Lanair DHI 300 User Manual

DHI-300
DUCTABLE

WASTE OIL HEATER

Installation andOperating
Instructions

Listed MH 14518 (N)

Lanair Waste Oil Heaters & Boilers

4109 Capital Circle

Janesville,Wisconsin 53546

608-752-1601

www.lanair.com

BEFORE YOU BEGIN INSTALLATION...

IMPORTANT

Read and understand this manual completely before beginning installation.

• This heater is for commercial and industrial use only. This unit is not intended for residential

use.

• This heater must be installed and/or inspected by a licensed heating contractor

before operation. Installer should be trained and thoroughly familiar with the
installation and operation of oil-fired heaters.

• Installation of this unit must be made in accordance with state and local codes or authori­ties having jurisdiction over environmental control, fuel, fire and electrical safety.

• N.F.P.A. (National Fire Protection Association Publications for Heater Installation)

NFPA No. 30 Flammable and Combustible Liquids Code
NFPA No. 31 Standard for the Installation of Oil Burning Equipment
NFPA No. 70 National Electric Code
NFPA No. 80 A&B Repair Garages and Parking Structures
NFPA No. 211 Standard for Chimneys, Fireplaces,Vents, and

Solid Fuel Burning Appliances
The above standards are available from the National Fire Protection Assn., Battery March
Park, Quincey, MA 02269

• Read and familiarize yourself with these instructions and associated photos, diagrams and
illustrations before beginning installation or operation.These instructions should be fol­lowed closely,to achieve the best possible results.

If you have questions or concerns at any time during the installation, stop the installation
and contact a Lanair Service Representative.

• Check to make sure you have all the required components needed for proper installation
and operation.

• Check each component for visible damage. If you find a damaged component, contact a
Lanair Service Representative for a replacement. Do

• This heater is designed to provide economically and environmentally friendly disposal of
waste oil. Due to the nature of the fuel used, this heater should not be relied upon as the
sole source of heat.

• Read and understand the warranty. Fill out the enclosed warranty card and return within
10 days of purchase.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

not install broken or damaged parts.

2

DHI-300 DUCTABLE WASTE OIL HEATER

Installation and OperatingInstructions

TableofContents:

RulesForSafe Installation and Operation ................................... page 2

Sec. 1 General Specificationsand Hazards .......................................... page 4

Sec. 2 Heater Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 10

Sec. 3 Chimney/Vent System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 12

Sec. 4 Draft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ........................................ page 15

Sec. 5 Fuel SupplyTank /Piping Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .............page 15

Sec. 6 Fuel SupplyPump/Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .................page 17

Sec. 7 CompressedAirInstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 19

Sec. 8 Electrical Connections/WiringDiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...page 20

Sec. 9 Controls . . . . . . . . . . . . . . . . . . ....................................................... page 23

Sec.10 PrimingFuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 25

Sec.11 Burner Start-UpProcedure . . . . . . . . . . . . . . . . . ...................................page 27

Sec.12 FlameAdjustment ........................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 29

Sec.13 Maintenance Schedule/Service Adjustments . . . . . . . . . . . . . .................page 32

Sec.14 Troubleshooting. . . . . . . . . ....................................................... page 44

Sec.15 Warranty Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 50

Sec.16 Burner ReferenceDiagram .................. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 51

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3

Section 1 - General Specifications & Hazards

7

2

1

3

4

5

6

8

9

11

DHI Series Burner
NOTE:This burner intended for use with DHI 300 Lanair Waste Oil-Fired
Heater Only

No. Description

1 Mounting Plate
2 Ignitor Transformer
3 Fuel Line Inlet
4 Fuel Pressure Gauge
5 Combustion Air Baffle
6 View Port
7 Oil Primary Safety Control
8 Waste Oil/Fuel Oil Switch

9 Quick Disconnect Receptacle
10 Air Supply Inlet
11 Combustion Blower Motor

Burner Assembly­Performance Ratings

Voltage . . . . . . . . . . . . . . . . . . . . . . 115 vac

Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . 60 hz

Total Operating Amperage . . . . . . . . 5.8

Weight . . . . . . . . . . . . . . . . . . . . . . . . .31 lbs

Oil Primary . . . . . . . . . . . . . . . . . . 0.2 amps

Pre-Heater Block . . . . . . . . . . . . .2.6 amps

Ignitor Transformer . . . . . . . . . . 0.3 amps

10

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

4

Section 1 - General Specifications & Hazards

9

2

2

2

1

3

6

4

5

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

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8

7

5

Section 1 - General Specifications & Hazards

DHI-300 FRONT

DIMENSIONS:

DHI-300 Height: 61” Width: 43” Depth: 47”
Weight: 370 LBS

FIRING CAPACITIES:

DHI-300 Nozzle @ 1.86 gallons/hour,No.2 fuel oil

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

6

8" exhaust

View port

Section 1 - General Specifications & Hazards

lower Moter

B

Assembly

ower Box

P

lectrical Access

E
Panel

Fan Hi-Limit
switch

Clean Out

Access Panel

LEFT SIDE

REAR

FRONT

Burner
Assembly

RIGHT SIDE

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7

7

6

OPTIONAL J-PUMP

5

8

4

7

Section 1 - General Specifications & Hazards

2

8

3

9

6

No. Description

1 Pump Platform
2 Pump Motor
3 Pump Guard
4 Pump
5 Pressure Gauge port
6 Easy Flow Bleed Valve
7 1/4" NPT Inlet (1/2" J Pump)
8 1/8" NPT Outlet (1/4" J Pump)
9 Pump coupler

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

Pump Assembly­Performance Ratings

Voltage . . . . . . . . . . . . . . . . . . . . . . 115 vac

Cycles . . . . . . . . . . . . . . . . . . . . . . . . . . 60 hz

Weight . . . . . . . . . . . . . . . . . . . . . . . . . 24 lbs

Pump Motor . . . . . . . . . . . . . . . . . . 5 amps

1

8

Section 1 - General Specifications & Hazards

DIMENSIONS:

Height: 61” Width: 43” Depth: 47”
Weight: 370 LBS

FIRING CAPACITIES:

DHI-300 Nozzle @ 1.86 gallons/hour,No.2 fuel oil

MINIMUM CLEARANCE TO COMBUSTIBLES:

Top . . . . . . . . . . . . . . . . . . . . . . . . 6” Chimney Connector . . . . .18”

Sides . . . . . . . . . . . . . . . . . . . . . .18” Rear . . . . . . . . . . . . . . . . . . . . . 6”

Front . . . . . . . . . . . . . . . . . . . . . .24” Bottom . . . . . . . . . . . . . . . . .18”

THIS HEATER IS DESIGNED TO BURN THE FOLLOWING APPROVED FUELS:

Used 5W through 50W Crankcase Oils
Used Automatic Transmission Fluid
No. 1 and No. 2 Fuel Oils

• The Lanair Heater provides the owner with a dependable, versatile and simple means of
burning No. 1 and No. 2 fuel oils, 5W through 50W used crankcase oils, and used auto­matic transmission fluids. Maintained correctly, the heater will give you years of service.
Please carefully read this owner’s manual. If in any case you have a problem with your
heater,or its installation, you should contact the Lanair Customer Service Department at
1-800-753-1601.

• Do not attempt to start the burner when excess oil, oil vapor, or fumes have accumulat­ed! Never press the red button on the oil primary control more than twice! This could
cause excess vapor, or fuel to ignite causing damage to the heater and/or chimney.

• Do not store or use gasoline, or any other flammable liquid and/or vapors near this
heater.

• This heater is not designed for use in hazardous atmospheres such as: Paint Shops, Feed
Mills, installations where explosive or flammable conditions are present or could occur.

WARNING! Lanair heaters rely on natural draft. Down drafts (positive pressures)

in the heaters chimney will occur in buildings where negative pressures are created
by exhaust fans, (car exhaust, paint booths, etc). Do not try to use a power vent to

!

overcome a down draft (positive pressure). An adequate make-up air system is
required when exhaust fans are used (consult your heating contractor).

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9

Section 2 - Heater Installation

TYPICAL INSTALLATION:

HEATER/CHIMNEY PACKAGE

Through the wall installation

Figure 1

1. Chimney Cap

2. Chimney Pipe

3. Clean-out Tee

4. Wall Thimble

5. Barometric Damper

6. Black Pipe

7. Burner

8. Blower Assembly

9. Secondary Air Regulator

10. Primary Air Regulator

11. Duct Connectors

12. Fuel Line

13. By-pass Regulator

14. Oil Strainer

15. Pump Assembly

16. Oil Storage Tank

17. Thermostat

18. Power Supply

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

10

Section 2 - Heater Installation

General Requirements

1. Do not install the heater on a combustible surface of any kind. For minimum clearance to

combustible material (see Page 9)

2. Install the heater in a location to utilize total heat throw.

3. Install the heater in a location to permit a correct outdoor chimney exit to eliminate

down drafts, and provide easy chimney installation and maintenance. Class A chimney
MUST be used when passing through any wall or ceiling. See Section 3 Chimney
Installation

4. Install the heater in a location to permit the fuel supply to be as close as possible.

5. Do not install the heater more than 10 feet above the top of the fuel supply tank.

6. Before suspending the heater check the supporting structure and reinforce if necessary

to support the weight of the heater/system.

7. Use 3/8” steel threaded rod to suspend the heater from a capable load carrying ceiling

structure when not using the Lanair Waste Oil Storage Tank.

8. The heater must be suspended level for proper operation. A heater that is not level could

cause a hazardous situation in which personal injury or property damage may result.

CAUTION: DUCT WORK RUNS MUST BE DESIGNED AND INSTALLED BY A
LISCENSED HEATING CONTRACTOR

!

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11

Section 3 - Chimney/Vent System

Figure 2 - Typical Chimney Installation

NOTE: Class "A" compo­nents require a 2" clear­ance from combustible
materials. All other
chimney components
require a minimum 18"
clearance from com­bustible materials

General Requirements

1. Safe operation of any gravity vented heating appliance requires a proper air make-up

system to prevent the heater exhaust gases from being drawn into the building.These
gases could cause death, serious injury, and/or property damage.Exhaust fans, paint
booths may cause draft problems.

2. Never vent this heater into another heating appliances chimney. Never vent into ‘Class B”

chimney.Gas heaters use “Class B” chimney, it is rated for a much lower temperature than
is required for your waste oil furnace.This heater must have its own separate “Class A”
chimney.

3. Inspect and maintain the chimney on an annual basis.

FAILURE TO PROVIDE PROPER VENTING OF THE HEATER EXHAUST
GASES COULD RESULT IN DEATH, SERIOUS INJURY, AND/OR PROPERTY

!

DAMAGE. FOLLOW CHIMNEY MANUFACTURERS INSTRUCTIONS.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

12

Section 3 - Chimney/Vent System

DO NOT INSTALL CHIMNEY IN FRONT OF
THE HEATER (in air stream of fan)

!

Barometric Damper Position

ORIZONTAL

H

General Requirements (cont.)

4. Install a U.L. listed barometric damper in the chim-

ney. Do not reduce or enlarge the vent pipe.

5. Each 90° elbow equals a 10’ run of chimney.The

maximum run for the chimney connector is 30’ (See
illustrations on pp. 12 & 14).

6. To prevent the drawing of exhaust gases into the

building, keep the barometric draft control at least
24” from the heater,exhaust fan etc..

7. Position the draft control as shown. Barometric

Damper gate pins must be horizontal (Level or
parallel to the floor) for proper operation.

8. Secure all connections in the chimney connector with 3 screws per joint.

9. The chimney connector clearance to any combustible material is 18”. The “Class A”

chimney clearance to any combustible is 2”. Follow the chimney manufacturer’s instruc­tions.

10. Do not install heat re-claimers, manual draft controls, or any other type of restrictive

control in the chimney.

11. Install clean out tee with a cap, at the transition of the chimney. FOLLOW CHIMNEY

MANUFACTURERS INSTRUCTIONS.

NOTE: Barometric Damper may

be mounted horizontally or
vertically. Angle gate pins
must be horizontal (level or
parallel to floor) for proper
operation.

VERTICAL

12. Use “Class A” insulated chimney pipe to vent exhaust gases through wall, ceilings, attics,

roofs, combustibles, etc. Class A chimney must be used for the entire run once passing
through a wall of ceiling.

13. Vent chimney at least 3 feet above the roof and at least 3 feet higher than any portion

of the building, roof, or obstruction within 10 feet of the chimney.

14. The chimney cap should be at least 3’ above the chimney exit through the roof.

15. Do not use a rotating chimney cap. Use a non-restrictive “Class A”cap made for the type

“Class A”chimney you are using. Follow chimney manufacturer’s instruction.

16. The chimney must be capable of producing a negative -.02 W.C. draft when cold and -

.06 W.C. draft when hot. Refer to Section 5 Draft Instructions.Refer to Section 3.10 for
typical Chimney Installation.

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13

Section 3 - Chimney/Vent System

17. If you are unable to attain the proper draft,check for exhaust fans in the building.To test

if there is a problem, open an overhead door and see if you now have the proper draft.
You may have to add one or more sections of “Class A” chimney to the roof to get the
proper draft.

18. The heater and chimney must be installed in accordance with all state and local
codes.The heater must be installed in accordance with the specifications listed in
this manual.The chimney must be installed per the chimney manufacturer’s
instruction. Use “Class A”chimney only.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

14

Section 4 - Draft

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 contrac­tor, or a manometer can be purchased from the Lanair Customer Service Department .

Section 5 - Fuel Supply Tank Installation

Figure 3

NOTE: For illustrative purpose only.Individual tank installations will vary.

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15

Section 5 - Fuel Supply Tank Installation

If using a Lanair supply tank follow instructions included with the tank.

!

General Requirements

1. The fuel supply tank and supply lines must be installed in accordance with the National

Fire Protection Association requirements, as well as State and Local ordinances.

2. Regulations require oil storage tanks located inside not too exceed 275 gallons individu-

ally, and are not to exceed a total capacity of 550 gallons in one building. Check State
and Local codes.

3. Locate the fuel supply tank inside the building as close to the heater as possible. It

should be no further than 25 feet from the heater to avoid oil flow problems.

4. The fuel supply tank must be mounted below the level of the burner and the by-pass

regulator.Mounting the fuel supply tank above the burner will create head pressure and
over-fire the burner voiding the warranty.

5. Pitch the fuel supply 2º with the drain valve at the lowest end to drain off water and

sludge. Sludge may have to manually be removed.

6. Some ordinances may require the fuel supply tank to be vented to outside, and above

the roofline. Check State and Local codes. Keep the vent clear.

7. Install the fuel tank fill pipe at the end of the tank and above the drain.

8. Label the fuel tank for the recommended fuels.

9. Strain all fuel with a 50 X 50 mesh strainer before putting fuel into the tank.

10. When filling the fuel tank with a motorized pump, never leave unattended to prevent

over filling and/or spillage.

11. Keep cap on the fuel tank when not filling.

For optimum performance, the waste oil pump manufacturer recom­mends that multi-weight oils such as 5W-30W be maintained at 32˚ F

!

minimum and straight weight oils such as 40W and 50W be maintained
at 50˚ F minimum.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

16

Section 6 - Fuel Supply Pump/Piping

General Requirements

1. Mount the fuel supply pump in a horizontal position (shaft horizontal) near the fuel sup-

ply tank.

2. The oil pump has a maximum suction lift of 14 feet. Suction lift is the length of pipe run

from the bottom of the pick up strainer to the fuel supply pump.

3. The fuel pump/motor are intended for indoor use only.

4. The fuel pump contains an internal strainer that periodically needs to be cleaned.This

internal strainer is mounted behind the pump cover.Before removing the pump cover
make sure you have a new gasket on hand. Contact the Lenan Customer Service
Department for the proper gasket for your model of pump, at 800-753-1601.

5. Install the suction supply line from the inlet side of the fuel pump into the fuel tank

opposite the drain.

6. Install a 1/2” inside diameter (.493) steel pipe, or 1/2” outside diameter copper through-

out the suction supply line and pick up tube. The use of smaller line, or rubber,plastic or
hydraulic line is unsafe and will void your warranty.

7. Use thread sealing compound on all pipe thread connections.Do Not Use Teflon Tape.

8. Install the suction line strainer in the suction line. Make sure the suction line strainer is 6”

off the bottom of the tank. The suction line strainer may be mounted horizontally or ver­tically. Consider accessibility.

9. Install a 1/2” NPT pipe union between the suction line strainer and the pick up tube to

allow for service on the pick up tube.

10. Install the check valve (arrow facing towards the pump) on the bottom of the pick up

tube.

11. Install a vacuum gauge in the suction line.This gauge will indicate when service is need-

ed on the strainer,pump or connections.

12. Install a 1/2” inside diameter (.493) steel pipe, or 1/2” outside diameter copper from the

fuel by-pass regulator (port marked “O”) to the fuel supply pump. Do not allow this line
to protrude into the tank more that 1”The use of smaller line, or rubber,plastic or
hydraulic line is unsafe and will void your warranty.

13. Do not allow the fuel level in the tank to cover the return line.

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17

Section 6 - Fuel Supply Pump/Piping

14. Install the fuel supply line from the fuel by-pass regulator (port B) to the inlet port on the
left side of the burner using 1/2” inside diameter (.493) steel pipe, or 1/2” outside diame­ter copper tubing.The maximum distance of this line is 25 feet.The fuel supply line must
be run below the burner at all times. If the fuel supply line runs above the burner it will
create head pressure.This head pressure will over-fire the burner voiding the warranty.

15. Install a union in the supply line close to the burner for service.

16. Install a shut-off valve in the fuel supply line at the fuel by-pass regulator for service.

17. Use 37º flare fittings on all copper tubing connections. Do not use compression fit­tings.

18. Keep the fuel supply lines 1” off any outside walls.

19. The fuel supply line must gradually rise to the burner.It should not be higher than the

burner.

20. Clean all lines, fittings, and parts internally before assembly. A small burr or piece of
rust could plug the nozzle. See Section 2 for an illustration of a typical pump and piping
installation.

B. Port to the oil inlet on the burner assembly.

Install 1/2” O.D.min. copper tubing, or 1/2”
schedule 40 pipe. Failure to install this line

properly will result in damage to your
heater, and will void your warranty.

T. Port to the oil supply tank for the overflow

return line. Install 1/2” O.D.min. copper tubing.
or 1/2” schedule 40 pipe. This line MUST
straight into the tank, and should not be sub­merged in oil. No elbows should be used.

Failure to install this line properly will result
in damage to your heater, and will void your
warranty.

P. Port from the outlet side of your fuel supply

pump. Install 1/2” O.D. min. copper tubing, or
1/2 schedule 40 pipe. Failure to install this

line properly will result in damage to your
heater, and will void your warranty.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

run

Bottom View of the Aluminum Oil

By-Pass Regulator

Figure 4

18

Section 7 - Air Supply Installation

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 fil­ter/regulator is not supplied

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.

with the furnace.

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

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19

Section 8 - Electrical Connections

CAUTION: HAZARD OF ELECTRICAL SHOCK!

!

Main Electrical Installation

1. All wiring must comply with the National Electrical Code. State and Local Ordinances,

and be wired by a qualified electrician.

2. Electrical service MUST be connected to two separate 20 AMP, 115 VAC, 60 HZ single

phase circuit.

3. Electrical service connections are made in the electrical junction box on the side of the

heater.

4. The heater must have a safety equipment ground from the main electrical service,

stranded 12 GA minimum.

5. The electrical conductors for electrical service to the heater MUST be stranded 12 GA

minimum.

6. Install a manual service disconnect near the heater, and label its function.

7. The supply voltage must be maintained at a minimum 110 VAC.

8. The electrical conductors from the main electri-

cal service must be within approved conduit.

9. Keep all electrical conductors and conduit away

from the chimney connector as well as any
other hot surfaces. Refer to Figure 7, Wiring
Diagram for color code, etc. Keep the power off
until the heater is ready to be started. Refer to
Section 12 Start Up Procedure.

Remove wires from the block by insert­ing a small flat tip screwdriver into the
top slot. Push tip all the way down and
carefully push forward. Remove wire.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

Figure 6

20

Figure 7

Section 8 - Electrical Connections

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21

Section 8 - Electrical Connections

CAUTION: HAZARD OF ELECTRICAL SHOCK!

!

Fuel Supply Pump Electrical Installation

1. All wiring must comply with the National Electrical Code, State and Local Ordinances,

and be wired by a qualified electrician.

2. The electrical conductors to the fuel pump motor MUST be stranded 14 GA minimum.

3. The electrical service connections for the fuel pump motor are made in the electrical

junction box on the side of the heater.

4. The pump motor MUST have a safety equipment ground from the main electrical serv-

ice, stranded 12 GA minimum.

5. The electrical conductors from the electrical junction box to the pump motor must be

within approved conduit.

6. Keep all electrical conductors and conduit away from the chimney connector as well as

any other hot surfaces. Refer to Figure 15 Wiring Diagram for color code, etc. Keep the
power off until the heater is ready to be started. Refer to Section 13 Start Up Procedure.

Room Thermostat Installation

1. All wiring must comply with the National Electrical Code, State and Local Ordinances,

and be wired by a qualified electrician.

2. Install the room thermostat in accordance with the directions furnished with the ther-

mostat.

3. Use two conductor thermostat wire for the connection of the thermostat to the T.T. ter-

minals of the oil primary control that is mounted on top of the burners electrical box.

4. Mount the thermostat 5 feet above the floor on an inside wall away from the heater’s
warm air path.

5. The electrical current for thermostat is 24 V,and is provided by the oil primary control.

6. Keep the thermostat wire away from the chimney connector, or any other hot surfaces.

Refer to Section 2 for a typical thermostat installation.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

22

Section 9 - Controls

• Room Thermostat:

The room thermostat automatically controls the on/off operation of the heater according
to the setting of the desired room temperature.The thermostat works in conjunction with
the oil primary safety control.

• Oil Primary Safety Control/Cad Cell:

The oil primary control is mounted on top of the burner’s electrical box. When the thermo­stat calls for heat the oil primary control starts the burner by switching on the air solenoid
valve, ignition transformer,combustion air blower, and the fuel pump. The oil primary con­trol works in conjunction with the cadmium sulfide cell (cad cell). The cad cell is mounted
inside the burner cover,and faces the flame.The cad cell monitors the light level inside the
combustion chamber to insure there is a flame present. If there is a loss of flame the pri­mary control will go into its recycle mode. After 1-2 minutes the primary control will restart
the burner.When this happens if there is a flame present, the burner will continue to func­tion. If on start up no flame is established in 30 seconds the primary control will lock out.

CAUTION: Do not press the reset button more than twice. If the burner fails to start refer to
Section 14 - Trouble Shooting. Burner has a two (2) minute automatic re-start feature.

• Fan/Limit Control

The fan/limit control performs 3 functions. The fan/limit control monitors the temperature
of the air inside the cabinet. When the air reaches a set point (usually 120º F) it will switch
on the heater fan. When the temperature in the cabinet drops below 90º F the fan/limit
control will turn the fan off.The Fan/Limit Control contains an external slide switch to turn
the axial fan on manual by-passing its automatic function.

The Fan/Limit Control monitors the temperature of the air inside the cabinet. When the
temperature exceeds a fixed set point it switches the burner (Oil Primary Control) off until
the temperature drops to a safe level.The burner will then restart.

“CAUTION”This means the heater has reached its “High Limit”, the cause must be deter­mined and corrected before further use (over firing the unit is normally what causes this
condition).The Fan/Limit Control is located on the top on the front of the cabinet.

• Barometric Draft Control

The Barometric Draft Control automatically maintains a pre-set chimney draft, and is locat­ed in the chimney connector.

• Air Filter/Regulator

The Air Filter/Regulator performs two functions: It removes condensation and dirt from the
air.and it controls the amount of air pressure reaching the nozzle and air operated fuel
valve.The Air/Filter Regulator is mounted on the cabinet near the burner.

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23

Section 9 - Controls

• Electric Air Solenoid Valve

The Electric Air Solenoid Valve is controlled by the Oil Primary Control. It acts as a shut-off
valve, (it’s open during operation, and closed when the burner is off ). The Electric Air
Solenoid Valve is located inside of the burner’s electrical box. (See Page 51).

• Air Operated Fuel Valve

The Air Operated Fuel Valve controls fuel flow out the nozzle.When the Electric Air
Solenoid Valve opens and air pressure pushes on the fuel valve diaphragm, the plunger
moves off the nozzle seat allowing fuel to enter the nozzle. The Air Operated Fuel Valve is
located on the back of the air pre-heater.(See Page 51).

• Air/Oil pre-heater

The Air/Oil pre-heater is an assembly that preheats the atomizing air and fuel to a prede­termined temperature to properly combust used oil.The Air/Oil pre-heater is located in the
burner (See Page 51).

• Snap Disc

The Snap Disc accurately controls the temperature of the air/oil pre-heater assembly with
two resistance type cartridge-heating elements. The Snap Disc is mounted on the oil pre­heater inside the burner.(See Page 51).

• Nozzle

The Nozzle uses air pressure to help pull fuel through its small orifice, and to atomize the
fuel for proper combustion.The Nozzle is located on the end of the air pre-heater opposite
the fuel valve. Replace the Nozzle annually,as they are prone to wear by contaminants in
waste oil (See Page 46).

• Fuel By-Pass Regulator

The Fuel By-Pass regulator controls the pressure of the fuel to the nozzle. The Fuel By-Pass
regulator is located in the line between the outlet side of the pump and the burner.

• Fuel Supply Pump

The Fuel Supply Pump pumps fuel from your oil storage tank to the burner.The Fuel Supply
Pump should be located as close to the fuel supply tank as possible. The Fuel Supply Pump
must be mounted horizontally (Shaft).

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

24

Section 10 - Priming The Fuel Pump

Priming The Fuel Pump

1. The fuel level in the supply tank must be

above the check valve on the pick-up tube.

2. Remove the bowl of the suction line strainer,

and fill with clean fuel. Replace the strainer
bowl.

3. Remove the two yellow wires from the F-F

terminal on the oil primary control. Install a
jumper wire between the F-F terminals (see
Figs. 8 & 9).

4. Adjust the air filter/regulator on the heater

to 15 PSI.

5. Remove the fuel supply line from the burner,

and position a container to catch the fuel.

6. Back the thumb screw out (CCW) on the by-

pass regulator until it is free, the turn (CW)
two turns to seat the diaphragm.

7. Loosen the bleeder screw on the pump one

turn, and attach a piece of 3/16” ID clear
plastic tubing.The tubing should be long
enough to allow the fuel to be returned to
the tank.

Figure 8

Remove two yellow wires

Figure 9

Install jumper wire

8. Turn the room thermostat above room temperature, or to the “ON” position.

9. Momentarily disconnect one end of the jumper wire at the F-F terminals on the oil pri-

mary. The fuel pump will now start.

10. Observe the clear tubing attached to the bleeder screw on the pump.When a steady

stream of fuel (no air bubbles) flows close the bleeder screw. Remove the tubing from
the bleeder screw.

11. Observe the end of the fuel supply line that is disconnected from the burner. Allow a

steady stream (no air bubbles) of fuel to flow into the container for several minutes.This
will flush any debris from the fuel line that could potentially plug the nozzle. The vacu­um gauge reading should not exceed 5” HG of vacuum.

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25

Section 10 - Priming The Fuel Pump

12. Turn the room thermostat below room temperature or “OFF”. The fuel supply pump will

now stop.

13. Reconnect the fuel supply line to the burner.

14. Remove the jumper wire from the F-F terminals on the oil primary control, reattach the

yellow cad cell wires.

15. Adjust the burner air filter/regulator to 15 PSI.

16. If the fuel supply pump prime, or fuel stream has air in it (spurting,fluctuating flow) there

is likely a leak in the suction side of the plumbing. Refer to section 14,Trouble-shooting.
The burner should now be ready to fire.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

26

Section 11 - Burner Start-Up Procedure

Waste Oil Burner Start-Up

1. Make sure the main electrical service for the heater is turned off, and locked out.

2. Fill the oil supply tank with an approved fuel to a level that is above the pick-up tube

check valve.

3. Check for proper draft in the chimney. The draft must read -.02 W.C.cold.

4. Make sure there is air pressure at the heaters air filter/regulator, set at 15 PSI. Set the pri-

mary regulator on the air supply line to 30 PSI.

5. Set the fan/limit control slide switch to automatic.

6. Check the combustion air adjustment baffle for proper setting. Refer to Section 15 Flame

adjustment.

7. Set the room thermostat below room temperature (OFF).

8. Push the reset button on the oil primary control for 3 seconds.

9. Turn the main electrical service ON.

10. Flip the lighted rocker switch for preheating on the burner electrical box to the ON posi-

tion (pre-heater OFF the light is off, pre-heater ON the light is on.).

11. Prime the fuel supply pump. Refer to Section 10, Priming the Fuel Supply Pump.

12. If using waste 5W-50W oil or automatic transmission fluid for fuel, flip the pre-heater

rocker switch on (light ON, and wait 5-7 minutes for the pre-heater assembly to reach
operating temperature. Leave the pre-heater switch OFF if using No. 1 or No. 2 fuel oil.).

13. Turn the room thermostat up above the room temperature. The burner will now fire,

check the sight glass on the rear of the burner also inspect the flame through the flame
view port on the heater. (See page 29-31, flame adjustment).

14. Adjust the burner air filter/regulator to 15 PSI, and the primary air regulator to 30 PSI.

NOTE: 15 PSI on the air filter/regulator is the starting point, you may need to adjust from
there when VISUALLY SETTING THE FLAME (See page 29-31, flame adjustment).

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27

Section 11 - Burner Start-Up Procedure

15. Adjust the fuel pressure gauge on the left side of the burner to read.

No. 1 & No. 2 Fuel Oil Approved Waste Oil

Model DHI-300

NOTE: Adjust the thumb screw on the fuel bypass regulator clockwise to increase pressure,
and counter clockwise to decrease pressure to the burner.The oil pressures listed above are a
starting point, you may need to adjust from there when VISUALLY SETTING THE FLAME
(See page 29-31, flame adjustment).

16. Adjust the barometric damper to obtain a draft of -.06 W.C.while the heater is hot and

operating.

NOTE: It is VERY IMPORTANT that the barometric damper is set to the required settings to
ensure the natural draft of exhaust gases (see sections 4 & 5).

17. Depending on the type of fuel used, the elevation, temperature, and oil viscosity, the

combustion air baffle will need to be adjusted for optimum performance (See page 29­31, flame adjustment).

4.5 (4-1/2) LBS. 5-6 LBS.

18. When the room thermostat setting is met

the burner will shut off, but the fan will con­tinue to operate until the cabinet tempera­ture drops to 90º F.

Clockwise:

Increase fuel
pressure

Lock Nut

Fuel By-Pass Regulator

Counter
Clockwise:

Decrease fuel
pressure

Thumb Screw

The combustion air baffle is NOT factory set

!

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

28

Section 12 - Flame Adjustment

Flame Adjustment

1. Start the heater, let it run for at least 15 minutes to reach operating temperature before

proceeding.

2. Check the chimney draft, set the barometric damper to -.06 WC when hot and running.

3. Check the atomizing air pressure, set the air filter/regulator on the heater to 15 PSI as a

starting point.

4. Check the fuel pressure gauge on the burner, set to:

Model DHI-300

No. 1 and No. 2 Fuel Oil 4.5 (4-1/2) LBS.

Used Crankcase Oil 10W-50W 5-6 LBS.

Used Automatic Transmission Fluid 5-6 LBS.

5. Adjust the thumb screw on the fuel by-pass regulator. Lock into position. The flame

should extend no more than 3/4 of the way into the chamber.

NOTE: The above pressure is a staring point, depending on your installation you may
need further adjustment. Always VISUALLY SET THE FLAME. See page 30.

6. Loosen the combustion air adjustment

baffle, slowly close the baffle in 1/16”
increments until the heater (flame) starts
to rumble.Then slowly open the baffle in
1/16” increments until the rumbling stops,
(wait 2 minutes between adjustments)
finally open the baffle an additional 1/8”
to provide excess oxygen. Secure the baf­fle, (See Fig.10).

NOTE: Mechanical equipment like gauges
and regulators are not always 100 percent
accurate, VISUAL INSPECTION OF THE
FLAME IS REQUIRED in order to properly
dial in the flame settings, see page 30.

The combustion air baffle is NOT
factory set

!

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Figure 10

combustion
air baffle

29

Section 12 - Flame Adjustment

NOTE: ALWAYS WEAR EYE, FACE AND BREATHING PROTECTION AND
PROTECTIVE CLOTHING WHEN INSPECTING OR ADJUSTING FLAME.

!

Lift the inspection port cover on the front of the combustion chamber to observe the flame.
The flame tips should extend 3/4 of the way into the combustion chamber.When the unit is
adjusted properly the ash inside the chamber will be white to off white.

Flame tips touching the target brick (end of the chamber) will cause combustion chamber
damage.This condition may be caused by a worn nozzle, or excess burner fuel pressure.
When this condition exists, the ash in the chamber will
be brown to black.

Flame Adjustment - Visual

Flame is over-fired (Fig. 11).

• Dark yellow, to orange in color.

• The flame is hitting the walls, filling the chamber
with a smokey flame. Correct immediately or
chamber may be damaged.

• Decrease fuel pressure, and adjust combustion

air baffle. Air pressure may also need to be
adjusted.

Problem: Too large of a flame, dark yellow in color.

1. Too much fuel pressure.

2. Not enough combustion air.

3. Not enough atomizing air pressure.

4. Ash inside the chamber is dark brown to sooty

black in color.

Flame is under-fired (Fig. 12).

• The flame is like a blow torch.

• Light yellow, to white in color.

• Flame is too short.

• Check to see if pre-heater block is hot.

• Check air PSI, it may be too high. Adjust in 1 LB.

increments.

• Oil pressure and the combustion air baffle may

need adjustment.

BAD FLAME

The flame is too big, creating an over­fire condition

BAD FLAME

The flame is too short

GOOD FLAME

The flame length is approximately 3/4
of the chamber

Figure 11

Figure 12

Figure 13

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

30

Section 12 - Flame Adjustment

Problem: Too small a flame, similar to a blowtorch.

1. Too much atomizing air pressure.

2. Too much combustion air pressure.

3. Not enough fuel pressure.

Solutions:

1. Correct fuel pressure setting.

2. Flame tips reach 3/4 of the way into the chamber.

3. Flame has slightly yellow/orange tips.

4. No black smoke coming from the chimney.

5. Ash inside the chamber is white to off white in color.

Flame is full (Fig. 13).

• Bright yellow in color.

• Flame extends 3/4 into the chamber.

• Flame is not impinging on the chamber walls.

If you need assistance with flame adjustment, please call Lanair's Parts and Service
Department.

DO NOT OVER FIRE YOUR HEATER. IMMEDIATELY ADJUST
THE BURNER TO THE PROPER FLAME LENGTH TO PREVENT

!

DAMAGE TO YOUR HEATER.

CHECK FLAME DAILY (see page 30). ADJUST ACCORDINGLY

!

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31

Section 13 - Service / Maintenance

DHI SERIES HEATER SERVICE / MAINTENANCE SCHEDULE

DAILY

WEEKLY

MONTHLY

ANNUALLY

(Season Shut Down)

• 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 fil­ter/ regulator. Set to
15 psi. Drain water
from the bowl if nec­essary

• Check the fuel pres­sure gauge on the

rner.Set to the

bu
correct pressure for
the fuel being used.

• Visually inspect
flame. Adjust accord­ingly. NOTE: Wear

adequate eye, face
and breathing pro­tection.

• Check draft using a

• If heater is not to be

ter.Set draft

manome
to -.02 cold, -.06 hot.

used for more than
12 hours (overnight),
flip the pre-heater
rocker switch off
(light off).

• Drain water/ anti­freeze from the fuel
suppl

y tank.

• Check the air pres­sure setting on the
primary air regulator.
Set to 30 psi.

• Drain water from the
air pressure supply
line drain leg and pri­mary regulator.

• Inspect the combus­tion, ash build-up
and flame.

NOTE: Wear ade­quate eye, face and
breathing protec­tion.

• Check combustion
chamber and heat
exchanger.Clean if
necessary. Inspect
fire brick.

NOTE: Wear protec­tive clothing, ade­quate eye, face and
breathing protec­tion. Do not
breathe dust from
the combustion
chamber.Wash
thoroughly with
soap and water
after cleaning
chamber.

• Clean the chimney,
chimney connector
and barometric
dam

per.

• Clean pump strainer,
suction line strainer
and pick-up tube
strainer (pp 33).
NOTE: Always prime
pump after cleaning
strainers.

• Check for dirt build­up on the combus­tion blower wheel.
Keep wheel clean.

• Shut off main power
supply to heater.

• Perform monthly
service/maintenance.

• Flip air/fuel pre­heater switch off.

• Shut off air supply.

• Remove air/fuel pre­heater assembly.
Disassemble and
clean. Replace all o­rings (pp.34, 35).

• Remove air turbula­tor 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 specifica­tions on the motor
rating plate.

• Clean fuel pump
strainer (see pp 33).

• Drain and clean fuel
supply tank.

• Clean combustion

ower,axial fan

bl
blades and fan cage

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

32

Air Pre-Heater Tune -Up
Kits (PN# 9870 & 9871) Required.

Section 13 - Service / Maintenance

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33

Maintenance - Air Pre-Heater

Section 13 - Service / Maintenance

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 pre­heater 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.

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

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" o­ring (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.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

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.

34

Section 13 - Service / Maintenance

Maintenance - Air Pre-Heater (cont.)

6. Clean all parts using a parts washer

• All passages must be thoroughly cleaned with a brush.

7. Replace Nozzle Assembly and Quad Ring

• After cleaning air pre-heater assembly,blow dry.

• Install new quad ring (4). Before inserting quad ring in air pre-heater block, a light coat

of oil should be applied. NOTE: Make sure quad ringis properly seated in block before

proceeding (see page 40 for clarification).

• Apply a light coat of oil to the shaft of the new nozzle assembly (3). Carefully insert new
nozzle assembly (3) through the quad ring and into the block and tighten securely.

• Check alignment of ignitors and adjust if necessary (see page 39).

8. Replace O-rings and Plunger

• Insert a new 1/4" o-ring (10) and a new 11/16" o-ring (11) into the air pre-heater
block (5).

• Insert new Viton insert (14) into the end of the plunger (15) and place new spring (13)
on the end of the plunger. Insert plunger into air pre-heater block spring end first.

9. Replace Cartridge Heater

• Apply pipe dope to cartridge heater threads. Insert cartridge heater into air pre-heater
block and tighten.

10. Replace Adapter Assembly

• Align the holes of the adapter assembly (16) with those on the air pre-heater block (5).
NOTE: Make sure the small end of the adapter pin is facing toward the air pre-heater
block.

• Attach the Adapter assembly (16) to the block using two hex cap screws (17). Tighten
screws.

11. Replace Diaphragm

• Replace diaphragm, o-ring and spring (see page 40) Hand tighten diaphragm assembly
to air pre-heater block. NOTE: Do not over tighten.

12. Replace Ignitor Assembly (see page 40)

13. Service Oil Pre-Heater (see pages 36-37 for Annual Maintenance Instructions)

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35

Oil Pre-Heater Tune -Up
Kit (PN# 9869) Required.

Section 13 - Service / Maintenance

Maintenance - OIl Pre-Heater

1. Separate Air Pre-Heater from Oil
Pre-Heater

• Remove o-ring and discard(10).

2. Disassemble Oil Pre-Heater

• Remove o-ring and discard(10).

• Remove six hex cap screws (3)

from face plate (2) and discard.

• Remove oil cartridge heater (1).

• Remove four 13/16"OD o-rings

and discard(4).

• Remove three plugs (12) from oil

block (5)

• Remove hex cap screw (9) from

inside oil pre-heater block and
clean. NOTE: Do not discard (5).

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

Ref. Part

No. No. Qty. Description

1 8992 1 cartridge heater
2 9813 1 pre-heater face plate
3 9869 6 hex cap screw *
4 9869 4 o-ring 13/16" OD *
5 2901 1 oil block
6 9029 2 fitting
7 9869 2 o-ring 5/16" OD *
8 8498 1 oil gauge

9 7242 1 hex cap screw
10 9869 1 o-ring 1/2" OD *
11 7418 1 washer
12 7109 3 plug
13 9366 1 snap disc assembly
14 7242 1 button hex screw

* contained in tune up kit 9869

36

Section 13 - Service / Maintenance

Maintenance - OIl Pre-Heater (cont.)

3. Clean Oil Pre-Heater Block

• Clean oil pre-heater block using a parts washer and brush. NOTE: Make sure all

passages are clean.

• Blow dry the oil pre-heater block. inspect ALL passages making sure they are clear and

clean.

4. Reassemble Oil Pre-Heater

• Replace four 13/16" OD o-rings (4) with new.

• Replace cartridge heater. NOTE: Do not over-tighten.

• Re-attach face plate (2) using six new hex cap screws (3) provided with tune-up kit
(P/N 7240).

• Apply loc-tite to three block plugs (12) and replace.

• Replace hex cap screw (9) inside oil pre-heater block (5).

• Replace o-ring (10) with new.

5. Attach Air Pre-Heater Assembly

• Align the holes of the ignitor assembly and air pre-heater with those of the oil pre­heater (see page 34).

• Attach air pre-heater assembly to the oil pre-heater block (5) using two hex cap screws.
Tighten securely.

6. Re-install Pre-Heater Assembly

• Place the air/oil pre-heater assembly into the burner body.

• Align the holes of the pre-heater assembly with those in the burner body.

• Secure the assembly to the body by re-installing the button hex screw (14) and washer
(11). NOTE:Do not tighten this screw at this time.

• Replace the o-rings (7) on the PSI gauge and the oil line fittings (6) with new.
NOTE:Do not tighten these fittings at this time.

• Adjust the pre-heater assembly for proper setting.The end of the turbulator should b
recessed approximately 1/4”into the burner tube (see page 38 for turbulator
adjustment).

• Once adjusted tighten button hex screw (14) and fittings (6)securely.

7. Re-connect Electrical

• Re-connect all wires previously disconnected in the electrical junction box (refer to
wiring diagram, page 21 and the burner reference diagram, page 51).

8. Reconnect PSI Gauge, Fuel Line and Air Line

• Reconnect the PSI gauge (8) to the fitting (6) and tighten securely.

• Reconnect the fuel line to the fitting (6) and tighten securely.

• Reconnect the air line by connecting the one end of the air line to the air solenoid and
the other end to the air fitting (see page 34).

9. Test Operation

• Follow start-up procedure, page 26.

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37

inlet 1” NPT

water drain

o-ring

bolt

washer

gasket

spring

outlet 1” NPT

strainer

o-ring

bowl

Section 13 - Service / Maintenance

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 seat­ed. Secure the top and bottom togeth­er using the bolt, washer and gasket
removed earlier.

8. Prime the fuel pump (see page 25).

Cleaning/Replacing Fuel Pump

strainer

gasket

hex cap screws

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

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).

38

Ignitor Replacement /

Adjustment

Section 13 - Service / Maintenance

1. Disconnect power to the heater.

2. Remove the pre-heater assembly

from the burner housing.
Disassemble and clean all parts
as instructed on pages
34-37.

3. Using a 1/4" wrench, carefully

remove the one-piece ignitor
from the air pre-heater.

4. Install a new one piece ignitor

(P/N 3730) to the top of the air
pre-heater.NOTE: The tips of the
ignitor should be 3/8" above the
center of the nozzle assembly
and should extend approximate­ly 1/8" beyond the end of the
nozzle. The tips of the one piece
ignitor should be 1/8" apart at
bend. Adjust as required and
tighten nut on the top of the
ignitor (see illustrations for clarifi­cation of placement).

5. Re-assemble pre-heater assembly

(see pages 34-37) carefully re­install the pre-heater assembly
into burner housing.The turbula­tor should be approximately 1/4”
from the end of the burner tube.
Adjust as required and secure the
pre-heater assembly to the burn­er housing by tightening the
adjustment screw on the side of
the burner housing (see illustra­tion).

1

/16”

electrodes should extend approximately
1/8” beyond nozzle tip

3

/8”

Side View

1/8”

Top View

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39

Air Pre-Heater Diaphragm
Replacement

1. Remove the four hex cap screws

from the diaphragm assembly and
discard.

2. Disassemble and discard diaphragm,

spring and o-ring .

3. Thoroughly clean remaining parts.

4. Re-assemble using new diaphragm,

o-ring, spring and hex cap screws.

Section 13 - Service / Maintenance

o-ring

iaphragm

d

piston

hex cap
screws

spring

Air Pre-Heater Nozzle Cleaning /
Replacement

1. Periodic cleaning of the nozzle

assembly may be required.

2. Carefully remove nozzle from the air

pre-heater block.

3. Disassemble the nozzle as shown

and clean thoroughly.Re-assemble
nozzle.

4. Carefully remove the quad ring from

the block and inspect. Replace if nec­essary.

5. Insert clean/new quad ring into the
air pre-heater block. NOTE: The quad
ring must be properly seated.
Failure to properly seat the quad
ring may result in leakage and
improper burner operation. DO NOT

INSTALL QUAD RING ON THE NOZ­ZLE.

6. Lubricate pin/seat and re-install noz-

zle. Tighten securely.

Failure to properly seat the quad
ring may result in leakage and
improper burner operation. DO

!

NOT INSTALL QUAD RING ON
THE NOZZLE.

Air Pre-Heater Diaphragm Assembly

body

fuel orifice

pin/seat

Air Pre-Heater Nozzle Assembly

nozzle assembly

quad ring

Proper Quad Ring Position

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

40

Section 13 - Service / Maintenance

NOTE: ALWAYS WEAR EYE, FACE AND BREATHING PROTECTION AND PROTECTIVE
CLOTHINGWHEN INSPECTING OR CLEANING CHAMBER OR HEAT EXCHANGER.

!

WARNING: DISCONNECT ALL ELECTRICAL POWER TO HEATER BEFORE SERVICING

!

Cleaning Combustion Chamber/ Heat Exchanger

1. Turn thermostat to the lowest setting; the heater must be completely cool to the touch

before attempting to clean the heater (place the fan/limit on the manual position to
start the fan and shorten the cooling time if the unit is hot). Turn off all power to the
heater (120 VAC) at the main disconnect. Place the fan/limit switch lever back into the
auto position so the fan is off upon restarting.

2. Remove the chimney connector from the heater.

3. Remove the burner and flame view port from the heater. Remove the galvanized panels

covering the gun/chamber doors.

4. Remove the gun/chamber doors from the heater by removing all of the screws.

NOTE: SPRAY ALL OF THE SCREWS WITH PENETRATING OIL TO PREVENT BREAK-

!

AGE. BEFORE REMOVING LET SET FOR FIVE MINUTES TO ALLOW THE OIL
TO PENETRATE. REPLACE STRIPPED OR BROKEN SCREWS.

Visit our website at: www.lanair.com

41

Section 13 - Service / Maintenance

CAUTION:THE CLEAN OUT PANEL MUST HAVE AN AIR TIGHT SEAL TO
PREVENT EXTREME DAMAGE TO THE COMBUSTION CHAMBER

!

CAUTION:TO AVOID SCREW BREAKAGE, DO NOT OVER-TIGHTEN

!

5. Use an industrial type canister vacuum cleaner with a high efficiency filter,or ash rake to

pull the ash to the front of the heat exchanger tubes for removal. Failure to clean heat
exchanger tubes annually will impair draft. Vacuum or shovel the ash from the combus­tion chamber.Inspect the combustion chamber and target brick. Use care when cleaning
the combustion chamber area so the target brick is not disturbed. Insufficient or irregu­lar cleaning intervals will cause inefficiency, random shutdowns, and extreme damage to
the combustion chamber.

6. Before replacing the gun/chamber access doors, replace the white gasket seals on the

doors (contact the Lanair Service Department).When replacing the gaskets apply a light
film of gasket adhesive to adhere the new gasket to the door. Lube the threads of the
screws with a high temperature lubricant. If any screws are stripped or broken, replace.

7. Re-install the galvanized cover panels.

8. Re-install the inspection port cover. Replace burner.

9. Remove the manifold clean out port cover on the front of the unit (marked 5 on illustra-

tion on page 41). Using an industrial type canister vacuum cleaner with a high efficiency
filter,remove all ash accumulation.

10. Install a new gasket and re-attach the clean out port cover using the screws removed

previously. Check your draft reading to make sure your barometric damper is properly
set (See Section 5).

11. Reconnect all power at the main breaker box, wait ten minutes before turning the ther-

mostat up. Your heater is now ready for normal operation.

NOTE: When changing the target brick, call the Lanair Service Department for assistance.

WARNING: DO NOT OPERATEYOUR FURNACE WITH CLEAN OUT PANELS
OR PORTS REMOVED

!

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

42

Section 13 - Service / Maintenance

Fuel By-Pass Regulator Assembly

adjusting screw

locking nut

cap

small plug

spring

Fuel By-Pass Regulator
Diaphragm Replacement

1. Disconnect power to the heater.

2. Remove the locking nut and adjusting

screw from the by-pass regulator
assembly.

3. Disassemble the by-pass regulator and

discard the small plug, spring, large
plug, washer and diaphragm.

4. Thoroughly clean and dry remaining

parts.

5. Re-assemble using new small plug,

spring large plug, washer and
diaphragm (Kit P/N 9874).

NOTE: Pay close attention to the posi­tions of the large and small plugs.

large plug

washer

diaphragm

body

Visit our website at: www.lanair.com

43

Section 14 - Troubleshooting

Initial Diagnosis:

When an operating problem occurs, a determination must be made whether or not the fuel
pump is pumping a sufficient amount of oil that contains no air or water.

Take these steps:

• Adjust the burner air regulator to -0- PSI.

• Turn pre-heater rocker switch off (red light off).

• Shut off oil supply line valve to the burner.

• Remove the fuel supply line from the supply tank.

• Attach a flexible piece of tubing at least 3 feet long to the outlet on the return side of
the oil by-pass regulator.

• Insert the tubing into the bottom of a large jar.

• Jump the cad cell circuit and start the fuel pump (see below).

• Attempt to fill the jar above the open end of the tubing.

• If the pump will not pump fuel, attempt to prime the pump (Section 10). If the pump
won’t prime refer to Flow Chart Item B.

If no air or water is present the flow must be determined.

• Pump fuel for 1 minute into a graduated container, if the flow rate is less the 250
MILS/Minute (8-1/2 Ounces), refer to Section 13 Troubleshooting Chart Item B.

If the flow rate is more than 250 MILS/minute (8-1/2 Ounces), refer to Troubleshooting
Chart Item C.

After repairs are made, remove the cad cell jumper wire, and reconnect the cad cell wires to
the oil primary.

By-passing the oil primary safety circuit:

Some trouble-shooting test may require the cad
cell safety circuit in the oil primary control to be
bypassed, to do this:

• Remove the 2 yellow wires from the F-F
terminals on the oil primary control.

Remove two yellow wires

FIRE HAZARD WARNING: DO NOT OPERATE YOUR HEATER IF THE OIL

!

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

PRIMARY SAFETY CIRCUIT IS NOT WORKING!

44

Section 14 - Troubleshooting

• Install a jumper wire between the two F-F
terminals.

• Push reset button for 2 seconds.

• Turn room thermostat up so that it calls for
heat.

• Disable the air operated fuel valve.

• To activate the oil primary momentarily dis
connect one end of the jumper wire on the
F-F terminals.The burner will attempt to fire.

IMPORTANT remove the jumper wire when
testing is complete, and replace the cad cell
wires. Do not run the heater with the cad cell

wires disconnected.

Disabling the air operated fuel valve.

Note: Most trouble shooting tests will require the air operated fuel valve to be disabled, to

do this:

• Adjust the heater air filter/regulator to -0- PSI.

Vacuum Gauge reading hints:

No reading 0-1 HG

• Pump not operating.

• Pump air locked and needs priming. Refer to section 10.

• Vacuum leak:  Pump shaft seal  Pump cover gasket

 Suction strainer gaskets  Low fuel level in tank
 Pipe connections suction side  Strainer in pump cover

Install jumper wire

Low to normal reading, 1-6 inches HG.

• Pump operating properly. • Fuel being used has a low viscosity.

• Fuel oil is being used. • Fuel is at room temperature (warm).

• High level of gasoline in the fuel (use approved fuels only).

High reading,7 inches of HG, or more.

• Fuel being used has to high of a viscosity. • Suction line strainer dirty or plugged.

• Fuel is too cold. • Check valve installed wrong or stuck.

• Fuel contains gear lubes (use approved fuels only).

Reading fluctuates (jumps).

• Vacuum leaks in the suction side of the piping to the pump.

• Low fuel level in the tank.

Visit our website at: www.lanair.com

45

Section 14 - Troubleshooting

Burner fuel pressure gauge reading hints:

Fuel gauge fluctuates (jumps):

• Suction Line Leak.

• Air in fuel, refer to Troubleshooting Chart Item B.

• Quad ring seal for the nozzle may be damaged.

• Seal in adapter block may be worn or damaged.

• Fuel pressure regulator seal leaking or dirty.

• Suction line strainer plugged or dirty.

• Dirty Pump Screen

Reading gradually decreases:

• Fuel pump output decreasing.

• Fuel viscosity decreasing.

• Orifice in nozzle is wearing.

• Dirty Pump Screen

Reading gradually increases:

• Fuel pump output increasing.

• Fuel viscosity increasing (cold fuel, and/or gear lube).

• Orifice in nozzle is becoming plugged.

Reading drops to –0- PSI when the burner is off.

• Dirt between the diaphragm and the seat in the by-pass regulator.

• Dirt between the plunger and the nozzle seat.

• Leak in the plumbing connections.

• Leak in the pre-heater assembly (damaged or missing o ring).

• Fuel pre-heater switch is off.

Steps to check the air operated fuel valve:

• Disconnect the two transformer wires from the terminal block in the burner.

• Jump the cad cell circuit (refer to page 43).

• Disconnect the fuel supply pump orange wire from the terminal block inside the
burner.

• Set the dial indicator as shown on the diaphragm piston.

• Zero the dial indicator.

• Start the burner so that the air valve opens.

NOTE: The dial indicator should read +.015 to .050, which references the diaphragm piston
travel.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

46

Section 14 - Troubleshooting

Symptom Possible Cause Corrective Action

A. Burner will not start 1. Main electrical power 1. Reset breaker

B. Burner attempts to fire, 1. Low oil in supply tank or 1. Fill tank, or drain and

but does not establish a contaminated fuel clean tank
flame

circuit breaker tripped

2. Service disconnect 2. Turn switch on or

switch off or fuse blown replace fuse

3. Thermostat turned down/ 3. Turn thermostat up,

improperly installed/ check wires/test
defective components/replace

4. Oil primary safety 4. Reset/test components,

tripped/defective replace if needed

5. Too much light showing 5. Eliminate light to cad cell

on cad cell/defective Test component

2. Plugged or worn nozzle 2. Clean or replace

3. Fuel pressure gauge 3. See section 6, Page 17

fluctuating/pumping system

4. Pre-heater switch is turned off 4. Turn switch on or test

or defective,or defective switch and cartridge heater
cartridge heater

5. Transformer/electrodes not 5. Test transformer/look

sparking for shorts & repair

Replace electrodes/
transformer

6. No air pressure/defective 6. Turn compressor on/test

regulator/defective solenoid regulator/solenoid. Replace

7. Water in air system 7. Clean air pre-heater and

8. Combustion blower not 8. See flame adjustment

properly adjusted or pages 29-31.
defective Replace blower

9. Improper draft 9. Check draft see page 15.

10. Plugged heat exchanger, 10. Clean heater including

or chimney manifold, chimney

defective components

drain water from system

Make sure chimney is
properly installed

Visit our website at: www.lanair.com

47

Section 14 - Troubleshooting

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.

3. Plugged heat exchanger, 3. Clean heater including

manifold, or chimney manifold and chimney

4. Wrong air pressure 4. See flame adjustment pages

5. Wrong fuel pressure or 5. See flame adjustment

pressure fluctuating pages 29-31. See fuel piping

6. Improper combustion blower 6. See flame adjustment

setting, or blower is defective pages 29-31. See fuel piping

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.

Make sure chimney is
properly installed

29-31

page 17

page 17

Air heater 112 Ω ±10%.
Oil heater 37 Ω ±10%.

2. Snap disc defective 2. Test snap switch for

3. Hi-Limit snap disc defective 3. Replace snap disc assembly

continuity if
pre-heater is cold

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

48

Installation Notes:

Visit our website at: www.lanair.com

49

Section 15 - Warranty

LANAIR 1O YEAR WASTE OIL HEATER

LIMITED WARRANTY

Lenan Corp., MANUFACTURER, hereby warrants that any part of manufacturer’s product shall be free from defect in

aterial and workmanship under normal use according to the provisions and limitations herein set forth for a period of

m

one (1)year provided same is returned (pre-paid) F.O.B. Janesville, Wisc. for inspection and warranty determination.

MANUFACTURER warrants the heat exchanger/combustion chamber for three (3) years from the date of purchase and

pro rata thereafter according to the following schedule: If a defect occurs during the first three years,

MANUFACTURER will repair or replace the combustion chamber/heat exchanger FREE* of charge. If a defect occurs

in years four through ten (4-10) MANUFACTURER will repair or replace your combustion chamber/heat exchanger.

IMPORTANT: Combustion chamber / heat exchanger must be maintained in accordance with the installation / operat-

ing instructions. This extended warranty does not cover normal wear items such as gasket material, chamber inserts,

nuts, bolts, labor costs, etc. The warranty card must be returned within ten (10) days of purchase date in order for this

Model Number DHI Series Heater Date Purchased:

Conditions That Will Void Warranty

• Use of liquids such as: solvents, brake fluid, gasoline, K-1, kerosene, paint thinners, gear lube, trans­former oil, cutting oils, anti-freeze,water or any other liquid not approved for use.

• Tampering with internal components

• Failure to inspect and clean combustion chamber/heat exchanger at the end of each heating season.

• Continuous over-firing of the unit

• Heater has not been installed or serviced in accordance to the installation / operating manual.

• Alteration or misuse of any part

• Use of parts other than those supplied by Lanair.
NOTE: Lenan Corporation may require photographs of the heater installation for warranty
determination

Items Not Covered Under Warranty

• Any portion of the combustion chamber / heat exchanger if:

- The unit is not installed per the owners manual.

- The yearly inspection requirements are not current.

- If the heater is used for a purpose for which it is not intended.

- If the heater is not operated in accordance with the printed instructions in the

- If any alterations or unauthorized repairs are made to the unit.

• Damage incurred from overfiring, abuse, neglect, shipping, natural acts, misuse or accident.

• Labor costs for service calls for any reason including:

- Cleaning or performing required maintenance.

- Installation corrections

- Any parts installation.

• Parts that are replaced because of normal wear and tear.

• Goods purchased under this agreement shall be used exclusively by the buyer and no
other person or third party shall benefit from the express or implied warranties contained
in the agreement.

Your guaranteed replacement cost will be shared by MANUFACTURER 50/50.

warranty to be valid. Warranty is limited to original purchaser

*MANUFACTURER’S determination regarding repair or replacement is final.

Cost of freight is owner ’s responsibility.

QUESTIONS?... Contact Customer Service at 1-800-753-1601 M-F 8:00 am- 4:15 pm CST

50

uel Supply

F

P

djustment

A

Oil Pressure
Gauge

re-Heater

Screw

il

O

re-Heater

P
Block

gnitor

I

Pre-Heater

Block

View Port

Section 16 - Burner Reference Diagram

anual

M

Reset &

Snap Disk

Air

Air

Supply

To Combustion

lower

B

Pre-Heater

Switch

Air

olenoid

S

Air Supply

Electrical Quick

Disconnect

To Transformer

Cad Cell

Burner Cover

Visit our website at: www.lanair.com

51

To Oil Primary

To “F”

Terminals

Lanair Waste Oil Heaters & Boilers

4109 Capital Circle

Janesville,Wisconsin 53546

608-752-1601

www.lanair.com

© 2006 Martrade LLC Lanair is a registered trademark of Martrade LLC P/N L44

REVISED 1-06