Hotsy 981SS Service manual

97-6574
SERIAL NUMBER:
DATE PURCHASED:
FOR SALES AND SERVICE, PLEASE CONTACT:
OPERATING INSTRUCTIONS
AND PARTS MANUAL
Thank you for purchasing a Hotsy Pressure Washer.This manual covers the operation and mainte-
nance of your pressure washer. All information in this manual is based on the latest product informa-
tion available at the time of printing. Hotsy, Inc. reserves the right to make changes at any time without
incurring any obligation.
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!
900/1400
GAS-FIRED SERIES
NOTE: This manual is intended for use with the following models only:
981SS 962SS 1424SS
982SS 962SS-208 1425SS
991SS 964SS 1452SS
991SS-208 969SS 1452SS-208
992SS 1411SS 1462SS
992SS-208 1412SS 1462SS-208
994SS 1421SS 1464SS
995SS 1421SS-208 1469SS
952SS 1422SS
952SS-208 1422SS-208
®
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981SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 25 Amps
●Machine Weight: 490 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
982SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 25 Amps
●Machine Weight: 490 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
991SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 16 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
991SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 18 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
992SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 16 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
992SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 18 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
994SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 460Vac/60Hz/3Ph
●Total Machine Amperage: 8 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
995SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 2000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 5.0
●Machine Voltage: 460Vac/60Hz/3Ph
●Total Machine Amperage: 8 Amps
●Machine Weight: 485 Lbs.
●Shipping Weight: 545 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"

952SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 27 Amps
●Machine Weight: 500 Lbs.
●Shipping Weight: 560 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"
952SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 208Vac/60Hz/1Ph
●Total Machine Amperage: 28 Amps
●Machine Weight: 500 Lbs.
●Shipping Weight: 560 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"
962SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 16 Amps
●Machine Weight: 495 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"
962SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 19.5 Amps
●Machine Weight: 495 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
964SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 460Vac/60Hz/3Ph
●Total Machine Amperage: 11.5 Amps
●Machine Weight: 495 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
969SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.8 GPM/228 GPH
●Pump Pressure At Pump Head: 2300 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 6.2
●Machine Voltage: 575Vac/60Hz/3Ph
●Total Machine Amperage: 7 Amps
●Machine Weight: 495 Lbs.
●Shipping Weight: 550 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"

1422SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 24 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1422SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 24 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"
1424SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 460Vac/60Hz/3Ph
●Total Machine Amperage: 12 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1425SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 460Vac/60Hz/3Ph
●Total Machine Amperage: 12 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1411SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 34 Amps
●Machine Weight: 550 Lbs.
●Shipping Weight: 610 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1412SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 34 Amps
●Machine Weight: 550 Lbs.
●Shipping Weight: 610 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1421SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 25 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"
1421SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: LP Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 24 Amps
●Machine Weight: 545 Lbs.
●Shipping Weight: 605 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18",
Height=50"

1462SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 8.2
●Machine Voltage: 208Vac/60Hz/3Ph
●Total Machine Amperage: 23 Amps
●Machine Weight: 555 Lbs.
●Shipping Weight: 615 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1464SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 7.5
●Machine Voltage: 460VAC/60Hz/3Ph
●Total Machine Amperage: 11 Amps
●Machine Weight: 555 Lbs.
●Shipping Weight: 615 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1469SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 8.2
●Machine Voltage: 575VAC/60Hz/3Ph
●Total Machine Amperage: 10 Amps
●Machine Weight: 555 Lbs.
●Shipping Weight: 615 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1452SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 8.2
●Machine Voltage: 230Vac/60Hz/1Ph
●Total Machine Amperage: 34 Amps
●Machine Weight: 560 Lbs.
●Shipping Weight: 620 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1452SS-208 SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 332,000 BTU/Hr.
●Motor Hp: 8.2
●Machine Voltage: 208Vac/60Hz/1Ph
●Total Machine Amperage: 36.5 Amps
●Machine Weight: 555 Lbs.
●Shipping Weight: 615 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"
1462SS SPECIFICATIONS
●Pump Volume At Pump Head: 3.9 GPM/234 GPH
●Pump Pressure At Pump Head: 3000 PSI
●Burner Type: Natural Gas Fired, 350,000 BTU/Hr.
●Motor Hp: 8.2
●Machine Voltage: 230Vac/60Hz/3Ph
●Total Machine Amperage: 22.5 Amps
●Machine Weight: 555 Lbs.
●Shipping Weight: 615 Lbs.
●Exhaust Stack Size: 8"
●Machine Dimensions: Length=45", Width=18", Height=50"

CONTENTS
6
97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
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.
Introduction & Important Safety Information 7-8
Component Identification 9
Assembly Instructions 10
Installation Instructions 11-12
Operation Instructions 13-14
Shutdown Instructions 15
Storage 15
Maintenance 16
Troubleshooting 17-19
Exploded Views 20-21
Exploded View Parts List 22-23
Burner Assembly & Parts List 24-25
Pump Assembly & Parts List 26-27
Float Tank Assembly & Parts List 28-29
Control Panel & Parts List 30-31
Pump, Detail Exploded View & Parts List 32-34
Hose & Spray Gun Assembly & Parts List 35
Trigger Gun, Detail Exploded View & Parts List 36-37
Specifications 38
Wiring Diagrams 39-46
Warranty

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
7
PRESSURE WASHER OPERATOR’S MANUAL
INTRODUCTION & IMPORTANT SAFETY INFORMATION
Owner/User Responsibility
The owner and/or user must have an understanding of
the manufacturer’s operating instructions and warnings
before using this Hotsy pressure washer.Warning infor-
mation should be emphasized and understood. If the
operator is not fluent in English, the manufacturer’s in-
structions 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.
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.
IMPORTANT SAFETY
INFORMATION
CAUTION:To reduce the risk of
injury, read operating instruc-
tions carefully before using.
1.Read the owner's manual
thoroughly. Failure to follow in-
structions could cause mal-
function of the machine and
result in death, serious bodily
injury and/or property dam-
age.
2. Know how to stop the machine and bleed pres-
sures quickly. Be thoroughly familiar with the con-
trols.
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
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
KEEP WATER SPRAY
AWAY FROM
ELECTRICAL WIRING.
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 ma-
chine to a UL grounded re-
ceptacle 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 disconnect power before servicing.
7. Grip cleaning wand securely with both hands be-
fore 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 se-
rious injury and possible ampu-
tation.
8. High pressure developed by
these machines can cause
personal injury or equipment
damage. Use caution when
operat-
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.
11. When the machine is working,
do not cover or place in a
closed
space where ventilation is sufficient.
12. Do not operate with the spray gun in the off posi-
tion for extensive periods of time as this may cause
damage to the pump.
13. Protect from freezing.
14. Be certain all quick coupler fittings are secured be-
fore 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 sup-
ply.
WARNING
PROTECTIVE EYEWEAR
AND CLOTHING MUST
BE WORN.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
8
IMPORTANT SAFETY INFORMATION
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 opera-
tion.
18. The best insurance against an accident is precau-
tion and knowledge of the machine.
19. Do not operate this product when fatigued or un-
der the influence of alcohol or drugs. Keep operat-
ing 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. In-
stall 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
manual.
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
supplier immediately.
30. This machine must be attended during operation.
31. A draft hood shall be installed if this machine is
going to be permanently installed and vented to
the outside of the building.
Example Of Down
Draft Diverter
For Gas Fired
Machines

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
9
PRESSURE WASHER OPERATOR’S MANUAL
COMPONENT IDENTIFICATION
Burner
Exhaust Vent
Thermostat
Pump switch
High Pressure
Nozzle
Wand
High Pressure
Hose
Detergent Bucket
(not included)
Thermal
Rupture Disk
Burner Switch
Garden Hose
(not included)
Trigger Gun
Detergent
Control
Nozzles
Pump — Develops high pressure by pumping water
volume through nozzle.
Spray Gun — Controls the application of water and
detergent onto cleaning surface with trigger device. In-
cludes safety latch.
Detergent MeteringValve — Controls detergent mix-
ture.
Wand — Must be connected to the spray gun.
High Pressure Hose — Connect one end to water
pump discharge nipple and the other end to spray gun.
Pressure Nozzle — Inserted into wand quick coupler
to develop pressure
Adjustable Thermostat — Prevents water tempera-
ture from exceeding high temperatures. Is not used to
maintain constant temperature setting.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
10
ASSEMBLY INSTRUCTIONS
Unpacking
Unpack carefully. Wear safety glasses or goggles while
unpacking, assembling or operating pressure washer. If
there are missing components or hidden damage imme-
diately contact distributor or carrier concerning discrep-
ancies.
1. Cut strapping band from pressure washer and pal-
let.
2. Remove pressure washer from pallet.
Parts Included
•Pressure Washer
•Pressure Hose
•Hose Hanger
•Wand
•Wand Holder
•Parts Box Containing:
■Pressure Nozzles (3 ea.)
■Trigger Gun
•Operating Instructions and Parts Manual
Tools Required
•10" Adjustable Crescent Wrenches (2 ea.)
•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.
3. Assemble wand components as shown.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.
Quick Disconnect Plug Wand
Quick
Disconnect
Trigger Gun
Pressure Hose
Hose Hanger
Pocket On
Coil Tank
Rupture Disk
Pressure Hose

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
11
PRESSURE WASHER OPERATOR’S MANUAL
INSTALLATION INSTRUCTIONS
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 tempera-
tures, 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 be-
tween the wash area and the pressure washer to prevent
direct spray from the wand coming in contact with the pres-
sure washer. Moisture reaching the equipment will reduce
the pressure washer’s service life. All installations should
comply with the local codes covering such installations.
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 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.
IMPORTANT: A draft diverter shall be installed.
INSTALLER UNE HOTTE DETIRAGE.
IMPORTANT: All venting must be in accordance with
applicable federal and state laws, and local ordi-
nances. Consult local heating contractors.
IMPORTANT: Not suitable for connection to Type B
gas vent if the stack temperature exceeds 243°C
(470°).
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 locations or areas where
exhaust fans may cause an insufficient supply of oxy-
gen. 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 pres-
sure washer so that the flue will be as straight as pos-
sible 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. A draft diverter will permit proper upward flow
of exhaust flue gases.
Water Supply
Connect water supply hose to water inlet. 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 ex-
ceed 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 sup-
ply a minimum of 525,000 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.
On/Off
Switch
Outlet View
Line to
Pilot Light
Manifold
Pressure
Adjustment
Screw Under
Cap
Inlet View

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
12
Gas Valve
The ideal incoming gas pressure is 11 w.c.i. (water col-
umn inches) minimum 6 w.c.i., maximum 14 w.c.i. or 1/
2 psig. The correct operating manifold pressure for natu-
ral gas is 3.5 w.c.i. The operating manifold pressure for
propane gas is 11 w.c.i. The gas valve pressure regula-
tor 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 ad-
justment instructions provided with your replacement
valve.
INSTALLATION INSTRUCTIONS
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 elec-
trical supply. Do not stand in water while connecting
and disconnecting electrical supply. If it should mal-
function 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 ordi-
nances.
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.
Extension Cords: Do not use extention cords with this
equipment.
WARNING: To reduce the risk of electrocution, keep
all connections dry and off the ground.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
13
PRESSURE WASHER OPERATOR’S MANUAL
OPERATION INSTRUCTIONS
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.
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.
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 ini-
tial start-up, turn on the water supply, start the pump
by pressing the pump ON switch, and hold the wand
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 wand and turn on
water supply, and start the pump by pressing the
pump ON switch. Hold the wand trigger open and al-
low water to run from the end of the wand until clear.
6. Install the pressure nozzle on end of wand, refer to
illustration below.
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, re-
fer to figure above. 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 assem-
bly, 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.
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. 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.
NE PAS DIRIGER LE JET DE SORTIEVERS 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.
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
10 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.
Manual Trigger Lock
Pressure Nozzle

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
14
OPERATION INSTRUCTIONS
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.
NE PAS DIRIGER LE JET DE SORTIEVERS D’AUTRES
PERSONNES. CONFIER L’UTILISATION DE CE
MATÉRIEL À UN OPÉRATEUR QUALIFIÉ.
1. Insert detergent inlet line into container of mixed
detergent. Open detergent ON/OFF valve. The
detergent will be pulled automatically into the sys-
tem. Allow detergent to reach end of wand before
proceeding to step 3.
2. Select pressure nozzle with spray pattern that
matches your cleaning needs. Engage manual trig-
ger lock and install selected nozzle.
3. 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.
4. 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.
5. 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.
6. 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.
7. Small parts should be washed in a basket and larger,
lightweight parts should be clamped down so the
pressure does not push them away.
8. 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 deter-
gent from dripping onto a rinsed area. For the best
results, contact your Hotsy dealer to help you select
the best detergent for your application.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
15
PRESSURE WASHER OPERATOR’S MANUAL
SHUTDOWN INSTRUCTIONS
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 INSTRUCTIONS
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
solvent 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 an-
tifreeze runs from the end of the wand. Place wand
into float tank and circulate the solution through sys-
tem 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 antifreezing, dis-
connect the pressure hose from machine and remove
the coil drain plug (refer to Component Identifica-
tion illustration for location). After coil has drained,
replace pressure hose and coil drain plug. If the pres-
sure 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.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
16
MAINTENANCE
WARNING: Unauthorized machine modification or use
of non-approved replacement parts may cause per-
sonal injury and/or property damage and will void the
manufacturer 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. 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, which-
ever 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 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 perma-
nently lubricated bearings and will not require addi-
tional lubrication.
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.
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 set-
ting may cause personal injury and/or property dam-
age, and will void the manufacturer warranty.
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.
Dipstick
Sight Glass
(on Rear of Pump)
Oil Fill

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
17
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
TROUBLESHOOTING GUIDE
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 detergent
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.
(
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.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
PRESSURE WASHER Troubleshooting Guide
18
TROUBLESHOOTING
TROUBLESHOOTING GUIDE
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 defective. 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 clean detergent
container.
Clogged detergent injector check
valve.
Clean check valve at detergent injector.
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.
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 close 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 leaking. Excessive pressure due to
defective unloader valve.
Replace unloader valve.
Defective relief valve. Replace relief valve.
Dirty relief valve. Clean relief valve seat.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
19
PRESSURE WASHER Troubleshooting Guide
TROUBLESHOOTING
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.

97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
OPERATOR’S MANUAL
PRESSURE WASHER
20
2
3
4
5
6
8
1
11
17
19
15
14,70
16,21
26
25
24
27
7
54 12
13
11 25
26
910 28
23
30
37
56
32
31
22
29
For
Detail See
Float Tank
Illus.
37
39
62
27
27
34
33
For
Detail See
Burner
Assy.
35
29
38
EXPLODED VIEW
59
60
20
66
61
60
65
57
26
Optional
Hose Reel
See Float
Tank Illus.
For Detail
26
58
18
51
75
76
25 26 71
77
78
80 79