Desa Tech B350D, B600D, R350A, R600A, SB350D Owner's Manual
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KEROSENE HIGH PRESSURE
PORTABLE FORCED AIR HEATERS
OWNER’S MANUAL
TABLE OF CONTENTS
Safety Information ............................................... 2
Product Identification ........................................... 3
Unpacking ........................................................... 3
Operation ............................................................. 3
Fuels .................................................................... 4
Ventilation
Operation ............................................................ 4
Storing, Transporting of Shipping ........................ 5
Operation with Portable Generator ...................... 6
Preventative Maintenance Schedule ................... 6
........................................................... 4
Troubleshooting ................................................... 7
Service Procedures ........................................... 10
Illustrated Parts Breakdown and Parts List ....... 14
Specifications
Wiring Diagram .................................................. 21
Maintenance Kits .............................................. 22
Technical Service .............................................. 22
Accessory .......................................................... 22
Replacement Parts ............................................ 22
Warranty
................................................... 21
and Repair Services .............Back Cover
Fill In For Your Records
Model No. _____________________
(Located on side panel)
Serial No. ______________________
(Located on fuel tank)
Date of Purchase: _______________
Save this manual for future reference.
For more information, visit www.desatech.com
SAFETY INFORMATION
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, operate
or service this heater. Improper
use of this heater can cause seri
ous injury or death from burns, fire,
explosion, electrical shock and
carbon monoxide poisoning.
WARNING: This product contains and/or generates chemicals
known to the State of California
to cause cancer or birth defects
or other reproductive harm.
DANGER: Carbon monoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs of
carbon monoxide poisoning resemble the flu, with
headaches, dizziness and/or nausea. If you have
these signs, the heater may not be working properly.
Get fresh air at once! Have heater serviced. Some
people are more affected by carbon monoxide than
others. These include pregnant women, persons
with heart or lung disease or anemia, those under the
influence of alcohol and those at high altitudes.
Make certain you read and understand all warn
ings. Keep this manual for reference. It is your
guide to safe and proper operation of this heater.
1. Use only kerosene, #1#2 diesel/fuel oil, JET A
or JP-8 fuels to avoid risk of fire or explosion.
Never use gasoline, naphtha, paint thinners,
alcohol or other highly flammable fuels.
2. Fueling
a) Personnel involved with fueling shall be
qualified and thoroughly familiar with the
manufacturerʼs instructions and applicable
federal, state and local regulations regarding
the safe fueling of heating units.
b) Only the type of fuel specified on the heaterʼs
data plate shall be used.
c) All flame, including the pilot light, if any,
shall be extinguished and the heater allowed
to cool, prior to fueling.
d) During fueling, all fuel lines and fuel-line
connections shall be inspected for leaks. Any
leaks shall be repaired prior to returning the
heater to service.
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e) At no time shall more than one dayʼs supply
of heater fuel be stored inside a building in
the vicinity of the heater. Bulk fuel storage
shall be outside the structure.
f) All fuel storage shall be located a minimum of
25 feet from heaters, torches, welding equipment
and similar sources of ignition (exception: the
fuel reservoir integral with the heater unit).
g) Whenever possible, fuel storage shall be
confined to areas where floor penetrations
do not permit fuel to drip onto or be ignited
by a fire at lower elevation.
h) Fuel storage shall be in accordance with
the federal, state or local authority having
jurisdiction.
3. Never use heater where gasoline, paint thinner
or other highly flammable vapors are present.
4. Follow all local ordinances and codes when
using heater.
5. Heaters used in the vicinity of tarpaulins,
canvas or similar enclosure materials shall be
located a safe distance from such materials.
The recommended minimum safe distance is
10 feet. It is further recommended that these
enclosure materials be of a fire retardant nature.
These enclosure materials shall be securely
fastened to prevent them from igniting or from
upsetting the heater due to wind action.
6. Use only in well vented areas. Before using
heater, provide at least a three-square-foot
opening of fresh, outside air for each 100,000
Btu/Hr of rating.
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7. Use only in places free of flammable vapors
or high dust content.
8. Use only with the electrical voltage and fre
quency specified on model plate.
9. Heater must be grounded. Use only a properly
grounded three-wire extension cord. Plug into
grounded outlet only.
10. Minimum heater clearances from combustibles:
Outlet: 8 Ft. Sides: 4 Ft.
Top: 4 Ft. Rear: 4 Ft.
11. Locate heater on a stable and level surface
while hot or running or a fire may occur.
12. When moving or storing heater, keep heater in
a level position or fuel spillage may occur.
13. Keep children and animals away from heater.
14. Never start heater when combustion chamber
is hot or if fuel has accumulated in combustion
chamber.
15. Unplug heater when not in use.
16. This heater has a built-in thermostat. Pluggedin heater may start at anytime.
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110098-01F
SAFETY INFORMATION
Continued
17. Never use heater in living or sleeping areas.
18. Never block air inlet (rear) or air outlet (front)
of heater.
19. Never move, handle, refuel or service a hot,
operating or plugged-in heater.
20.
Never attach duct work to front or rear of heater.
21. Never use gasoline, crankcase drainings,
naphtha, paint thinners, alcohol or other highly
flammable fuels.
22. Never leave a heater plugged in without adult
supervision if children or animals are likely to
be present.
23. Warning to New York City Residents For
Use Only At Construction Sites
cordance with applicable NYC codes under
NYCFD certificate of approval #4803, #4899,
#4908, #4909 or #4934 or NYC Board of Standards and Appeals calendar number 62-59-5A.
in ac-
PRODUCT
IDENTIFICATION
Hot Air
Outlet
Lower
Shell
Upper Shell
UNPACKING
1. Remove all protective packing applied to
heater for shipment.
2. Remove heater from shipping container.
3. Check heater for any shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.
OPERATION
The Fuel System: The motor turns the fuel pump.
The fuel pump pulls fuel from the fuel tank.
The fuel pump pushes fuel through a filter and a
solenoid valve and out the burner head nozzle. A
fine mist of fuel is sprayed into the combustion
chamber.
The Air System: The motor turns the fan. The
fan pushes air into and around the combustion
chamber. This air is heated and provides a stream
of clean, hot air.
The Ignition System: The electronic ignitor sends
voltage to the spark plug. The spark plug ignites
the fuel and air mixture.
The Flame-Out Control System: This system
causes the heater to shut down if the flame goes
out. It also allows the fan to continue running
after normal shutdown of heater. This cools the
combustion chamber.
Fuel
Pickup
Line
Fuel
Cool
Air In
Fuel Pump/
Fuel
Fuel
Cap
Tank
Thermostat
Figure 1 - 350,000 Btu/Hr Model
Hot Air
Outlet
Lower
Shell
Fuel Cap
Fuel Tank
Flame-Out Control
Reset Button
Figure 2 - 600,000 Btu/Hr Model
110098-01F 3
Flame-Out Control
Reset Button
Upper Shell
Thermostat
Power
Cord
Power
Cord
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Fuel Filter
Motor
Fan
Solenoid Valve
Burner
Head
Spark
Plug
Combustion
Chamber
Clean
Heated
Air Out
Figure 3 - Cross Section Operational
View
Filter
Electronic
Ignitor
Fuel
Fuel Line To
Solenoid Valve
Air for
Combustion
Nozzle
Fuel Tank
and Heating
FUELS
WARNING: Use only kerosene, #1#2 diesel/fuel oil, JET
A or JP-8 fuels to avoid risk
of fire or explosion. Never use
gasoline, naphtha, paint thinners, alcohol or other highly
flammable fuels.
Do not use heavy fuels such as No. 2 fuel oil or No.
2 diesel. Using heavy fuels will result in:
• clogged fuel filter and nozzle
• carbon build-up on spark plug
• the need of non-toxic anti-icer in fuel during
very cold weather
IMPORTANT: Use a KEROSENE ONLY storage
container. Be sure storage container is clean. Foreign
matter such as rust, dirt or water will cause flame-out
control to shut down heater. Foreign matter may also
require you to clean fuel system often.
VENTILATION
WARNING: Follow the minimum fresh, outside air ventilation requirements. If proper
fresh, outside air ventilation is
not provided, carbon monoxide
poisoning can occur. Provide
proper fresh, outside air ventilation before running heater.
Fresh Air Opening Requirements
Heater Size Square Feet Opening
350,000 Btu/Hr 10.5
600,000 Btu/Hr 18.0
Note: If you use more than one heater, provide extra
fresh air. Provide a fresh air opening of at least three
square feet for each 100,000 Btu/Hr rating.
OPERATION
WARNING: Review and understand the warnings in the Safety
Information section, page 2. They
are needed to safely operate this
heater.
TO START HEATER
1. Follow all ventilation and safety information.
2. Locate heater to provide maximum circulation
of the heated air. Follow all location require
ments noted in Safety Information, page 2.
3. Fill fuel tank with kerosene, #1#2 diesel/fuel
oil, JET A or JP-8 fuels.
4. Attach fuel cap.
5. Set thermostat dial to desired temperature.
Note: Thermostat setting must be higher than
surrounding air temperature.
6. Plug power cord of heater into three-prong,
grounded extension cord. Extension cord must
be at least six feet long.
WARNING: Use only a threeprong, grounded extension
cord. Use cord with proper wire
size to assure 120 volt operation.
See Extension Cord Wire Size
Requirements below.
Extension Cord Wire Size Requirements
6 to 100 feet long, use 14 AWG rated cord
101 to 200 feet long, use 12 AWG rated cord
201 to 300 feet long, use 10 AWG rated cord
301 to 400 feet long, use 8 AWG rated cord
401 to 500 feet long, use 6 AWG rated cord
7. Plug extension cord into standard 120 volt/60
hertz, three-hole, grounded outlet.
8. The motor will start when extension cord is
plugged into outlet. The heater should ignite
at once. If heater does not ignite, restart heater.
To restart heater, wait 60 seconds, then push
in flame-out control reset button. Flame-out
control reset button is at rear of heater near
power cord (see Figure 4, page 5).
Note: A cold heater may affect the thermostat setting.
This thermostat is a general-heating control. It is not
intended for precise temperature control. Adjust ther
mostat until heater cycles at the desired setting.
Note: If starting heater for first time, you may need
to prime the pump. If equipped, slightly open bleed
er valve of pump to allow air to escape. Quickly
close valve once fuel is seen. Wipe up any excess
fuel. If equipped with canister fuel filter, remove the
canister bottom and fill with fuel. Reassemble filter.
Wipe up any excess fuel. You may also have to do
this after taking heater out of storage.
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110098-01F
OPERATION
Continued
Flame-Out
Control
Reset Button
Figure 4 - Flame-Out Control Reset
TO STOP HEATER
CAUTION: Never unplug
heater while heater is running.
Heater must go through purge
cycle. The purge cycle cools the
combustion chamber. Damage
to heater can occur if combustion chamber is not cooled. Do
not restart heater until purge
cycle is complete.
1. Turn thermostat dial to lowest temperature
setting. This will cause heater flame to go
out. The motor will continue to run during the
purge cycle. This allows the fan to cool the
combustion chamber. When the purge cycle
is finished, the motor will stop. Do not unplug
heater until purge cycle is finished.
2. Unplug extension cord from outlet.
3. To temporarily
a temperature lower than air around heater.
Heater will cycle back on if air temperature
around heater matches thermostat setting.
TO RESTART HEATER
Button
stop heater, set thermostat at
STORING,
TRANSPORTING OF
SHIPPING
Note: If shipping transport companies require fuel
tanks to be empty.
1. Drain all fuel from fuel lines and pump/filter
(see Fuel Filters, page 12).
2. Clean and flush fuel filter in fuel pump if
equipped (see Fuel Filters, page 12).
3. Remove drain plug and drain fuel tank.
4. Replace drain plug.
5. If any debris is noted in old fuel, add 1 or 2
quarts of clean kerosene to tank, stir and drain
again. This will prevent excess debris from
clogging filters during future use.
6. Replace fuel cap or drain plug. Properly dis
pose of old and dirty fuel. Check with local
automotive service stations that recycle oil.
7. Add two gallons (350,000 Btu/Hr) or three
gallons (600,000 Btu/Hr) of clean kerosene,
#1#2 diesel/fuel oil, JET A or JP-8 fuels to
fuel tank.
8. Replace fuel cap.
9. Operate heater for 5 minutes (see
page 4).
10. Stop heater and let cool completely.
11. Remove drain plug and drain fuel tank.
12. Replace drain plug.
13. Properly dispose of old and dirty fuel.
14. If storing, store heater in a dry location.
Make sure storage place is free of dust and
corrosive fumes.
IMPORTANT: Do not store kerosene over summer
months for use during next heating season. Using
old fuel could damage heater.
Operation,
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CAUTION: Do not restart
heater until purge cycle is finished. The purge cycle cools the
combustion chamber.
1. Wait until purge cycle is finished after stopping
heater.
2. Repeat steps under To Start Heater
110098-01F 5
, page 4.
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FUEL
F
OPERATION WITH
PORTABLE GENERATOR
If the voltage does not measure in this range the
heater should not be plugged into the generator.
Operation, page 4, for starting, stopping
Refer to
and resetting heater procedures.
WARNING: Before operating
heater or any appliance from a
Alternator
portable generator, verify that
generator has been properly connected to earth ground. Improper
grounding or failure to ground
generator can result in electro
cution if a ground fault occurs.
Refer to owner’s manual supplied
by generator manufacturer for
proper grounding procedures.
The operating voltage range of the heater is 108 to
132 Volts (120 Volts +/- 10%). Prior to plugging
heater into generator the output voltage should
be verified (if generator is equipped with the au
tomatic idle feature, the output voltage should be
measured with the generator running at full speed).
Figure 5 - Typical Generator Grounding
Method (Generator construction may
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Ground
Lug
vary from that shown)
Ground Wire
(#10 AWG -
Stranded-Copper)
PREVENTATIVE MAINTENANCE SCHEDULE
WARNING: Never service heater while it is plugged in, operating
or hot. Severe burns and electrical shock can occur.
Item
Fuel tank
How Often
Flush every 150-200 hours of operation
or as needed
How To
See Storing,
, page 5
Copper
or Brass
Grounding
Point
Filler neck screen
Fuel filter assembly (Fuel
tank)
Fuel filter lines
Fuel filter (In pump or ex
ternal canister)
Spark plug
Fan blades and air
deflectors
Air passages around burner
head
Motor
6
Check for particles in fuel when filling
fuel tank. Clean when dirty
Clean twice a heating season or replace
as needed
Check and tighten loose connections
occasionally
Clean fuel filter element every 250
hours
Clean and regap every 300 hours of
operation or replace as needed
Clean each season or as needed
Check each season for dirt and
debris
Not required, permanently lubricated
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Lift out of fuel tank and rinse with
clean kerosene
See Fuel Filters, page 12
See Fuel Lines, Page 12
See Fuel Filters, page 12
See Spark Plug, page 10
See Fan Blades and Air Deflec-
tors, page 10
Remove debris and trash with a
clean, soft cloth
110098-01F
TROUBLESHOOTING
WARNING: Never service heater while it is plugged in, operating
or hot. Severe burns and electrical shock can occur. Only a qualified
service person should service and repair heater.
OBSERVED PROBLEM
Motor does not start when heater
is plugged in and thermostat set
ting is higher than surrounding
air temperature
POSSIBLE CAUSE
1. No power or low voltage at
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heater due to:
A) Damaged power cord or
extension cord
B) Wrong size extension cord
C) Heater plugged into outlet
with voltage lower than 120
volt
2. Loose electrical connections
3. Motor ove rload pro tector
tripped due to:
A) Dirty fan
B) Debris pulled into fan area
by fan
C) Binding pump
D) Low voltage
4. Flame-out control not reset
5. Damaged flame-out control
6. Damaged power relay
7. Damaged thermostat
8. Binding pump
REMEDY
1. A) Check condition of power
cord or extension cord. Repair
or replace if damaged
B) Use extension cord with
proper wire size (see To Start
Heater, page 4)
C) Make sure heater is plugged
into 120 volt/60 hertz outlet
2. Check connections. Tighten if
loose
3. A) See Fan Blades and Air
Deflectors, page 10
B) Remove debris from fan
and fan guard area
C) Turn fan by hand. If fan is
hard to turn, see Pump, page
12
D) See steps B and C under
item 1 above
Note: Be sure to reset motor
overload protector by pressing
reset button on top of motor
4. Press and release flame-out
co nt ro l re se t butt on . See
Figure 4, page 4 for button
location
5. Replace flame-out control
6. Replace power relay
7. Replace thermostat
8. Turn fan by hand. If fan is hard
to turn, see Pump, page 12
110098-01F 7
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OBSERVED PROBLEM
Heater will not ignite, but motor
runs for a short period of time.
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. A) Fuel tank empty
B) Water in fuel
C) Wrong fuel
2. Dirt in nozzle
3. Very low temperature may
cause fuel to thicken and not
flow
4. Dirty fuel filters
5. Wrong pump pressure
6. Spark plug wire disconnected
from plug
7. Spark plug problems due to:
A) Wrong gap
B) Plug wet with fuel
C) Carbon deposits on plug
D) Damaged plug
8. Solenoid valve not opening
REMEDY
1. A) Add fuel to tank
B) Check fuel tank for bubbles
of water in bottom. If found,
remov e fue l (see Storing,
Transporti ng, or
page 5). Clean tank and fuel
filters (see Fuel Filters, page
12). Fill with clean fuel
C) Remove wrong fuel (see
Storing, Transporting, or
ping, page 5). Clean tank and
fuel filters (see Fuel Filters
page 12). Fill with correct
fuel
2. Replace nozzle (see Nozzle,
page 10)
3. Move heater to warmer place
until fuel flows freely
4. Clean fuel filters (see Fuel
Filters, page 12)
5. Adjust pump pressure (see
Pump Pressure Adjustment
sections, page 11)
6. Connect spark plug wire to
spark plug
7. A) Adjust electrode gap to .075"
(see Spark Plug, page 10)
B) Clean fuel from spark plug
with clean, soft cloth
C) Replace plug if heavily
coated with carbon (see Spark
Plug, page 10)
D) Inspect plug for worn or
eroded electrodes. If found,
replace plug (see Spark Plug,
page 10)
8. Check electrical connections
and voltage to solenoid. If
good, replace solenoid valve
Shipping,
Ship-
,
WARNING: High Voltage!
9. Damaged electronic ignitor
8
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9. Replace electronic ignitor
110098-01F
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