Honeywell RTH7400D Owner's Manual page 18

Step 7. Connect Wires to New Wallplate (Cont)
7. Compare letter designations on your old and new
thermostats. Use the information below if you are
wiring a CONVENTIONAL System. Use the
information on page 20 if you are wiring a Heat
Pump system.
CONVENTIONAL
letter designations
on the new thermostat
1
RC
1
W2
Do not connect more than one wire to each
terminal. Be sure to read the notes referenced in
the numbered triangles above. These numbered
notes appear on the next page.
69-1726—1
R
W
Y
G
C
Y2
Possible letter
designations on
the labeled wires
or R
or RH, 4, V
or W1, H
or Y1, M
or F
or C1, X, B
18
2
2
3 4
M22208