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6
12. Install two AA ENERGIZER
®
brand batteries or equivalent into battery
compartment. Be sure to match positive (+) ends of batteries with
positive (+) battery terminals in the battery compartment.
13. Replace cover on thermostat by snapping into place.
14. Turn on power to system. Test thermostat as described in the
following section.
TERMINAL LEGEND - 9620
TERM EQUIPMENT TO CONNECT REQ? TERMINAL FUNCTION
C 24VAC common connection Yes For input of 24VAC common
side of transformer
L System fault indicator connection No For connection of system
fault indicator (if present)
R 24VAC hot connection Yes For input of 24VAC hot side
of transformer
Y2 Second stage cooling connection No Energizes on a call for sec-
ond stage cooling
Y1 First stage compressor connection Yes Energizes on a call for first
stage heating or cooling
E Emergency heat connection No* Energizes on a call for heat
in the EM mode only
G Indoor fan connection Yes Energizes with E, Y1, Y2 and
W2 terminals or with FAN
option switched to the ON
position
W2 Second stage heat connection No* Energizes on a call for sec-
ond stage of heat (auxiliary
heat)
O Cool active reversing Yes** Energizes when in the in
valve connection COOL mode
B Heat active reversing Yes** Energizes when in the
valve connection HEAT or EM modes
* For systems using a backup heat source. If separate E terminal connection is not available,
jumper E and W2.
** Most heat pump systems will have a cool active OR a heat active reversing valve. Use the
appropriate terminal.