Honeywell RTH8500D Owner's Manual - Page 19

Be sure to read the note referenced in the numbered

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Page 19 highlights

Step 7. Connect Wires to New Wallplate (Cont) 8. Compare letter designations on your old and new thermostats. Use the information below if you are wiring a HEAT PUMP System. Possible letter designations on the labeled wires HEAT PUMP letter designations on the new thermostat 1 2 VR or V or R 3 H or B, O Y1 or M or Y F or G 3 X or B, C F or L X2 or X, E 4 AUX, W1, W or W2 RC R O/B Y G C L E AUX M22210 Be sure to read the note referenced in the numbered triangles above. These numbered notes appear on the next page. 19 69-1725-1

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19
69-1725-1
Step 7. Connect Wires to New Wallplate (Cont)
8.
Compare letter designations on your old and new thermostats.
Use the information below if you are wiring a
HEAT PUMP
System.
Be sure to read the note referenced in the numbered
triangles above. These numbered notes appear on
the next page.
L
C
Y
R
RC
VR or V or
M22210
2
3
3
1
G
AUX
E
R
O
Y
G
C
L
E
W2
O/B
4
H or B,
Y1 or M or
F or
X or B,
F or
X2 or X,
AUX, W1, W or
HEAT PUMP
letter
designations on the
new thermostat
Possible letter
designations on
the labeled wires