Desa SPC-21PHTSA - Manual (Page 7)

www.desatech.com 114082-01C 7
CLEANING AND
MAINTENANCE
WARNING: Turn off heater
and let cool before cleaning.
CAUTION: You must keep
control areas, burner, and circu-
lating air passageways of heater
clean. Inspect these areas of
heater before each use. Have
heater inspected yearly by a
qualified service person.
CAUTION: You must check
and keep burner/venturi tubes
clean of insect and insect nest. A
clogged tube can lead to a fire.
WARNING: Failure to keep
the primary air opening(s) of
the burner(s) clean may result in
sooting and property damage.
ODS/PILOT AND BURNER
Use a vacuum cleaner, pressurized air, or small,
soft bristled brush to clean.
BURNER PILOT AIR INLET
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, and lint. 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
compressed air no greater than 30 PSI. Your local
computer store, hardware store, or home center
may carry compressed air in a can. You can use a
vacuum cleaner in the blow position. If using com-
pressed 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.
Always keep the heater area clear and free from
combustible materials, gasoline and other flam-
mable vapors and liquids.
Keep the vent areas (slots in the bottom and the top
at the front of heater) clear at all times.
Visually inspect the pilot flame and burner peri-
odically during use. The burner should be bright
orange without a noticeable flame. If the burner
has a noticeable flame, cleaning may be required.
Use the following procedure to inspect burner
assembly.
It is necessary to periodically check the burner
orifice and burner venturi tube to make sure they
are clear of insects, nests or spider webs that may
accumulate over time. A clogged tube can lead
to a fire.
1. Allow heater to thoroughly cool before per-
forming any maintenance.
2. Turn control knob to the OFF position and re-
move disposable 1 lb. cylinder from heater.
3. Remove four screws securing burner assembly
to base assembly (see Figure 3, page 5).
4. Remove burner assembly from base assembly.
5. Inspect interior of burner assembly for ac-
cumulation of dust, lint or spider webs. If
necessary, clean interior with a vacuum
cleaner or apply air pressure. Do not damage
any components within burner assembly when
you are cleaning.
6. Inspect and clean main burner orifice by us-
ing a vacuum or apply air pressure at orifice
opening.
7. Inspect and clean pilot (mounted to bracket) by
using a vacuum or apply air pressure through
the air holes in the pilot (see Figure 4).
WARNING: Never use nee-
dles, wires, or similar cylindrical
objects to clean the pilot to avoid
damaging the calibrated ruby
that controls the gas flow.
Figure 4 - Pilot
Thermocouple
Burner
Ignitor
Electrode