Robertshaw 300-224 Installation And Programming Instructions page 22

OUTPUT TERMINAL FUNCTIONS – 300-229
4 events
Smart fan OFF
4 min. (on/off)
Unlocked
Electric
Single stage
LED #1 only
LED #2 only
LED1
300-229
LED2
RS2
RS1
RS+V
NO
COM OCC
NC
OFF ON
4 events
1
Smart fan OFF
2
4 min. (on/off)
3
Unlocked
4
Electric
Single stage
LED #1 only
7
LED #2 only 8
1 2 events
ON
2
2 min. (on/off)
3
Locked
4
Gas
5
Multistage
6
7 LED #1 with filter symbol
8 LED #2 with fault symbol
W2
Y2
W1
Y1
G
R
24V
24V(c)
O
B
2 events
ON
2 min. (on/off)
Locked
Gas
5
Multistage
6
LED #1 with filter symbol
LED #2 with fault symbol
W2.............Energizes auxiliary heat as second stage emer-
gency heat
Y2..............Energizes compressor #2 on a call for second
stage heating or cooling
W1.............Energizes auxiliary heat as last stage heating or
first stage emergency heat
Y1..............Energizes compressor #1 on a call for first stage
heating or cooling
G ...............Fan is energized with a call for heating or cooling
or by pressing the FAN button
R................Independent switching voltage*
24V ............24 VAC hot from the equipment transformer
24V(c)........24 VAC common from the equipment transformer
LED1 .........Free lights for status
LED2 or function indication
RS2 ...........Use to connect outdoor temperature sensor
RS1 and/or indoor remote sensor options. Refer
RS+V to the instructions included with the sensors.
O ...............Energizes the reversing continuously in the cool-
ing mode
B................Energizes the reversing continuously in the heat-
ing and off modes.
NO.............Relay coil is deenergized in the night
COM event. In all other events, the relay coil is
NC energized.
* Allows for DC operation required on some older Lennox
and McQuay units.
To replace a dual transformer system, connect the hot
lead of the higher rated transformer (T1) to the 24V ter-
minal. Connect the common to the 24V(C). Connect the
common of the second transformer to the common lead
of the T1 and tape off or wire nut the hot lead of T2.
W
22