Robertshaw 9555 User Manual page 6

110-975D En.qxd
TERM EQUIPMENT TO CONNECT
C 24VAC common connection
R 24VAC hot connection
Y2 Second stage cooling connection
Y1 First stage compressor connection Yes*
W1 First stage heat connection
W2 Second stage heat connection
G Indoor fan connection
O Accessory**
B Accessory**
* This thermostat can be used as a heat only or cool only thermostat therefore it is not always
necessary to use both W1 and Y1.
** The O and B terminals are accessory terminals that typically are used for zoning applications.
15. Set the GAS/ELEC switch to either GAS for a gas/oil heating sys-
tem or ELEC for an electric heating system.
16. A temperature limiting jumper has been included in this thermo-
stat. Cutting this jumper (J3) limits the heating setpoint to no
greater than 72°F and the cooling setpoint to no lower than 78°F
(Figure 7).
5/13/03 2:43 PM
TERMINAL LEGEND - 9555
NON
Figure 6
6
Page 6
REQ? TERMINAL FUNCTION
Yes For input of 24VAC common
side of transformer
Yes For input of 24VAC hot side
of transformer
No Energizes on a call for
second stage cooling (aux.)
Energizes on a call for first
stage of cooling
Yes* Energizes on a call for first
stage of heating
No Energizes on a call for
second stage heating (aux.)
Yes Energizes with W1, W2, Y1
and Y2 terminals or with
FAN option switched to the
ON position
No Energizes when in the in
COOL mode
No Energizes when in the
HEAT or EM modes
HP
GAS/ELECTRIC
Switch
(Black plate)