Hotsy 558-A Service manual

Read instructions carefully before attempting to assemble, install, operate or service this pressure
washer. Failure to comply with instructions could result in personal injury and/or property damage!
THE HOTSY CORPORATION
SERIAL NUMBER: 21 INVERNESS WAY EAST
ENGLEWOOD, CO 80112
[phone]
DATE PURCHASED:
FOR SALES AND SERVICE, PLEASE CONTACT:
OPERATING INSTRUCTIONS
AND PARTS MANUAL
NOTE: THIS MANUAL IS INTENDED FOR USE WITH
THE FOLLOWING MODEL RELEASE ONLY: 558-A AND 559-A
SPECIFICATIONS
● Pump Volume At Pump Head: 2.2 GPM/132 GPH
● Pump Pressure At Pump Head: 1300 PSI
● Burner Type:Model 558 - LP Gas Fired, 245,000 BTU
Model 559 - Natural Gas Fired, 240,000 BTU
● Machine Voltage: 115VAC/60Hz/1Ph
● Total Machine Amperage: 18 Amps
● Machine Weight: 275 Lbs.
● Shipping Weight: 310 Lbs.
● Exhaust Stack Size: 10”
● Machine Dimensions: Length = 28.5” , Width = 20”, Height = 31”
MODEL 558/559

Page2 Hotsy 558/559
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
Read and observe to prevent severe personal injury or property damage.
WARNING -When using this product basic precautions
should always be followed, including the following:
● Read all instructions before using this product.
● Know how to stop the product and bleed all pressures quickly.
Be thoroughly familiar with the controls.
● Toreducetherisk ofinjury,closesupervision isnecessarywhen
this product is used near children.
● Do not operate this product when fatigued or under the
influence of alcohol or drugs.
● STAY ALERT - watch what you are doing.
● Keep operating area clear of all persons.
● Ifequipped with a GFCI, testthe GFCI using the resetand test
procedures provided on the GFCI device.The GFCI must be
tested with every use.
● Follow the maintenance instructions specified in the manual.
WARNING - RISK OF EXPLOSION
● Do not spray flammable liquids or operate machine in areas
whereflammablevaporsare present.Operateonly where open
flame or torch is permitted.
WARNING - RISK OF ELECTROCUTION OR INJURY
● Disconnectpowersupply beforeperforming any maintenance.
Failure to do so could result in severe shock or unexpected
machine operation causing bodily injury.
● Make sure all switches and controls are in the OFF position
prior to connecting electrical supply.
● Donotstandinwaterwhile connecting and disconnecting elec-
trical supply.
● Keep all electrical components and connections dry and off
ground.
WARNING - RISK OF INJECTION OR SEVERE INJURY
● Keep clear of nozzle. Do not direct discharge stream at
persons. This machine is to be used only by qualified
operators.
AVERTISSEMENT:RISQUE D’INJECTION ET DE BLESSURES
GRAVES. SE TENIR ÀL’ÉCART DU JET. NE PAS DIRIGER LE JET DE
SORTIE VERS D’AUTRES PERSONNES.CONFIER L’UTILISATION DE
CE MATÉRIEL ÀUN OPÉRATEUR QUALIFIÉ.
● Use with eye, ear, hand, foot and skin protection at all times.
● Before changing or adjusting nozzle, engage manual
trigger gun lock.
CAUTION - RISK OF INJURY
● To reduce the RISK OF INJURY, read Operating Instruc-
tions carefully before using.
● Trigger gun kicks back, hold with both hands.
● Do not overreach or stand on unstable support. Keep good
footing and balance at all times.
● To prevent personal injuries due to falls, the use of auxiliary
safety equipment may be required.
● Hot discharge fluid.DO NOT touch or direct spray at persons.
● Hotsurfaces - Use onlydesignedgrippingareasoflance(wand
or trigger gun) and avoid contact with non-insulated areas of
machine to prevent the possibility of severe burns.
● Check hoses, fittings, wand, trigger gun and fuel connections
daily for signs of wear, cracks and looseness, and replace as
required.
● Do not block or tie trigger gun in the open position.
● Cleaning area should be provided with adequate drainage.
● Do not allow machine to run unattended.
CAUTION - RISK OF ASPHYXIATION
● Do not run machine indoors or in an enclosed area without
therequired venting,as exhaustfumesmaybe hazardous to
your health.
CAUTION
● The pilot on this machine lights automatically.Never attempt
to light the pilot or burner manually.
● Beforeoperatingthismachine,smell around the area forgas.
Be sure to smell next to the floor because some gases are
heavier than air and will settle to the floor. If you smell gas,
follow the procedure below:
1. Do not try to operate this machine or any other appliance.
2. Do not operate any electrical switches, and do not use the
phone in your building.
3. Immediately call your gas supplier from a phone off the pre-
mises. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire depart-
ment.
AVANT DE METTRE EN MARCHE CETTE MACHINE,VÉRIFIEZ QU’IL
N’Y A PAS DE FUITE DE GAZ ÀPROXIMITÉ. SENTEZ AU NIVEAU
DU SOL PARCE QUE CERTAINS GAZ SONT PLUS LOURDS ET
STAGNENT AU SOL. SI VOUS SENTEZ LE GAZ, SUIVEZ LES IN-
STRUCTIONS SUIVANTES:
1. NE PAS METTRE EN MARCHE CETTE MACHINE OU AUCUNE AU-
TRE MACHINE.
2. NE PAS ALLUMER LA LUMIÈRE OU UTILISER LE TÉLÉPHONE
DANS VOTRE BÂTIMENT.
3. APPELER IMMÉDIATEMENT LE SERVICE DE GAZ DEPUIS UN
TÉLÉPHONE HORS DE VOTRE BÂTIMENT. SUIVRE LES INSTRUC-
TIONS DONNÉES PAR VOTRE SERVICE DE GAZ.
4. SI VOUS NE POUVEZ PAS JOINDRE VOTRE SERVICE DE GAZ,
APPELEZ LES POMPIERS.
● When applying detergents follow the safety rules on the de-
tergent label.
● Useonlyapproveddetergentfromacovered,D.O.T.approved,
container.
● Troubleshootmachine beforepressinganyresetbuttons.See
Troubleshooting Guide.
● Failure to operate in accordance with operating manual may
be dangerous and will void warranty.
IMPORTANT
● This machine is not to be connected to type B gas vent.
NE PAS RACCORDER CET APPAREIL ÀUN TUYAU D’ÉVACUATION
DE GAZ DU TYPE B.
● A draft diverter shall be installed.
INSTALLER UNE HOTTE DE TIRAGE.
● This machine must be electrically grounded.
LA MACHINE DOIT ÊTRE MISE ÀLA TERRE.
● Connect this machine to an individual branch circuit only.
● If this machine is connected to a circuit protected by fuses,
use time delay fuses.
● Consult manual and local building codes for installation re-
quirements.Licensed contractor may be required.
● Contact an authorized service technician for repairs. Unau-
thorized machine modification or use of non-approved re-
placement parts may cause personal injury and/or property
damage and will void the manufacturer warranty.
● This machine has been provided with Warning and Instruc-
tion decals for the safety of the operator. If these decals are
removed or become damaged they should be replaced.

Page3Hotsy 558/559
Figure 1 - Machine Component Layout
WAND TRIGGER GUN
ADJUSTABLE
PRESSURE NOZZLE
PRESSURE
HOSE
PRESSURE
HOSE
ATTACHMENT
HOSE HANGER
PILOT IGNITOR
BUTTON
GAS ON/OFF KNOB
THERMOSTAT
RELIEF VALVE
PUMP
GARDEN HOSE CONNECTOR
DETERGENT INJECTOR VALVE
GAS BURNER
MOTOR
UNLOADER VALVE
PUMP SWITCH
BURNER SWITCH
COIL DRAIN PLUG
BURNER EXHAUST VENT
OPERATING INSTRUCTIONS
CAUTION
DETERGENTS
WARNING
CONTROL BOX
WAND
HOLDER
GFCI
POWER CORD
(GROUND FAULT
CIRCUIT
INTERRUPTER)
DETERGENT LINE
GAS INLET
GAS VALVE
PILOT INDICATOR LIGHT
MOTOR RESET SWITCH

Page4 Hotsy 558/559
Figure 2 - Hose Hanger Installation
ASSEMBLY
Unpacking
Unpack carefully. Wear safety glasses or goggles while
unpacking, assembling or operating pressure washer. If
there are missing components or hidden damage
immediately contact distributor or carrier concerning
discrepancies.
1. Cut strapping band from pressure washer and pallet.
2. Remove pressure washer from pallet.
Parts Included
•Pressure Washer
•Pressure Hose
•Hose Hanger
•Wand
•Parts Bag Containing:
■Adjustable Pressure Nozzle
■Garden Hose Connector
■Quick Disconnect
■Trigger Gun
■Garden Hose Connector Spring
■Quick Disconnect Plug
•Operating Instructions and Parts Manual
Tools Required
•10" Adjustable CrescentWrench (2 ea.)
•1/2”Allen Wrench
•Small Flat Head Screwdriver
Hose Hanger
1. Install the hose hanger as shown in Figure 2.
Figure 4 - Trigger Gun/Wand Assembly
HOSE HANGER
POCKET ON
COIL TANK
Figure 3 - Installing Pressure Hose
3. Assemble wand components as shown in Figure 4.
Connect pressure hose to trigger gun.
NOTE: The pressure nozzle is not to be installed at
this time.
4. Make sure that all plumbing connections are tight.
Garden Hose Connector
1. When assembling, use teflon tape on all plumbing
connections to prevent leakage.
2. Locate the garden hose connector and garden hose
connector spring from the parts bag.
3. Assemble the spring and connector to the detergent
injector as shown in Figure 11.
4. Make sure that all plumbing connections are tight.
Pressure Hose,Trigger Gun and Wand
1. When assembling, use teflon tape on all plumbing
connections to prevent leakage.
2. Install the pressure hose on the pressure washer as
shown in Figure 3.
RELIEF VALVE
PRESSURE HOSE
QUICK DISCONNECT
PLUG WAND
QUICK
DISCONNECT
TRIGGER GUN
PRESSURE HOSE

Page5Hotsy 558/559
INSTALLATION
Getting Started
IMPORTANT: Proper initial installation of equipment
will assure more satisfactory performance, longer
service life and lower maintenance cost.
IMPORTANT: The use of a backflow preventer on the
water supply hose is recommended and may be
required by local codes.
The pressure washer should be run on a level surface
where it is not readily influenced by outside sources
such as strong winds, freezing temperatures, rain, etc.
The pressure washer should be located to assure easy
access for filling of fluids, adjustments and maintenance.
Normal precautions should be taken by the operator to
prevent moisture from reaching the pressure washer. It
is recommended that a partition be made between the
washareaandthepressurewashertopreventdirect spray
fromthewandcomingincontactwiththe pressurewasher.
Moisture reaching the equipment will reduce the pres-
sure washer’s service life.All installations should comply
with the local codes covering such installations.
Venting
WARNING - RISK OF EXPLOSION:Do not spray flam-
mableliquidsor operate machinein areas whereflam-
mable vapors are present. Operate only where open
flame or torch is permitted.
CAUTION - RISK OF ASPHYXIATION: Do not run
machine indoors or in an enclosed area without the
required venting, as exhaust fumes may be hazard-
ous to your health.
CAUTION: Some gases are heavier than air and will
spill out on the floor in the 2 to 3 minutes required for
the safety pilot valve to close off gas supply. There-
fore, always provide adequate space and ventilation
around these units.
CAUTION: All venting must be in accordance with
applicable federal and state laws, and local ordi-
nances. Consult local heating contractors.
IMPORTANT:This machine is not to be connected to
a type B gas vent. NE PAS RACCORDER CET
APPAREIL À UNTUYAU D’ÉVACUATION DE GAZ DU
TYPE B.
IMPORTANT: A draft diverter shall be installed.
INSTALLER UNE HOTTE DE TIRAGE.
If the pressure washer is to be used in an enclosed area,
a flue must be installed to vent burner exhaust to the
outsideatmosphere.Exhaust gasesshould notbe vented
into a wall, a ceiling, or a concealed space of a building.
Be sure the flue is the same size as the burner exhaust
vent on the pressure washer. Poor draft will cause the
pressure washer to soot and not operate properly.When
selecting the location for installation, beware of poorly
ventilated locations or areas where exhaust fans may
causeaninsufficient supplyofoxygen.Propercombustion
can only be obtained when there is a sufficient supply of
oxygen available for the amount of fuel being burned.If it
is necessary to install the machine in a poorly ventilated
area,outside fresh airmayhave tobe piped tothe burner
and a fan installed to bring sufficient air into the machine.
Locate the pressure washer so that the flue will be as
straight as possible and protrude through the roof at a
properheight andlocation to provideadequate draft.This
gas fired pressure washer must have a draft diverter
installed in the flue (available from most heating
contractors). A draft diverter will permit proper upward
flow of exhaust flue gases.
Water Supply
Connectwatersupplyhose tothegarden hoseconnector.
See Figure 1 for location. The water faucet and supply
hose must be capable of providing a minimum of 2.2
gallons per minute (GPM).
Fuel Supply
CAUTION:Have a qualifiedgas serviceman install and
service your equipment.
WARNING:Gas line supply pressure must not exceed
14" water column (.50 PSI).
IMPORTANT: Gas line must be provided with a shut
off valve.
IMPORTANT:The gas supply must be able to supply
a minimum of 245,000 BTU/HR at the machines rated
manifold pressure.
Consult building codes for installation requirements.
For proper and safe machine operation, we recommend
that a licensed contractor be consulted for machine
installation.

Page6 Hotsy 558/559
LPVapor Fuel
The model 558 has been factory built to use LP vapor
fuel. DO NOT USE LIQUID FUEL.
Have a qualified gas serviceman install the LP vapor fuel
supply line to the machine. See Figure 5 for location of
gas inlet.
Natural Gas Fuel
The model 559 has been factory built to use natural gas
fuel.
Have a qualified gas serviceman install the natural gas
fuel supply line to the machine.See Figure 5 for location
of gas inlet.
Gas Regulator
It is very important that the incoming gas pressure
be between 12.0-14.0 Inches Water Column (.43-
.50 PSI). If your fuel supply does not produce the
correct pressure range contact your local Hotsy Service
Representative.
The gas pressure coming out of the regulator and going
to the burner ring has been factory set. You should not
readjust the burner ring gas pressure.If you replace your
gas valve, you will need to adjust the new valve. Refer
to your machine’s specification plate for the correct
pressure setting. Follow the installation and adjustment
instructions provided with your replacement valve.
Electrical
WARNING: Make sure all switches and controls
are in the OFF position prior to connecting electrical
supply.
WARNING: DO NOT stand in water while connecting
and disconnecting electrical supply.
WARNING: Always disconnect power before servic-
ing your pressure washer.
IMPORTANT: Consult local building codes for exact
electrical requirements.Licensed contractors may be
required.
IMPORTANT:All wiring must be of proper voltage and
amperage rating and conform to applicable codes.
IMPORTANT: This machine must be electrically
grounded. LA MACHINE DOIT ÊTRE MISE À LA
TERRE.
Grounding Instructions: Make sure all switches and
controls are in the OFF position prior to connecting
electrical supply. Do not stand in water while connecting
anddisconnectingelectricalsupply.Ifit shouldmalfunction
or break down, grounding provides a path of least
resistanceforelectric current toreduce theriskof electric
shock.The product must be connected to an appropriate
power source that is properly installed and grounded in
accordance with all local codes and ordinances.
DANGER: Improper connection of the equipment
grounding conductor can result in a risk of electro-
cution. Check with a qualified electrician or service
personnel if you are in doubt as to whether the
outlet is properly grounded. DO NOT modify the
plug provided with the product - if it will not fit the
outlet, have a proper outlet installed by a qualified
electrician.DO NOT use any type of adaptor with this
product.
WARNING:To reduce the risk of electrocution, keep
all connections dry and off the ground.DO NOT touch
plug with wet hands.
Figure5 - GasValve Components
PRESSURE TAP PORT
TO BURNER RING
SIDE VIEW
SELECTION BUTTON (OUT FOR NATURAL GAS)
FINE ADJUSTMENT
GAS VALVEGAS TEE
GAUGE
GAS INLET
MAIN ADJUSTMENT
ON/OFF KNOB

Page7Hotsy 558/559
Figure 6 - Nozzle Installation/Manual Trigger Lock
ADJUSTABLE
PRESSURE NOZZLE
MANUAL TRIGGER LOCK
OPERATION
Before Starting
1. Readallmanuals providedwiththis pressurewasher.
Become familiar with location and function of all
operating and safety controls.
GroundingInstructions:Thisproductmustbeelectrically
grounded. If it would malfunction or break down,
grounding provides a path of least resistance for electric
current to reduce the risk of electric shock.This machine
must be wired into an appropriate outlet that is properly
installedand groundedin accordancewith alllocal codes
and ordinances.
DANGER: Improper wiring connections of the equip-
ment can result in a risk of electrocution.Check with
a qualified electrician or service personnel if you are
indoubt as towhether the outlet is properly grounded.
WARNING: Make sure all switches and controls are
inthe OFF position prior topluggingin electrical cord.
WARNING: DO NOT stand in water while plugging or
unplugging electrical cord.
CAUTION: This pressure washer is equipped with a
UL approved ground fault circuit interrupter (GFCI)
power cord. Use UL grounded type receptacles of
proper voltage and amperage ratings. Where a prop-
erly grounded receptacle is not available, it is the
personal responsibility of the owner to have one
installed. Always disconnect power before servicing
your pressure washer.
CAUTION: This machine is equipped with a 35 foot
long power cord protected by a ground fault circuit
interrupter (GFCI). DO NOT use extension cords due
to possible severe electrical shock and/or damage to
the machine.
2. Connect electrical cord to an overload protected
115VAC/60Hz/1Phgroundedcircuit,minimum 18am-
pere rated. Test the GFCI using the reset and test
procedure located on the GFCI device. Do not use
machine if GFCI fails test. The GFCI must be reset
and tested with every use.
WARNING: Check hoses, fittings, wand, trigger gun
and fuel connections daily for signs of wear, cracks
and looseness, and replace as required.
3. Connect water supply hose to the garden hose con-
nector, see Figure 1 for location. The water faucet
andsupply hose mustbecapable ofprovidinga mini-
mum of 2.2 gallons per minute (GPM).
4. Thismachine wasfactory builtforeither LPvaporfuel
or Natural Gas.See instructions under Fuel Supply.
5. Check pump oil level.
6. If detergents are to be used, only use detergents
intended for pressure washers. Follow instructions
on the detergent container.
IMPORTANT:Before installing pressure nozzle on ini-
tial start-up, turn on the water supply, start the pump
by pressing the pump ON switch, and hold the trig-
ger gun trigger open until water appears at the end
of the wand. Allow water to run from the end of the
wand until clear to prevent the nozzle from clogging.
IMPORTANT: If the pressure washer has not been
used for an extended period of time,remove the pres-
sure nozzle from the end of the trigger gun and turn
on water supply, and start the pump by pressing the
pump ON switch. Hold the trigger gun trigger open
and allow water to run from the end of the wand until
clear.
7. Installtheadjustable pressurenozzle onendof wand,
refer to Figure 6.
NOTE:To prevent damage to the pressure nozzle,only
place the wrench on hex area when tightening.
IMPORTANT:The trigger gun provided with this pres-
sure washer is equipped with a manual trigger lock
to prevent accidental operation of the trigger gun,
refer to Figure 6. The trigger lock should be used
whenever the trigger gun is not in use.
IMPORTANT:Pump may require priming the first time
the pressure washer is run. See step 8.
8. If you are running the machine for the first time, or
the machine has been sitting for a period of time, the
pump may require priming. To prime the pump, run
pressure washer with only the pump switch on.
IMPORTANT:On initial start-up or if maintenance has
been performed on the burner assembly,it will be nec-
essary to bleed the air from the gas line before the
pilot will light.
9. Ifyouare runningthemachine for thefirsttime orhave
performed maintenanceto theburner assembly,there
will be air in the gas line.To bleed out the air from the
gas line, run pressure washer with pump and burner
switches ON and thermostat on highest setting.
Squeezethe triggerof the trigger gun for15 seconds.
If the burner has not ignited, release the trigger for 5
seconds then squeeze for 15 seconds. If the burner
has not ignited after 10 tries, see the Troubleshoot-
ing Guide in this manual.
CAUTION: Have a qualified gas serviceman install
and service your equipment.
DANGER: Never expose a spark or flame where there
may be unburned gas present.

Page8 Hotsy 558/559
DANGER: Some gases are heavier than air and will
spill out on the floor in the 2 to 3 minutes required for
the safety pilot valve to close off gas supply.There-
fore, always provide adequate space and ventilation
around these units.
To Start
WARNING: Risk of injection or severe injury - Keep
clear of nozzle - DO NOT direct discharge stream at
persons - This machine is to be used only by quali-
fied operators.
AVERTISSEMENT: RISQUE D’INJECTION ET DE
BLESSURES GRAVES. SE TENIR À L’ÉCART DU JET.
NEPAS DIRIGER LE JET DESORTIEVERS D’AUTRES
PERSONNES. CONFIER L’UTILISATION DE CE
MATÉRIEL À UN OPÉRATEUR QUALIFIÉ.
WARNING:Wear eye,ear,hand,foot,and skin protec-
tion at all times while operating pressure washer.
IMPORTANT:Thewater mustbeturned on beforestart-
ing. Running the pump dry will cause damage and
void warranty.
IMPORTANT: Do not allow the machine to run in
bypass for more than 10 minutes at any one time or
damage to pump may occur.
1. Connect electrical cord and test GFCI device.
2. Turn water on.
NOTE:The pilot indicator light on the control box will
ONLY indicate the presence of the pilot while the
machine is in operation. This light will be off when
the machine is not running.
NOTE: The pilot may require repeated attempts to
ignite following initial installation or replacement of
the natural gas supply.The delay in ignition is due to
trapped air in the gas supply/pilot line.
3. Open gas supply valve.
4. Turn the gas valve ON/OFF knob to pilot position.
5. Fully depress gas ON/OFF knob and hold in. Imme-
diately push the ignitor button down and repeat until
the pilot ignites. If the pilot fails to ignite within 30
seconds, release the gas control knob, depress
slightly and turn to the OFF position.Wait 15 minutes
and repeat steps 4 and 5.
6. Once pilot has ignited, continue to depress the gas
control knob for an additional 60 seconds before
releasing.
7. Turn gas control knob to the ON position.
8. Hold wand firmly, release trigger of trigger gun and
turn pump switch ON.Squeeze trigger of trigger gun
and allow air to purge from system.
9. If HOT water is desired, adjust the thermostat to the
proper temperature and turn burner switch ON.
Squeezetriggerof trigger gun.Thepilot willautomati-
cally light, quickly followed by the firing of the burner
ring.When thetrigger of the trigger gunis released or
when the thermostat temperature setting is reached,
the burner will automatically turn off.
IMPORTANT:If ignition or flame failure is experienced,
discontinue use of pressure washer at once.Turn off
burner and shut off fuel supply.Have cause of failure
corrected by an authorized service technician before
use of pressure washer is continued.
To Clean
WARNING: Risk of injection or severe injury - Keep
clear of nozzle - DO NOT direct discharge stream at
persons - This machine is to be used only by quali-
fied operators.
AVERTISSEMENT: RISQUE D’INJECTION ET DE
BLESSURES GRAVES. SE TENIR À L’ÉCART DU JET.
NEPAS DIRIGER LE JET DESORTIEVERS D’AUTRES
PERSONNES. CONFIER L’UTILISATION DE CE
MATÉRIEL À UN OPÉRATEUR QUALIFIÉ.
The detergent injector valve (Figure 11) operates by
reducing the volume of water, thus a vacuum is achieved
and detergent is drawn into the system.DO NOT reduce
the water inlet flow so the pump cavitates due to water
starvation. Operating a pump with insufficient water will
damage the pump seals.
1. Insert detergent line and screen into container of
detergent.
2. Completely open detergent control knob located on
the side of the detergent injector valve.
3. Start the detergent suction by rotating the water
adjustmentknob of thedetergent injector valve.Turn-
ing the knob counterclockwise will pull detergent into
the system. The flow may be observed through the
clear detergent line. Secure the knob position with
the knurled nut.
4. The side control knob can now be adjusted to meter
the desired amount of detergent.
5. Select the width of your nozzle spray pattern by turn-
ing the black knob on the nozzle.Pattern can be from
0°through 80°fan spray.
6. Wash from the bottom to the top, using side to side
motions.This washes away heavy dirt and allows the
detergent to soak as you work toward the top.
7. Do not wash at a 90oangle to the work (straight at it).
This will allow water to splash back at you and
reduces your cleaning power. Wash at a 30oto 60o
angle to the work.This will allow the water to splash
away from you and the water will wash the dirt away
faster and easier.
8. Use the width of the spray pattern to wash in a wide
path. Overlap spray paths for complete coverage.
Wash from side to side, using slow, steady motions.
9. The nozzle should be 12" to 24" from work, closer
for tough areas. Be careful on painted or delicate
surfaces, the pressure may damage surface if nozzle
is too close.

Page9Hotsy 558/559
Figure 7 - Pump Lubrication
OIL FILL/DIPSTICK SIGHT GLASS
OIL DRAIN
10. Small partsshould bewashedin abasketsothe pres-
sure does not push them away. Larger, light weight
parts should be clamped down so the pressure does
not push them away.
11. Turn the side detergent control knob clockwise (CW)
for detergent decrease. Wait for detergent to clear.
Always rinse with cold water after using detergent.
Rinse from the top to the bottom to prevent detergent
from dripping onto a rinsed area.For the best results,
contact your Hotsy dealer to help you select the best
detergent for your application.
To Stop
NOTE: If the machine is unplugged,the GFCI must be
reset prior to use. Always test GFCI before each use.
1. If detergents were used, draw clean water through
the detergent inlet line to purge detergent. Failure to
do so may clog detergent injector valve.
2. If burner was used, turn OFF burner switch and allow
pump to run cold water through coil for several
minutes.
3. Turn OFF pump switch.
4. Turn OFF water supply.
5. Squeezetrigger gunopen torelieve systempressure.
6. Depress gas control knob slightly and turn to OFF
position.
7. Turn off main shut-off valve on gas supply.
STORAGE
DANGER: Do not store flammable liquids (gasoline,
diesel fuel, petroleum, solvents, etc.) near pressure
washer or in non-ventilated areas.
1. Protect from freezing by storing in a heated area,
or by flushing the system with antifreeze (use an
automotive engine antifreeze or windshield washer
solvent to antifreeze). To flush the system with anti-
freeze, attach a short length of hose to the garden
hose connector, see Figure 1 for location. Place the
other end of the hose into a container of antifreeze.
Start machine and allow to run until antifreeze flows
from the end of the wand.Squeeze and release the
trigger gun several times to antifreeze the unloader
system. Also draw antifreeze through the detergent
inletlineto antifreezethedetergentsystem.Foradded
protectionafter antifreezing, disconnectthe pressure
hose from machine and remove the coil drain plug
(refer to Figure 1 for location).After coil has drained,
replacepressure hose andcoil drainplug.If thepres-
sure washer is not to be used for an extended length
oftime,it isrecommended thatthe system be flushed
with antifreeze for rust protection.
MAINTENANCE
WARNING: Unauthorized machine modification or
use of non-approved replacement parts may cause
personal injury and/or property damage and will void
the manufacturer warranty.
Pump
Lubrication: To lubricate pump, use 30W non-detergent
oilforpumpcrankcase.Crankcasemustbe filledto center
ofsight glasswindow found on the sideof thepump,refer
to Figure 7. During the break-in-period, make sure the
oil is changed after the first 25 hours of operation. After
that,replace oilevery 3 monthsor 300hours ofoperation,
whichever comes first.
Proper Pump Care
• DO NOT pump acids.
• DO NOT allow pump to run dry.
•Winterize if storing in freezing temperatures, refer
to Storage for details.
•Use a water softener on the water system if known
to be high in mineral content.
•Use only high quality detergents and follow manu-
facturer’s mix recommendations.
•Flush the system with clean water immediately
after using detergent solutions.
•Clean filter screen on detergent inlet line periodi-
cally.
•Flush the pressure washer system with antifreeze
if storing for an extended period of time, refer to
Storage for details.

Page10 Hotsy 558/559
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
NOTE: Some motors may be equipped with perma-
nently lubricated bearings and will not require addi-
tional lubrication.
Gas Burner
Itis recommended that the gasburnerbe servicedyearly
or as needed. Contact your local service center.
Relief Valve
WARNING:The relief valve on this pressure washer
has been factory set and sealed and is a field nonad-
justable part.Tampering with the factory setting may
cause personal injury and/or property damage, and
will void the manufacturer warranty. For replacement
parts refer to Figure 16.
UnloaderValve
WARNING: The unloader valve on this pressure
washer has been factory set and sealed and is a field
nonadjustable part. Tampering with the factory set-
ting may cause personal injury and/or property dam-
age, and will void the manufacturer warranty. For
replacement parts refer to Figure 17.
Heating Coil:
Coil Descaling: In hardwaterareas,scale buildupwithin
the heating coil will occur. Scale deposits will decrease
the water temperature rise and may eventually clog the
heating coil. Contact your local service center when
descaling is needed.
Coil Desooting: Poor grades of fuel or inadequate
combustion air will cause heavy soot buildup on the
outside surface of the heating coil. These deposits will
insulate the coil.This will restrict the air flow through the
coil, further aggravating the soot buildup. Contact your
local service center when desooting is needed.

Page11Hotsy 558/559
TROUBLESHOOTING GUIDE
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
Pump motor will not
run. GFCI tripped. Reset and test GFCI with every use. See symptom "GFCI tripped" on
page 12 Troubleshooting Guide.
No voltage to machine. Test power supply and correct.
Pump motor reset button (thermal
overload protector) tripped. Push reset button on control box. If tripped check for proper voltage or
clogged pressure nozzle.
Excessive pressure due to clogged
relief valve. Clean relief valve seat.
No water sprays from
pressure nozzle. Pressure nozzle completely clogged. Clean pressure nozzle.
Inlet water screen clogged. Check screen and clean if necessary.
Pump sucking air. Fill the detergent container and check
for loose hose clamps or fittings.
Low pressure from
pressure nozzle. Inlet water screen clogged. Check screen and clean if necessary.
Pressure nozzle worn or incorrect
size. Replace nozzle with proper size.
Water supply low. Correct water supply.
Pump sucking air. Fill the detergent container and check
for loose hose clamps or fittings.
Poor or no detergent
flow. Low detergent level. Fill the detergent container.
Detergent screen clogged. Clean if necessary.
Detergent injector valve not
opening. Check that handle or knob is not slip- ping on shaft.
Pressure nozzle clogged. Clean pressure nozzle.
Excessive inlet pressure (more than
80 PSI). Adjust detergent injector valve. See instructions under To Clean.
Pressure relief valve
leaking. Excessive pressure due to unloader valve over adjusted. Call qualified serviceman to adjust or replace unloader valve.
Defective relief valve. Replace relief valve.
Burner will not ignite
when trigger gun is
open.
Defective pressure switch. Replace pressure switch.
No gas. Check gas supply.
No pilot. Check that indicator light is on.
Thermostat set too low or defective. Raise thermostat setting. Replace if
defective.
Gas valve not open. After pilot light is on, turn gas valve
ON/OFF knob to ON position, then
turn burner switch on.

Page12 Hotsy 558/559
IMPORTANT
If the pressure washer demonstrates other symptoms or the corrective actions
listed do not correct the problem, contact the local authorized Hotsy Service
Center.The Hotsy Service Center can be identified by contacting:
Customer Service Department
The Hotsy Corporation
21 InvernessWay East •Englewood, Colorado 80112
[phone]
TROUBLESHOOTING GUIDE
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
Burner will not ignite
when trigger gun is
open.
...continued
Defective primary regulator. Replace regulator.
Defective gas valve. Replace gas valve.
Burner smokes or has
obnoxious odor. Stack restriction. See Venting under Installation.
Unloader cycles when
gun is open or closed. Air in system. Open and close gun several times.
Unloader out of adjustment or
defective. Call a qualified serviceman to adjust or replace unloader valve.
Water leak between unloader valve
and trigger gun. Check fittings, hose and trigger gun for leaks. Repair or replace.
Pilot does not light. Gas valve closed. Set gas valve ON/OFF knob to pilot.
Gas leak in pilot. Call qualified serviceman.
Pilot ignites but will not
stay on when ON/OFF
knob is released.
Pilot too far away from
thermocouple. Adjust thermocouple closer to flame.
Thermocouple loose at gas valve. Tighten to firm fit.
Short thermocouple life. Excessive heat from pilot flame. Decrease pilot supply gas.
Thermocouple too close to pilot. Adjust thermocouple farther away.
GFCI tripped. Device has not been reset. Follow instructions on GFCI.
Defective GFCI device. Replace.
Line to ground fault. Contact qualified electrician to
troubleshoot for ground fault.

Page13Hotsy 558/559
FOR HELP OR ADDITIONAL INFORMATION, CONTACT:
Customer Service Department
The Hotsy Corporation
21 Inverness Way East
Englewood, CO 80112
[phone]
When ordering from your dealer, please provide the following:
Model Number: ________________ Release:_______________
Machine Serial Number: ________________________________
Component Part Number:_______________________________
Description: __________________________________________

Page14 Hotsy 558/559
5
6
7
8
9
12
1110
13,14,15,16
17
4
3
2
1
Figure 8 - Machine Assembly, Side View
Ref. No. Part No. Description Qty.
1 375005 Chassis 1
2 232018 Decal Natural Gas Pressure (559) 1
232019 Decal LP Gas Pressure (558) 1
3 834159 Decal Hotsy Detergent 1
4Fig. 11 Water Inlet Assembly 1
5Fig. 12 Trigger Gun/Wand Assembly 1
6 824115 Vent Clip 4
7 861644 Hose Hanger 1
8 873777 Coil Insulation 1
Ref. No. Part No. Description Qty.
9 834385 Hotsy Logo 2
10 867207 Pressure Hose 1
11 825951 GFCI Power Cord 1
12 645922 Warnings Decal 1
13 691803 PilotIgnitor Button 1
14 798914 NutIgnitor Button 1
15 936603 EndIgnitor Wire 1
16 936604 SideIgnitor Wire 1
17 645921 Instructions Decal 1
WARNING
OPERATINGINSTRUCTIONS
CAUTION
DETERGENT

Page15Hotsy 558/559
Figure 9 - Machine Assembly,Top View
Ref. No. Part No. Description Qty.
1 815319 Snap Bushing 2
2 823932 MountingClip 1
3 ■ Bolt 1/4”- 20 x 3/4”2
4 333005 Front Chassis Panel 1
5 ■ Screw 1/4”- 20 x 1”8
6 ■ Flat Washer 1/4”8
7 826060 Strain Relief 1
8 824102 RetainingClip 1
9 834154 DecalWinterize 1
10 815329 Snap Bushing 2
Ref. No. Part No. Description Qty.
11 630609 Retaining Clip 1
12 ■ Flange Nut #10 - 24 2
13 ■ Screw #10 - 24 x 1/2”2
14 375030 Rear Chassis Panel 1
15 722418 Insulation 1
16 859806 Grommet (Wand Holder) 1
17 241536 Coil 1
18 444438 Decal Detergent Metering 1
19 444437 Decal Water Metering 1
■ Standard hardware item available locally.
9
14,15
5,6
16171018
19
1
2,3
1
4
5,6
78 10 11,12,13
WATER
WINTERIZE

Page16 Hotsy 558/559
Figure 10 - Machine Assembly, Front View
Ref. No. Part No. Description Qty.
1Fig. 14 Burner Assembly 1
2 715744 Coil Drain Plug 1
3 754711 Tee 3/8”1
4 801102 Hex Nipple 3/8”x 1-1/2”1
5 ■ Bolt 5/16”- 18 x 1”4
6 ■ Flange Nut 5/16”- 18 4
7 784304 Motor 2.0 HP 1
8 213045 Burner Exhaust Vent 1
9 722411 Vent Insulation 1
Ref. No. Part No. Description Qty.
10 860107 Vent Insulation Retaining Ring 1
11 Fig. 15 Control Box Assembly 1
12 Fig. 16 Coil Outlet Assembly 1
13 Fig. 17 Pump Assembly 1
14 824106 Wire Clip 1
15 ■ U-Bolt 1/4”- 20 x 1-1/4”x 2-1/4”2
16 ■ Locknut 1/4”- 20 4
■ Standard hardware item available locally.
8,9,10
7
5,6
2,3,4
1
11
12
13
14
15,16
F
PILOT
PUMP
ON
RESET
OFF TEMPERATURE
BURNER

Page17Hotsy 558/559
Figure 11 - Water Inlet Assembly
Ref. No. Part No. Description Qty.
1 856035 Garden Hose Gasket/Screen 1
2 801126 Garden Hose Connector 1
3 ✪ 873596 Detergent Injector Valve 1
4 823989 Hose Clamp 1
5 961534 Tubing 1/4” ✽
6 935159 Detergent Screen 1
7 867395 Hose 3/8” ✽
Ref. No. Part No. Description Qty.
8 898035 Nipple 3/8”x 3/8”Hose 1
9 875575 Garden Hose Connector Spring 1
✽ Order amount needed in feet.
Replacement Parts
✪ 753002 Detergent Injector Repair Kit
65
4
3
2
1
987

Page18 Hotsy 558/559
Figure 12 - Trigger Gun/Wand Assembly
Ref. No. Part No. Description Qty.
5 860447 Trigger Gun Fig. 13 1
Replacement Parts
✪ 859762 Insulator Grip Assembly 1
✪ 859763 Side Handle Grip 1
Ref. No. Part No. Description Qty.
1 799101 Adjustable Pressure Nozzle 1
2 ✪ 878917 Wand 1
3 826169 Quick Disconnect 1
4 915786 Quick Disconnect Plug 1
12345

Page19Hotsy 558/559
Figure 13 - Trigger Gun, Exploded View
Ref. No. Part No. Description Qty.
14 ✪ Plunger Seat 1
15 914141 Trigger Pin 1
16 860495 Left Gun Shell 1
17 735316 Phillips Screw 6
18 914142 Trigger Lock Pin 1
19 960271 Trigger 1
20 881941 Trigger Lock Lever 1
21 936460 Inlet Pipe Seat 2
22 914285 Inlet Pipe 1
23 851190 Inlet Fitting 1
24 860496 Right Gun Shell 1
Replacement Parts
✪ 877471 Trigger Gun Repair Kit
Ref. No. Part No. Description Qty.
1 817320 Valve Cap 1
2 ✪ Valve Cap O-Ring 1
3 ✪ Valve Seat Spring 1
4 ✪ Valve Spring 1
5 ✪ Ball 1
6 ✪ Valve Seat 1
7 ✪ Valve Seat O-Ring 1
8 812801 Valve Body 1
9 ✪ Plunger Guide Seat O-Ring 1
10 ✪ Plunger Guide Backring 2
11 ✪ Plunger Guide O-Ring 1
12 ✪ Plunger Guide 1
13 ✪ Plunger Rod 1
24
21
23
20
22
21
12345678
910 11 10 15
16
12 13 14
17
18
19

Page20 Hotsy 558/559
Figure 14 - Burner Assembly
Ref. No. Part No. Description Qty.
1 844627 Elbow3/4”2
2 908267 Nozzle #53 Natural Gas (559) 24
799051 Nozzle #64 LP Gas (558) 24
3 615645 Burner Ring w/Nozzles (559) 1
615425 Burner Ring w/Nozzles (558) 1
4 961464 Tubing1/4”Aluminum ✽
5 826050 CompressionFitting 1
6 921320 GasValve 1
7 890724 Tee 1/2”x 1/2”x 1/4”1
8 815277 Reducer Bushing 1/4”x 1/8”1
9 915564 PipePlug 1/8”1
10 897958 Nipple 1/2”x Close 1
11 875432 Pilot Indicator LightSwitch 1
12 ■ FlangeNut #10-24 2
13 ■ Screw #10-24 x 1/2”2
14 898361 Nipple 3/4”x 6”1
15 220364 Pilot MountingBracket 1
Ref. No. Part No. Description Qty.
16 ■ Screw #10-24 x 1”1
17 ■ Locknut #10-24 1
18 ■ Flat Washer #10 1
19 ■ Screw #10-32 x 1/4”2
20 829590 GasPilot 1
21 955901 Thermocouple 1
22 845001 Electrode With Bracket 1
23 ■ Bolt 1/4”-20 x 3-1/2”FullThread 1
24 ■ FlangeNut 1/4”-20 3
25 954919 RingTerminal 1
26 ■ Bolt 1/4”-20 x 1/2”1
27 676565 Fastener1/4”-20 1
28 898351 Nipple 3/4”x 2-1/2”1
29 898353 Nipple 3/4”x 3-1/2”1
✽ Order amount needed in feet
■ Standard item available locally.
SIDE VIEWS
TOP VIEW
7
8
9
10
11,12,13
14
20
19
16,17,18
15
21
22
23
24
2526,27
28
129
1
2
3
4
4
5
6