Lanair DHI 300 User Manual
Page 34
Section 7 - Air Supply Installation
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19
General Requirements
1. Install an air pressure supply line connection to the air filter/regulator on the rear of the
heater.
2. The air supply source must be capable of producing 2.0 CFM @ 60 PSI.
3. Install a shut off valve in the air supply line for service.
4. Install a primary air filter/regulator with a gauge (capable of reading line pressure) in the
air supply line prior to the air filter/regulator mounted on the furnace. The primary air fil-
ter/regulator is not supplied with the furnace.
5. If the primary air regulator does not have a filter with a bowl, a condensate drain leg
must be installed in the air supply line.
6. Install a quick disconnect at the air filter/regulator on the furnace for service.
7. For the ease of installation install a flexible air line (.250 I.D. minimum) from the quick
disconnect to the primary air regulator.
8. The air supply line must be pitched uphill from the primary regulator to the furnace to
prevent condensation from entering your burner.
9. Open all air shut off valves, and set the primary air regulator at 30 PSI.
10. Set the air filter/regulator on the front of the furnace to 15 LBS. See illustration below
(Fig. 5) for a typical air pressure supply installation.
Figure 5
Section 13 - Service / Maintenance
QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST
34
Maintenance - Air Pre-Heater
1.
Remove Pre-Heater Assembly
• Disconnect the air line from the
brass fitting on the air pre-heater
and then from
the air solenoid and remove.
• Disconnect wiring from the oil pre-
heater cartridge, air pre-heater
cartridge and snap disc assembly in
the wiring junction box.
• Disconnect fuel line and fitting (6)
from the oil block (5).
• Disconnect fuel pressure gauge (8)
and fitting from the oil block (5).
• Remove button hex screw (14) and
washer (11).
• Lift pre-heater assembly and care
fully pull straight back. Remove
entire assembly from the burner.
• Remove ignitor assembly (6).
2. Remove Diaphragm Assembly
from Air Pre-Heater
• Carefully place pre-heater assembly
in a vice. NOTE: Do not damage
pre-heater.
• Unscrew diaphragm assembly (19)
from air pre-heater and set aside.
Remove o-ring and discard.
3. Remove Adapter Assembly
• Remove hex cap screws (17) and set adapter
assembly aside.
4. Remove Plunger , Spring and Cartridge Heater
• Remove spring (13) from plunger (15) and discard.
• Using a hook or screwdriver, carefully remove Viton
insert (14) and discard.
• Remove and discard 1/4" o-ring (10) and 11/16" o-
ring (11).
• Loosen and remove cartridge heater and set aside.
5. Remove Nozzle Assembly and Quad Ring
• Remove nozzle assembly (3) using a 9/16" wrench.
• If quad ring (4) does not come out with nozzle, care
fully remove it and discard.
Ref.
Part
No.
No.
Qty.
Description
1
9853
1
turbulator
2
7004
1
set screw
3
9757
1
nozzle Heater 260/300
4
9870
1
quad ring (K)
5
9814
1
air pre-heater block
6
3730
1
ignitor assembly
7
9870
2
hex cap screw *
8
7418
2
flat washer
9
3726
1
connector
10
9870
1
1/4" o-ring *
11
9870
1
11/16" o-ring *
12
9856
1
air cartridge heater
13
9870
1
spring *
14
9870
1
Viton insert *
15
9835
1
plunger
16
9838
1
Adapter block assembly
17
9870
2
hex head cap screw *
18
9871
1
1/2" o-ring (K)
19
9871
1
diaphragm assembly **
20
9871
2
hex head cap screw **
22
oil pre-heater block
* contained in tune up kit 9870
** contained in tune-up kit 9871
Remove wires from the block by
inserting a flat tip screwdriver into the
top slot. Push tip all the way down
and carefully push forward. Remove
wire.