Master H.S.I. Series User manual

R
Heater Sizes: 30,000 70,000 90,000 150,000 BTU/Hr
IMPORTANT
Read and understand this manual before assembling, starting or servicing
heater. Improper use of heater can cause serious injury. Keep this manual
for future reference.
PORTABLE
FORCED
AIR HEATERS
OWNER’S MANUAL

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099605
Safety Information.........................................................................3
Product Identification .................................................................... 4
Unpacking......................................................................................5
Assembly .......................................................................................5
Theory of Operation ......................................................................6
Fuels ..............................................................................................6
Ventilation .....................................................................................7
Operation .......................................................................................7
Storage ........................................................................................... 8
Preventative Maintenance Schedule..............................................8
Troubleshooting.............................................................................9
Service Procedures ........................................................................10
Upper Shell Removal ..............................................................10
Fuel Filter (30/70,000 BTU/Hr Models)................................. 10
Fuel Filter (90,000 BTU/Hr Model) ....................................... 11
Fuel Filter (150,000 BTU/Hr Model) .....................................11
Spark Plug (30,000 BTU/Hr Model) ...................................... 12
Spark Plug (70/90/150,000 BTU/Hr Models).........................13
Air Output, Air Intake, and Lint Filters .................................. 14
Pump Pressure Adjustment ..................................................... 14
Nozzle (30,000 BTU/Hr Model).............................................15
Nozzle (70/90,000 BTU/Hr Models) ...................................... 16
Nozzle (150,000 BTU/Hr Model)...........................................17
Pump Rotor .............................................................................18
Fan........................................................................................... 19
Specifications................................................................................. 19
Wiring Diagrams ...........................................................................20
Illustrated Parts Breakdown and Parts List ...................................22
30,000 BTU/Hr Model............................................................22
70,000 BTU/Hr Model............................................................24
90,000 BTU/Hr Model............................................................26
150,000 BTU/Hr Model..........................................................28
Wheels and Handles (90/150,000 BTU/Hr Models)...............30
Accessories ....................................................................................31
Warranty and Repair Service.........................................................Back Cover
CONTENTS SECTION PAGE

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SAFETY
INFORMATION WARNINGS
IMPORTANT: Read this owner’s manual carefully and completely
before trying to assemble, operate, or service this heater. Improper
use of this heater can cause serious injury or death from burns, fire,
explosion, electrical shock, and carbon monoxide poisoning.
Carbon Monoxide Poisoning: Early signs of carbon monoxide poisoning
resembletheflu,with headaches, dizziness, or nausea. If youhavethesesigns,the
heater may not be working properly. Getfresh air atonce!Have heater serviced.
Some people are more affected by carbon monoxide than others. These include
pregnant women, persons with heart or lung disease or anemia, those under the
influence of alcohol, and those at high altitudes.
Make certain you read and understand all warnings. Keep this manual for
reference. It is your guide to safe and proper operation of this heater.
• Use only kerosene or No. 1 fuel oil to avoid risk of fire or explosion. Never
use gasoline, naphtha, paint thinners, alcohol, or other highly flammable
fuels.
• Never use heater where gasoline, paint thinner, or other highly flammable
vapors are present.
• Follow all local ordinances and codes when using heater.
• Use only in well-vented areas. Provide at least a three-square foot (2800
square cm) opening of fresh, outside air for each 100,000 BTU/Hr of rating.
• Use only in places free of flammable vapors or high dust content.
• Use only with the electrical voltage and frequency specified on model plate.
• Use only a three-prong, grounded (earthed) extension cord.
• Minimum heater clearances from combustibles:
Outlet: 8 Ft. (250 cm) Sides, Top, and Rear: 4 Ft. (125 cm)
• Locate heater on a stable and level surface while hot or running or a fire may
occur.
• When moving or storing heater, keep heater in a level position or fuel
spillage may occur.
• Keep children and animals away from heater.
• Unplug heater when not in use.
• When used with thermostat, heater may start anytime.
• Never use heater in living or sleeping areas.
• Never block air inlet (rear) or air outlet (front) of heater.
• Never move, handle, refuel, or service a hot, operating, or plugged-in heater.
• Never attach duct work to front or rear of heater.
DANGER
Carbon monoxide poisoning may lead to death!

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099605
Fuel Cap
Lower
Shell
Power Cord
Upper Shell
Figure 3 - 150,000 BTU/Hr Model
Handle
Fuel Cap
Lower Shell
Side Cover
Fuel Tank
Figure 1 - 30/70,000 BTU/Hr Models
Side Cover
Fuel Tank
Lower
Shell
Fuel Cap
Fan Guard
Upper Shell
PRODUCT
IDENTIFICATION Upper Shell
Hot Air Outlet
Hot Air
Outlet
Hot Air
Outlet
Air Filter
End Cover
Fan Guard
Power Cord
Flame-Out
Control Reset
Button
(EDI Model Only)
Figure 2 - 90,000 BTU/Hr Model
Fuel
Tank
Fan Guard
Air Filter
End Cover
Flame-Out
Control Reset Button
(EDI Model Only)
Flame-Out Control
Reset Button
(EDI Model Only)
Power Cord

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099605
UNPACKING 1. Remove all packing items applied to heater for shipment.
2. Remove all items from carton.
3. Check items for any shipping damage. If heater is damaged, promptly inform
dealer where you bought heater.
ASSEMBLY
(For 90,000 and 150,000
BTU/Hr Models Only)
These models are furnished with wheels and handles. Wheels, handles, and the
mounting hardware are found in the shipping carton.
Tools Needed
• Medium Phillips Screwdriver
• 3/8" Open or Adjustable Wrench
• Hammer
1. Slide axle through wheel support frame. Install wheels on axle.
IMPORTANT: When installing wheels, point extended hub of wheels toward
wheel support frame (see Figure 4).
2. Place cap nuts on axle ends. Gently tap with hammer to secure.
3. Placeheateronwheelsupportframe.Makesureairinletend(rear)ofheaterisover
wheels. Line up holes on fuel tank flange with holes on wheel support frame.
4. Place front handle and rear handle on top of fuel tank flange. Insert screws
through handles, fuel tank flange, and wheel support frame. Attach nut finger
tight after each screw is inserted.
5. After all screws are inserted, tighten nuts firmly.
Figure 4 - Wheel and Handle Assembly, 90/150,000 BTU/Hr Models Only
Screw
Fuel
Tank
Flange
Wheel
Support
Frame
Wheel
Cap Nut
Nut
Extended
Hub
Air
Inlet
Rear
Handle
Hot Air
Outlet
Front Handle
Axle

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THEORY OF
OPERATION The Fuel System: The air pump forces air through the air line. The air is then
pushed through the burner head nozzle. This air causes fuel to lift from the tank. A
fine mist of fuel is sprayed into the combustion chamber.
The Air System: The motor turns the fan. The fan pushes air into and around
the combustion chamber. This air is heated and provides a stream of clean, hot air.
The Ignition System: The electronic ignitor sends voltage to the spark plug.
The spark plug ignites the fuel and air mixture.
The Flame-Out Control System (EDI Models Only): This system causes
the heater to shut down if the flame goes out.
Fan
Fuel
Filter
Air For Fuel
System Air For Combustion And Heating Fuel
Spark
Plug
Combustion
Chamber Intake
Air
Filter
Motor Air Pump
Air line
To Burner Electronic Ignitor
Burner
Head
Clean
Heated
Air Out
Cool
Air
In
Output
Air
Filter
Nozzle
Fuel
Tank
Figure 5 - Cross Section Operational View
FUELS
Do not use heavy fuels such as No. 2 fuel oil or No. 2 Diesel. Using heavy fuels
will result in:
• clogged fuel filter and nozzle
• carbon build up on spark plug
• use of non-toxic anti-icer in fuel during very cold weather
IMPORTANT: Use a KEROSENE ONLY container. Be sure storage container is
clean. Foreign matter such as rust, dirt, or water will cause the flame-out control to
shut down heater (EDI models only). Foreign matter may also require you to clean
fuel system often.
WARNING
Use only kerosene or No. 1 fuel oil to avoid risk of fire or
explosion. Never use gasoline, naphtha, paint thinners,
alcohol or other highly flammable fuels.

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VENTILATION
OPERATION
Continued
Figure 6 - Flame-Out Control Reset
Button, 30/70,000 BTU/Hr EDI Models Figure 7 - Flame-Out Control Reset
Button, 90,000 BTU/Hr EDI Model
Provide a fresh air opening of at least three square feet (2800 square cm) for each
100,000 BTU/Hr rating. Provide extra fresh air if more heaters are being used.
Example: A 150,000 BTU/Hr heater requires one of the following:
• a two-car garage door raised six inches (15.24 cm)
• a single-car garage door raised nine inches (22.86 cm)
• two, thirty-inch (76.20 cm) windows raised twelve inches (30.48 cm)
WARNING
Review and understand the warnings in the Safety
Information Section. They are needed to safely operate this
heater. Follow all local codes when using this heater.
To Start Heater
1. Follow all ventilation and safety information.
2. Fill fuel tank with kerosene or No. 1 fuel oil.
3. Attach fuel cap.
4. Plug power cord of heater into standard 230 volt/50 hertz, grounded (earthed)
outlet. Use an extension cord if needed. Use only a three-prong, grounded
(earthed) extension cord.
Extension Cord Wire Size Requirements
Up to 100 feet (30.5 meters) long, use 16 AWG (1.0 mm2) conductor
101 to 200 feet (30.6 to 61 meters) long, use 14 AWG (1.5 mm2) conductor
Heater will start when power cord is plugged into outlet. If not, push in flame-
out control reset button (EDI models only; see Figures 6 thru 8).
WARNING
Follow the minimum fresh, outside air ventilation
requirements. If proper fresh, outside air ventilation is not
provided, carbon monoxide poisoning can occur. Provide
proper fresh, outside air ventilation before running heater.
Flame-Out Control
Reset Button Flame-Out Control
Reset Button

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099605
OPERATION
Continued
Figure 8 - Flame-Out Control Reset Button, 150,000 BTU/Hr EDI Model
Continued
PREVENTATIVE
MAINTENANCE
SCHEDULE
Item How Often How To
Fuel tank Flush every 150-200 hours See Storage above.
of operation or as needed.
Air output and Replace every 500 hours of See Air Output, Air Intake,
lint filters operation or once a year. and Lint Filters, page 14.
Air intake Wash and dry with soap and See Air Output, Air Intake,
filter water every 500 hours of and Lint Filters, page 14.
operation or as needed.
Fuel filter Clean twice a heating season See Fuel Filter, pages 10
or as needed. and 11.
To Stop Heater
1. Unplug power cord from outlet.
To Restart Heater
1. Wait 2 minutes after stopping heater.
2. Repeat steps under To Start Heater, page 7.
STORAGE 1. Drain fuel tank.
Note: Some models have drain plug on underside of fuel tank. If so, remove
drain plug to drain all fuel. If heater does not have drain plug, drain fuel
through fuel cap opening. Be sure all fuel is removed.
2. Replace drain plug if used.
3. Add one gallon (4 liters) of clean kerosene to fuel tank.
4. Attach fuel cap.
5. Move heater forwards and backwards to stir fuel.
6. Remove fuel cap or drain plug and drain fuel tank. Be sure all fuel is removed.
7. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel.
8. Store heater in dry place. Make sure storage place is free of dust and corrosive
fumes.
IMPORTANT: Do not store kerosene over summer months for use during next
heating season. Using old fuel could damage heater.
Flame-Out
Control
Reset Button
(Fan Guard
Removed)
WARNING
Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.

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Continued
Item How Often How To
Spark plug Clean and regap every 600 See Spark Plug, pages 12 and 13.
hours operation or replace
as needed.
Fan blades Clean every season or as needed. See Fan, page 19.
Motor Not required/permanently lubricated
TROUBLE-
SHOOTING
OBSERVED FAULT POSSIBLE CAUSE REMEDY
Wrong pump pressure
Dirty air output, air intake,
and lint filters
Dirty fuel filter
Dirt in nozzle
Dirty photocell lens
Bad flame-out control
Heater ignites, but
flame-out control
shuts off heater after
a short period of time
(EDI models only).
See Pump Pressure
Adjustment, page 14.
See Air Output, Air Intake
and Lint Filters, page 14.
See Fuel Filter, pages 10
and 11.
See Nozzle, pages 15 thru
17.
Clean photocell lens.
Replace flame-out control.
Heater will not
ignite, but motor runs
for a short period of
time.
Wrong pump pressure
Carbon deposits on spark
plug and/or improper gap
Dirty fuel filter
Dirt in nozzle
Water in fuel tank
Electronic ignitor not
grounded (earthed)
Bad electronic ignitor
See Pump Pressure
Adjustment, page 14.
See Spark Plug, pages 12
and 13.
See Fuel Filter, pages 10
and 11.
See Nozzle, pages 15 thru
17.
Drain and flush fuel tank
with clean kerosene. See
Storage, page 8.
Make sure electronic
ignitor mounting is tight.
Replace electronic
ignitor.
Motor does not start
when heater is
plugged in, fan
rotates slowly or
does not turn.
Flame-out control not reset
(EDI models only)
Binding pump rotor
Reset flame-out control
button, see Figures 6 thru
8, pages 7 and 8.
If fan is hard to turn, see
Pump Rotor, page 18.
WARNING
Never service heater while it is plugged in, operating, or hot.
Severe burns and electrical shock can occur.
WARNING: High voltage!

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099605
Fan
Guard
Figure 12 - Fuel Filter Removal, 30/70,000 BTU/Hr Models
Figure 11 - Upper Shell Removal, 150,000 BTU/Hr Model
Figure 9 - Upper Shell Removal,
30/70,000 BTU/Hr Models Figure 10 - Upper Shell Removal,
90,000 BTU/Hr Model
Fuel Filter
Side Cover
Fuel Line
Fuel Filter
(30/70,000 BTU/Hr Models)
1. Remove side cover screws
using 5/16" nut-driver.
2. Remove side cover.
3. Pull rubber fuel line off
fuel filter neck.
4. Carefully pry bushing and
fuel filter out of fuel tank.
5. Wash fuel filter with clean
fuel and replace in tank.
6. Attach rubber fuel line to
fuel filter neck.
7. Replace side cover.
Fan Guard
Upper
Shell
SERVICE
PROCEDURES
Upper Shell Removal
1. Remove screws along each
side of heater using 5/16"
nut-driver. These screws
attach upper and lower
shells together.
2. Lift upper shell off.
3. Remove fan guard.
WARNING
Never service heater while it is plugged in, operating, or
hot. Severe burns and electrical shock can occur.
Upper
Shell
Fan
Guard
Upper
Shell