Omni OWR-150 Service Manual

By

WASTE OIL FIRED MOBILE RADIANT HEATER

Operation and Service Instructions

Manual

Thank you and congratulations on your purchase of an Omni Waste Oil Fired Mobile

Radiant Heater. You have selected a high quality, precision-engineered piece of

equipment, designed to give you many benefits as well as years of outstanding

Econo Heat♦5714 1st Avenue♦Spokane Washington 99212.♦[phone]♦www.econoheat.com
100267 Rev A2

MODEL OWR-150

performance.

PRECAUTIONS

Waste oil may contain many foreign materials. Waste oil may also contain
gasoline. Therefore, specific precautions on the handling and storage of waste
oils are to be observed when using, cleaning and maintaining this heater. Use a

screen in a funnel when pouring oil into storage tank to catch foreign
material, i.e., gasket material and sealant fibers, etc. WARNING: This
appliance is not designated for use in hazardous atmospheres containing
flammable vapors or combustible dust, or atmospheres containing
chlorinated or halogenated hydrocarbons. Do not expose this unit to rain
or moisture. If installed in high moisture atmosphere, a special cover for
the integrated air compressor must be obtained from factory to avoid
rusting of internal raw metals. If this occurs, see trouble-shooting guide for
remedy. Uses only crank case oil, gear oil, hydraulic oils, auto trans. Fluid or #1

and #2 furnace oil. Do not use old, contaminated oils that have been stored in
underground tanks or outside barrels for long periods. Excessive water and
sludge may be present, causing quick filter plugging.

NOTES: The instructions contained in this manual apply to the operation and
service of Omni Waste oil fired mobile radiant heaters. The following instructions
should be carefully followed for obtaining the best possible installation, operation
and service conditions. Specifications are subject to change without notice. This
heater was designed to be an auxiliary heat source and provide economical
disposal of waste oil. Proper operation depends on the consistency of the oil. Any
water or foreign material in the oil may cause the unit to shut down. If a
continuous stream of oil cannot be guaranteed at the heater, the main heating
system should be set above freezing which will prevent any building damage if
the waste oil heater were to overcome inoperative during subfreezing weather,
i.e. supply tank empty, filter plugged, etc.

UNCRATING: Immediately upon uncrating units, check the unit for any damage
that may have been incurred in shipment, if any damage is found, file a claim
with the transporting agency. The unit has been tested and inspected at the
factory prior to crating and was in perfect condition at that time. If anything is
missing check packing slip for indications of possible backorder of those parts or
components. Otherwise a claim must be for those missing parts.

2

Operation, and Service Instructions

IMPORTANT

NOTICE TO OWNER

AND INSTALLER

To enjoy the long term benefits of burning your used oil in an Omni Waste Oil Burning appliance,
it is necessary to become familiar with the correct operation and maintenance of your new heater.
Before operating this appliance, make sure you read and understand this manual.

IMPROPER OR LACK OF MAINTENANCE

WILL VOID THE WARRANTY

The most critical sections of this manual are in order of importance as
follows:

• Basic Operation Knowledge

• Oil Suction Line

• Correct Draft Over Fire

• General Maintenance Requirements

Identical to any gas or oil furnace, without adequate draft over the fire, the combustion
gases cannot escape the furnaces. The flame will lengthen resulting in an overheated
combustion chamber. Burning used oil is similar to burning wood. A fine gray ash accumulates

in the combustion chamber. This accumulation of ash will eventually affect the performance of the
heater and must be removed.

These topics are discussed in detail on the following pages. Please familiarize yourself with these
sections of your manual. Spending a few minutes to review this material will assure that you
receive the return on investment that you expect from your Omni Radiant heater.

Operation and Service Instructions 3

SPECIFICATIONS

BTU’S/HR OUTPUT 150,000
GALLONS PER HOUR 1.0
VOLTAGE
REQUIREMENTS

120V 60Hz

Single Phase
AMPS FULL LOAD 8.4 A
WEIGHT 180 LBS
TANK CAPACITY 10.6 Gallons
DIMENSIONS L/W/H 50”x28”x34”

Notes:

1. All illustrations and specifications contained herein are based on the latest information

available at the time of publication approval. Econo Heat reserves the right to make
changes at any time without notice, in materials, specifications, and models or to
discontinue models.

2. Output depends on BTU content of oil used.

3. Atomizing Air Pressure for all fuels 10 P.S.I.

Figure 1 – Temperature Diagram

4

Operation, and Service Instructions

Figure 2 – Inclination

34”

50”

Figure 3 – Dimension

Operation and Service Instructions 5

WIRING DIAGRAM

OIL

PREHEATER BL OCK

CONTROLLER

L1

L2

RED

RED

WHT

RED

BLU

WHT

PRI

WHT

WHT

WHT

BLK

BLK

ORN

WHT

Oil Valve

Fuse

BLK

BLK

BLOWER MOTOR

WHT

RED

BLOWER TIMER

8
9

Delay Timer

Power Switch

5

2

3

RED

Power Plug

WHT

THERMO­COUPLE

Bi
METAL
HIGH
LIMIT
SWITCH

500W
HEAT
ROD

OIL

PREHEATER

BLOCK

RED

WHT

HTR

BLU

WHT

HIGH

VOLTAGE

TRANS-

FORMER

BLK

OIL PRIMARY CONTROL

(IE, Honeywell, etc.)

PHOTO EYE

FLAME SENS OR

WHT

BLK

ORN

THERMOSTAT
CONNECTION

RADIANT HEATER

6

Operation, and Service Instructions

A

OIL BURNER

Igniter

Transformer

Air Band

(Combustion Air

Supply

djustment)

Figure 4 – Oil Burner (Back View Closed)

Run

Indicator

Power

Indicator

Oil Pressure

Gauge

Oil Primary

Control

Air Pressure

Gauge

Air Pressure

Adjuster

Air
Compressor

Operation and Service Instructions 7

Oil Pre-Heater

Pre-Heater Control

Circuit Board

Block

Air

Muffler/Filter

Photo Eye

Flame Sensor

Transformer

Igniter Springs

Figure 5 – Oil Burner (Back View Opened)

Electrical

Terminal Block

Heater

Electrical

Schematic

Oil Valve

Figure 6 – Oil Burner (Front View)

8

Burner

Motor

Electrodes

Nozzle

Flame Cone

Operation, and Service Instructions

Fuel Regulator

Fuel Filter

Fuel Pump

Figure 7 – Radiant Heater (Back View)

Omni’s patented burner technology improves the efficiency of the oil burn process by continuous
stabilization of the oil viscosity. Optimum atomization (spray) is accomplished by precisely pre­heating the oil and air prior to introduction to the combustion chamber. The waste oil enters into
the Oil Pre-Heater Block (figure 5) and is pre-heated to operating thermo setpoint, then
compressed air from the air compressor (figure 4) is mixed with the oil prior to spraying out the
nozzle similar to fuel injection, by breaking up the oil droplets into a finer mist or spray
(atomization). Electrodes mounted just above the nozzle (figure 6) provides continuous electrical
arc across electrode to electrode igniting the fine oil mist as it sprays out of the nozzle. Once
ignited the flame is forced into a swirl caused by the burners blower and specially designed flame
cone (figure 6) providing a very efficient and thorough burn of the waste oil.

Burner Components

• Igniter Transformer: (figure 4) Supplies high voltage to the electrodes generating
electrical arc igniting the oil.

OIL BURNER TECHNOLOGY

• Oil Valve: (figure 6) energizes when burner is running and de-energizes when burner is
not running eliminating bleed back of oil out of the Pre-heater block.

• Air Band: (figure 4) Adjusts amount of air introduced into the combustion chamber. Air
band is adjusted at the factory for optimum performance ½ to ¾ inch. NO FIELD

Operation and Service Instructions 9

ADJUSTMENT REQUIRED unless in high altitudes application where minor adjustment
may be required.

• Oil Primary Control: (figure 4) Controls the oil burner ignition. Checks for flame in the
combustion chamber, if no flame is detected within 45 seconds, the oil primary will
shutdown the oil burner. To restart the unit, reset the red button on the oil primary.

• Oil Pre-Heater Block: (figure 5) Pre-heats the oil and air before entering combustion
chamber.

• Photo Eye: (figure 5) Senses flame in combustion chamber and signals oil primary when
no flame is present.

• Igniter Springs: (figure 5) Transfers the high voltage from the igniter transformer to the
electrodes (when door is closed)

• Air Pressure Gauge: (figure 4) Displays air pressure supplied by onboard air
compressor.

• Air Compressor: (figure 4) Supplies air used within pre-heater block to aid in
atomization of the oil.

• Air Muffler/Filter: (figure 5) Filters air and muffles the sound generated by the
compressor.

• Pre-Heater Control Circuit Board: (figure 5) Precisely controls temperature of the Oil
Pre-Heater Block and controls safety feature of not allowing burner to energize until oil
has established operating thermo setpoint or shutdown burner if Pre-Heater Block
temperature falls below shutdown thermo setpoint.

• Electrodes: (figure 6) Provides continuous high voltage electrical arc from electrode to
electrode igniting the waste oil as it is being sprayed out of the nozzle.

• Nozzle: (figure 6) Low pressure nozzle for oil spray pattern.

• Flame Cone: (figure 6) Specially engineered flame cone forces the flame into a swirl

pattern improving the burn thoroughness.

• Burner Motor: (figure 6) Multitask motor turns the burner blower and integrated air
compressor.

• Air Pressure Adjuster: (figure 4) Adjusts the air pressure going to the pre-heater block.
Should be adjusted between 12 PSI and 13PSI as indicated on the Air Pressure Gauge
on the burner for thorough burn of the waste oil.

Note: In order to insure proper air adjustment, air gauge must read 0 when burner

is cycled off or powered down.

• Oil Pressure Gauge: (figure 4) Displays oil pressure at the burner. Adjust flame to 3/4
length of combustion chamber (figure 8) by increasing CW or decreasing CCW the
adjuster located on the left side of burner (figure 9). The fuel regulator increases or
decreases delivery of fuel to the burner. When you increase or decrease the fuel to the
burner you will notice the flame length will increase or decrease.

IMPORTANT:

Once adjusted for correct flame length, take note of oil gauge setting for bench mark
pressure reading needed when burning the specific fuel mixture generated by the owner.
PLEASE NOTE- Once flame is set the oil pressure gauge can read various pressures
when different viscosities of oils are used. The oil pressure gauge is an indicator of
where the PSI reading will be when that oil viscosity is being burned. The oil gauge is
used for servicing diagnostics assistance.

10

Operation, and Service Instructions

• Power Indicator: (figure 4) Indicates when power is present at the burner.

• Run Indicator: (figure 4) Indicates that the burner is ready for operation after the initial

pre-heat time of approx. 5 minutes from initial power up.

• Fuel Pump: (figure 7, 13) pumps fuel from fuel tank to burner.

• Fuel Filter: (figure 7, 14) filters fuel prior to entering pump.

• Fuel Regulator: (figure 7, 12) The fuel regulator increases or decreases delivery of fuel

to the burner. When you increase or decrease the fuel to the burner you will notice the
flame length will increase or decrease. Adjust flame to 3/4 length of combustion chamber
(figure 8) by increasing CW or decreasing CCW the fuel regulator located on the left side
of burner (figure 9).

INITIAL START PROCEDURE

1. During the initial power up process the burner is locked out from energi zing until the oil has
been properly pre-heated to operating thermo setpoint, approx 3 to 5 minute duration. Once
the oil has been pre-heated, power is then applied to burner componenets an d oil pump.

2. Apply power to the heater. Switch heater main power switch to ON position. Burner motor
will start to run but will not attempt to ignite. After allowing the oil pre-heater time to establish
temperature setpoint, approximately 5 minutes, heater will start to establish flame. Once the
burner is running, temporarily jump the “F” terminals on the Oil Primary. This will allow the
burner to run during the pump priming process.

3. Priming the oil pump: Open bleeder valve one turn until all air is expelled. This may need to
be done twice to insure all air is removed. IMPORTANT: When fully purged and flame is
established remove temporarily jumpers on “F” terminals of the Oil Primary to allow safety
features of the unit to operate properly.

4. Adjust air supply of integrated air compressor to 8-12 P.S.I. This is factory preset, however,
due to freight handling settings may be compromised.

5. Combustion air band (figure 4) should be open approximately 1/2” or until flame is clear
yellow, not orange. Opening the air band too far may cause delayed in starting or even
prevent the flame from starting.

Apply Power

& Power Switch On.

Operational Sequence Chart

Operation and Service Instructions 11

Green Lamp On

Oil Pre-Heat

Time Period 3-5

Minutes

Burner Motor

Runs, No

Ignition

Power Supplied to Oil

Primary. Amber Lamp

On

Flame Not

Established Within

45 Sec, Burner Will

Shutdown

Normal Running

Operation Time

Ignition Start

Sequence 45 Sec

Power Switch Off (DO

NOT UNPLUG UNIT

AT THIS TIME) Green

6 Minute Cool

Burner Motor

& Amber Lamps Off

Down Time.

Runs, No

Ignition

Blower Motor Stops

Running. Safe To

Unplug Unit.

To Adjust Lift Cap Up

To Lock Push Cap Down

Fuel Regulator

Back Side of Burner

Burner

Combustion

Chamber

Flame

¾ Length of
Combustion

Chamber

Figure 8 – Flame Adjustment Figure 9 – Fuel Regulator

WEEKLY

--- Drain water from storage tank.

MONTHLY

--- clean stainless filter screen in filter (figure 14) periodically and drain off any water

accumulation. Monitor : every application is different and may vary depending on contamination
of oils being used.

ONCE EACH SEASON

(OR MORE DEPENDING UPON USAGE OR CONTAMINATION OF OIL).

--- Clean flame cone. (figure 6).

--- Remove ash deposits from combustion chamber by opening front panel to gain access to

ash/drip pan inside combustion chamber. (figure 15).

--- Clean pump strainer. Remove pump cover for access. (figure 13). CAUTION!-Be careful of

gasket.

--- Clean air compressor filter element (figure 5).

YEARLY

--- Inspect electrode adjustment. (figure 11). Due to erosion, adjustment may change.

--- Replace nozzle every 3-5 years depending on usage (figure 6, 10). Will lose efficiency due to

erosion.

MAINTENANCE SCHEDULE

12

Operation, and Service Instructions

ELECTRODE ADJUSTMENTS

Electrodes are adjusted at time of manufacture. However, they should be check periodically and
at time of installation to be sure they are set as noted in the following dimensional drawing. Swing
burner door back for inspection. (figure 5, 10, 11)

CAUTION: UNPLUG HEATER BEFORE CHECKING OR ADJUSTING ELECTRODE SETTING.
NOZZLE POSITION IN RELATION TO ENDCONE/BURNER TUBE

Tip of nozzle must be ¼” ahead of inside radius of end-cone. If nozzle is behind inside radius of
end-cone, coking will occur and end cone can become clogged. (figure 11). IMPORTANT NOTE:
be sure nozzle is centered, if nozzle is higher than center, press nozzle down to bottom out pre­heater stand.

To adjust, loosen Preheat Sink securing nut and set screw, push fore or aft as needed.
WARNING: This adjustment is done at the factory and should not be moved unless Fig 10
dimensions have been altered.

When cleaning, inspect all three
pieces thoroughly. When
disassembling and reassembling
nozzle, keep facing up as shown.

Figure 10 – Nozzle Assembly Detail

Figure 11 – Electrode Adjustment Detail

Operation and Service Instructions 13

Pre-Heater
Control Card

Figure 12 – Pre-Heater Block Detail (Removed From Burner for Clarity)

Strainer

Pump Gasket

Allen Bolts (4)

Washer

Thermocouple

Filter Housing

Nut

Pump

Pump Cover

Filter Housing

Stainless Filter Screen

Figure 13 – Fuel Pump Figure 14 – Fuel Filter

Bolt & Washer

Figure 15 – Combustion Chamber Cleanout Door

14

Operation, and Service Instructions

Operation and Service Instructions 15

Symptom Cause Remed y

1. Heater shuts off ♦Manual reset ♦Requiring manual restart by reset button on.

2. Loss of prime overnight ♦Vacuum air leak in fuel line ♦Check all fuel connections. Tighten fittings.

Won’t hold vacuum ♣Plugged pump screen ♣ Check pump screen, may need cleaning-to access, remov e pump

IS TANK EMPTY? • Plugged filter or tank oil empty • Clean filter. Using vent port, reprime pump (See Figure 6 & 7).

3. Fails to start. ♦Vacuum Leak ♦Open bleeder port if air present. Check and tight en fittings.

♦Inadequate Fuel Supply ♦Clean filter. Check a ll fuel connections. Tighten fittings.

• No Pressure • Check, may need cleaning—to access, remove pump cover.

• Using vent port, reprime pump (See Figure 6 & 7)

•No Pre-heat • Be sure all wiring to pre-heater is tight-no loose connections.

• Bad firerod-Replace. Continuity at terminals.

•Auto start circuit not functioning • Check circuit control board and replace if necessary.(Call Factory)

• Check continuity at terminals of firerod limit snap switch.

Replace if needed.

•No Arc • Check springs to electrode rod adjustment (under transformer)

make sure they make good contact. Open burner door and make
sure electrode tips aren’t touching flame cone. Readjust.

•No Air Pressure • Check pressure regulator and adjust. Check air supply line for

restrictions or leaks. Pull compressor cover and inspect carbon

vanes. Ma y need to replace. Check filter, clean if needed.

4. Reduced air pressure, ♦Gauge may be bad . ♦Replace gauge.

cannot increase. ♦Intake filter muffler is plugged ♦ Remove & Clean with carburetor cleaner,

with dust or dirt. dry thoroughly. Do Not Use.

♣Compressor vanes may be worn. ♣ Replace carbon canes.

• Exposed to water. • Remove cover, clean rust with emery cloth.

5. Hard starting diminished ♦Partially plugged filter. ♦Clean filter. Using vent port-repr ime pump (See Figure 6 & 7)

flame. ♣Out of fuel ♣Refill Storage.
♣No oil to burner ♣ Clean pump screen-Remove pump cover. Using vent

port, reprime pump. (See figure 6 & 7)

•Restriction in nozzle usually only •Remove nozzle and check for foreign objects. (See Figure 9 and 11)

when initially installed. New lines •Aluminum Block Pre-heater inside burner should not build
may have foreign material in the m. up carbon. If carbon is present, pre-heat circuit is

malfunctioning. Thermocouple heat sensor wire could
have open circuit. Heat control board may have blown

circuit and circuit board fuse. Inspect both and replace
either if needed. (See Figure 11).

•Air band open too far •Close air band—while viewing flame; open air band

slowly until combustion chamber is clear, not orange.

6. Heater cycles frequently, ♦Heater over firing. ♦Investigate and locate reason for over firing. I.e., nozzle

without thermostat eroded, pump not functioning properly, decrease pump motor

TROUBLE SHOOTING

♦Most Likely •Less Likely ♣Least Likely

cover

speed.

16

Operation, and Service Instructions

7. Heater rum bles and ♦Pump setting wrong ♦Pump not functioning properly-over firing. May need RPM
excessive heat blow back readjust. Reset flame slightly less than ½ wa y down tube
from flame vision port. combustion chamber. Use adjustment knob on pump motor.

(See Figure 7).

8. Heater establishes flame ♦Photo eye cant see flame. ♦Clean photo eye which is smoked up by back draft smoke.
but locks out or shuts off.
Need to reset primary.

•Flame too small •Increase pump motor speed (See Figure 7).

9. Poor or reduced heat ♦Flame too small ♦Nozzle may be plugged with debris-usually after filter is cleaned.
production . ♣Entire fuel su pply may be plu gged. ♣Clean filter both, oil strainer and oil pump screen.

Operation and Service Instructions 17

Omni Radiant Heater Limited Warranty

Econo Heat (manufacturer) warrants to the purchaser of the Radiant Heater listed above will be
free from defects in materials and workmanship for the durations specified below, which duration
begins on the date of delivery to the customer. Customer is responsible for maintaining proof of
date of delivery.

If return is deemed necessary for warranty evaluation and determination of repair or replacement,
radiant heater is to be sent to the factory with freight prepaid. Econo Heat Inc. reserves the right
to determine appropriate action for repair or replacement.

No parts will be accepted by Econo Heat without RA# (return authorization number) clearly marked on outside of shipping package. Obtaining RA#

Warranty Covers:

This warranty is void if:

The above warranty is in lieu of all other warranties expressed or implied. Econo Heat does not authorize
any person or representative to make or assume any other obligation or liability that is not in accordance
with above warranty. Econo Heat Inc. is not responsible for any labor cost unless prior authorization

in writing has been obtained.

requires model and serial numbers, description of part being replaced and nature of defect. Call factory to receive RA#.

1. Combustion Chamber, one (1) year. (Parts Only)

2. Oil Heater Block, twenty (20) years. (Pa rts Only )

3. Oil Heater Block Controller PCB, three (3) years. (Parts Only)

4. All other components, one (1) year. (Parts Only)

1. Warranty registration card is not returned within thirty (30) days of purchase.

2. Any part or component subject to abuse or altered from original manufactures specifications.

3. Has not been properly m a i nta ined, operated or has been misused.

4. Radiant heater is operated in the presence of chlorinated vapors.

18

Operation, and Service Instructions

WARRANTY CARD

Please fill our, tear off and return to manufacturer

Return following warranty information to manufacturer within thirty (30) days of purchase or warranty will not be valid. (Please print or type).

Date of Purchase_____________________________________________________________________
Serial #__________________________ Model ____________________________________________
Customer Name_____________________________________________________________________
Address____________________________________________________________________________
City _________________________ State ________________ Zip Code ________________________
Dealer ____________________________________________________________________________
Address ___________________________________________________________________________
City_________________________ State _________________ Zip Code _______________________
Installed at ________________________________________________________________________

Operation and Service Instructions 19