Desa HDVF3018P User Manual

www.desatech.com

119421-01A

INSPECTING bURNERS

Check pilot flame pattern and burner flame pat-

terns often.

pILOT FLAME pATTERN

Figure 24 shows a correct pilot flame pattern. Figure

25 shows an incorrect pilot flame pattern. The incor-

rect 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 25

• turn heater off (see To Turn Off Gas to Ap-

pliance), page 18

• see Troubleshooting, page 21
Note:

The pilot flame on natural gas units will

have a slight curve, but flame should be blue and

have no yellow or orange color.

BURNER pRIMARY AIR HOLES

Air is drawn into the burner through the holes in the

fitting at the entrance to the burner. These holes may

become blocked with dust, lint or pet hair. Periodi-

cally inspect these holes for any blockage and clean

as necessary. Blocked air holes will create soot.

MAIN BURNER

Periodically inspect all burner flame holes with the

heater running. All slotted burner flame holes should

be open with yellow flame present. All round burner

flame holes should be open with a small blue flame

present. Some burner flame holes may become

blocked by debris or rust, with no flame present. If

so, turn off heater and let cool. Remove blockage.

Blocked burner flame holes will create soot.

Figure 24 - Correct Pilot Flame Pattern

Figure 25 - Incorrect Pilot Flame Pattern

Thermocouple

Pilot Burner

Thermocouple

Pilot Burner

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 quali-

fied service person. Heater may

need more frequent cleaning due

to excessive lint from carpeting,

bedding material, pet hair, etc.

WARNING: Failure to keep

the primary air opening(s) of

the burner(s) clean may result in

sooting and property damage.

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

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.