Lanair DHI 300 - Manual (Page 39)

Section 3 - Chimney/Vent System
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14
17. If you are unable to attain the proper draft, check for exhaust fans in the building. To test
if there is a problem, open an overhead door and see if you now have the proper draft.
You may have to add one or more sections of “Class A” chimney to the roof to get the
proper draft.
18. The heater and chimney must be installed in accordance with all state and local
codes. The heater must be installed in accordance with the specifications listed in
this manual. The chimney must be installed per the chimney manufacturer’s
instruction. Use “Class A” chimney only.
Section 13 - Service / Maintenance
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39
Ignitor Replacement /
Adjustment
1. Disconnect power to the heater.
2. Remove the pre-heater assembly
from the burner housing.
Disassemble and clean all parts
as instructed on pages
34-37.
3. Using a 1/4" wrench, carefully
remove the one-piece ignitor
from the air pre-heater.
4. Install a new one piece ignitor
(P/N 3730) to the top of the air
pre-heater. NOTE: The tips of the
ignitor should be 3/8" above the
center of the nozzle assembly
and should extend approximate-
ly 1/8" beyond the end of the
nozzle. The tips of the one piece
ignitor should be 1/8" apart at
bend. Adjust as required and
tighten nut on the top of the
ignitor (see illustrations for clarifi-
cation of placement).
5. Re-assemble pre-heater assembly
(see pages 34-37) carefully re-
install the pre-heater assembly
into burner housing. The turbula-
tor should be approximately 1/4”
from the end of the burner tube.
Adjust as required and secure the
pre-heater assembly to the burn-
er housing by tightening the
adjustment screw on the side of
the burner housing (see illustra-
tion).
electrodes should extend approximately
1/8” beyond nozzle tip
3/8”
1/16”
Side View
Top View
1/8”