Robertshaw 9555 - Manual (Page 6)

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).
6
GAS/ELECTRIC
Switch
W1
Y1
B
O
G
W
2
Y
2
NON HP
Figure 6
TERMINAL LEGEND - 9555
TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION
C 24VAC common connection Yes For input of 24VAC common
side of transformer
R 24VAC hot connection Yes For input of 24VAC hot side
of transformer
Y2 Second stage cooling connection No Energizes on a call for
second stage cooling (aux.)
Y1 First stage compressor connection Yes* Energizes on a call for first
stage of cooling
W1 First stage heat connection Yes* Energizes on a call for first
stage of heating
W2 Second stage heat connection No Energizes on a call for
second stage heating (aux.)
G Indoor fan connection Yes Energizes with W1, W2, Y1
and Y2 terminals or with
FAN option switched to the
ON position
O Accessory** No Energizes when in the in
COOL mode
B Accessory** No Energizes when in the
HEAT or EM modes
* 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.
110-975D En.qxd 5/13/03 2:43 PM Page 6 (Black plate)