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S
XT I
, O
S
M
ERIES
NSTALLATION
PERATION AND
ERVICE
ANUAL
Selectrastat dial. The 7-day programmable
touchscreen thermostat provides nighttime setback
for unoccupied space heating.
AUTO/WINTER Mode:
Occupied time: Blower and burner cycle operate
continuously to maintain a constant space
temperature as selected on the Selectrastat dial. The
burner flame fully modulates and varies the
discharge air temperature to maintain the space
temperature.
Unoccupied time: Blower and burner cycle on and off
to maintain space temperature as selected on the
touchscreen thermostat (night setback).
ON/WINTER Mode:
Blower and burner operate continuously to maintain
a constant space temperature as selected on the
Selectrastat dial. The burner flame modulates and
varies the discharge air temperature to maintain the
space temperature.
ON/SUMMER Mode:
Only the blower operates continuously to provide
unheated air. The burner remains off regardless of
temperatures on the temperature selection dial and
thermostat.
FAN ON indicator:
Indicates that the air handler is supplying power to
the blower motor via the M1 motor starter.
BURNER ON indicator:
Indicates that the air handler has supplied power to
open the main gas safety shut off valve.
BURNER LOCKOUT indicator:
The burner control module has experienced a fault
and will need to be reset. The burner control module
must be reset at the air handler. Refer to Page 69,
Section 21 and Page 79, Section 23 to determine the
cause of the fault.
CHECK FILTER indicator:
The airflow in the air handler is insufficient to activate
the low pressure switch. This is most commonly
caused by dirty filters but could also indicate other
obstructions in the air stream.
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