Help figuring out my HVAC system...

[RaptrFlite]

I have a Trane XR-13 Heat Pump(HP) outside with a
Carrier FC4BNF036 Air Handler(AH) inside. I am
tryting to figure the system out because I tried
putting in a new programmable thermostat.

Thermostat wires:
R, Blk, O, Y, Grn, W
Air Handler wires:
R---> Fan
Blk---> Fan and pass-thru to HP
O---> Pass-thru to HP
Y---> Pass-thru to HP
Grn---> Fan
W---> Heat strip? and pass-thru to HP
Heat Pump wires:
Blk---> a couple connections, common
O---> 9-pin (3x3) connector on board
Y---> 'Coil' connector on board
W---> 'Ambient' connector on board

I ohmed out the thermostat:
Heat: RH shorts to Y1 and W2
Cold: RC shorts to Y1, Y2, and O
Em. Heat: RH shorts to W1 and E


My thought was to wire the HP Coil wire to Y1
on the TS so it should be activated whenever
heat or cold are called for. Then wire O on the TS
to O on the HP for the reversing valve. The white
wire was going to what looks like a couple
heating coils in the air handler. I assumed this
was emergency heating since the HP should take care
of both heating and cooling, but it looks like the
signal is also passed through to the HP. The AH fan
and HP fan both run as expected they should. Cold air
(not ambient, but colder) comes out in cool mode,
but only ambient air comes out when heat is called for.

I know the White wire passed through to the HP is an
issue. The wiring diagram on the HP shows it going to
an 'Optional' circuit with a thermister. Perhaps when
Emergency heat is called for, the white wire activates
both the heating coil in the air handler, and turns on
the outside fan for air volume?

I would really appreciate some help with this as I've
spent HOURS tracking down the wiring.

Mike

[21degrees]

Are you in the trade or a home owner.

[bmathews]

You are not going to get any help in here from anybody. You will most likely take a beating and the thread will get closed.

[RaptrFlite]

Home owner, but an electrical engineer.

What would I take a beating for? I asked the question in an intelligent
and concise way.

[beenthere]

For not reading the rules of teh site.
Or this from the top of this page.

Questions and discussions pertaining to HVAC for the home. No pricing, no DIY, please read Site Rules

[beenthere]

Hate to tell you. But your not getting 13 SEER with that mismatch system either.

[skippedover]

Clearly things are being done to save money here. Wrong approach. You have a mis-matched system for starters, the people/person who installed the Trane outdoor unit did not do a Manual 'J' load calc and then replaced a non-matching outdoor unit with an existing indoor unit. From where I sit, that type of situation doesn't even warrant a second look. You need to find a company capable of that work and get your answers from them.

[Airmechanical]

give the guy a break, he is an engineer



.

[HeyBob]

Please read the site rules, there is a link in my signature line.