1 2
THERMOSTAT CONTROL
OPERATION SN280TYA/SL280TYA The
thermostat control knob can be set to
any comfort level between HI and LO.
The thermostat will gradually modu-
late the heat output and flame height
from higher to lower settings, or pilot
in order to maintain the comfort level
you select. The ideal comfort setting
will vary by household depending upon
the amount of space to be heated,
the output of the central heating
system, etc.
Note: Selecting the Hi setting with
the control knob will cause the
burners to remain fully on, without
modulating down in most cases.
MANUAL LIGHTING
PROCEDURE
1. Follow steps 1 through 5 under
Lighting Instructions.
2. Depress control knob and light
pilot with match.
3. Keep control knob pressed in
for 30 seconds after lighting
pilot. After 30 seconds, release
control knob. Now follow step
8 in column 2.
INSPECTING BURNERS
C h e c k p i l o t f l a m e p a t t e r n a n d
burner flame patterns often.
PILOT FLAME PATTERN
F i g u r e 2 0 s h o w s a c o r r e c t p i l o t
flame pattern. Figure 21 shows an
incorrect pilot flame pattern. The
incorrect pilot flame is not touching
the thermocouple.This will cause the
thermocouple to cool. When the
thermocouple cools, the heater
will shut down. If pilot flame pattern is
incorrect, as shown in Figure 21:
t u r n h e a t e r o ff ( s e e To Tu r n
Off Gas to Appliance, page 11)
see Troubleshooting, pages 14
through 16
Figure 20 -Correct Pilot Flame
Pattern
Figure 22 shows a correct burner
flame pattern. Figure 23 shows an
incorrect burner flame pattern. If
burner flame pattern is incorrect:
turn heater off (see To Turn
Off Gas to Appliance, page 11)
see Troubleshooting, pages 14
through 16
CLEANING AND MAINTENANCE
Figure 21 -Incorrect Pilot Flame
Pattern
BURNER FLAME PATTERN
Figure 22 -Correct Flame Pattern
with Control Knob Set to High Flame
Figure 23 -Incorrect Flame Pattern
with Control Knob Set to High Flame
WARNING: Turn off heater and
let cool before cleaning.
CLEANING BURNER INJECTOR
HOLDER AND PILOT AIR INLET
HOLE
The primary air inlet holes allow the
proper amount of air to mix with the
gas. This provides a clean burning
flame. Keep these holes clear of dust,
dirt, lint, and pet hair. Clean these air
inlet holes prior to each heating season.
Blocked air holes will create soot. We
recommend that you clean the unit
every three months during operation
and have heater inspected yearly by a
qualified service person. We also
recommend that you keep the burner
tube and pilot assembly clean and
free of dust and dirt. To clean these
parts we recommend using com-
pressed air no greater than 30 PSI.
Your local computer store, hardware
store, or home center may carry com-
pressed air in a can. You can use a
vacuum cleaner in the blow position. If
using compressed air in a can, please
follow the directions on the can. If you
don't follow directions on the can, you
could damage the pilot assembly.
1. Shut off the unit, including the
pilot. Allow the unit to cool for
a t l e a s t t h i r t y m i n u t e s .
2 . I n s p e c t b u r n e r , p i l o t a n d
p r i m a r y a i r i n l e t h o l e s o n
injector holder for dust and dirt
(see figure 24).
3 . B l o w a i r t h r o u g h t h e
ports/slots and holes in the
burner.
4. Check the injector holder
located at the end of the
burner tube again. Remove
any large particles of dust, dirt,
lint, or pet hair with a soft cloth
or vacuum cleaner nozzle.
5. Blow air into the primary air
holes on the injector holder.
6. In case any large clumps of
dust have now been pushed
into the burner repeat steps 3
and 4.
C A U T I O N : Yo u m u s t k e e p
c o n t r o l a r e a s , b u r n e r , a n d
c i r c u l a t i n g a i r p a s s a g e w a y s o f
h e a t e r c l e a n . I n s p e c t t h e s e
a r e a s o f h e a t e r b e f o r e e a c h
u s e . H a v e h e a t e r i n s p e c t e d
yearly by a qualified service person.
H e a t e r m a y n e e d m o r e
f r e q u e n t c l e a n i n g d u e t o
e x c e s s i v e l i n t f r o m c a r p e t i n g ,
bedding material, pet hair, etc.
Figure 24 -Injector Holder on Outlet
Burner Tube
