Curtis Dyna-Fog Series 3 User manual

MODEL 2620/2630
INSTRUCTION MANUAL FOR
OPERATION, SERVICE AND MAINTENANCE

INSTRUCTION MANUAL
FOR
OPERATION, SERVICE AND MAINTENANCE
FOR
BLACKHAWK Model 2620, Series 2
and
MISTER III Model 2630, Series 3
Trade-mark Reg. U.S. Patent Office
INSECTICIDAL FOG GENERATOR
U.S. PATENTS: 2,715,390; 2,738,334; 2,857,332; 2,950,592; 2,970,430;
3,052,094; 4,030,695; 3,151,454; 4,343,719; 4,811,901
4,934.601
Canadian Patent: 762,939
German Patent: 31-48-522
Japanese Patent: 1,587,278
Other U.S. and Foreign Patents Pending.
Manufactured By
CURTIS DYNA-FOG®, LTD.
P.O. BOX 297
Westfield, Indiana U.S.A.
2

TABLE OF CONTENTS
SPECIFICATIONS………………………………………………………………………
TO THE NEW OWNER…………………………………………………………………
CORRESPONDENCE………………………………………………………………….
DESCRIPTION………………………………………………………………………….
WORKING PRINCIPLE………………………………………………………………..
SAFETY PRECAUTIONS……………………………………………………………..
OPERATION…………………………………………………………………………….
PREPARING THE ENGINE FOR OPERATION…………………………….
ENGINE OPERATION………………………………………………………….
STARTING THE ENGINE……………………………………………………...
STARTING A FLOODED ENGINE……………………………………………
STOPPING THE ENGINE……………………………………………………..
SELECTING A FORMULATION (2620)……………………………………...
SELECTING A FORMULATION (2630)………………………………………
FOGGING FOR INSECT CONTROL…………………………………………
PREPARING TO DISPENSE FOG……………………………………………
DISPENSING FOG……………………………………………………………..
MAINTENANCE…………………………………………………………………………
AFTER EACH USE……………………………………………………………..
FLUSH FORMULATION SYSTEM……………………………………
INSPECT FOR FORMULATION RESIDUES………………………..
AFTER EVERY FOUR HOURS OPERATION……………………………….
CLEAN THE ENGINE DISCHARGE (EXHAUST) TUBE…………...
AFTER EVERY EIGHT HOURS OPERATIONION………………………….
CLEAN THE FORMULATION FILTER……………………………….
CLEAN THE ENGINE NECK………………………………………………….
AFTER EVERY TWELVE HOURS OPERATION……………………………
CLEAN FORMULATION INJECTION NOZZLE……………………..
CHECK THE FUEL FILTER
BATTERIES……………………………………………………………………...
CARBURETOR……………………………………………………………………….…
IDLE NEEDLE ADJUSTMENT………………………………………………...
CARBURETOR SYSTEMS DIAGRAM……………………………………….
CARBURETOR ADJUSTMENT……………………………………………….
ADJUSTING THE FUEL NEEDLE…………………………………………….
ADJUSTING THE METERING LEVER……………………………………….
CARBURETOR ASSEMBLY DIAGRAM……………………………………..
TROUBLESHOOTING…………………………………………………………………
SYSTEMS DIAGRAM…………………………………………………………..
STORAGE AND SHIPMENT………………………………………………………….
PARTS IDENTIFICATION……………………………………………………………..
REPLACEMENT PARTS LIST FOR MODEL 2620…………………………
REPLACEMENT PARTS LIST FOR MODEL 2630…………………………
INDEX……………………………………………………………………………………
4
5
5
5
6-7
8-20
8
8-9
10
11
11
11
12
12
13
16-20
21-24
21
21
21
21
21
22
22
22
23
23
23
23-24
25-31
25
26
28
29
30
31
32-33
34-35
36
37
37-42
43-52
53
3

SPECIFICATIONS
BLACKHAWK SPECIFICATIONS
Model Number 2620
Type………………………….thermal aerosol fog, resonant pulse principle
Formulation Output………. 0-18 U.S. Gal/Hr. ……….............. 0-68.4 liters /Hr.
Engine Performance………………44 HP/Hr. …... 33 Kw/hr…... 8,300 Kcal/Hr.
Fuel Consumption……….. 0.6 U.S. Gal/Hr …………................ 2.3 Liters/Hr.
Weight (Empty)……………………. 41 Lbs. …………............………..18.6 Kg.
Weight (Full)……………………… . 75 Lbs. ……….…...........……......34.1 Kg.
Fuel Tank Capacity…………… 0.5 Gallons ……….……..........…... 1.9 Liters
Formulation Tank……….…. 3 U.S. Gallons ………………............. 11.4 Liters
Power Supply………………………………….(8) 1.5V “D’ size alkaline batteries or
a 12V DC automobile “cigarette
lighter” adapter.
Length………………………….…. 68.3 In. …………………...……173.5 Cm.
Width………………………………… 15 In. …………………….....….38.1 Cm.
Height………………………………. 16.8 In. …………………...…..….42.7 Cm.
Fog Particle Size………………. 0.5-50 Microns (mass median diameter)
Shipping Data:
L x W x H…………. 70 x 18 x 18 (In.) ……... 177.8 x 45.7 x 45.7 (Cm.)
Weight…………………… 66 Lbs. ………....………………..... 30 Kg.
Volume........................ 13.1 Cu. Ft. ................................. 0.36 Cu. M.
MISTER III SPECIFICATIONS
Model Number 2630
Type.................................................Thermal aerosol fog, resonant pulse principle
Formulation Output............. 0-12 U.S. Gal/Hr. ............................. 0-45.4 Liters/Hr.
Engine Performance....................... 44 HP/Hr. ..... 33Kw/Hr.......... 28,300 Kcal/Hr.
Fuel Consumption................ 0.6 U.S . Gal/Hr. .................................. 2.3 Liters/Hr.
Weight (Empty)................................... 39 Lbs. ......................................... 17.7 Kg.
Weight (Full)....................................... 72 Lbs. ......................................... 32.7 Kg.
Fuel Tank Capacity.............. 0.5 U.S. Gallons ........................................ 1.9 Liters
Formulation Tank Capacity..... 3 U.S. Gallons ...................................... 11.4 Liters
Power Supply............................................... (8) 1.5V “D” size alkaline batteries or
a 12V DC automobile “cigarette
lighter” receptacle
Length................................................ 61.0 In. .................................... 154.9 Cm.
Width..................................................... 15 In. ...................................... 38.1 Cm.
Height................................................. 16.8 In. ...................................... 42.7 Cm.
Fog Particle Size.................................. 0.5-50 Microns (mass median diameter)
Shipping Data:
L x W x H..................63 x 18 x 18 (In.) .............160.0 x 45.7 x 45.7 (Cm)
Weight.....................................73 Lbs. ........................................33.1 Kg.
Volume...............................11.8 Cu.Ft. ...................................0.33 cu. M.
4

TO THE NEW OWNER
Your new DYNA-FOG® applicator represents one of the world’s finest insecticide fog
generators. With reasonable care and maintenance, this machine will provide many hours of
trouble-free service. For best results, this fog generator must be operated and maintained in
compliance with these instructions.
CORRESPONCENCE
In all correspondence concerning the customer’s machine and in ordering parts, the
customer must refer to the model and serial numbers of this machine. This information is found on
the nameplate attached to the machine.
DESCRIPTION
This fog generator employs the resonant pulse principle to generate hot gases flowing at
high velocity. The high velocity gases atomize the formulation instantly so that it is vaporized and
condensed rapidly causing negligible formulation breakdown. The fog particle size is readily
controllable from approximately 0.5 to 50 microns and greater. The smaller particle sizes
correspond to the lower formulation flow rates and the larger particle sizes correspond to the higher
formulation flow rates. This machine is intended for outdoor use and for enclosed spaces with
volumes of more than 500 cubic feet (14 cubic meters). Use in more confined spaces may create a
fire or explosion hazard.
WORKING PRINCIPLE
The engine is essentially a tube with a combustion chamber, an intake valve, and a supply of
combustible mixture of fuel and air. To begin, a negative pressure is created in the fuel tank by
depressing a flexible priming bulb. This draws the fuel into the priming bulb, which is then forced
into the antechamber and combustion chamber, where it is ignited by the spark plug. An explosion
occurs in the combustion chamber driving the gases out the engine tube. The negative pressure
created by the gas flow out the engine tube causes the intake valves to open, allowing more air to
pass through the venture of the carburetor. The air passing through the carburetor aspirates fuel
from the carburetor in a combustible mixture. This mixture is ignited again and the cycle is repeated.
The frequency of repeated explosions is many times per second.
The initial source of ignition is a spark plug powered by an electronic ignition system. After
original ignition, the repeated cycles are sustained by a glow coil which is an integral and
inseparable part of the engine tube assembly. A sample of the pressure pulses from the combustion
chamber is routed to the carburetor where it operates a diaphragm fuel pump within the carburetor
to pump additional fuel from the fuel tank to the carburetor. When the fuel pump operation has
stabilized, further operation of the priming pump is not required.
The exhaust emission of a pulse jet engine is low in pollutant components due to the
following basic design features: The combustion chamber and the length of the discharge (exhaust)
tube attached to it operate at a bright red temperature approximating 1800○F., (982○C.). In addition,
an amount of air (oxygen) in excess of that required for normal burning of fuel vapor is fed to the engine.
Thus, combustion is quite complete and pollutants formed in other types of engines are actually burned to their
non-pollutant end products in the pulse jet engine.
The formulation remains in the formulation tank under pressure until the formulation valve is opened.
Then, the formulation is forced from the tank and delivered to the engine tube where it is injected
into the high velocity pulsating flow of hot gases. The formulation is broken into small particles by
the pulsating gases, and then discharged into the atmosphere.
5

SAFETY PRECAUTIONS
WARNING
READ AND UNDERSTAND THESE SAFETY PRECAUTIONS BEFORE OPERATING MACHINE.
1. Fuel. This machine uses GASOLINE as the fuel and all precautions commonly applying
to this volatile fuel should be observed. Be careful not to spill gasoline over the machine, but if this
occurs, wipe it off and allow evaporation time before starting the machine. GASOLINE ON THE
MACHINE OR SPILLED IN THE IMMEDIATE AREA IS HAZARDOUS. DO NOT ATTEMPT TO
PUT THE FUEL IN A HOT MACHINE.
2. Fogging Formulations: (Model 2620) All thermal fogging formulations are
combustible, that is, they all can be caused to burn. This is true, even of high flash point or “no”
flash point formulations. A combustible liquid vapor can be ignited because it readily forms a
uniform mixture with the air which contains the oxygen needed for combustion. However, fine
particles of combustible liquids or solids suspended in the air very closely spaced are capable of
propagating flame from one to another once ignition starts. A good analogy is the grain mill
explosion. Although the fine particle dust in a grain mill has “no” flash point, the phenomena of the
grain mill explosion is an all too common occurrence. While a high flashpoint or a “no” flashpoint
liquid formulation will ignite far less readily than a low flashpoint liquid, and for this reason is strongly
advocated, the high or “no” flashpoint formulation can ignite if the proper conditions exist. These
conditions are basically two: 1) a sufficient volume of liquid in the form of fine particles suspended in
the air; and 2) a sufficiently high energy source of ignition.
It is important to always employ a dry fog setting in a closed area to avoid depositing oil
particles on combustible surfaces, thus creating a fire hazard. If a combustible atmosphere is
established or a combustible deposit is laid down, a source of ignition may cause a fire. Even in
open areas, care should be taken to avoid unnecessary accumulations of oil particles on objects
within the fogging area. To avoid danger of fire or explosion in a closed space, the enclosed
volume, fogging time and required formulation volume must be carefully calculated.
(Model 2630). This machine is intended for dispensing water based formulations only. Use
of formulations having a flammable base such as diesel oil, kerosene, fuel oil, gasoline, benzene, or
alcohol, may create hazardous conditions leading to a fire or explosion.
3. Fog Concentration. It has been fully established that an acceptable level of liquid in the
atmosphere is one gallon (3.8 liters) for each 50,000 cubic feet (1400 cubic meters). There is a
margin of safety of at least 5 to 1 in this figure. But, long before this concentration is reached, with
the fine white particle fog that this machine generates, visibility within the fog is reduced to less than
15 inches (38 CM). Thus, an operator fogging within a closed area will not be able to see his way
long before combustible atmosphere can be approached. However, if the operator is outside of the
closed area, it is quite possible to over-fog, particularly if the area is small, i.e., crawl spaces under
buildings or between ceiling and roof.
4. Fog Ignition. The greatest hazard of fog ignition is from an external source. This can be
gas or oil pilot lights or sparks from electrical controls such as switches, relays, etc. Therefore, it is
strongly recommended that all such sources be eliminated by extinguishing all pilot lights and
turning off all electrical power before fogging.
The design of the machine is such that it is quite difficult to ignite the fog from an external
source since the ignition must be positioned just at the proper distance from the discharge end to
cause fog ignition and this distance is on the order of only 8-6 inches (7.6-5.2 CM). If an external
source ignites the fog being discharged, it will produce a torching effect. Should this occur, quickly
rotate the 30way selector valve to the purge position to stop the fog discharge. Never artificially
wedge or block open the formulation automatic shut-off valve on the model 2620 Blackhawk.
6

On a dry fog setting, which must always be employed indoors and in confined areas, the ignition
source must be continuous since the fog will not continue torching except briefly if the ignition source
is removed. On a wet fog setting, it is possible for the fog to continue to torch after removal form the
ignition source. Never use a wet fog setting indoors and in confined spaces. Extreme caution must
be exercised when using a wet fog setting under any circumstances. A wet fog setting can leave a
deposit of liquid on combustible surfaces creating a fire hazard should torching take place.
A second source of fog ignition can be the machine itself. If the machine stops running for
any reason, including the exhaustion of fuel, the operator must quickly rotate the 3-way valve to the
purge position to stop the fog discharge. If the engine stops, it is possible for some formulation to
flow into the still hot engine tube where it will vaporize. Part of this vapor may then be drawn by
natural thermal convection back through the annular cooling air space between the cooling duct and
the engine tube, to the red hot engine combustion chamber. If the proportion of vapor to air is just
right when this occurs, the vapor will ignite and flash back through the discharge end of the engine
tube, igniting the small amount of formulation which may continue to flow very briefly. Burning
formulation can then drip briefly from the discharge end of the cooling air duct. If this burning
formulation comes into contact with an easily combustible material or a surface which has
accumulated a substantial deposit of liquid formulation, a fire could result.
5. Safety Equipment. Many of the formulations which can be dispensed with this machine
are highly toxic and require special safety equipment. The formulation label should specify all safety
precautions with respect to the formulation. Read and observe the procedures, cautions and
WARNINGS on the formulation label. Proper ear protection should also be worn when operating this
machine.
6. Improper Operation. There is no substitute for good maintenance practices. An engine
with excessive carbon deposits will run weakly and is likely to stop at any time. A weak running
engine will also emit extremely wet fog at lower rates of formulation flow and this can result in
surfaces rapidly becoming coated with the formulation, and thus help to feed a fire if ignition takes
place as described above. Refer to the MAINTENANCE section for cleaning instructions.
7. Improper Use. Never place the discharge end too close to a wall or other obstruction.
The engine is maintained at the proper temperature by cooling air aspirated (pumped) by hot gases
flowing out the discharge (exhaust) end of the engine. If this cooling air flow is prevented, the
machine will overheat and it can suffer permanent damage which could result in an explosion or fire.
Maintain at least 24 inches (61 CM) clearance between the engine discharge (exhaust) and external
objects.
8. Machine Damage. Never operate a machine after it has been damaged. A damaged
machine can be a fire hazard.
9. Wind. Fogging during windy conditions is not usually practical because the formulation
will drift out of the intended area. However, under no circumstances should fogging INTO the wind
be attempted. Should the machine stop running for any reason, and a wind gust force vaporized
formulation back against the hot combustion chamber, it could ignite and flash back causing
momentary flaming from the discharge (exhaust) end of the machine.
10. Children. Many fogging operations are performed in residential areas commonly at dusk.
This presents the operator with the problem of children who are attracted to the fog. Children have
been observed running into and riding bicycles through the fog. Once in the fog, they cannot see or
be seen. In some reported instances, a child has been injured by running into an object obscured by
the fog. Also there is a possibility of fire should the machine briefly flame or become ignited from an
external source. Still another possible hazard lies in the toxic effect of the formulation, the severity of
which depends upon the chemical used, fog density, and the length of time of direct exposure.
IT IS THE OPERATOR’S RESPONSIBILITY TO DISCOURAGE ANYONE FROM PLAYING IN
THE FOG.
7

OPERATION
CAUTION
Read this compete OPERATION Section and the Section on SAFETY PRECAUTIONS before
starting the machine for the first time.
PREPARING THE ENGINE FOR OPERATION
1. When operating this machine for the first time, move to an un-congested and well-ventilated work
area in an open area away from flammable materials. Place the machine on a concrete pad or a
stable workbench.
2. Remove Fuel Tank Cap and fill the fuel Tank with either regular or unleaded gasoline.
CAUTION
Gasoline with a minimum of 87 Octane should be used. Use clean gasoline. Dirty gasoline
can promptly overload the fuel filter. Water in the gasoline can cause unexplained stops.
Very old or stale gasoline has a detrimental effect on the rubber seals in the fuel system and
causes hard starting because it vaporizes poorly.
3. Place the Fuel Tank Cap on the fuel Tank and turn the cap firmly in the clockwise (CW) direction
until the stop is reached.
4. Wipe any spilled gasoline from the machine and allow time for any unseen spills to evaporate.
CAUTION
Do not put any formulation in the machine until you have become familiar with starting and
stopping the pulse jet engine.
ENGINE OPERATION
CAUTION
Read the complete OPERATION section and the section on SAFETY PRECAUTIONS before
operating the engine.
NOTE
Abbreviated starting and clearing procedures are shown on the instruction label attached to the
machine; however, these should be used as reference only after you are thoroughly familiar with the
procedures. CAUTIONS and WARNINGS contained in this manual.
These instructions are intended to be used only as an approximate guide for starting the pulse jet
engine. Your starting procedure may vary slightly, depending on the density of the air where you are
starting your engine. Altitude, atmospheric pressure, and temperature all interact to affect air
density.
8

NOTE
The method used for starting the engine will vary slightly depending on previous conditions of
the machine. Regardless of which of the following conditions exist, the ignition switch must
be depressed to restart the engine.
DRY START: (Applies when the machine is first placed in service; when the machine has
been allowed to run completely out of fuel; or, when the machine has not been in recent use). When
starting from the dry condition (all fuel drained, consumed or evaporated from the carburetor),
additional actuation of the priming pump will be required to move fuel from the tank to the primer
bulb.
COLD START: (Applies after the engine has been started initially; has been stopped before
running out of fuel; and has been allowed to cool). Under these conditions, very little actuation of the
priming pump is required, as some fuel will usually remain in the carburetor. One actuation of the
priming pump is usually sufficient under these conditions.
HOT START: (Applies after the engine has been started initially; has been stopped before
running out of fuel, and has not been allowed to cool before restarting). Under these conditions,
actuating the priming pump is not usually required as some fuel will usually remain in the
antechamber.
FLOODED START: (Applies after too much fuel has reached the antechamber by excessive
operation of the priming pump). See section on STARTING A FLOODED ENGINE.
FIGURE 1
9

STARTING THE ENGINE
1. Verify that the 3-way valve has been rotated to the purge position.
2. Lift the ON/OFF Control and place it in the “ON” position.
WARNING
DO NOT LEAVE THE MACHINE UNATTENDED WITH THE ON/OFF CONTROL IN THE ON
POSITION, ESPECIALLY IF THE MACHINE HAS BEEN RUNNING. IF THE ENGINE IS HOT AND
THE ON-OFF CONTROL IS IN THE ON POSITION, THE MACHINE MAY SELF-START.
3. Press and hold the Ignition Switch and listen for the audible buzzing or clicking sound of the
Electronic Ignition firing the Spark Plug.
4. Depress and release the “Primer Bulb” repeatedly until the fuel is visible in the Bulb. Once fuel
reaches the Bulb, depress and release the Bulb (3) times for a “cold engine”, (1) time for restarting a
“hot engine”. (See Page 9 for starting conditions.)
CAUTION
Excessively depressing the primer bulb will flood the engine.
WARNING
FLOODING MAY RESULT IN A LOUD EXPLOSIVE SOUND AND CAUSE SOME SMALL
AMOUNT OF FLAME TO BE EMITTED FROM THE DISCHARGE (EXHAUST) END OF THE
ENGINE.
CAUTION
If flame emits from the discharge (exhaust) end of the engine tube, the engine is flooded.
STOP. See the following page on STARTING A FLOODED ENGINE.
5. Simultaneously press and hold the Ignition and Air Switches until the Engine begins to start.
6. Once the engine starts, release the Air Switch and continue depressing the Ignition Switch, until
the Engine runs smoothly.
If the Engine has not started within approximately 40 seconds, repeat steps 4,5,6.
If the Engine does not start, and the sound of the Electronic Ignition is not heard, release the
IGNITION SWITCH and proceed to the TROUBLE SHOOTING section of the manual.
NOTE
“Flooded”, means that the fuel-air mixture around the spark plug has become too rich (too much
fuel for the amount of air available) to ignite.
10

STARTING A FLOODED ENGINE
1. Verify that the 3-way selector valve has been rotated to the purge position.
2. Lift the ON-OFF Control and place it in the ON position.
3. Simultaneously depress the “ignition” and “air’ switches.
4. If the engine has not started within approximately 40 seconds, repeat steps 4,5, and 6 of starting
instructions on page 10.
STOPPING THE ENGINE
1. To stop the engine, lift the ON-OFF Control and place it in the OFF position.
SELECTING A FORMULATION
(MODEL 2620)
Thermal fogging is an efficient and economical non-residual method of controlling insects.
But, the fog machine cannot do the job alone. The proper insecticide, properly formulated is
absolutely necessary. The machine will accept ineffective, poorly compounded solutions and the fog
will appear no different from an efficient and well-formulated compound, but the killing power will be
lacking. It requires insecticide to kill insects.
Improperly compounded formulations can promptly drop out of solution in the formulation
system and give poor results. Your distributor is usually qualified to make recommendations and to
furnish properly formulated insecticides; but, if you have any specific questions or doubts, feel free to
contact the factory.
CAUTION
Use only formulations prepared for thermal fogging and for the specific job to be
accomplished. This information should be found on the formulation label.
WARNING
THIS DEVICE IS DESIGNED TO DISPENSE CHEMICAL SOLUTIONS IN A FOG. MOST
OF THE CHEMICAL SOLUTIONS WHICH MAY BE DISPENSED WITH THIS MACHINE REQUIRE
REGISTRATION WITH OR APPROVAL BY VARIOUS GOVERNMENT AGENCIES. USE OF
SOME OF THESE SOLUTIONS MAY BE RESTRICTED, REGULATED, OR PROHIBITED IN
CERTAIN AREAS.
11

FOGGING FOR INSECT CONTROL
CAUTION
Before placing any formulation in the Formulation Tank, the operator should be thoroughly
familiar with starting and stopping the pulse jet engine. If you are operating the machine for
the first time, start and stop the engine a few times. This is also a good idea for experienced
operators who may be operating a new machine or who may be reactivating an old machine
after repairs or after a period of inactivity. Refer to the appropriate sections for starting and
stopping instructions.
WARNING
READ THE SECTION ON SAFETY PRECAUTIONS BEFORE PREPARING TO DISPENSE FOG.
READ AND THOROUGHLY UNDERSTAND ALL INFORMATION, CAUTIONS AND WRNINGS
ON THE FORMULATION LABEL WHICH MAY AFFECT PERSONAL SAFETY. KNOW ANY
DANGERS OF THE SOLUTION USED AND KNOW WHAT TO DO IN CASE OF AN ACCIDENT
INVOLVING THE SOLUTION.
ALWAYS USE THE APPROPRIATE SAFETY EQUIPMENT AND DRESS ACCORDING TO THE
CHEMCIAL FORMULATION WHICH IS BEING USED.
SELECTING A FORMULATION
(MODEL 2630)
OBSERVE AND FOLLOW ALL CAUTIONS AND WARNINGS LISTED ABOVE.
The 2630 is designed to dispense liquids and mixtures of a nonflammable nature. See
CAUTIONS and WARNINGS on the machine in this Manual.
When beginning to fog with the 2630, liquids or mixtures of liquid and powder are forced to
the injection point by air pressure in the Formulation Tank.
At the injection point, the liquid is sprayed at a right angle to the flow of air from the Pulse Jet
Engine. As the liquid emerges from the Spray Tube, it is sheared into droplets by the air flow.
These droplets are further reduced in size by shock waves created by explosions and the turbulent
air-flow.
Since the liquid is exposed to the heat of the engine for a very short period of time, no
significant damage is done to the powders or chemicals suspended in the liquid carrier.
It is important that wettable powder mixtures be applied as soon after mixing as practical to
avoid powders settling out of suspension and causing clogging of the formulation system. The
tendency of wettable powders to settle out may be decreased by use of an appropriate additive.
Consult your formulation distributor or the formulation label concerning the availability of additives for
the particular active ingredient in the mixture you intend to use.
It is a good idea to put only as much formulation in the tank as is necessary to do a particular
job. Thus, the Formulation Tank will be empty when the job is finished. Leaving formulation
mixtures in the tank can lead to clogging of lines and orifices.
12

CALCULATING FOGGING TIME AND
FORMULATION VOLUME USING YOUR
MODEL 2620 BLACKHAWK
FOGGING WITHIN ENCLOSED SPACES:
When intending to fog within enclosed spaces such as buildings, crawl spaces, and spaces
between ceiling and roof, “dry” fog must be used. The enclosed space volume, formulation volume,
and fogging time must be carefully calculated to avoid over-fogging.
Volume formulas for simple shapes usually found in structures are shown below:
V = L x W x H V= L x W x H
2
BEFORE FOGGING:
1. Determine the volume of the enclosed space to be fogged in cubic feet or cubic meters, as
applicable.
Read the formulation label and determine the normal usage rate of the formulation. This usually
varies from 1 fluid ounce (oz.) per 1000 cubic feet, (approximately 100 milliliters per 100 cubic meters)
to 1 ounce per 3000 cubic feet (approximately 100 milliliters per 300 cubic meters).
2. Determine the Formulation Volume.
3. Determine the fogging time.
NOTE
Tables 1 and 2 are provided as a quick reference for determining fogging time. As a “rule of
thumb”, the operator must maintain at least fifteen (15) feet of clearance between the discharge
end of the machine and the target being fogged.
13

Example: (Using English System Units)
STEP 1: Let’s assume the attic space on the previous page has a base (W) of 26 feet, and a height
(H) of 7 feet and a length (L) of 43 feet. The volume (V) may be determined as:
V=26 x 7 x 43 = 3913 = 3900 cubic feet
2
Let’s also assume that the formulation label specifies a normal usage rate of 1 ounce per
3000 cubic feet. (Table 2)
Knowing the usage rate from the formulation label and the volume of space to be fogged, the
formulation volume and fogging time can be calculated as shown below.
STEP #2: The normal required formulation volume is:
1.3 ounces
(3900 cu. ft.) x (1 oz.) =
3000 cu. ft.
STEP #3 The normal time to fog 1.3 ounces is:
Where t = normal time to fog,
and 10 oz. is the average
machine flow-rate to achieve
a “dry fog”.
(1.3 oz.) x (10 oz.)
(t seconds) (60 seconds)
t seconds = (60 seconds) (1.3 oz.) = 8 seconds
10 oz.
FOGGING OUTDOORS: Read and follow all cautions and warnings for “Dispensing Fog” on pages
13 and 14. Read and follow the instructions for thermal fogging on the chemical solution label.
14

THESE TABLES APPLY TO THE MODEL 2620 ONLY:
ENCLOSED SPACE VOLUME VS FORMULATION VOLUME AND FOGGING TIME
Based on formulation label application rate of: 1 fluid ounce (oz) per 1000 cubic feet (cu. Ft)
100 milliliters (ml) per 100 cubic meters (cu. m)
Volume of Enclosed Space
Cu. Ft (Cu. meters)
1000 ( 30)
2000 ( 60)
3000 ( 90)
5000 ( 140)
10000 ( 280)
20000 ( 560)
30000 ( 840)
40000 (1120)
50000 (1400)
Average Flow Rate* to
achieve “DRY”
Fog Oz/Min(MI/Min)
10 (296)
10 (296)
10 (296)
10 (296)
10 (296)
10 (296)
10 (296)
10 (296)
Fogging Time
(Seconds)
6
12
18
30
60
120
180
240
300
TABLE 1
ENCLOSED SPACE VLUME VS FORMULATION VOLUME AND FOGGING TIME
Based on formulation label application rate of: 1 fluid ounce (oz) per 3000 cubic feet (cu. ft.)
100 milliliters (ml) per 300 cubic meters (cu. m)
Volume of Enclosed Space
Cu. Ft (Cu. meters)
1000 ( 30)
2000 ( 60)
3000 ( 90)
5000 ( 140)
10000 ( 280)
20000 ( 560)
30000 ( 840)
40000 (1120)
50000 (1400)
Average Flow Rate* to
achieve “DRY”
Fog Oz/Min (MI/Min)
10 (296)
10 (296)
11 (296)
11 (296)
11 (296)
11 (296)
10 (296)
10 (296)
Fogging Time
(Seconds)
2
4
6
10
20
40
60
80
100
TABLE 2
*This flow rate is an average. Your actual flow rate required to produce a “dry” fog may vary depending
on: the viscosity of the formulation to be fogged, the formulation tank pressure, and the operating
characteristic of the engine. A “dry” fog must be used when fogging in an enclosed are. See “Dispensing
FOG WARNING” on page 16. to test the fog to verify that it is “dry”, see “Caution” on page 17.
WARNING
IF YOUR FLOW RATE REQUIRED TO ACHIEVE A “DRY” FOG IS GREATER OR LESS
THAN THE AVERAGE FLOW RATE GIVEN IN THE TABLES 1 AND 2, FOGGING TIME
FOR THE ENCLOSED SPACE WILL BE DIFFERENT THAN THE TIME SHOWN. (SEE
STEP 3 ON PREVIOUS PAGE TO DETERMINE FOGGING TIME.)
15

DISPENSING FOG
Model 2620 Blackhawk and Model 2630 Mister III
NOTE
It is a good idea to put only as much formulation in the tank as is necessary to do a particular job. Thus, the
formulation tank will be empty when the fogging job is finished.
The Formulation Tank must be air tight for the machine to operate properly.
WARNING
READ THE ENTIRE OPERATION SECTION AND THE SECTION ON SAFETY PRECAUTIONS
BEFORE STARTING THE MACHINE FOR THE PURPOSE OF DISPENSING FOG.
DO NOT USE ANY SUBSTANCES FROM UNMARKED CONTAINERS OR FROM CONTAINERS
WITH OBVIOUSLY ALTERED LABELS.
READ AND FOLLOW THE INSTRUCTIONS ON THE CHEMICAL SOLUTION LABEL FOR
THERMAL FOGGING OF THE SOLUTION.
DO NOT, UNDER ANY CIRCUMSTANCES, USE A WET FOG IN A CLOSED AREA.
DO NOT FOG ANY ENCLOSED SPACE OF LESS THAN 500 CUBIC FEET (14 CUBIC METERS)
WITH THIS MACHINE.
DO NOT FOG AN ENCLOSED SPACE FOR MORE THAN (4) SECONDS FOR EACH 1000 CUBIC
FEET (28 CUBIC METERS) OF ENCLOSED SPACE WITH YOUR MACHINE SET AT MAXIMUM
OUTPUT. (MODEL 2620 ONLY.)
EXTINGUISH ALL OIL AND GAS PILOT LIGHTS AND TURN OFF ALL ELECTRICAL POWER IN
A CLOSED AREA BEFORE FOGGING.
DO NOT FOG NEAR AN OPEN FLAME OR HOT MATERIALS. THIS INCLUDES LIGHTED
MATCHES, CIGARETTES, ETC.
DO NOT WEDGE OR BLOCK OPEN THE FORMULATION ON-OFF BUTTON OR LEAVE THE
MACHINE UNATTENDED.
IF THE ENGINE STOPS FOR ANY REASON, ROTATE THE 3-WAY VALVE TO THE PURGE
POSITION.
IF AN EXTERNAL SOURCE IGNITES OR TORCHES THE FOG, ROTATE THE 3-WAY VALVE TO
THE PURGE POSITION.
DO NOT, AT ANY TIME, PLACE THE MACHINE ON ITS SIDE.
DO NOT PLACE THE DISCHARGE (EXHAUST) END OF AN OPERATING MACHINE CLOSER
THAN 24 INCHES (61 CM) TO A WALL OR OTHER OBSTRUCTION. THIS CAN CAUSE THE
ENGINE TO OVERHEAT AND CAUSE THE MACHINE TO SUFFER PERMANENT DAMAGE,
LEADING TO A FIRE OR EXPLOSION.
DO NOT TOUCH THE HOT ENGINE TUBE. ALLOW SUFFICIENT COOLING-TIME AFTER
OPERATION, BEFORE ATTEMPTING ADJUSTMENT, REPAIR, OR MAINTENANCE.
DO NOT LOOK INTO THE ENGINE DISCHARGE (EXHAUST) TUBE.
16

DO NOT FOG INTO THE WIND.
DO NOT LEAVE THE FOG CONTINUOUSLY DIRECTED AT THE SAME AREA OR OBJECT.
THIS MAY CAUSE A BUILD-UP OF A FLAMMABLE SUBSTANCE OR LEAVE UNDESIRABLE
DEPOSITS ON WALLS, FURNITURE, ETC.
The formulation output of your machine is controlled by the injection orifice you choose to install at
the injection point of the engine tube. The model 2620 Blackhawk is shipped with 4 different orifices
and the model 2630 Mister III is shipped with five. The “orifice number” is stamped on the side of
each orifice body and the approximate flow rates for each orifice size are shown in the table below:
TABLE 3
NOTE
The above flow rates are considered an average and may vary depending on: the viscosity of the
formulation to be fogged, the formulation tank pressure, and the operating characteristics of the
engine. These flow rates are based on a formulation having the same viscosity as ordinary tap
water. (1 centipoise)
CAUTION
When it is intended to fog in a closed area, the operator should first test the fog to verify that
it is dry, before entering the closed area. To test the fog quality, pass a dark piece of paper
or a shiny object through the fog at a distance of approximately 24 inches (61 CM) from the
discharge (exhaust) end of the machine. If there is any visual accumulation on the paper or
object, the fog must be considered wet and the formulation metering orifice changed to a
smaller size. Give yourself a margin of safety in selecting the formulation output orifice for a
dry setting.
2620
2630
86610-39 (Dry Fog)
86610-60
86610-79
441789 none*
86700-39
86700-49*
86700-60
86700-79
63054 none
Model Orifice Part Number Flow Rate gph (lt./hr.)
5 (18.9)
9.5 (36)
13 (49.2)
18 (68.1)
2.5 (9.6)
4.1 (15.5)
5.7 (21.6)
8.7 (32.9)
12 (45.4)
*Designates orifice number that is installed in machine at factory.
17

START FOGGING
1. Start the engine as specified in the section STARTING THE ENGINE.
2. Verify that the formulation Tank Cap is tight.
3. When the engine is running smooth:
Model 2620 – (1) Pull open the automatic shutoff - valve stem.
(2) Rotate the 3-way selector valve lever to the fog position.
Model 2630 – Rotate the 3-way selector valve lever to the fog position.
4. Once these conditions have been met, the fog can be started and stopped by rotating
the 3-way selector valve lever to the fog and purge positions.
As a safety feature, the model 2620 Blackhawk is equipped with an automatic formulation shut-off
valve. If the machine stops running for any reason, including running out of fuel, the shut-off valve
will instantly close, preventing formulation from being forced into the engine tube by the air pressure
in the formulation tank.
After fogging, always adjust the 3-way valve to the flush position. This will help prevent the
formulation line from clogging, and help prevent any formulation that may remain in the lines from
igniting and causing a fire.
18

MODEL 2620 & 2630 OPTIONAL FEATURE
As an additional feature, Curtis Dyna-Fog, Ltd. offers a kit that enables you to fog from a 30
or 55 U.S. gallon drum for large area fogging applications.
86739 Model 2630 Mister III
86708 Model 2620 Blackhawk
Kit Part Number Description
MODEL 2620 BLACKHAWK SHOWN CONNECTED TO A 55 GALLON DRUM
19

CLEANUP
1. Drain any unused Formulation from the tank into its original container for proper storage.
NOTE
Many formulations will release residue that can settle in the formulation tank. If this residue is left to
collect in the Formulation Tank, it will eventually be carried through the formulation system forming
sludge in the system. This sludge can completely block the formulation system making fogging
impossible.
CAUTION
Store all formulations where they are not accessible to children or other persons who may
not be aware of potential dangers involved.
Do not store formulations in unmarked or otherwise improper containers.
Do not re-use empty formulation containers for other purposes. Dispose of empty
formulation containers in accordance with the formulation label instructions.
Because the machine may still have gasoline in its tank, the machine should be stored
between uses under conditions applicable to gasoline containers generally, i.e., store in a
cool, dry, and well ventilated place away from sources of ignition.
2. After properly storing the formulation, perform the “AFTER EACH USE” maintenance operations
under the MAINTENANCE section of this manual.
3. If preparing the machine for a long-term storage or shipment, refer to the section marked
STORAGE AND SHIPMENT.
20