 3 fuses you have a 3 phase unit. If you have 2 fuses, you have a single phase unit. Be careful, you are dealing with very high voltage and very dangerous.

Apr 11, 2011 | Air Conditioners

1 Answer

I just bought a used Carrier FV4BNB006 Air Handler without elec heat (just the air handler itself) . I pulled down the Installation instructions, but dang if I can find the right circuit breaker size to...

Hi, when you get the unit, it will tell you the Min. and max amps on the units data plate.They normally run in the 30 to 60 amp range depending on the tonnage of the air handler. What I would do, is run your lines now, and pick up a 60 amp disconnect box. You can use what ever size fuses in the box that the data plate says. Very easy to find out. Good Luck,
A/C, & Heating Contractor

Apr 01, 2011 | Air Conditioners

1 Answer

I have a goodman phkjo48-1 heat pump about 5 yrs old. suddenly no matter heat or air turned on only the fan would come on regardles,the main motor outside would not run. I took off the motor to have it...

Yes Jay, this is what happened. Hopefully you didn't burn out the condenser fan motor you just had tested.Brown normally connects to the capacitor, as this is what starts and keeps the motor running. Hopefully, it just got hot and overloaded to trip the breaker. You say there are 3 wires coming out of a junction box, but you don't remember how they go. @ are hot wires as this motor is 220 volts. Not being onsite with you, and the wires are now faded from the sun, you will need to find out where they connect, ( the 3 coming out of box ) to see which 2 go to most likely they contactor you replaced. They will connect 1 to the load side and the other to the load side but opposite each other. The load side is the side of the contactor that the main 2 hot wires dono't connect to. This is the line side in.If you are sure you wire the contactor right, then it has to be the motor. If you follow the brown wire back, it should go to the run capacitor. Re-check your connections on the motor, even if you have to look at the schematic, which will show you where they connect, and the colors. It should be real easy for you Jay. Get back to me and keep me posted. The new motors have 2 brn wires that go to the capacitor and 2 to 3 going to the load side of the contactor.
A/C, & Heating Contractor.
PS, Please rate me on my help to you. Thank you.

Feb 17, 2011 | Goodman PHKJ048-1 Air Conditioner

1 Answer

My AC unit has three wires, green, white red. Coming off the house and off the unit. How do I wire them!!

Hi, if you are talking about the wires,high voltage wires coming from the breaker box, and the same coming from the outdoor unit which are also high voltage wires, you have to set a disconnect box and mount it with in 3 to 5 feet from the outdoor unit. I am assuming you had no prior a/c unit there? If not, the 3 at the house must be ran out of your main breaker box through a breaker, double pole. It needs to match the rating of the voltage on the data plate on your unit, lets say, 30 amps. From your breaker box it needs to be ran through water tight conduit over to the box you will be adding there. Even though you have a green for ground, white and red, the white should be 120 volts and the red the same to have 220 volts. They will wire in this box to the line side. The directions in the new box will tell you line/power in and load/power out to new unit. This box you will need to buy is either a 30 amp or 60 amp disconnect. From the new unit, you will need to buy enough wire of the same size, and a piece of 3/4" seal tight flex conduit and 2- 3/4" connectors. Pull the 3 pieces of new wire through the flex conduit and connect to the 3 wires there. The green is ground so just connect it to a ground or the case. The other end will go through a knock out plug into the box and will connect to the load side. There will be a lug for the green ground. Coming from the house at the breaker box is where these 3 wires should be, and coming out of the breaker, you can use the 3/4" seal-tight to pull enough wire from there to the new box. This is what feeds your outdoor unit. This is just for the outdoor unit. The indoor unit runs on its own power source. There has to be a box mounted there also and wires pulled from the main breaker box to the indoor box. Hopefully who ever installed the unit has done all of this. If you have all of the boxes already there, just hook color to color. If you have never had a split system a/c unit at your home before and you are doing this yourself, there is a lot of high voltage wiring that has to be put in to run both the indoor and outdoor. Get back to me a let me know what you have to work with and if you have ever had a system like this before, and if you set the unit and installed the duct work.
PS If the indoor unit is gas fired, the high voltage will be 120 volts. If its a heat pump, it will be 220 volts.

May 25, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Mini Split Heat Pump wiring

Check to make sure it is single phase, should be stamped on unit. Is this wiring coming from what use to be there?

If you replaced the old unit with this one, you can trace the wires back to the breaker box. If you are Electrically inclined or you know someone who is.
Remove the panel and trace the nuetral and ground wire to the bus termination.

Some States require or use to require that the nuetral
and ground wire be tied together. 230 is 230v ,2hot and a ground.

My guess is you tie nuetral and ground together or
I wouldnt use white wire and I would disconnect
from both ends.

If you are uneasy about electricity, talk to a certified
electrician. Contact City Electrical Inspector. Dont get hurt!

Jan 21, 2010 | Air Conditioners

1 Answer

I am finishing the wiring in my basement a I have 1 receptacle with 2 14/3 wires in it and another with 1 14/3 wire into it. I need to figure out the 2nd circuit and how to finish off the plugs

With most receptacles, you can connect up to two (2) sets of wires to the one recptacle/outlet. Be sure the power is off to the circuits you're going to be working on, by turning off the breakers in the main panel that go to these circuits.

Strip back the outer jacket at 8 inches on the Romex wires and be careful not to nick the conductors inside the outer jacket.

With the black, white and bare ground wires now exposed and separated from the jacket, you can stirp off 1/2 inch of the insulation off both the black and white wires. You can also tear off the paper wrapper that covers the bare copper ground wires too.

Now take the ground wires and twist them together for at least 3 inches, making sure that you start the twist near the back of the outlet box, where the wires come into the box. Use a pair of lineman's pliers to twist the bare wires together. Once you've done that, you can clip off one (1) of the bare ground wires that is left sticking out, as you only need one to connect to the Green grounding screw on the receptacle/outlet.

Now connect the two (2) black wires to the brass colored screws, which is the HOT or common side of the outlet. On the other side, connec the two (2) white wires to the silver colored screws, as this is the Neutral side of the outlet. Now you can carefully bend the wires to let you push them into the outlet box and screw the outlet into the wall box. Put on the plate cover and you're all set. Turn the breaker back on and you've completed the wiring.

On the box with the single #14/3 wire (w/ground) just follow the instructions above, except you only have one wire to connect to each side of the outlet, matching them Black to brass screw and White to silver screw and the bare copper wire to the Green grounding screw.

Hope you find this Very Helpful and best regards.

Sep 20, 2009 | Air Conditioners

2 Answers

Voltage 1phase or 3 phase 240 volts BTUs M# 585epo36o75

Looking at the model number, it appears to be a 3 ton. (36,000 btu) Most all residential units are single phase and most all commercial are 3 phase. One way to tell, look to see if the compressor has a capacitor. 3 phase never use capacitors on the compressors as they are not needed. Some residential units have a "Dual" capacitor. That is, it has 3 terminals, 1 common, 1 for condenser fan motor, and 1 for the compressor. Also, this info should be printed on the unit's lable.
Good Luck and hope this helps.

May 09, 2009 | Amana Comfort Zone 12M32PBEH Air...

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