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INSTALLATION INSTRUCTIONS (cont)
REPLACING THE THERMO-
STAT ON SUBBASE
1. Position the thermostat on the
hinged tabs at the top of the
subbase.
2. Gently swing the thermostat
down and press on the bottom
center until it snaps into place.
THERMOSTAT COVER LOCK
You may lock the cover down to
prevent unauthorized access to
the thermostat by adding the
plastic lock (included in the instal-
lation bag). Insert the plastic lock
piece into the bottom of the
mounted base. The ends of the
lock piece fit snugly under the
lock pins extending from the bot-
tom of the mounted base. The
tab in the middle of the lock piece
extends down from the base.
To release the locking mecha-
nism, press the lock piece up and
into the base while gently prying
open.
WIRING DIAGRAM
Note: If the 24V(c) is not available from the equipment, the shunt may be
removed and a separate 24V transformer must then be used to power the
thermostat. To remove jumper (labeled JP1) from the printed circuit board,
pull straight out.
This thermostat may be used with 24 Volt DC. The negative side of the DC
supply must be wired to the 24V (c) terminal.
300-202
(for Release 3)
THERMISTOR MOUNTING INSTRUCTIONS
When placing the front cover on the thermostat ensure the
thermistor is not bent or misaligned.
Ensure that the thermistor does not touch the thermostat case.
The thermistor should be placed horizontal to the wall. Ensure the
thermistor is not pushed upward into the case.
The thermistor should be aligned so it is visible between the ribs
on the bottom of the subbase.
Outside rear view with backplate closed
TERMINAL DESIGNATIONS
Y2 . . . . . . Compressor is energized for 2nd stage heating or
cooling (if multistage is selected)
W1 . . . . . . Auxiliary heat is energized as back-up or
emergency heat
Y1 . . . . . . Compressor is energized with a call for heating or
cooling
G . . . . . . . Fan operates with a call for heating or cooling or by
pressing the FAN button
R . . . . . . .Independent switching voltage*
24V . . . . . .24 VAC hot and common to power the thermostat
24V(c)
O . . . . . . .Energizes the reversing valve continuously in cool
mode
B . . . . . . .Energizes the reversing valve continuously in heat or
off modes
RS2 . . . . .Use to connect up to 6 indoor and/or 1 outdoor
RS1
remote temperature sensor/s.
RS+V
When connected the thermostat will automatically use
the remote temperature sensor and not its own.
Refer to the instructions included with the sensor.
LED1 . . . .Free lights for status or function indication
LED2
CLK1 . . . .Use with dry contact relay or remote clock/timer
CLK2
for alternate setpoints
*Allows for DC operation required on some older Lennox and McQuay units.
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