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13. Make sure wire connections are secure.
14. Push excess wire back through opening.
15. Set the Electric/Gas switch to either GAS for a gas/oil heating
system or ELEC for an electric heating system (Figure 5).
16. Set the HP option switch to either the HP for heat pump or
NON_HP for furnace applications (Figure 5).
17. Replace thermostat cover by snapping into place.
R
C
GOBY1W1
ELEC GAS
NON_HP HP
°
F
Figure 5
TERMINAL LEGEND - 8401
TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION
R 24VAC hot connection Yes For input of 24VAC hot
connection
C 24VAC common connection Yes For input of 24VAC
common side of
transformer
W1 Heat connection Yes* Energizes on a call for
heating
Y1 Compressor Connection Yes* Energizes on a call for
cooling
B Heat active reversing valve** No Energizes when in the
HEAT mode
O Cool active reversing valve** No Energizes when in the
COOL mode
G Indoor fan connection Yes Energizes with Y1 & W1
terminals or with FAN
option switched to the
ON position
* This thermostat can be used as a heat only or cool only thermostat. Therefore it is not always
necessary to use both Y and W.
**The O and B terminals are accessory terminals that typically are used for heat pump applications.
ELECTRIC/GAS SWITCH
Selects fan control.
HP OPTION SWITCH
Heat pump switch.
110-1087B.qxd 3/4/05 4:00 PM Page 7