Lanair DHI 300 - Manual (Page 38)

Section 4 - Draft
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15
Figure 3
The Lanair heater should have a (negative) -.02 draft reading when cold, and a (negative) -.06
when hot. Check the heater when it is running after 45 minutes. If the reading is not what it
should be, adjust the barometric damper according to the instructions provided with the
damper. The draft reading should be taken with a manometer. Consult your heating contrac-
tor, or a manometer can be purchased from the Lanair Customer Service Department .
Section 5 - Fuel Supply Tank Installation
Section 13 - Service / Maintenance
QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST
38
bolt
washer
o-ring
inlet 1” NPT
outlet 1” NPT
strainer
strainer
hex cap screws
gasket
gasket
o-ring
spring
bowl
water drain
Cleaning Suction Line Strainer
The suction line strainer should be cleaned
every 30 days of operation. The element is
a washable metal element. If your waste oil
is extremely dirty, this strainer may need to
be cleaned more frequently. Your vacuum
gauge will help you determine when the
filter needs cleaning. The vacuum gauge
reading should not exceed 5" HG of
vacuum. If it does, the strainer needs
cleaning.
1. Disconnect power to the heater.
2. While holding the lower housing,
unscrew the center bolt on the top of
the suction line strainer.
3. Rinse the filter and lower housing in
solvent.
4. Air dry the strainer and lower housing.
5. Re-assemble the strainer, ensuring the
rubber gaskets, spring and o-rings are
in place.
6. Fill the lower housing with waste oil or
fuel oil.
7. Position the lower housing to the top
making sure the o-ring is properly seat-
ed. Secure the top and bottom togeth-
er using the bolt, washer and gasket
removed earlier.
8. Prime the fuel pump (see page 25).
Cleaning/Replacing Fuel Pump
Strainer
1. Disconnect power to the heater.
2. Remove four hex head screws from
pump cover. Carefully remove cover,
strainer and gasket.
3. Clean housing, strainer and pump sur-
face. Check for excess wear.
4. Install a new gasket (P/N 9817).
5. Install strainer and pump housing.
6. Prime the fuel pump (see page 25).
NOTE: For illustrative purpose only. Individual tank installations will vary.