Hotsy 1812SS Service manual

SERIAL NUMBER:
DATE PURCHASED:
FOR SALES AND SERVICE, PLEASE CONTACT:
OPERATING INSTRUCTIONS
AND PARTS 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!
1800
GAS-FIRED SERIES
NOTE: This manual is intended for use with the
following model releases only:
1812SS 1812SS-208
1822SS 1822SS-208
1825SS 1836SS
1852SS 1852SS-208
1862SS 1862SS-208
1855SS 1856SS

1812SS SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 230VAC/60Hz/1Ph
 Total Machine Amperage: 42 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1812SS-208 SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 208VAC/60Hz/1Ph
 Total Machine Amperage: 48 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1822SS SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 230VAC/60Hz/3Ph
 Total Machine Amperage: 28 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1822SS-208 SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 208VAC/60Hz/3Ph
 Total Machine Amperage: 33 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 855 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1825SS SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 460VAC/60Hz/3Ph
 Total Machine Amperage: 14 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1836SS SPECIFICATIONS
 Pump Volume At Pump Head: 5.9 GPM/354 GPH
 Pump Pressure At Pump Head: 2500 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 575VAC/60Hz/3Ph
 Total Machine Amperage: 11 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1852SS SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 230VAC/60Hz/1Ph
 Total Machine Amperage: 42 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1852SS-208 SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 208VAC/60Hz/1Ph
 Total Machine Amperage: 48 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
Hotsy 1800 • 97-6244 Rev. 7/06

1862SS SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 230VAC/60Hz/3Ph
 Total Machine Amperage: 28 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1862SS-208 SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 208VAC/60Hz/3Ph
 Total Machine Amperage: 33 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1855SS SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 460VAC/60Hz/3Ph
 Total Machine Amperage: 14 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
1856SS SPECIFICATIONS
 Pump Volume At Pump Head: 4.8 GPM/288 GPH
 Pump Pressure At Pump Head: 3000 PSI
 Burner Type: Natural Gas Fired, 558,058 BTU/Hr.
 Machine Voltage: 575VAC/60Hz/3Ph
 Total Machine Amperage: 11 Amps
 Machine Weight: 770 Lbs.
 Shipping Weight: 885 Lbs.
 Exhaust Stack Size: 10"
 Machine Dimensions:
Length=51.5", Width=25.5", Height=56"
Hotsy 1800 • 97-6244 Rev. 7/06

CONTENTS
4
1800 Series Manual • Form #97-6244 • Revised 7/06
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.
Component Identification............................................................................................................... 5
Assembly ....................................................................................................................................... 6
Installation...................................................................................................................................... 7
General Safety Information.........................................................................................................7-9
Operation .................................................................................................................................. 9-11
Storage ........................................................................................................................................ 11
Maintenance ................................................................................................................................ 12
Troubleshooting ......................................................................................................................13-15
Exploded View ........................................................................................................................16-17
Exploded View Parts List ........................................................................................................18-19
Hose & Trigger Gun Assembly and Parts List.............................................................................. 20
Trigger Gun Assembly and Parts List .......................................................................................... 21
Control Panel Assembly Exploded View...................................................................................... 22
Control Panel Assembly Parts List............................................................................................... 23
Coil Outlet and Parts List ............................................................................................................. 24
Float Tank Assembly and Parts List............................................................................................. 25
Burner Assembly ......................................................................................................................... 26
Burner Assembly Parts List ......................................................................................................... 27
Pump Assembly and Parts List.................................................................................................... 28
Unloader VB9 Exploded View & Parts List................................................................................... 29
Pump, Exploded View & Parts List.......................................................................................... 30-31
Wiring Diagram - 1PH.................................................................................................................. 32
Wiring Diagram - 3PH.................................................................................................................. 33
Warranty

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 5
Hotsy 1800 • 97-6244 Rev. 7/06
COMPONENT IDENTIFICATION
Burner
Exhaust Vent
Thermostat
Pump Switch
High
Pressure
Nozzle
Wand
High Pressure
Hose
Detergent Bucket
(not included)
Float Tank
Thermal Rupture
Disk
Burner Switch
Fresh Water
Inlet
Garden Hose
(not included)
Trigger Gun
Detergent
Control
Nozzles

61800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
ASSEMBLY
Unpacking
Unpack carefully.Wear safety glasses or goggles while un-
packing, assembling or operating pressure washer. If there
are missing components or hidden damage immediately
contact distributor or carrier concerning discrepancies.
1. Unbolt pressure washer from pallet.
2. Remove pressure washer from pallet.
Parts Included
• Pressure Washer
• Pressure Hose
• Hose Hanger
• Wand
• Operating Instructions and Parts Manual
Tools Required
• 10" Adjustable Crescent Wrenches (2 ea.)
• Teflon Tape
• Blade Screwdriver
Pressure Hose, Wand and Wand Holder
1. Use teflon tape on plumbing connections to prevent
leakage.
2. Install pressure hose on machine as shown in
Figure 1.
Figure 1 - Installing Pressure Hose
Figure 2 - Assembling Wand Components
Pressure Hose
Thermal
Rupture Disk
Quick Disconnect Plug Wand
Quick
Disconnect
Trigger Gun
Pressure Hose
3. Assemble wand components as shown in Figure 2.
Connect pressure hose to trigger gun.
NOTE: The nozzle is not to be installed at this time.
4. Make sure that all plumbing connections are tight.
Hose Hanger
1. Install the hose hanger on the machine coil tank as
shown in Figure 3.
Gas Valve
1. Install gas valve on machine as shown. (Plastic cover
should point upwards).
Figure 4 - Installing Gas Valve
Figure 3 - Hose Hanger Installation
Hose Hanger
Pocket on
Coil Tank

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 7
Hotsy 1800 • 97-6244 Rev. 7/06
INSTALLATION
Owner/User Responsibility
The owner and/or user must have an understanding
of the manufacturer’s operating instructions and warn-
ings before using this Hotsy 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 compre-
hends its contents.
Owner and/or user must study and maintain for future
reference the manufacturers’ 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.
Getting Started
IMPORTANT: Proper initial installation of equipment will
assure more satisfactory performance, longer service
life and lower maintenance cost.
The pressure washer should be run on a level surface and in
a protected area 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
service life. All installations should comply with the local
codes covering such installations.
GENERAL SAFETY INFORMATION
CAUTION: To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1.Read the owner's manual thor-
oughly. Failure to follow instruc-
tions could cause malfunction
of the machine and result in
death, serious bodily injury
and/or property damage.
2. Know how to stop machine and bleed pressures
quickly. Be thoroughly familiar with the controls.
3. Stay alert — watch what you are doing.
4. All installations must comply with local codes. Con-
tact your electrician, plumber, utility company or the
selling distributor for specific details.
WARNING: Risk of asphyxiation.
Use this product only in a well
ventilated area.
5. Risk of explosion — do not
spray flammable liquids or op-
erate in an explosive location.
Operate only where open flame
or torch is permitted.
WARNING: Keep water spray
away from electrical wiring or fa-
tal electrical shock may result.
6. 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 amper-
age ratings. Do not spray water on or near electrical
components. Do not touch machine with wet hands
or while standing in water. Always disconnect power
before servicing.
7. Grip cleaning wand securely with both hands before
starting the cleaner. Failure to do this could result in
injury from a whipping wand.
WARNING: High pressure stream
of fluid that this equipment can
produce can pierce skin and its
underlying tissues, leading to
serious injury and possible am-
putation.
8. High pressure developed by
these machines can cause per-
sonal injury or equipment dam-
age. Use caution when oper
ing. Do not direct discharge stream at people, or
severe injury and/or death may result.
9. Never make adjustments on machine while in op-
eration.
WARNING: High pressure spray
can cause paint chips or other
particles to become airborne and
fly at high speeds.
10. Eye safety devices and foot
protection must be worn when
using this equipment.
WARNING
RISK OF
ASPHYXIATION.
USE ONLY IN A WELL
VENTILATED AREA.
WARNING
READ OPERATOR’S
MANUAL
THOROUGHLY
PRIOR TO USE.
WARNING
HIGH PRESSURE
SPRAY CAN PIERCE
SKIN AND TISSUES.
WARNING
PROTECTIVE
EYEWEAR AND
CLOTHING MUST
BE WORN.
WARNING
KEEP WATER SPRAY
AWAY FROM
ELECTRICAL WIRING.

81800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
11. When the machine is working, do not cover or place
in a close space where ventilation is insufficient.
12. Do not operate with the spray gun in the off position
for extensive periods of time as this may cause dam-
age to the pump.
13. Protect from freezing.
14. Be certain all quick coupler fittings are secured
before using pressure washer.
15. Do not allow acids, caustic, or abrasive fluids to pass
through the pump.
16. Inlet water must be from a cold, fresh city water
supply.
17. To reduce the risk of injury, close supervision is nec-
essary when a machine is used near children. Do not
allow children to operate the pressure washer. This
machine must be attended during operation.
18. The best insurance against an accident is precaution
and knowledge of the machine.
19. Do not operate this product when fatigued or under
the influence of alcohol or drugs. Keep operating
area clear of all persons.
20. Do not replace LP tank while machine is running.
Serious injury could result.
21. The LP models are designed to run on vapor pro-
pane fuel. Do not use liquid fuel. Have a qualified
serviceman install and service your equipment.
22. Never expose a spark or flame where there may be
unburned gas present.
23. Some gases are heavier than air and will spill out on
the floor. Therefore always provide adequate space
and ventilation around these machines. Install the
machine 18" above the floor.
24. Hotsy will not be liable for any changes made to
our standard machines, or any components not
purchased from Hotsy.
25. Do not overreach or stand on unstable support.Keep
good footing and balance at all times.
26. Follow maintenance instructions specified in man-
ual.
27. When making repairs, disconnect from electrical
source and shut off gas valve.
28. Turn burner off and cool to 100°F before turning
machine off.
29. Extinguish any open flame, and test all joints with a
soap solution. If the odor persist, call your gas sup-
plier immediately.
30. This machine must be attended during operation.
31. A draft hood shall be installed if this machine is go-
ing to be permanently installed and vented to the
outside of the building.
Figure 5 - Down Draft Diverter
Example Of Down
Draft Diverter
For Gas Fired
Machines
Venting
WARNING - RISK OF EXPLOSION: Do not spray flam-
mable liquids or operate machine in areas where flam-
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 hazardous
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. Therefore,
always provide adequate space and ventilation around
these units.
IMPORTANT: A draft diverter shall be installed.
INSTALLER UNE HOTTE DE TIRAGE.
IMPORTANT: All venting must be in accordance with
applicable 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 into a concealed space in 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 loca-
tions 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 gas fired pressure washer
must have a draft diverter installed in the flue. See Figure
5 for details. A draft diverter will permit proper upward flow
of exhaust flue gases.

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 9
Hotsy 1800 • 97-6244 Rev. 7/06
Water Supply
Connect water supply hose to water inlet on float tank. The
water faucet and supply hose must be capable of providing
a minimum of 6.0 gallons per minute (GPM).
Fuel Supply
CAUTION: Have a qualified gas serviceman install and
service your equipment.
WARNING: Gas line supply pressure must not exceed
14 water column inches (.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 560,000 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.
Natural Gas Fuel
Have a qualified gas serviceman install the natural gas
fuel supply line to the machine. See Figure 6 for location
of gas inlet.
Gas Valve
The ideal incoming gas pressure is 11 w.c.i. (water column
inches) minimum 6 w.c.i., maximum 14 w.c.i. or 1/2 psig.
The correct operating manifold pressure for natural gas
is 3.5 w.c.i. The operating manifold pressure for propane
gas is 11 w.c.i. The gas valve pressure regulator can be
adjusted between 3 and 4 w.c.i. natural gas or 6 and 11
w.c.i.for propane.
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 servicing
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 ground-
ed. LA MACHINE DOIT ÊTRE MISE À LA TERRE.
Grounding Instructions: Make sure all switches and
controls are in the OFF position prior to connecting elec-
trical supply. Do not stand in water while connecting and
disconnecting electrical supply. If it should malfunction or
break down, grounding provides a path of least resistance
for electric current to reduce the risk of 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.
The 1800 Series are not provided with a power cord.
These models must be connected to a grounded, metal,
permanent wiring system. Refer to wire diagrams for proper
incoming power connections.
Extension Cords: Do not use extension cords with this
equipment.
WARNING:To reduce the risk of electrocution, keep all
connections dry and off the ground.
OPERATION
Before Starting
1. Read all manuals provided with this pressure washer.
Become familiar with location and function of all
operating and safety controls.
WARNING: Check hoses, fittings, wand, trigger gun
and fuel connections daily for signs of wear, cracks
and looseness, and replace as required.
Figure 6 - Gas Valve and Regulator Side View
Outlet port
Inlet Port

10 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
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.
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. Therefore,
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 qualified
operators.
AVERTISSEMENT: RISQUE D’INJECTION ET DE BLES-
SURES GRAVES. SE TENIR À L’ÉCART DU JET. NE PAS
DIRIGER LE JET DE SORTIE VERS D’AUTRES PER-
SONNES. CONFIER L’UTILISATION DE CE MATÉRIEL
À UN OPÉRATEUR QUALIFIÉ.
WARNING:Wear eye, ear, hand, foot and skin protection
at all times while operating pressure washer.
WARNING: Before changing pressure nozzle, engage
manual trigger gun lock.
IMPORTANT:The water must be turned on before start-
ing. Running the pump dry will cause damage and void
warranty.
IMPORTANT: Do not allow the machine to run with
trigger of the trigger gun released for more than
2 minutes at any one time or damage to pump may
occur.
1. Turn ON water supply.
2. Turn ON gas supply.
3. 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.
4. If HOT water is desired, adjust the thermostat to
the proper temperature and turn burner switch ON.
Squeeze trigger of trigger gun. The pilot will automati-
cally light, quickly followed by the firing of the burner
ring. When the trigger of the trigger gun is 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.
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 7.The trigger lock should be used whenever
the trigger gun is not in use.
IMPORTANT: On initial start-up or if maintenance
has been performed on the burner assembly, it will be
necessary to bleed the air from the gas line before the
pilot will light.
7. If you are running the machine for the first time, or
have performed maintenance on the burner assembly,
there will be air in the gas line. To bleed the air from
the gas line run the pressure washer with pump and
burner switches on and thermostat on highest setting.
Squeeze the trigger of the trigger gun for 15 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 Troubleshooting
Guide in this manual.
2. Connect water supply hose to the standard garden
hose connector. The water faucet and supply hose
must be capable of providing 6.0 GPM.
3. This machine was factory built for Natural Gas. See
instructions under Fuel Supply (Page 9).
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.
IMPORTANT: Before installing pressure nozzle on initial
start-up, turn on the water supply, start the pump by
pressing the pump ON switch, and hold the wand trig-
ger 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 pressure
nozzle from the end of the wand and turn on water
supply, and start the pump by pressing the pump ON
switch. Hold the wand trigger open and allow water to
run from the end of the wand until clear.
6. Install the pressure nozzle on end of wand, refer to
Figure 7.
Figure 7 - Nozzle Installation/Manual Trigger Lock
Manual Trigger Lock
Pressure
Nozzle

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 11
Hotsy 1800 • 97-6244 Rev. 7/06
To Clean
WARNING: Risk of injection or severe injury - Keep clear
of nozzle - DO NOT direct discharge stream at per-
sons - This machine is to be used only by qualified
operators.
AVERTISSEMENT: RISQUE D’INJECTION ET DE BLES-
SURES GRAVES. SE TENIR À L’ÉCART DU JET. NE PAS
DIRIGER LE JET DE SORTIE VERS D’AUTRES PER-
SONNES. CONFIER L’UTILISATION DE CE MATÉRIEL
À UN OPÉRATEUR QUALIFIÉ.
1. Refer to the chart in Figure 8. This machine
has been equipped with three (3) detergent metering
plugs. A red plug has been installed in the detergent
screen.This plug has been factory drilled with a #60 drill
bit. The chart indicates that a #60 hole will allow a 1%
detergent concentration, (or a 1/100 detergent-to-water
ratio).The other two (2) detergent plugs have not been
drilled. Use the chart to determine the hole size needed
to achieve a desired detergent concentration. Install the
plug which will provide the correct concentration for the
detergent to be used before proceeding.
2. Insert detergent inlet line into container of mixed
detergent. Open detergent ON/OFF valve. The
detergent will be pulled automatically into the system.
Allow detergent to reach end of wand before pro-
ceeding to step 3.
3. Select pressure nozzle with spray pattern that matches
your cleaning needs. Engage manual trigger lock, refer
to Figure 6, and install selected nozzle.
4. 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.
5. Do not wash at a 90° angle to the work (straight at
it). This will allow water to splash back at you and
reduces your cleaning power. Wash at a 30° to 60°
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.
6. 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.
7. 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.
8. Small parts should be washed in a basket and larger,
lightweight parts should be clamped down so the pres-
sure does not push them away.
9. Close the detergent ON/OFF valve to permit rinse.
Always rinse with cold water after using detergents.
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
1. If detergents were used, draw clear water through the
detergent 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 pump switch OFF.
4. Turn water supply OFF.
5. Squeeze trigger gun open to relieve system pres-
sure.
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.
IMPORTANT: Machine must be stored indoors.
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 sol-
vent to antifreeze). To flush the system fill the float tank
with antifreeze and remove pressure nozzle from wand.
Start the machine and allow it to run until antifreeze runs
from the end of the wand. Place wand into float tank and
circulate the solution through system for several minutes.
Open and close the trigger gun several times to circulate
antifreeze through the unloader valve system. Also draw
antifreeze through the detergent inlet line to antifreeze the
detergent system. For added protection after adding an-
tifreeze, disconnect the pressure hose from machine
and remove the coil drain plug (refer to Component
Identification illustration 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.
Figure 8 - Detergent Metering System
80 70 60 50 40 30 20
.013 .028 .040 .070 .098 .128 .161
.02%
.05%
1%
2%
4%
6%
8%
10%
12%
1/400
1.200
1/100
1/50
1/25
1/16
1/12
1/10
1/8
RATIO % DETERGENT CONCENTRATION
DRILL NO.
DRILL SIZE
DETERGENT/WATER
1/8 12%
1/10 10%
1/12 8%
1/16 6%
1/25 4%
1/50 2%
1/100 1%
1/200 .05%
1/400 .02%
DRILL NO. 80 70 60 50 40 30 20
DRILL SIZE .013 .028 .040 .070 .098 .128 .161
DETERGENT CONCENTRATION
DETERGENT/WATER
RATIO %

12 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
MAINTENANCE
WARNING: Unauthorized machine modification or use
of non-approved replacement parts may cause personal
injury and/or property damage and will void the man-
ufacturer warranty.
Pump
Use Hotsy Pump Oil P/N 315068 for pump crankcase.
Crankcase must be filled to the full mark on the dipstick or to
center of sight glass window found on the rear of the pump.
(Refer to Figure 9) 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 of operation,
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 manufac-
turers 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 Stor-
age for details.
Pump Motor
On a yearly basis, oil pump motor per instructions on mo-
tor nameplate.
NOTE:Some motors may be equipped with permanently
lubricated bearings and will not require additional lu-
brication.
Gas Burner
It is recommended that the gas burner be serviced yearly
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 26.
Unloader Valve
WARNING:The unloader 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 refer
to Figure 28.
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 heat-
ing 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.
Figure 9 - Pump Lubrication
Dipstick
Sight Glass
(on rear of pump)
Oil Fill

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 13
Hotsy 1800 • 97-6244 Rev. 7/06
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
PRESSURE
WASHER WILL
NOT RUN
Pump switch in OFF position. Place switch in ON position.
Power supply disconnected. Connect power supply.
Fuse blown or circuit breaker
tripped in electrical supply line.
Replace fuse or reset circuit breaker. Use only
circuits of adequate capacity.
Motor circuit overload tripped. Allow sufficient time for motor to cool down.
Place pump switch in ON position.
PRESSURE
WASHER RUNS
BUT WON’T SPRAY
Trigger of trigger gun released. Squeeze trigger.
Water supply not turned on. Open water supply valve.
Clogged pressure nozzle. Clean pressure nozzle opening.
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 SPRAY
PRESSURE AT
NOZZLE
Inadequate water supply. Fully open faucet. Check for kinked or damaged
hose. Use 5/8" minimum hose. Check for debris
clogging inlet screen.”
Partially clogged or damaged
pressure nozzle.
Clean or replace.
Air being drawn through deter-
gent inlet line.
Refill detergent container. Ensure that pick-up
screen is fully immersed.
UNEVEN SPRAY
PATTERN
Partially clogged or damaged
pressure nozzle.
Clean or replace.
PRESSURE WASHER
WILL NOT PRODUCE
HOT WATER WATER
(CONTINUED)
Burner switch in OFF position. Place switch in ON position.
Gas valve switch in OFF
position.
Place switch in ON position.
Inadequate fuel supply. Check fuel supply.
Pump switch turned off. Pump must be running before burner will light.
TROUBLESHOOTING GUIDE

14 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
PRESSURE
WASHER WILL
NOT PRODUCE
HOT WATER
(continued)
Inadequate water supply. Fully open faucet. Check for kinked or damaged
hose. Use 5/8" minimum hose. Check for debris
clogging inlet screen.
Trigger of trigger gun released. Squeeze trigger. Water must be spraying for
burner to light.
Thermostat set too low, or defec-
tive.
Raise thermostat setting. Replace if defective.
Manual gas valve not open. Turn ON gas valve.
Defective gas valve. Replace gas valve.
POOR OR NO
DETERGENT FLOW
Inadequate detergent supply. Refill detergent container. Ensure that pick-up
screen is fully immersed.
Detergent screen or hose
clogged.
Clean. Always start with a a clean detergent
container.
Clogged detergent injector check
valve.
Clean check valve at detergent injector.
POOR CLEANING Improper detergent concentra-
tion or mixing.
Mix detergent per manufacturer's instructions. En-
sure that powdered detergents are fully dissolved.
Wrong detergent for the applica-
tion.
Select appropriate detergent.
Detergent valve not opening. Check that handle or knob is not slipping on shaft.
UNLOADER
CYCLES WHEN
TRIGGER GUN
IS OPENED OR
CLOSED
Air in system. Open and cloase trigger gun several times.
Unloader defective. Replace if defective.
Water leak between unloader
valve and trigger gun.
Check fittings, hose, and trigger gun for leaks.
Repair or replace.
BURNER SMOKES
OR HAS
OBNOXIOUS ODOR
Stack restriction. See Venting under Installation.
PRESSURE RELIEF
VALVE IS LEAKING
Excessive pressure due to de-
fective unloader valve.
Replace unloader valve.
Defective relief valve. Replace relief valve.
Dirty relief valve. Clean relief valve seat.
TROUBLESHOOTING GUIDE

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 15
Hotsy 1800 • 97-6244 Rev. 7/06
1800 GAS-FIRED SERIES OPTIONAL EQUIPMENT
835525 Draft Diverter
When ordering from your dealer, please provide the following:
Model Number: _____________________Release:___________
Machine Serial Number: ________________________________
Component Part Number: _______________________________
Description: __________________________________________
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 or
by calling 1-800-525-1976.

16 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
EXPLODED VIEW
For
Detail See
Control Box
Illus.
For
Detail See
Float Tank
Illus.
4
11
8
7
6
9
2
3
22
19
14
15
16
3
17
13
12
18
5
20
26
21
23
25
24
28
1
27
45
For
Detail See
Pump Assy.
Illus.
48
49
50
3
3
44
48
10
47
39
51,52,53
Models 1812SS,
1812SS-208, 1852SS,
1852SS-208

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 17
Hotsy 1800 • 97-6244 Rev. 7/06
EXPLODED VIEW
To Coil
34
33
32
41
42
43
31
30
29
3
37
46
10
54
55

18 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
ITEM PART NO. DESCRIPTION QTY
1 104900 Frame Assembly 1
2 703108 Nut, 3/8" Flange 4
3 630009 Bolt, 1/4" x 1/2" Hex 20
4 104908 Panel, 1800 Skirt 1
5 867395 Hose, 3/8" Push-On 30"
6 See Control Panel Assembly, Page 22 1
7 104907 Cover, Elec. Box 1
8 815329 Bushing, 3/4" Snap, P/N 2140 2
9 11-10480 Label, Warning 1
10 90-4000 Washer, 1/4" 33
11 914904 Label, Plate Alum, 5" x 11" 1
12 104951 Coil Weld, Gas, 22" 1
936688 Fender Washer, 5/16" 4
703107 Whiz Nut, 5/16" 4
13 824115 Clip, Insulation Retainer 4
14 104926 Top Hat Assy, 24" x 10" 1
15 268015 Insulation,
23.50D x 10.75 ID x 1/2" 1
16 104928 Ring, Insulation Retainer 1
17 268016 Insulation, 69.0 x 29.75 x 1/2" 1
18 104906 Coil Tank Assy., Page 24 1
936688 Fender Washer, 5/16" 4
703107 Whiz Nut, 5/16" 4
19 104919 Side, Cabinet Left 1
20 See Coil Outlet Assembly
21 785966 Motor 208V 1 PH (1812SS-208,
1852SS-208) 1
785108 Motor 230V 1 PH (1812SS,
1852SS) 1
784644 Motor 208V 3 PH (1822SS-208,
1862SS-208) 1
784654 Motor 230V/460V 3 PH (1822SS,
1825SS, 1862SS, 1855SS) 1
784668 Motor 575V 3 PH (1836SS,
1856SS) 1
826029 Metal Strain, 1" (All Motors) 1
22 612984 Bolt, 3/8" x 1" NC HH 4
23 780562 Washer, 3/8" SAE, Flat 8
24 Pump Slider, Please See Pump Assy., Page 28
25 703134 Nut, 1/2" Hex, NC 1
26 375584 Float Tank Assembly 1
ITEM PART NO. DESCRIPTION QTY
27 780455 Washer, 1/2" Flat 1
28 613025 Bolt, 1/2" x 5" NC HH Tap 1
29 919794 Pulley, 2BK 67H (1812SS,
1812SS-208, 1822SS,
1822SS-208, 1825SS, 1836SS)1
875446 Pulley, 2BK 80H (1852SS,
1852SS-208, 1855SS, 1852SS,
1856SS, 1862SS, 1862SS-208) 1
30 615401 Belt, BX35 (1812SS-208,1822SS,
1822SS-208, 1825SS,
1836SS,1852SS-208) 2
616006 Belt, BX32 (1812SS) 2
615400 Belt, BX37 (1862SS-208,1855SS,
1856SS, 1862SS) 2
31 919521 Pulley, 2BK40H (1812SS-208,
1812SS, 1822SS, 1822SS-208,
1852SS, 1852SS-208, 1862SS,
1862SS-208, 1855SS, 1825SS,
1856SS, 1836SS) 1
32 707284 Hose, 3/8" x 48", 2 Wire,
Pressure Loop 1
33 754717 Tee, 1/2" Fem, STL, Pipe 1
34 698256 Nipple, Pipe, 1/2" x 4-1/2" 1
35 878961 Latch, Spring Flush Head 2
36 926598 Rivet, 1/8" x 1/4", POP, AL 8
37 95-07104916 Cover, Cabinet 1
38 875477 Screw, 10-32" x 1/2" SlotPan16
39 859808 Grommet, 1-5/16" Rubber 3
40 90-20047 Nut, 10/32" ESNA 16
41 104902 Panel, Back 1
42 815182 Bushing, H x 1-3/8" 1
43 815183 Bushing, H x 25mm 1
44 See Pump Assembly - Page 28 1
45 780482 Washer, 1/2", Lock 1
46 715755 Plug, 1/2", Hex Head 1
47 185083 Washer, 10 x SAE Zinc 32
48 615841 Screw, Whiz, 1/4" x 3/4" 4
EXPLODED VIEW
PARTS LIST

1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL 19
Hotsy 1800 • 97-6244 Rev. 7/06
ITEM PART NO. DESCRIPTION QTY
49 5-1352 Box, Electrical 1
5-1353 Lid, Electrical Box1
6-05171 Strain Relief, 1" 1
50 645891 Service Cord, 6/3 (1812SS,
1812SS-208, 1852SS,
1852SS-208) 37"
645893 Service Cord, 8/4 (1822SS,
1822SS-208, 1862SS,
1862SS-208) 37"
825985 Service Cord,12/4 (1825SS,
1836SS, 1855SS, 1856SS) 37"
51 615841 Screw, 5/16" x 3/4" Whiz Loc 2
52 703107 Nut, 5/16" Flange, Whiz Loc 2
53 375435 Holder, Wand, Weldment 1
54 2-01088 Gasket, 1/32" x 3/4" x 25.5"
Neoprene 1
55 2-01089 Gasket, 1/32" x 3/4" x 20.5"
Neoprene 1
Not Shown
EXPLODED VIEW
PARTS LIST (CONTINUED)

20 1800 SERIES PRESSURE WASHER OPERATOR’S MANUAL
Hotsy 1800 • 97-6244 Rev. 7/06
ITEM PART NO. DESCRIPTION QTY.
1 691867 Trigger Gun, Hotsy 1
2 915786 Nipple, 1/4" x 1/4" NPT ST Male1
3 826169 Coupler, 1/4" Female, Brass 2
4 878917 Wand, Side Grip 1
5 4-02043450C Hose, 3/8" x 50',
2 Wire 1
6 799007 Nozzle, 7.5 Red
(5.9 GPM @ 2500 PSI) 1
799003 Nozzle, 5.5 Red
(4.8 GPM @ 3000 PSI) 1
HOSE & TRIGGER GUN
ASSEMBLY & PARTS LIST
ITEM PART NO. DESCRIPTION QTY.
7 799019 Nozzle, 7.5 Yellow
(5.9 GPM @ 2500 PSI) 1
799015 Nozzle, 5.5 Yellow
(4.8 GPM @ 3000 PSI) 1
8 799031 Nozzle, 7.5 White
(5.9 GPM @ 2500 PSI) 1
799027 Nozzle, 5.5 White
(4.8 GPM @ 3000 PSI) 1
9 826176 Coupler, 3/8" Female, Brass 1
1
2
6,7,8
5
4
3
3
9