Hotsy 555SS Service manual

8.914-354.0
SERIAL NUMBER:
DATE PURCHASED:
FOR SALES AND SERVICE, PLEASE CONTACT:
OPERATING INSTRUCTIONS
AND PARTS MANUAL
SPECIFICATIONS
●Pump Volume At Pump Head: 2.2 GPM/132 GPH
●Burner Type: Fuel Oil Fired, 214,300 BTU/Hr.
●Burner Fuel Pressure: 200 PSI Max.
●Pump Pressure At Pump Head: 1300 PSI
●Machine Voltage: 120 VAC/60 Hz/1 Ph
●Total Machine Amperage: 20 Amps
●Machine Weight: 280 Lbs.
●Shipping Weight: 315 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length = 44", Width = 26", Height = 38"
MODEL 555SS
®
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I
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®
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!
NOTE: THIS MANUAL IS INTENDED FOR USE WITH
THE FOLLOWING MODEL RELEASE ONLY: 555SS

3
CONTENTS
HOTSY 555SS • 8.914-354.0 • Rev. 01/16
Model Number ______________________________
Serial Number ______________________________
Date of Purchase ____________________________
The model and serial numbers will be found on a decal attached
to the pressure washer.You should record both serial number and
date of purchase and keep in a safe place for future reference.
Important Safety Information 4-6
Component Identification 7
Assembly Instructions 8
Installation Instructions 8-9
Operation Instructions 9-10
General Cleaning Techniques 10
Storage 11
Maintenance 11
Troubleshooting 12-13
Exploded Views 14-15
Exploded View, Parts List 16
Burner Assembly, Exploded View & Parts List 17
Burner Hotsy Crossfire Exploded View & Parts List 18-19
Coil Outlett Exploded View & Parts List 20
Fuel Tank Assembly & Parts List 20
Control Panel Assembly & Parts List 21
Water Inlet Assembly & Parts List 22
Hose, Gun & Wand Assembly & Parts List 22
Pump Assembly & Parts List 23
Pump - Exploded View & Parts List 24-25
HM DX Unloader Exploded View & Parts List 26
Wiring Diagrams 27

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
4
INTRODUCTION & IMPORTANT SAFETY INFORMATION
Thank you for purchasing this Pressure Washer.
We reserve the right to make changes at any time
without incurring any obligation.
Owner/User Responsibility:
The owner and/or user must have an understanding of
the manufacturer’s operating instructions and warnings
before using this pressure washer.Warning information
should be emphasized and understood. If the operator
is not fluent in English, the manufacturer’s instructions
and warnings shall be read to and discussed with
the operator in the operator’s native language by the
purchaser/owner, making sure that the operator com-
prehends its contents.
Owner and/or user must study and maintain for future
reference the manufacturers’ instructions.
The operator must know how to stop the machine
quickly and understand the operation of all controls.
Never permit anyone to operate the engine without
proper instructions.
SAVE THESE INSTRUCTIONS
This manual should be considered a permanent
part of the machine and should remain with it if
machine is resold.
When ordering parts, please specify model and
serial number. Use only identical replacement parts.
This machine is to be used only by trained operators.
IMPORTANT SAFETY
INFORMATION
READ OPERATOR’S
MANUAL THOROUGHLY
PRIOR TO USE.
WARNING: To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1. Read the owner's manual
thoroughly. Failure to follow
instructions could cause
malfunction of the machine
and result in death, serious
bodily injury and/or prop-
erty damage.
2. Know how to stop the machine and bleed pressure
quickly. Be thoroughly familiar with the controls.
3. Stay alert — watch what you are doing.
4. All installations must comply with local codes.
Contact your electrician, plumber, utility company
or the selling distributor for specific details. If your
machine is rated 250 volts or less, single phase will
be provided with a ground fault circuit interrupter
(GFCI). If rated more than 250 volts, or more than
single phase this product should only be connected
to a power supply receptacle protected by a GFCI.
DANGER: Improper connection of the equipment-
grounding conductor can result in a risk of elec-
trocution. 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
KEEP WATER
SPRAY AWAY FROM
ELECTRICAL WIRING.
WARNING: Keep wand, hose, and
water spray away from electric
wiring or fatal electric shock may
result.
5. To protect the operator from
electrical shock, the machine
must be electrically grounded.
It is the responsibility of the
owner to connect this machine
to a UL grounded receptacle of proper voltage and
amperage ratings. Do not spray water on or near
electrical components. Do not touch machine with
wet hands or while standing in water. Always dis-
connect power before servicing.
RISK OF EXPLOSION:
OPERATE ONLY WHERE
OPEN FLAME OR TORCH
IS PERMITTED
WARNING
WARNING: Flammable liquids
can create fumes which can ig-
nite, causing property damage
or severe injury.
WARNING: Risk of explosion —
Operate only where open flame
or torch is permitted.
6. In oil burning models, use only kerosene, No. 1
home heating fuel, or diesel. If diesel is used, add
a soot remover to every tankful.
RISK OF FIRE.
DO NOT ADD FUEL
WHEN OPERATING
MACHINE.
WARNING
WARNING: Risk of fire — Do not
add fuel when the product is
operating or still hot.
WARNING: Do not use gasoline
crankcase draining or oil con-
taining gasoline, solvents or
alcohol. Doing so will result in
fire and/or explosion.
7. Oil burning appliances shall be installed only in
locations where combustible dusts and flammable
gases or vapors are not present. Do not store or
use gasoline near this machine.
8. Do not allow acids, caustic or abrasive fluids to pass
through the pump.
9. Never run pump dry or leave spray gun closed
longer than 1-2 minutes.
10. Keep operating area clear of all persons.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
5
PRESSURE WASHER OPERATOR’S MANUAL
RISK OF INJECTION
OR SEVERE INJURY
TO PERSONS. KEEP
CLEAR OF NOZZLE.
WARNING
WARNING: High pressure devel-
oped by these machines will
cause personal injury or equip-
ment damage. Keep clear of
nozzle. Use caution when oper-
ating. Do not direct discharge
stream at people, or severe in-
jury or death will result.
WARNING
PROTECT FROM
FREEZING
WARNING: Protect machine from
freezing.
15. To keep machine in best
operating conditions, it is
important you protect machine
from freezing.Failure to protect
machine from freezing
could cause malfunction of the
machine and result in death,
serious bodily injury, and/or property damage. Fol-
low storage instructions specified in this manual.
16. Inlet water must be clean fresh water and no hotter
then 90°F.
WARNING
RISK OF
ASPHYXIATION: USE
THIS PRODUCT ONLY
IN A WELL
VENTILATED AREA.
WARNING: Risk of asphyxiation.
Use this product only in a well
ventilated area.
17. Avoid installing machines in
small areas or near exhaust
fans. Adequate oxygen is
needed for combustion or
dangerous carbon monoxide
will result.
18. Manufacturer will not be liable for any changes
made to our standard machines or any components
not purchased from us.
19. The best insurance against an accident is precau-
tion and knowledge of the machine.
WARNING
RISK OF INJURY FROM
FALLS WHEN USING
LADDER.
WARNING: Be extremely careful
when using a ladder, scaffolding
or any other relatively unstable
location. The cleaning area
should have adequate slopes
and drainage to reduce the pos-
sibility of a fall due to slippery
surfaces.
20. Do not overreach or stand on unstable support.
Keep good footing and balance at all times.
21. Do not operate this machine when fatigued or under
the influence of alcohol, prescription medications,
or drugs.
IMPORTANT SAFETY INFORMATION
WARNING
USE PROTECTIVE
EYE WEAR
AND CLOTHING
WHEN OPERATING
THIS EQUIPMENT.
WARNING: High pressure spray
can cause paint chips or other
particles to become airborne
and fly at high speeds. To avoid
personal injury, eye, hand and
foot safety devices must be
worn.
11. Eye, hand, and foot protection
must be worn when using this
equipment.
WARNING
EAR PROTECTION
MUST BE WORN
WARNING: This machine exceeds
85 db appropriate ear protection
must be worn.
WARNING
HOT DISCHARGE FLUID:
DO NOT TOUCH OR
DIRECT DISCHARGE
STREAM AT PERSONS.
WARNING: Hot discharge fluid.
Do not touch or direct discharge
stream at persons.
WARNING: This machine pro-
duces hot water and must have
insulated components attached
to protect the operator.
WARNING
RISK OF INJURY:
HOT SURFACES
CAN CAUSE BURNS
WARNING: Risk of injury. Hot
surfaces can cause burns. Use
only designated gripping areas
of spray gun and wand. Do not
place hands or feet on non-insu-
lated areas of the pressure
washer.
12. To reduce the risk of injury, close supervision is
necessary when a machine is used near children.
Do not allow children to operate the pressure
washer. This machine must be attended during
operation.
TRIGGER GUN KICKS
BACK - HOLD WITH
BOTH HANDS
WARNING
WARNING: Grip cleaning wand
securely with both hands before
starting. Failure to do this could
result in injury from a whipping
wand.
13. Never make adjustments on
machine while in operation.
14. Be certain all quick coupler fit-
tings are secured before using
pressure washer.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
6
OFF
F°
10-02033
200
165
130
95
235
270
300
TEMPERATURE
BURNER
RESET
PUMP
ON
OFF
COMPONENT IDENTIFICATION
Pump — Delivers a specific gpm to the high pressure
nozzle which develops pressure.
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device.
Includes safety latch.
Detergent Valve — Allows you to siphon and mix
detergents.
Wand — Must be connected to the spray gun.
High Pressure Hose — Connect one end to water
pump high pressure discharge nipple and the other
end to spray gun.
Relief valve — Secondary pressure release in the
unlikely event the unloader valve fails.
Unloader Valve — Safety device which, when the spray
gun closes, prevents over pressurization.
Garden Hose
(Not Included)
Adjustable High
Pressure Nozzle
Wand
Burner Switch
Backflow
Preventer
Fuel Tank
Detergent
Inlet Line
High
Pressure
Hose
Power Cord
w/GFCI Trigger Gun
Relief Valve
Pump Switch
Hose Reel
Mount
Burner
Exhaust
Power Cord
Hanger
Detergent
Valve
IMPORTANT SAFETY INFORMATION
Follow the maintenance instructions
specified in the manual.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
7
PRESSURE WASHER OPERATOR’S MANUAL
3. Assemble pressure hose onto trigger gun/wand
assembly as shown in Figure 2.
4. Make sure that all plumbing connections are tight.
ASSEMBLY & INSTALLATION INSTRUCTIONS
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
•Wand Assembly
•Operating Instructions and Parts Manual
•Teflon Tape
Tools Required
•10" Adjustable Crescent Wrench (2 ea.)
Pressure Hose
1. When assembling, use teflon tape on all plumbing
connections to prevent leakage.
2. Install high pressure hose on machine as shown in
Figure 1.
Figure 2 - Pressure Hose Installation
Trigger Gun
Wand Assembly
Pressure Hose
INTALLATION
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 code.
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 wash
area and the pressure washer to prevent direct spray from
the wand coming in contact with the pressure washer.
Moisture reaching the equipment will reduce the pressure
washer’s life. All installations should comply with the local
codes covering such installations.
Venting
CAUTION: All venting must be in accordance with ap-
plicable federal and state laws, and local ordinances.
Consult local heating contractors.
If the pressure washer is to be used in an enclosed area,
a flue must be installed to vent burner exhaust to the
outside atmosphere. Exhaust gases should not be 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 lid. 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
cause an insufficient supply of oxygen. Proper combustion
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 air may have to be piped to the 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 proper
height and location to provide adequate draft.This oil fired
pressure washer must have a draft regulator installed in
the flue (available from most heating contractors). A draft
regulator will permit proper upward flow of exhaust flue
gases.
Figure 1 - Pressure Hose Installation
Relief Valve
Pressure
Hose

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
8
INSTALLATION & OPERATION INSTRUCTIONS
Crossfire Oil Burner
Burner Air Adjustment:The oil burner on this machine
is preset for operation at altitudes below 500 feet. If
operated at higher altitudes, it may be necessary to
adjust the air band for a #1 or #2 smoke spot on the
Bacharach scale.
To adjust, start machine and turn burner ON. Loosen
two locking screws found on the air band and close air
band until black smoke appears from burner exhaust
vent. Note air band position. Next, slowly open the air
band until white smoke just starts to appear. Turn air
band halfway back to the previously noted position.
Tighten locking screws.
Burner Air Adjustment
Reference Numbers
Air Band Locking Screws
Air Band
CAUTION: If white smoke appears from burner ex-
haust vent during start-up or operation, discontinue
use and readjust air bands.
NOTE: If a flue is installed, have a professional service-
man adjust your burner for a #1 or #2 smoke spot on
the Bacharach scale.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
9
PRESSURE WASHER
OPERATOR’S MANUAL
OPERATION INSTRUCTIONS
OPERATION
Before Starting
WARNING: Check hoses, trigger guns, fittings, and
fuel connections daily for signs of wear, cracks and
looseness, and replace as required.
1. Read all manuals provided with this pressure washer.
Become familiar with location and function of all
operating and safety controls.
2. Connect water supply hose to the standard garden
hose connector. The water faucet and supply hose
must be capable of providing 3.0 GPM.
3. Fill fuel tank. Use kerosene, #1 grade home heating
Figure 4 - Nozzle Installation/Manual Trigger Lock
Adjustable
Pressure Nozzle
Wand
Manual Trigger Lock
oil, #1 or #2 diesel fuel. DO NOT USE GASOLINE,
CRANKCASE OIL RESIDUALS OR WASTE OIL.
4. Check pump oil level.
5. If detergents are to be used, only use detergents
intended for pressure washers. Follow instructions on
the detergent container.
Electrical Connections
WARNING: Make sure all switches and controls are in
the OFF position prior to plugging in.
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
properly 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.
Connect electrical cord and test the GFCI using the reset
and test procedures provided on the GFCI device. The
GFCI must be reset and tested with every use. Do not use
machine if the GFCI device fails test.
Pressure Nozzle/Trigger Lock Installation
IMPORTANT: If the pressure washer has not been used
for an extended period of time, remove the nozzle from
the end of the wand and turn on water supply. Allow
water to run from the end of the wand until clear.
1. Install adjustable pressure nozzle on end of the wand.
See Figure 4.
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. The
trigger lock should be used whenever the trigger gun
is not in use.
To Start
IMPORTANT: The water must be turned on before
starting. Running the pump dry will cause damage to
pump seals 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. Turn water on.
2. Hold gun firmly, squeeze trigger of trigger gun and turn
pump switch ON. Allow air to purge from system.
3. If HOT water is desired, turn burner switch ON.
Adjust thermostat to desired temperature. The burner
will fire immediately with a small puff of smoke. If smoke
continues refer to the Troubleshooting Guide in this
manual. When the trigger gun is closed the burner
will turn off.
To Stop
1. If detergents were used, draw clear water through the
detergent line to purge detergent.
2. If burner was used, turn off burner switch and allow
pump to run cold water through coil.
3. Push OFF pump switch.
4. Turn OFF water supply.
5. Squeeze trigger gun open to relieve system pres-
sure.
NOTE: If the machine is unplugged from receptacle,
you must reset the GFCI power cord when machine
is plugged in. Always test GFCI before each use. See
instructions in the Electrical Connections section of
this manual.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
10
OPERATION INSTRUCTIONS & CLEANING TECHNIQUES
GENERAL CLEANING
TECHNIQUES
Warning: Pressure washers produce a kickback. To
prevent personal injuries due to falls use auxiliary
safety equipment.
The detergent injector valve 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 much as the pump cavitates because of 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
adjustment knob of the detergent injector valve.
See Figure 5. Turning the knob counterclockwise
will pull detergent into the system. The flow may be
observed
Figure 5 - Detergent Injector Valve
Water Adjustment Knob
Water
Increase Water
Decrease
Detergent
Off
Detergent
On
Detergent
Control Knob
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 turning
the black knob on the nozzle. See Figure 6. Pattern
can be from 0 degrees through 80 degrees fan spray.
Release the trigger of the trigger gun prior to making
any spray pattern adjustments.
Figure 6 - Nozzle Spray Pattern
Outer
Housing
Solid
Stream
Fan
Spray
Face View
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 cover-
age washing 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.
10. Small parts should be washed in a basket so the pres-
sure does not push them away. Larger, lightweight
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.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
11
PRESSURE WASHER OPERATOR’S MANUAL
STORAGE & MAINTENANCE
STORAGE
Storage
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 antifreeze, attach
a short length of hose to the garden hose connector
located on the pump. 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 of the trigger gun several
times to antifreeze the unloader system. Also draw
antifreeze through the detergent inlet line to antifreeze the
detergent system. For added protection after anti-freezing,
disconnect the pressure hose from machine and remove
the coil drain plug (refer to Exploded View for location).
After coil has drained, replace pressure hose and coil
drain plug. If the pressure washer is not to be used for
an extended length of time, it is recommended that the
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
oil for pump crankcase. Crankcase must be filled to the
full mark on the dipstick or to center of sight glass window
found on the side of the pump, 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 oil every 3
months or 300 hours, whichever comes first.
Figure 7 - Pump Lubrication
Oil Fill/
Dipstick
Oil
Drain
Sight
Glass
•Use only high quality detergents and follow manu-
facturer’s mix recommendations.
•Flush the system with clear 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 & Maintenance for details.
Pump Motor
On a yearly basis, oil pump motor per instructions on
motor nameplate.
Unloader Valve
WARNING: The unloader valve on this pressure
washer has been factory set and sealed and is a field
nonadjustable part. Tampering with the factory setting
may cause personal injury and/or property damage,
and will void the manufacturer warranty. For replace-
ment parts refer to Pump Assembly.
Burner Fuel Filter
Drain any water which has accumulated in fuel filter and
clean or replace element as needed. For replacement
parts, refer to Burner Assembly.
Heating Coil
Coil Descaling: In hard water areas, scale buildup within
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 oil 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.
Relief Valve
WARNING: The relief valve on this pressure washer
has been factory set and sealed and is a field non-
adjustable part. Tampering with the factory setting
may cause personal injury and/or property damage,
and will void the manufacturer warranty. For replace-
ment parts refer to Coil Outlet Assembly.
If pressure from pump or thermal expansion should
exceed safe limits, the relief valve will open, allowing
high pressure to be discharged through hose to ground.
Caution: Inspect relief valve annually for any
obstruction.
Proper Pump Care
•DO NOT pump acids.
•DO NOT allow pump to run dry.
•Winterize if storing in freezing temperatures, refer
to Storage & Maintenance for details.
•Use a water softener on the water system if known
to be high in mineral content.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
PRESSURE WASHER Troubleshooting Guide
12
TROUBLESHOOTING
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HOTSY 555SS • 8.914-354.0 • Rev. 01/16
13
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
Pressure washer will not
produce hot water.
Trigger of trigger gun released. Squeeze trigger. Water must be spraying
for burner to light.
Defective pressure switch. Replace pressure switch.
Fuel valve closed. Check that fuel valve on fuel tank is open.
Burner motor reset button (thermal
overload protector) tripped.
Push reset button on burner motor. If
tripped, check for proper voltage.
Clogged fuel filter. Replace fuel filter.
Thermostat set too low. Adjust thermostat to desired temp-erature.
Burner smokes. Air bands need to be adjusted. Readjust air band per the Oil Burner sec-
tion under Installation.
Improper fuel.
Low fuel pressure < 140 PSI
Weak fuel pump
Fuel filter partially cogged
Soot build up on coils
Lime build up in coils
Improper burner nozzle
Electrode is misaligned
Fuel pressure is to high for clean
burn (Fuel PSI above 140 but less
than 200)
Use proper fuel.
Adjust fuel pump pressure to specifications.
Check fuel pump pressure. Replace pump
if needed.
Replace as needed.
Clean coils with soot remover
Clean inside of coils using Landa's coil
cleaner.
See combustion assembly breakdown.
Realign electrodres to specs.
Reduce fuel PSI / increase air and band set
for cleaner burn without max water heat loss.
Poor cleaning Improper detergent concentration
or mixing.
Mix detergent per manufacturer's instruc-
tions. Ensure that powdered detergents
are fully dissolved.
Wrong detergent for the
application.
Select appropriate detergent.
Rinsing with hot water. A final rinse with cold water will reduce
water spotting.
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 visiting www.hotsy.com
A) SMOKES
WHILE UNIT IS
RUNNING
B) SMOKES AT
COLD-START
WHEN BURNER
IS OF
AB
AB
AB
AB
AB
AB
AB
AB
AB
B

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
14
EXPLODED VIEW
21
23
40
6
14 13
15
32
5
8
17
19
10
9
11 12
16
6
7
25
18
10
9
11
12
See
View A-A,
On Next
Page
20
53
59
19
6
63
65
66
61
64
62
60
33
33
35
35
34
34
57
58
59
6
39
6
67
31
30
For
Detail See
Burner
Assy
For
Detail See
Tank Assy

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
15
PRESSURE WASHER OPERATOR’S MANUAL
EXPLODED VIEW
OFF
F°
10-02033
200
165
130
95
235
270
300
TEMPERATURE
BURNER
RESET
PUMP
ON
OFF
12
11
10
54
28
29
26
9
See
Control
Box Assy
For Detail
1
24
View A-A
45
46
50
48
47
49
43
42
44 36
24
2
22
37
4
41
3
See
Coil Outlet
Assy for
Detail
55
27
56

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
16
EXPLODED VIEW PARTS LIST
ITEM PART NO. DESCRIPTION QTY
1 9.802-431.0 Power Cord w/ GFCI 1
2 8.932-969.0 Label, Warning, Svc Cord 1
3 8.704-654.0 Label, Hotsy Logo Red 2
4 8.900-896.0 Label, Operating Oil Fired 1
Electric.
5 8.911-832.0 Frame Welded Assy Hotsy 1
555/680/770
6 9.802-778.0 Nut, 5/16" Whiz Loc Flange 6
7 Please See Burner Assembly Page
8 8.901-106.0 Label, Hotsy Logo Stripe 2
9 9.802-274.0 Wheel & Tire Hard Rubber 4
10 9.802-810.0 Washer 5/8" Flat Sae Zinc 8
11 8.718-870.0 Nut, .61 ID, Push Flat 4
12 9.182-506.0 Hubcap 4
13 9.802-104.0 Bushing, 1" Snap 1
14 8.706-731.0 Bushing, 3/4" Snap 1
15 Please See Pump Assembly Page
16 Please See Fuel Tank Assembly Page
17 Please See Water Inlet Assembly Page
18 8.911-807.0 Bracket, Hose Reel 1
19 8.718-625.0 Bolt, 5/16" x 3/4" Nc Znc 8
20 8.752-969.0 Strain Relief, Str, Lt,1/2 NPT1
21 8.754-709.0 MOTOR, 2HP, 1PH, 115V,
1750RPM 56C ODP 1
22 8.719-913.0 Top Hat, Weld Assy, 16" 1
23 8.706-698.0 Cap, 0.812 Od x 1" Vinyl Blk 1
24 9.802-825.0 Clip, Retaining U-type 4
25 8.718-618.0 Bolt, 5/16-18 x 3/4", Hh Znc 1
26 8.705-974.0 Nipple, 3/8" Hex Steel 1
27 8.706-214.0 Tee, 3/8" Female Pipe 1
28 9.802-036.0 Nipple, 1/2" Jic x 3/8" Npt 1
29 8.706-241.0 Plug, 3/8", Sq Head, Galv 1
30 8.718-582.0 ▲ Bolt 1/4-20 x 1/2", Nc Hh 2
31 9.802-802.0 ▲ Washer 1/4" Flat Sae Znc2
32 9.802-716.0 Bolt, 5/16" x 2", Nc Hh 4
33 8.709-090.0 Clamp, Wire/Tube, 0.750D 2
34 8.718-588.0 Screw, 10-24" x 1/2", Ph 2
35 8.718-857.0 Nut, 10/24, Whiz Loc 2
Flange
36 9.802-908.0 Insulation, Blanket, 1
18 x 52, Fiberglass
37 9.802-903.0 Insulation, Bottom, 1
16 Od x 4.5, Fiberglass
39 9.803-098.0 Holder 1
40 8.920-274.0 Handle 1
41 8.911-803.0 Wrap, Outer Coil Assy 1
S.S., Hotsy 555
42 9.802-904.0 Insulation, Top Head, 1
16 Od x 8 ID, Fiberglass
ITEM PART NO. DESCRIPTION QTY
43 9.803-108.0 Ring, Insul Retainer 1
16" Top Hat
44 8.919-135.0 Coil, 16", Hotsy 555 1
45 9.802-705.0 Bolt, 1/4"-20 x 1" Carriage 4
Zinc
46 9.802-773.0 Nut, 1/4-20 Esna Nc 4
47 9.802-802.0 Washer 1/4" Flat Sae Zinc 12
48 8.912-020.0 Linkage, Brake, Red 1
49 8.912-017.0 Lever, Brake, Red 1
50 8.912-019.0 Bracket, Brake Pad, Red 1
53 9.800-049.0 Label, Manufacturers 1
Cleaning Solution
54 8.706-207.0 Elbow, 3/8" Street 90 Deg 1
Steel
55 9.802-041.0 Elbow, 3/8" Street 45 Deg 1
Steel
56 8.704-656.0 Label, Warning, Hww Elec 1
57 9.198-014.0 Washer 21/64 x 1" 3
58 9.802-776.0 Nut, 5/16", Esna, Nc 3
59 8.718-980.0 Washer, 5/16" Flat, Sae 3
60 8.901-136.0 Label, Use Hotsy Detergent 1
61 8.901-135.0 Label, Caution Winterize 1
62 8.901-125.0 Label, Detergent Metering 1
63 8.901-124.0 Label, Water Metering 1
64 8.718-607.0 Bolt, 1/4-20 x 3/4" 2
Carriage
65 9.802-775.0 Nut, 1/4" Flange, Zn 2
66 8.709-100.0 Clip, Round, 0.84 Id, Plated 1
67 8.706-744.0 Plug, Plastic 1" 1
▲ Not Shown

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
17
PRESSURE WASHER OPERATOR’S MANUAL
BURNER ASSEMBLY EXPLODED VIEW PARTS LIST
13
11
3
6
5
4
8
9
10
1
14
12
13 1/8"min
5/32" max Gap
1/8" AC
3/16" DC Nozzle-to-tip
spacing
1/4" Above
nozzle center
1-3/8"
BURNER ASSEMBLY EXPLODED VIEW
2
15
18
23
7
16
ITEM PART NO. DESCRIPTION QTY
1 8.918-907.0 Burner, Hotsy Crossfire 1
2 8.706-941.0 Hose Barb, 1
1/4" Barb x 1/4" Mpt, Brass
3 8.706-827.0 Elbow, 1/4" Street 1
4 9.803-043.0 Nipple, Pipe 1/4" x 2" 1
Zinc Sch 80 Mpt
5 8.706-297.0 Bushing, 3/8" Steel Yellow 1
Chrome
6 8.709-153.0 Filter, Fuel Hotsy, 3/8" Fem 1
7 8.706-965.0 Hose Barb, 1
1/4" Barb x 3/8" ML Pipe, 9
8 8.700-759.0 Fuel Pump Suntec 120V 1
9 9.802-640.0 Fuel Solenoid 1
10 8.919-114.0 Ignitor, 120V Crossfire 1
11 8.750-778.0 Electrode Crossfire 1
12 9.802-655.0 Air Cone, F-6 1
13 8.754-895.0 Fuel Nozzle 1.25 x 90 B
w/ 100 PSI Check Valve 1
14 8.750-517.0 Motor, 120V Crossfire 1
15 6.390-126.0 Clamp Hose, Uni .46-.54 1
16 8.750-933.0 Band Hose Clamp, Hose
id 1/8" - 5/16" 1
17 8.754-911.0 Check Valve, 1 way, 1/4" 1
ITEM PART NO. DESCRIPTION QTY
16 8.717-711.0 ▲ Screen, Fuel Filter 1
17 9.802-649.0 ▲ Blower Wheel 4.25 x 2.5 1
Beckett
8.750-520.0 ▲ Blower Wheel Crossfire 1
18 9.802-648.0 ▲ Coupling Assy 5/16" 1
Beckett
8.750-543.0 ▲ Coupling Crossfire 1
19 9.802-646.0 ▲ Valve Stem Kit
Cleancut Pump
20 9.802-666.0 ▲ Screen, Fuel Pump 1
21 9.802-514.0 ▲ Strain Relief, Lt, Str, 1
1/2 Npt, .23-.45 D
22 9.802-525.0 ▲ Locknut, 1/2" 1
23 9.801-264.0 Label, Hotsy Crossfire 1
▲ Not Shown
Cone distances
and electrode
gaps checked with
burner gage
(8.922-740.0), sold
separately.

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
18
Replacement Parts
For best performance specify genuine KNA replacement parts
BURNER HOTSY CROSSFIRE EXPLODED VIEW
5
4
50
51
55

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
19
PRESSURE WASHER OPERATOR’S MANUAL
Replacement Parts
For best performance specify genuine KNA replacement parts
BURNER HOTSY CROSSFIRE PARTS LIST
Item # Part # Description Qty Item # Part # Description Qty
1 8.919-050.0 BURNER HOUSING ASSEMBLY 1 23 8.919-116.0 IGNITOR, BURNER 12VDC 1 2 8.751-160.0 AIR GUIDE 24 8.751-165.0 PLUG, HOLE 0.875 PLASTIC 1 3 8.700-758.0 FUEL PUMP, SUNTEC A2VA-3106 12-24V SOL 1 25 8.750-830.0 PLUG, HOLE 0.285 PLASTIC 1 3 8.700-759.0 FUEL PUMP, SUNTEC A2VA-3106 120V SOL 1 26 8.751-134.0 PLUG, 1/8" NPT x HEX SHOULDER 1 3 8.700-760.0 FUEL PUMP, SUNTEC A2VA-3106 230V SOL 1 27 8.918-454.0 GASKET, JUNCTION BOX 1 3 8.753-000.0 FUEL PUMP, DANFOSS 071N1298 1 28 8.750-542.0 COVER, JUNCTION BOX 1 4 8.750-762.0 COIL, SOLENOID DANFOSS 230V 1 29 8.750-116.0 BLOCK, TERMINAL, 5 POLE 1 4 8.750-763.0 COIL, SOLENOID DANFOSS 115V 1 30 8.750-817.0 LIGHT, INDICATOR, GREEN 14V 2 4 8.750-764.0 COIL, SOLENOID DANFOSS 12-24V 1 30 8.750-818.0 LIGHT, INDICATOR, GREEN 28V 1 5 8.750-765.0 CABLE, SOLENOID COIL, DANFOSS 1 30 8.750-819.0 LIGHT, INDICATOR, GREEN 125V 1
5a 8.750-783.0 MOUNTING KIT, FLANGE/HUB, DANFOSS 1 30 8.750-820.0 LIGHT, INDICATOR, GREEN 250V 1
6 8.750-541.0 AIR BAND 1 31 8.750-784.0 SITE GLASS 1 7 8.750-517.0 MOTOR, 1/6 HP 115V 60Hz 1 32 8.750-785.0 RING, PUSH ON INTERNAL, 1305-112 1 7 8.750-518.0 MOTOR, 1/6 HP 230V 60Hz 1 33 8.733-001.0 SCREW, 8 x 1/4" HI LOW THREAD CUT, PPH 2 7 8.751-074.0 MOTOR, 1/7 HP 12VDC AMETEK 1 34 8.718-762.0 SCREW, 8-32 X 1/2", M PH RDH PL 2 8 8.750-543.0 COUPLING, FLEX, 1/2" x 5/16" 1 35 8.750-769.0 SCREW, 8/32 X 3/8" PH 1 8 8.751-073.0 COUPLING, FLEX, 5/16" x 5/16" 1 36 8.718-810.0 SCREW, 10/32 x 1/2", WHIZ LOC FLANGE 6 9 8.750-520.0 FAN, 4.53" X 2.42", 1/2" BORE, F115-62S 1 37 8.750-770.0 SCREW, 10/32 x 5/8", WHIZ LOC FLANGE 3 9 8.751-072.0 FAN, 4.53" x 2.42" x .313 BORE, F115-625 1 38 8.750-816.0 SCREW, 10/32 X 1/4" GROUNDING 1
11 8.750-547.0 CONNECTOR, 37 DEG FLARE X 1/8" NP LONG 1 39 8.750-768.0 SCREW, 1/4-20 x 1", WHIZ LOC FLANGE 4 12 8.750-545.0 CONNECTOR, 37 DEG FLARE X 1/8" NPT 1 40 8.750-771.0 SCREW, 1/4-20 X 1/2", PHIL FHMS 4 13 8.749-000.0 FUEL LINE ASSEMBLY 1 42 — LABEL, BRAND NAME 1 14 8.918-864.0 FLANGE 1" TUBE ASSY, BURNER 1 43 9.801-268.0 LABEL, DISCONNECT POWER SUPPLY 1 15 8.918-866.0 FLANGE 3" TUBE ASSY, BURNER 1 44 — LABEL, SERIAL PLATE 1 16 8.750-539.0 GASKET, FLANGE 1 46 9.807-339.0 LABEL, WIRING DIAGRAM, BURNER 115V-115V 1 17 8.750-528.0 DISK, STATIC 2.00 1 46 9.807-340.0 LABEL, WIRING DIAGRAM, BURNER 230V-230V 4 17 8.918-868.0 DISK, STATIC 2.75 1 46 9.807-341.0 LABEL, WIRING DIAGRAM, BURNER 230V-115V 1 17 8.918-869.0 DISK, STATIC 2.50 1 46 9.807-342.0 LABEL, WIRING DIAGRAM, BURNER 115V-24V 1 17 8.918-870.0 DISK, STATIC 2.25 1 46 9.807-343.0 LABEL, WIRING DIAGRAM, BURNER 230V-24V 1 18 8.750-526.0 GUN, ELECTRODE / NOZZLE, 3" 1 46 9.807-344.0 LABEL, WIRING DIAGRAM, BURNER 12VDC 1 19 8.750-525.0 GUN, ELECTRODE / NOZZLE, 1" 1 48 9.801-274.0 LABEL, BURNER LIGHTS 1 20 9.802-582.0 FUEL NOZZLE 1.25 X 90 B 1 49 8.919-105.0 PLATE, TERMINAL BLOCK NUMBERS 1 21 8.750-778.0 ELECTRODE, IGNITION 1 50 8.716-451.0 TERMINAL, JUMPER SPADE 1 22 8.750-779.0 CONE, AIR F4 1 51 9.802-510.0 CABLE, TIE, 4" BLACK 2 22 8.750-782.0 CONE, AIR F6 1 52 9.807-348.0 LABEL, CLEAR MYLAR 1 22 8.750-780.0 CONE, AIR F12 1 53 9.807-345.0 LABEL, IGNITER 120V 1 22 8.750-781.0 CONE, AIR F22 1 53 9.807-346.0 LABEL, IGNITER 230V 1 23 8.919-114.0 IGNITOR, BURNER 120V 1 53 9.807-347.0 LABEL, IGNITOR 12VDC 1
23 8.919-115.0 IGNITOR, BURNER 230V 1
54 8.900-083.0 100 PSI CHECK VALVE 1 55 8.754-905.0 8.754-905.0 GASKET, KNA BURNER PUMP SUNTEC 1

HOTSY 555SS • 8.914-354.0 • Rev. 01/16
OPERATOR’S MANUAL PRESSURE WASHER
20
COIL OUTLET ASSEMBLY EXPLODED VIEW & PARTS LIST
1
2
3
4
5
6
7
8
FUEL TANK ASSEMBLY EXPLODED VIEW & PARTS LIST
1
9
28
6
3
57
10
4
To Burner
Inlet
To Burner
Bypass
ITEM PART NO. DESCRIPTION QTY
1 9.149-003.0 Manifold Coil Outlet 1
Discharge
2 8.706-241.0 Plug, 3/8" Sq Head, Galv 1
3 9.196-012.0 Screw, 10-24 x 1/4" Hex Set 1
4 9.802-041.0 Elbow, 3/8" Street 45 Deg 1
Steel
5 9.802-171.0 Coupler, 3/8" Plug, Male 1
Steel / Zinc
6 8.902-433.0 Valve, Safety Relief VSA 1
7 8.711-785.0 Hose, 3/8" Push On, 28"
Per Ft
8 9.800-021.0 Label, Hot Water Outlet 1
ITEM PART NO. DESCRIPTION QTY
1 8.706-614.0 Tank, Fuel, 8 Gal Hotsy 1
2 8.901-134.0 Label, Fuel Type 1
3 9.803-535.0 Cap With Fuel Display 14" 1
4 9.802-254.0 Hose 1/4" x 20" Push-On, 20"
Fuel Line
5 9.802-141.0 Hose Barb, 1/4" Barb x 3/8" 1
Barb, Dou
6 9.802-254.0 Hose, 1/4" Push-On, Ft 18"
7 6.390-126.0 Clamp, Hose, .46-.54 St 1
8 9.802-053.0 Bushing, Fuel Line, Rubber 2
9 9.802-177.0 Valve, 1/4" Shut Off, 1
180 Deg
10 8.750-933.0 Band Hose Clamp,
Hose id 1/8"- 5/16" 1