older Carrier reversing valve energized in cooling or heating?

[beenthere]

Someone could have replaced the reversing valve and put it in backwards! Haha.

Saw that one a few years back on a HP split system at a church.

The first Rheem/ruuds I ran into that reversed to cool. Were at a church. 2-10 tonners, and 1-5 tonner. At first I thought someone put an RV in wrong. Until I saw the wiring diagram.


But I installed 1 or 2 RVs backwards already. They have relays in the control panel now to make the system work right.

[mark beiser]

http://www.docs.hvacpartners.com/idc...0js,jx-1si.pdf

The only Carrier heat pumps I remember that energize the reversing valve in the heating mode OLD units, and had no O terminal. The RV was energized by W1, were run by relay logic(lots of relays, both 24 and 240v), and had electromechanical defrost controls.

Except their commercial 3 phase units(older ones that had the fans with the cables). Threw me for a loop some years ago.

That one has bit me too.

[Core_d]

If I can correctly recall, they use blue as the reversing valve and brown as common also. Crazy ruud/rheems!

Rheem/rudd. Common=x. C/O heat=B

[ComfortService]

Yea, I just installed new low voltage wiring from the unit to the thermostat on a 2 year old package heat pump rheem.

It was burning up a contactor in 4 days due to chattering.

The unit energized the RV in the heat mode. Kind of confused me for a minute because X (brown) was common and Blue (which is labeled D on the board) is the RV turn on.