Honeywell RTH8500 User Manual page 20

Installing your thermostat
Alternate wiring (heat pump system only)
Use this if your wire labels don't match the terminal labels.
Note:
You must have
a C wire or equivalent.
See page 13.
69-2715EF—07
Y2
L
5
E/AUX
6
AUX
K
7
18
HEAT PUMP
Metal Jumper
RC
R
O
Y
G
C
RC 1
R 2
O/B
3
Y 4
G
C 3
MCR33530A
See key to
1
on page 19.
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