Robertshaw 8401 User Manual page 7

TERM EQUIPMENT TO CONNECT
R 24VAC hot connection
C 24VAC common connection
W1 Heat connection
Y1 Compressor Connection
B Heat active reversing valve**
O Cool active reversing valve**
G Indoor fan connection
* 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.
G O B
ELECTRIC/GAS SWITCH
Selects fan control.
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.
TERMINAL LEGEND - 8401
° F
C
R
NON_HP HP
Y1 W1
ELEC GAS
REQ?
Yes
Yes
Yes*
Yes*
No
No
Yes
HP OPTION SWITCH
Heat pump switch.
Figure 5
7
TERMINAL FUNCTION
For input of 24VAC hot
connection
For input of 24VAC
common side of
transformer
Energizes on a call for
heating
Energizes on a call for
cooling
Energizes when in the
HEAT mode
Energizes when in the
COOL mode
Energizes with Y1 & W1
terminals or with FAN
option switched to the
ON position