Honeywell RTH9590 User Manual page 18

Installing your thermostat
Alternate wiring (Conventional System)
Use this if your wire labels
don't match the terminal labels.
Note:
You must have a C wire
or equivalent. See page 11.
69-2790ES—05
1
2
2
16
W
C
W1
C1 X B
Y
G
Rc
R
W2
R
RH 4 V
Y2
See key to –
1
MCR34541
on page 17.
2