Weather-Rite XT112, Installation, Operation & Service Manual

Page: 56 / 98

S
ERIES
XT I
NSTALLATION
, O
PERATION AND
S
ERVICE
M
ANUAL
50
Selectrastat dial. The 7-day programmable
to
u chscreen thermostat pro v ides nighttime setback
for u nocc u pied space heating.
AUTO/WINTER Mode:
Occ u pied time: Blo w er and b u rner cycle operate
contin u o u sly to maintain a constant space
temperat u re as selected on the Selectrastat dial. The
b u rner flame f u lly mod u lates and v aries the
discharge air temperat u re to maintain the space
temperat u re.
Unocc u pied time: Blo w er and b u rner cycle on and off
to maintain space temperat u re as selected on the
to u chscreen thermostat (night setback).
ON/WINTER Mode:
Blo w er and b u rner operate contin u o u sly to maintain
a constant space temperat u re as selected on the
Selectrastat dial. The b u rner flame mod u lates and
v aries the discharge air temperat u re to maintain the
space temperat u re.
ON/SUMMER Mode:
Only the blo w er operates contin u o u sly to pro v ide
u nheated air. The b u rner remains off regardless of
temperat u res on the temperat u re selection dial and
thermostat.
FAN ON indicator:
Indicates that the air handler is s u pplying po w er to
the blo w er motor v ia the M1 motor starter.
BURNER ON indicator:
Indicates that the air handler has s u pplied po w er to
open the main gas safety sh u t off v al v e.
BURNER LOCKOUT indicator:
The b u rner control mod u le has experienced a fa u lt
and w ill need to be reset. The b u rner control mod u le
m u st be reset at the air handler. Refer to Page 69,
Section 21 and Page 79, Section 23 to determine the
ca u se of the fa u lt.
CHECK FILTER indicator:
The airflo w in the air handler is ins u fficient to acti v ate
the lo w press u re s w itch. This is most commonly
ca u sed by dirty filters b u t co u ld also indicate other
obstr u ctions in the air stream.