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jaburke · Mar 18, 2009, 01:35 AM

How to connect low voltage wires from condensing unit ,thermostat and air handler with electric heat strip

KC13 · Mar 18, 2009, 01:55 PM

Don't you have the installation literature for the equipment? That would be the best resource if available.

jaburke · Mar 18, 2009, 04:10 PM

Originally Posted by KC13

Don't you have the installation literature for the equipment? That would be the best resource if available.

I purchased this equipment from a home owner that used it for 6 months. He replaced it with a higher seer unit. He misplaced all the literature on this system.

KC13 · Mar 18, 2009, 07:10 PM

Have you already installed the equipment? This is somewhat tricky territory - do you know how the system was uninstalled? Was the refrigerant pumped down and isolated within the outdoor unit, or recovered? Are the other components (indoor coil) sealed? If the equipment is already installed, was proper evacuation performed? Was a bi-flow filter/drier installed? This may seem like a lot of questions - because it is. As far as the control wiring is concerned, I need a little more info before I can help you. The thermostat - what terminal designations (letters) are present? Is it a electronic/digital type, or mechanical/analog type? How many/what color control wire connections are present at the indoor and outdoor units? P.S. Welcome to HVAC 101... ;)

jaburke · Mar 18, 2009, 07:58 PM

System was pumped down and all refrigerant lines were plugged. I reconnected the copper lines, pulled a vacuum down to 29 inches. Thermostate is a white rogers IF58W-72

jaburke · Mar 18, 2009, 08:09 PM

System was pumped down and all refrigerant lines were plugged. I reconnected the copper lines, pulled a vacuum down to 29 inches. A suction line filter drier and liquid line filter drier were added. Thermostate is a white rogers IF58W-72 terminal are G, R, L, X1 ,E ,B, W2, Y,O . Goodman Heat Pump , 4 Low voltage wires, R, W2, O, BL/common. Goodman air handler model aruf4860 with 10 kw heat kit. 5 low voltage wires, Red,Blue ,Green ,White, Brown.

KC13 · Mar 19, 2009, 03:51 AM

A suction filter can only be used with a heat pump system in the cooling mode to clean up a burnout, then must be removed. Operating the system in heating reverses vapor flow, which will be hot, and risks displacement of dessicant. Suction filters are not designed for this. There should be at least 5 wire connections at the outdoor unit - where is the "Y" circuit?

jaburke · Mar 19, 2009, 08:12 AM

There are 5 low voltage wires r,y,w2,o ,bl/com. The reason for the suction line filter drier is that I live in an under ground house and I will never need to run the system in heat mode. The temperature in my house never drops belew 65 degrees, even when outside temperature drops below 20 degrees. I just wanted to know for my benefit if when a house is in need of heat that it was wired correcty. This is the way it think it should be wired. R-from Stat, air handler and heat pump are all wired together. O- from Stat is wired to O- on heat pump. Y- on Stat is wired to Y- on heat pump. C/com from Stat, air handler and heat pump are wired together. W2 on stat and W2 heat pump are wired together with W on air handler an also a wire from W is wired to emerg heat on Stat. I do not think this heat pump has an out door stat,but if it does should be wired in series with the W -wires. If I ever decide that my old bones need some heat ,I will remove the suction line filter/drier. Thanks for your help. jaburke

wmproop · Mar 19, 2009, 11:21 AM

((quote))If I ever decide that my old bones need some heat ,I will remove the suction line filter/drier. Thanks for your help. jaburke

And at that time you will have to go through the whole deal of recovering the refrigerant,removal of filter/drier,pumping down the system all over again.
Sounds like a lot of trouble and expense,, GOODLUCK

KC13 · Mar 20, 2009, 03:30 AM

Sounds reasonable, but I would throw in these 2 wrinkles: 1) Use a non-heat pump thermostat and wire only the "R", "W", "Y", "G", and if necessary, "C" circuits to it. 2) Ditch the "O" circuit from the thermostat, and wire "O" to "R" at the outdoor unit, to assure the reversing valve is always in the cooling mode/position.