Lanair DHI 300 - Manual (Page 21)

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21
Section 8 - Electrical Connections
Figure 7
Section 13 - Service / Maintenance
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32
DAILY
• Check fuel supply
tank level (pre-strain
all fuels).
• Check vacuum gauge
reading on suction
line. See Section 19.
• Check atomizing air
pressure at the air fil-
ter/ regulator. Set to
15 psi. Drain water
from the bowl if nec-
essary
• Check the fuel pres-
sure gauge on the
burner. Set to the
correct pressure for
the fuel being used.
• Visually inspect
flame. Adjust accord-
ingly. NOTE: Wear
adequate eye, face
and breathing pro-
tection.
• Check draft using a
manometer. Set draft
to -.02 cold, -.06 hot.
• If heater is not to be
used for more than
12 hours (overnight),
flip the pre-heater
rocker switch off
(light off ).
WEEKLY
• Drain water/ anti-
freeze from the fuel
supply tank.
• Check the air pres-
sure setting on the
primary air regulator.
Set to 30 psi.
• Drain water from the
air pressure supply
line drain leg and pri-
mary regulator.
• Inspect the combus-
tion, ash build-up
and flame.
NOTE: Wear ade-
quate eye, face and
breathing protec-
tion.
MONTHLY
• Check combustion
chamber and heat
exchanger. Clean if
necessary. Inspect
fire brick.
NOTE: Wear protec-
tive clothing, ade-
quate eye, face and
breathing protec-
tion. Do not
breathe dust from
the combustion
chamber. Wash
thoroughly with
soap and water
after cleaning
chamber.
• Clean the chimney,
chimney connector
and barometric
damper.
• Clean pump strainer,
suction line strainer
and pick-up tube
strainer (pp 33).
NOTE: Always prime
pump after cleaning
strainers.
• Check for dirt build-
up on the combus-
tion blower wheel.
Keep wheel clean.
ANNUALLY
(Season Shut Down)
• Shut off main power
supply to heater.
• Perform monthly
service/maintenance.
• Flip air/fuel pre-
heater switch off.
• Shut off air supply.
• Remove air/fuel pre-
heater assembly.
Disassemble and
clean. Replace all o-
rings (pp. 34, 35).
• Remove air turbula-
tor and clean (pp. 34,
35).
• Replace nozzle and
quad ring (pp. 34, 35,
39)
• Replace Ignitor (pp
38).
• Adjust turbulator (pp
38).
• Lubricate all motors
following specifica-
tions on the motor
rating plate.
• Clean fuel pump
strainer (see pp 33).
• Drain and clean fuel
supply tank.
• Clean combustion
blower, axial fan
blades and fan cage
DHI SERIES HEATER SERVICE / MAINTENANCE SCHEDULE