Chromotherm III Wiring
 

Need to install Model T8600C1196 from a Carrier Weathermaster III F/A heatpump/ac system c/w gas supplementary heat to a Carrier F/A heat pump/ac system c/w electric supplementary heat. Original wiring was to W, G, R, Rc and Y screws with O, C, B vacant. Can I assume I need to connect electric HP wiring white to W, green to G, red to R, ? to Rc, and yellow to Y? Remaining wires are orange, black, purple, brown, blue.

Please advise if this is feasible and the correct wiring.

Thanx!!!

I don't see how you could have run a heat pump with supplemental heat with just W,G,R,Rc and Y. W brings on the heat relay, R is common power, Rc is common power from the cooling transformer, and Y energizes the cooling relay, there was nothing to bring on the reversing valve. A heat pump needs o or b to bring on the reversing valve relay depending on changeover configuration. Post back with models numbers of all equipment you are trying to hook up.

Chromotherm wiring
 

Thanx Big Mike> I now recall that the same TS was originally used to control a heat pump/ac and then modified AFTER the heat pump was disconnected (due to erratic operation) and converted to a straight ac function. I surmise the tech removed the O, C and B screws to reflect this. I will post back the data on the electric furnace (in another building!) that I am trying to install the Chromo III to. Can I assume the wiring color codes are standard as to function?
Appreciate your interest.

Color codes not so much standard, terminal designations yes. Colors depend on what the installer had to work with.

Chromo III Wiring
 

Greetings Big Mike: Just back from extended vacation. Target electric furnace is Carrier Mod. 40AQ01831080 Ser: 0990A06708. Existing theromstat connections at furnace are: Wh to C; Blue to E; Blk to W2; Red to R; and Green to G; W3, Y, O, V2 and L are vacant. The Chromo III has O, W, G, C, R, Rc, B, and Y connection posts. Can you advise correct wiring at thermo end? Much appreciated.