15. Replace thermostat cover by snapping into place.
16. Turn on power to system. Test thermostat as described in the
following section.
Step 3: Testing the Thermostat
WARNING:
DO NOT SHORT (JUMPER) ACROSS TERMINALS
OF GAS VALVE OR SYSTEM CONTROL TO TEST
OPERATION. THIS WILL DAMAGE THE
THERMOSTAT AND VOID YOUR WARRANTY.
CAUTION: DO NOT SWITCH SYSTEM TO COOL IF THE TEMPERATURE
IS BELOW 50°F (10°C). THIS CAN DAMAGE THE AIR
CONDITIONING SYSTEM AND CAUSE PERSONAL INJURY.
1. Place the EMER-HEAT-OFF-COOL switch into
the COOL position. The display will read COOL.
2. Press the
button until the temperature setting
is at least 3 degrees below the room temperature.
The air conditioning system should turn on within
a few seconds. The snowflake icon
will be displayed
(
1
st
stage cooling;
2
nd
stage cooling).
6
TERMINAL LEGEND - 9420
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
second stage cooling
Y1
First stage compressor connection
Yes
Energizes on a call for
first stage of heating and
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
second 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.
!
Содержание 9420
Страница 12: ...NOTES 12 ...
