Trane Thermostats - Page 3

BAS-PRC036-EN 3
Wire Terminals
Label Description
Non-Programmable Programmable
1Heat/
1Cool
3Heat/
2Cool
3Heat/
2Cool
Touch
Screen
(O/B)W (Changeover valve)
(a)
Heat relay

(Aux/E)W2 (Auxiliary or Emergency heat relay)
(a)
Second stage heat
(a) Text in parentheses applies to only heat pump systems.

(W1)W2 (Emergency heat relay)
(a)
Second stage relay

A Economizer relay

C Common

Dh Dehumidify relay

G Fan relay

Hp External humidity sensor power

Hs External humidity sensor input

(L) (Emergency heat indicator relay)
(a)

R 24 Vac heating

Rc 24 Vac cooling

S1 External temperature sensor

S2 External temperature sensor

Y Stage 1 compressor control relay

Y2 Stage 2 compressor control relay
