Page 1
MODEL OWH-250
250,000 BTU
MODEL OWH-150
150,000 BTU
MODEL OWH-350
350,000 BTU
MODEL OWH-500
500,000 BTU
By
WASTE OIL FIRED HEATERS
Installation, Operation, And Service Instructions
Manual
240v
Thank you and congratulations on your purchase of an Omni Waste Oil Fired 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 Heat5714 1st AvenueSpokane Washington 99212.(509)534-1022www.econoheat.com
Rev 4/2013
performance.
Page 2
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 installation,
operation, and service of Omni Waste oil fired 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 a primary or auxiliary heat source, but not the only
source of heat. 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 become inoperative
during subfreezing weather, i.e. supply tank empty, filter plugged, etc.
UNCRATING: Immediately upon uncrating units, check rating plate for certainty
of electrical and mechanical characteristics. Also, 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 filed for those missing parts.
2 Installation, Operation, And Service Instructions
Page 3
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 installation operation and maintenance of your
new furnace. Before installing or operating this appliance, make sure you read and understand
this manual.
IMPROPER INSTALLATION, ALTERATIONS, 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 Installation
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. Even if the heater is installed correctly and adequate draft achieved, a
flue passage blockage will affect the draft. Burning used oil is similar to burning wood. A fine gray
ash accumulates in the chamber and flue passage. This accumulation of ash will eventually affect
the draft. It is important to remove this ash before the draft is affected.
These topics are discussed in detail on the pages listed above. 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 heater.
Installation, Operation, And Service Instructions 3
Page 4
MODEL
OWH-150
OWH-250
OWH-350
OWH-500
BTU’S/HR INPUT
150,000
250,000
350,000
500,000
BTU’S/HR OUTPUT
120,000
215,000
300,000
410,000
GALLONS PER HOUR
1.0
1.75
2.4
3.4
VOLTAGE REQUIREMENTS
115
115
115
115
AMPS FULL LOAD with
Pump
14.6
17.0
18.7
23.5
FAN MOTOR HP
1/4
1/3
2 @ 1/4 each
2 @ 1/3 each
FAN MOTOR RPM
1075
1075
1075
1075
FAN DIA/PITCH
18/36
24/18
18/36
24/18
CFM (FREE AIR)
3762
4466
6275
9001
CFM W/ DUCTWORK at 100
FT
1380
2000
1600
3701
EFFECTIVE AIR FLOW
50 FT
60 FT
70 FT
100 FT
FLUE SIZE
8”
8”
8”
10”
WEIGHT W/ BURNER
240 LBS
365 LBS
400 LBS
660 LBS
SHIPPING WEIGHT
375 LBS
535 LBS
575 LBS
725 LBS
DIMENSIONS L/W/H
42-22-25 ½
44-30-28 ½
54-29 ½-28 ½
72-38-34 ½
SHIPPING DIMENSIONS
L/W/H
64 ½-30-49
64 ½-39-49
76-38-49
92-44-50
SPECIFICATIONS
Heater
(Top)
MODEL A B
OWH-150 35 ½” 20”
OWH-250 35 ½” 22 ¼”
OWH-350 47 ¾” 22 ¼”
OWH-500 63 ¼” 28 ¾”
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. These appliances are designed for commercial or industrial use only. Installation and use
of this waste-oil burning appliance shall be in accordance with the Standard for the
Installation of Oil Burning Equipment-ANS/NFPA 31-1987, and National Electric Code ANSI/NFPA 70-1990 and the requirements of the inspection authorities having jurisdiction.
3. Output depends on BTU content of oil used.
4. Atomizing Air Pressure for all fuels 10 P.S.I.
5. Furnace not to be used with air filters.
6. Intended maximum outlet air temp. 200 degrees F. (93 degrees C) or less.
7. Clearance from combustible materials on all models not to be less than:
TOP- 6” BOTTOM- 18” SIDES- 18”
REAR- 18” FRONT- 48” FLUE PIPE- 18”
Mounting Dimensions:
4 Installation, Operation, And Service Instructions
Page 5
INSTALLATION PROCEDURES
STACK INSTALLATION
Figure 1 – Installation Diagram
1. Install a barometric damper (NOT included) in the stack if the draft up the stack exceeds -.08.
Draft up the stack must be -.04 to -.06 inches of water column. Check with draft meter between
the top of the heater and damper. The over fire draft should be a minimum of -.02- check
through flame inspection port. Closing the damper door can increase draft.
Installation, Operation, And Service Instructions 5
Page 6
OIL SUPPLY PIPING
WIRING
2. For optional draft inducers or power vent wiring, See Figure 2. One of these devices must be
installed where back draft is present. In building or correct draft cannot be achieved.
1. Use ONLY 3/8” nominal ID copper tubing with flare fittings only on the fuel suction from the tank
to the heater- Do NOT use ferrule fittings or Teflon tape on any pipefittings.
2. Keep suction line approximately 6” from bottom of oil tank to prevent suction of sludge. Drain
accumulated sludge and water from tank periodically.
3. Use only an inside oil storage tank to supply heater. Do not draw from an outside tank,
especially not an underground tank, directly to heater. A separate transfer pump from an outside
tank with proper filtration to the inside supply tank is acceptable and available from Econo Heat.
4. The fuel supply pump included with heater is to be mounted at tank level or below.
(figure 1). This pump turns slowly requiring a number of minutes to accomplish purging ALL air, if
bubbles, skips, even slight pulsations in the oil flow from pumps bleeder port is unacceptable and
must be removed assuring proper oil flow to heater. Otherwise, the flame sensor will not see
enough flame and heater will lockout. NOTE: PUMP ASSEMBLY MUST BE MOUNTED
HORIZONTAL.
5. Connect 3/8” oil supply line from the supply tank through the filter (figure 1) to the pump inlet
located same side as bleeder port. (figure 6) Continue oil supply line from pump outlet to bulk
head fitting secured to cabinet at left side of burner assembly (bulk head fitting has fuel flex hose
connecting it to burner).
See Schematic diagram below (Pg.7 Figure 2) and/or inside door of main electrical junction box on heater.
6 Installation, Operation, And Service Instructions
Page 7
Installation and use of this used oil burning appliance shall be in accordance with the
standard for the Installation of Oil Burning Equipment – ANSI/NFPA 31 – 1987, and
National Electric Code – ANSI/NFPA 70 – 1990 and the requirements of the inspection
authorities having jurisdiction.
DUCTING
OIL BURNER
WARNING
Figure 2 – Wiring Diagram
1. Wire 240V into main electrical box mounted on burner backside of heater cabinet with separate
circuit 20-amp protection using 12-gauge wire. Connect power line to black wire and all whites
(NUETRAL or COMMON) together. IMPORTANT, Connect ground wire to ground mounting point
in main junction box (green screw).
2. Connect wires from main junction box to remote oil pump power. Yellow to yellow and neutral
common white to white.
3. Wire low voltage thermostat into “T” marked terminals on oil primary control on burner. (Box on
burner gun assembly with red reset button). (figure 3).
All unit heaters are designed with a condenser-type pressure propeller fan for air deliver, and
have been successfully field ducted. (See Specifications) call factory for further assistance if
needed.
Installation, Operation, And Service Instructions 7
Page 8
Oil Pre-Heater Block
240v
Photo Eye
Flame Sensor
Transformer
Igniter Springs
240v
Pre-Heater Control
Circuit Board
Electrical
Terminal
Block
Igniter
Transformer
240v
Air Band
(combustion air
supply adjustment)
Oil
Primary
Control
240v
Air
Filter
Air
Pressure
Gauge
Motor Air
Compressor
Power
Indicator
Run
Indicator
Air
Pressure
Adjustment
Screw
Electrodes (2)
Figure 3 – Oil Burner (Back View Closed)
Figure 4 – Oil Burner (Back View Opened)
8 Installation, Operation, And Service Instructions
Page 9
Oil Valve
240v
Burner
Motor 240v
Oil
Inlet
Igniter
Transformer
240v
Oil
Primary
Control
220v
Figure 5 – Oil Burner (Front View)
Figure 6 –Oil Pump Diagram
Installation, Operation, And Service Instructions 9
Page 10
Oil Tank
Filter
Flow Control
Oil Pump
Internal Pump Filter
Air Compressor
On Burner
Oil Preheater
Inside Burner
Air Line to Preheater
Mixes with Oil at Nozzle
Suction Line
Pressure Line
Atomization Through Low Pressure
Preheat & Air Induction At Nozzle
Air Filter
OIL BURNER TECHNOLOGY
Oil Shut-off
Valve- Eliminates
start delays due to
possible drain
back
Spin-On Filter
Oil Primer Switch
Adjustable Motor
Speed- Initial set up
only- Once set, no
adjustment needed
thereafter
Oil Flow Control Supply Pump has the
ability to control flame even when various
viscosities are used- furnace or stove oil to 90
weight straight- flame remains stable
Inline Breaker
Figure 7 –Oil Pump Assembly
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 4) and is pre-heated to operating thermo setpoint, then
compressed air from the air compressor (figure 3) 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 5) 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 5) providing a very efficient and thorough burn of the waste oil.
Burner Components
10 Installation, Operation, And Service Instructions
Page 11
Igniter Transformer: (figure 3) Supplies high voltage to the electrodes generating
electrical arc igniting the oil.
Oil Valve: (figure 5) 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 3) Adjusts amount of air introduced into the combustion chamber. Air
band is adjusted at the factory for optimum performance, approx. ½ to ¾ inch open. NO
FIELD ADJUSTMENT REQUIRED unless in high altitudes application where minor
adjustment may be required.
Oil Primary Control: (figure 3) 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 4) Pre-heats the oil and air before entering combustion
chamber.
Photo Eye: (figure 4) Senses flame in combustion chamber and signals oil primary when
no flame is present.
Igniter Springs: (figure 4) Transfers the high voltage from the igniter transformer to the
electrodes (when door is closed)
Air Pressure Gauge: (figure 3) Displays air pressure supplied by onboard air
compressor.
Air Compressor: (figure 3) Supplies air used within pre-heater block to aid in
atomization of the oil.
Air Muffler/Filter: (figure 3) Filters air and muffles the sound generated by the
compressor.
Pre-Heater Control Circuit Board: (figure 4) 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 4 and 5) 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 5) Low-pressure nozzle for oil spray pattern.
Flame Cone: (figure 5) Specially engineered flame cone forces the flame into a swirl
pattern improving the burn thoroughness.
Burner Motor: (figure 5) Multitask motor turns the burner blower and integrated air
compressor.
Air Pressure Adjuster: (figure 3) 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 Adjustment: Adjust flame length in the heater combustion chamber
viewed through the inspection port located directly above the burner gun assembly by
increasing CW or decreasing CCW the adjuster located on the oil delivery pump
(figure7). The adjuster increases or decreases the pump motors RPM, which increases
or decreases the 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
length so flame is just slightly less than halfway down main combustion chamber tube.
Installation, Operation, And Service Instructions 11
Page 12
IMPORTANT:
Power Indicator: (figure 3) Indicates when power is present at the burner.
Run Indicator: (figure 3) Indicates that the burner is ready for operation after the initial
pre-heat time of approx. 5 minutes from initial power up.
1. IMPORTANT- Prior to starting the unit, pre-fill the filter and fuel line with oil to assist priming
procedure. Oil pump motor turns at low RPM’s and would take significant time to complete
priming process if not pre-filled. Make sure the oil supply line fittings are air tight. Vacuum
leaks are notoriously hard to find. Pressurizing the line with oil in it can help to locate leaks.
2. Proper draft. Draft is the gasses traveling through the heater and out the stack or flue. If
exhaust fans are present in your building, chances are a draft inducer will be needed. Call our
factory or see our website for help, www.econoheat.com
3. During the initial power up process the burner is locked out from energizing 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 and oil pump.
4. Making sure the thermostat is turned off, apply power to the burner. Switch burner main
power switch to ON position. After allowing the oil pre-heater time to establish temperature
setpoint, approximately 5 minutes. Jump the “T” terminals on the Oil Primary Control (figure
3). 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.
5. Priming the oil pump: Open bleeder valve one turn until all air is expelled (figure 6). 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.
6. 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.
7. Combustion air band (figure 3) 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.
Inspect flame length through inspection door located above burner gun assembly. End of
flame should reach no further than ½ way down combustion tube. To accomplish this flame
length, use adjustment knob on opposite side of oil pump. NEVER ATTEMPT TO START
HEATER WHEN COMBUSTION CHAMBER IS HOT AND A DELAYED START.
12 Installation, Operation, And Service Instructions
Page 13
INITIAL START PROCEDURE
MAINTENANCE SCHEDULE
8. IMPORTANT- Prior to starting the unit, pre-fill the filter and fuel line with oil to assist priming
procedure. Oil pump motor turns at low RPM’s and would take significant time to complete
priming process if not pre-filled. Make sure the oil supply line fittings are air tight. Vacuum
leaks are notoriously hard to find. Pressurizing the line with oil in it can help to locate leaks.
9. Proper draft. Draft is the gasses traveling through the heater and out the stack or flue. If
exhaust fans are present in your building, chances are a draft inducer will be needed. Call our
factory or see our website for help, www.econoheat.com
10. During the initial power up process the burner is locked out from energizing 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 and oil pump.
11. Making sure the thermostat is turned off, apply power to the burner. Switch burner main
power switch to ON position. After allowing the oil pre-heater time to establish temperature
setpoint, approximately 5 minutes. Jump the “T” terminals on the Oil Primary Control (figure
3). 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.
12. Priming the oil pump: Open bleeder valve one turn until all air is expelled (figure 6). 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.
13. 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.
14. Combustion air band (figure 3) 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.
15. Inspect flame length through inspection door located above burner gun assembly. End of
flame should reach no further than ½ way down combustion tube. To accomplish this flame
length, use adjustment knob on opposite side of oil pump. NEVER ATTEMPT TO START
HEATER WHEN COMBUSTION CHAMBER IS HOT AND A DELAYED START OCCURS.
WEEKLY
--- Drain water from storage tank.
MONTHLY
--- Check your ash accumulation for best performance, remove if excessive (the size of unit, type
of oil and run time are all contingent factors).
--- Change or Replace Spin-On Filter (figure 14). 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).
--- Swing out burner assembly clean out door and clean flame cone. (figure 5 and figure 8).
--- Open the swing out doors on both sides of the furnace. The swing out door opposite of the
burner assembly requires the removal of the access panel allowing simple entry to the
combustion chamber and heat exchanger(s) to vacuum out the accumulated ash & soot (hepa
filter recommended). (figure 12).
Installation, Operation, And Service Instructions 13
Page 14
When cleaning,
inspect all three
pieces thoroughly.
When disassembling
--- Clean Suntec pump filter. Remove pump cover for access. (figure 13). CAUTION!-Be careful
of gasket.
--- Clean air compressor filter element.
YEARLY
--- Clean flue pipe stack-to loosen soot remove stack at top of heater and tap thoroughly. Then
vacuum upper heat exchanger(s).
--- Inspect electrode adjustment. (figure 10). Due to erosion, adjustment may change.
--- Replace nozzle every 3-5 years depending on usage (figure 5, 9, 11). Will lose efficiency due
to erosion. This can be accessed by swinging burner clean out door open. (figure 8)
---IMPORTANT: TO TURN POWER OFF, Remove electrical plug from heater cabinet to burner.
Remove 9/16” burner door securing nuts, swing open burner clean out door. Remove nozzle with
5/8” socket. (figure 8, 9)
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 clean out door back for inspection. (figure 5, 10, and 11)
CAUTION: TURN OFF MAIN ELECTRIC SUPPLY SWITCH 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 10). IMPORTANT NOTE:
be sure nozzle is centered, if nozzle is higher than center, press nozzle down to bottom out preheater stand.
To adjust, open burner clean out door (figure 8), 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 8 dimensions have been altered.
Figure 8 – Burner Door View Figure 9 – Nozzle Assembly Detail
14 Installation, Operation, And Service Instructions
Page 15
Nozzle
Electrodes
Pre-Heater
Control Card
Thermocouple
Pre Heater Oil
Figure 10 – Electrode Adjustment Detail
Figure 11 – Pre-Heater Block Detail (Removed From Burner for Clarity)
Figure 12 – Combustion Chamber and Heat Exchanger Cleanout Door, Models OWH 250, 350, 500
Installation, Operation, And Service Instructions 15
Page 16
Remove 4 bolts
for access to
strainer filter.
CAUTION must
be careful not to
destroy the inner
gasket during
removal of the
housing
Filter Housing
Spin-On Filter
Pancake Filter Housing
Pancake
Filter
Suntec Gasket
Suntec
Strainer
Filter
Suntec Fuel Pump
Figure 13 – Pump Strainer
Figure 14 – Oil Filter (Spin-On Filter above, Pancake Style Filter below)
16 Installation, Operation, And Service Instructions
Page 17
Most Likely Less Likely Least Likely
Symptom Cause Remedy
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, remove pump
cover
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 tighten fittings.
Inadequate Fuel Supply Clean filter. Check all 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. May 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-reprime 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 them. 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
speed.
temperature setting being (See #6 for remedy)
achieved in area to be Temperature setting wrong
heated. On high limit fan safety switch. Check temperature setting and adjust as necessary.
High limit safety switch bad Replace high limit fan safety switch.
TROUBLE SHOOTING
Installation, Operation, And Service Instructions 17
Page 18
7. Heater rumbles and Pump setting wrong Pump not functioning properly-over firing. May need RPM
excessive heat blow back readjust. Reset flame slightly less than ½ way down tube
from flame vision port. combustion chamber. Use adjustment knob on pump motor.
(See Figure 7).
Draft incorrect. If proper draft Set draft. Clean out combustion chamber and exchangers
can’t be achieved, heater could of ash. Check draft-reset if needed.
have excessive amount of ash and
wont allow sufficient draft.
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. Due to back draft. Flame end Swing open burner door and clean ash build up from flame
Need to reset primary. cone may have ash. end cone. (See Figure 5 & 8).
Flame too small Increase pump motor speed (See Figure 7).
9. Proper draft setting Negative draft in building May need to install power vent/draft inducer’s in stack.
cannot be achieved or exhaust fans present. (See Figure 2 for wiring).
Excessive ash buildup/Heater Clean ash and soot from combustion chamber and heat
exchangers.
10. Poor or reduced heat Flame too small Nozzle may be plugged with debris-usually after filter is cleaned.
production. Entire fuel supply may be plugged. Clean filter both, oil strainer and oil pump screen.
Excessive ash buildup exchangers Clean ash from combustion chamber and exchangers.
Through vision port, check flame May need to readjust pump RPM. (Use knob on pump motor).
to see if flame is smaller than usual. (See Figure 7).
18 Installation, Operation, And Service Instructions
Page 19
Omni Unit Heaters 150, 250, 350, 500
Fifteen (15) Year Limited Warranty
Econo Heat (manufacturer) warrants to the purchaser of Unit Heaters 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,
unit heater is to be sent to the factory with freight prepaid. Econo Heat 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#
requires model and serial numbers, description of part being replaced and nature of defect. Call factory to receive RA#.
Warranty Covers:
1. Combustion Chamber and Heat Exchanger full Fifteen (15) years limited. *full repair or
replacement, (Parts Only)
2. Oil Heater Block, twenty (20) years. (Part Only)
3. Oil Heater Block Controller PCB, three (3) years. (Part Only)
4. All other components, one (1) year. (Parts Only)
This warranty is void if:
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. Installation not in accordance with instructions.
4. Has not been properly maintained, operated or has been misused.
5. Wiring not in accordance with diagram furnished with unit heater.
6. Unit heater is operated in the presence of chlorinated vapors.
7. Air through unit heater is not in accordance with rating plate and specifications.
Warranty is limited to the original purchaser.
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 is not responsible for any labor cost unless prior authorization in
writing has been obtained.
NOTE: Combustion Chamber Warranty is specific to material and workmanship. Workmanship means
Econo Heat warranties the welds are good and will hold. Material means they will not corrode through due
to sulfur in the ash that accumulates during operation. Warranty does not apply to units that experience
overheating stress cracks. These are not incurred because the materials are inadequate for the application
nor are they results of a weld breaking lose because of bad penetration, which is easily recognized by the
metal left beneath the weld. These cracks occur as a direct result of (1)improper draft, either by inadequate
initial installation and setup, which requires (a) establishing a proper draft during installation (b) back draft
has occurred due to ash buildup, backing up hot gas passageways in either the exchangers, the stack, or
both. (2) Over firing by setting oil supply pressure too high (see manual for proper setting) these are all
cases of thermal overload.
* Under normal use only. If misuse or abuse is deemed apparent after inspection, warranty is void.
Installation, Operation, And Service Instructions 19
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20 Installation, Operation, And Service Instructions
Page 21
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 ________________________________________________________________________
Installation Checklist
Installation, Operation, And Service Instructions 21
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