Lanair DHI 300 - Manual (Page 5)

Section 1 - General Specifications & Hazards
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No. Description
1 8" Chimney Exhaust
2 Mounting Holes
3 Fan Hi-Limit Switch
4 Flame View Port
5 Burner Assembly
6 Electrical Power Box
7 Electrical Panel Access
8 Clean-Out Port Access Panel
9 Blower Assembly
Section 14 - Troubleshooting
QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST
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Symptom Possible Cause Corrective Action
C. Burner fires, and then 1. Contaminated fuel supply 1. Drain and clean fuel
fails on oil primary safety (water/anti freeze/gear lube) supply tank. Clean fuel
or dirty fuel filter. filter (see page 37)
2. Improper draft 2. Check draft see page 15.
Make sure chimney is
properly installed
3. Plugged heat exchanger, 3. Clean heater including
manifold, or chimney manifold and chimney
4. Wrong air pressure 4. See flame adjustment pages
29-31
5. Wrong fuel pressure or 5. See flame adjustment
pressure fluctuating pages 29-31. See fuel piping
page 17
6. Improper combustion blower 6. See flame adjustment
setting, or blower is defective pages 29-31. See fuel piping
page 17
7. Oil primary/cad cell defective. 7. Test components/adjust
Cad cell improperly adjusted. cad cell/ clean turbulator
Dirty flame turbulator.
8. Plugged nozzle or pre-heater 8. Clean nozzle and /or
assembly pre-heater assembly
D. Pre-heater assembly 1. Cartridge heaters defective 1. Test cartridge heaters
not heating or disconnected using an ohm meter.
Air heater 112
Ω ±10%.
Oil heater 37 Ω ±10%.
2. Snap disc defective 2. Test snap switch for
continuity if
pre-heater is cold
3. Hi-Limit snap disc defective 3. Replace snap disc assembly