Lanair MX300 - Manual (Page 38)

Section 13 - Service / Maintenance
34
Maintenance - Air Pre-Heater
1. Remove Pre-Heater Assembly
s Disconnect the air line from the
brass fitting on the air pre-heater
and then from
the air solenoid and remove.
s Disconnect wiring from the oil pre-
heater cartridge, air pre-heater
cartridge and snap disc assembly in
the wiring junction box.
s Disconnect fuel line and fitting (6)
from the oil block (5).
s Disconnect fuel pressure gauge (8)
and fitting from the oil block (5).
s Remove button hex screw (14) and
washer (11).
s Lift pre-heater assembly and care
fully pull straight back. Remove
entire assembly from the burner.
s Remove ignitor assembly (6).
2. Remove Diaphragm Assembly
from Air Pre-Heater
s Carefully place pre-heater assembly
in a vice. NOTE: Do not damage
pre-heater.
s Unscrew diaphragm assembly (19)
from air pre-heater and set aside.
Remove o-ring.
3. Remove Adapter Assembly
s Remove hex cap screws (17) and set adapter
assembly aside.
4. Remove Plunger , Spring and Cartridge Heater
s Remove spring (13) from plunger (15) and clean
both pieces.
s Remove 1/4" o-ring (10) and 11/16" o-ring (11).
s Loosen and remove cartridge heater and set aside.
5. Remove Nozzle Assembly and Quad Ring
s Remove nozzle assembly (3) using a 5/8" wrench.
s If quad ring (4) does not come out with nozzle, care
fully remove it.
Ref. Part
No. No. Qty. Description
1 9853 1 turbulator
2 - 1 set screw
3 9899 1 nozzle Heater
4 - 1 quad ring
5 9814 1 air pre-heater block
6 3728 1 ignitor assembly
7 - 1 hex cap screw
8 - 1 flat washer
9 - 1 connector
10 - 1 1/4" o-ring
11 - 1 11/16" o-ring
12 9549 1 air cartridge heater
13 - 1 spring
14 - 1 viton insert
15 - 1 plunger
16 - 1 adapter block assembly
17 - 1 hex head cap screw
18 - 1 1/2" o-ring
19 - 1 diaphragm assembly
20 - 1 hex head cap screw
21 - 1 oil pre-heater block
Remove wires from the block by
inserting a flat tip screwdriver into the
top slot. Push tip all the way down
and push forward. Remove wire.
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