Toyostove Laser 73 User manual

LASER CLEAN VENTED
MODEL Laser 73 / Laser 73AT
CONTENTS
IMPORTANT
READ AND UNDERSTAND INSTRUCTIONS BEFORE INSTALLING OR USING HEATER.
RETAIN INSTRUCTIONS FOR FUTURE REFERENCE. CHECK LOCAL CODES FOR PERMITTED USE.
LASER CLEAN HEATING SYSTEM/VENTED HEATER
INSTALLATION AND OPERATION INSTRUCTIONS
SECTION A:
Specifications
Safety Features
SECTION B:
Safety Tips for Operation
SECTION C:
Fuel Guide
SECTION D:
Operating Controls and Part Names
SECTION E:
Operation
Before Ignition
Operation
Turning Heater Off
SECTION F:
Routine Maintenance
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SECTION G:
Troubleshooting
SECTION H:
Long Term Storage
SECTION I:
Installation
Tools Needed for Installation
Standard Installation Parts
Accessary Parts
Safety Tips for Installation
Installation of Heater and Flue Pipe
Permanent Wiring Installation
SECTION J:
Fueling
(Type M)
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 1

SECTION A:
SPECIFICATIONS
Model:
Heater Efficiency:
Heat Rating:
Fuel Consumption:
Fuel System:
Fuel Type:
Dimensions (W ´ H ´ D):
(Includes drip tray)
Weight:
Vent Pipe Hole:
Maximum Length of Vent Pipe System:
Electrical Rating:
Typical Room Size (3):
Laser 73
92% (1)
High - 40,000 BTU/h (11,733 Watts)
Med - 27,000 BTU/h (7,920 Watts)
Low - 15,000 BTU/h (4,400 Watts)
High - 0.301 gal/h (1.139 L/h)
Med - 0.203 gal/h (0.768 L/h)
Low - 0.113 gal/h (0.428 L/h)
External tank (2)
ASTM D3699 1-K Kerosene or ASTM D396 No.1 S500
Low Sulfur No.1 Fuel Oil
30“ ´ 27-1/2“ ´ 16-3/4“
(76.2 ´ 68.8 ´ 42.5 cm)
88 lbs. (40 kg) Empty
2-3/4“ ~ 3“ diameter
(7.0 - 7.5 cm)
10 ft. (3 m), 3 bends or less
120 Volts AC, 60 Hz
Preheat
- 280W
Burning
- 76W
1670 square feet (0˚F)
2000 square feet (20˚F)
(1)
(2)
(3)
Heat and vaporized water are produced by the combustion process of this kerosene heater. This rating
does not take into account heat loss due to condensation of water vapor.
External tank to be purchased from local suppliers.
0˚ F Heat Load =24 BTU/ft2/hr
20˚ F Heat Load = 20 BTU/ft2/hr
Room size for which this heater is suitable will vary depending on outside temperature, house
insulation, window size, and other factors.
2
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 2

SAFETY FEATURES
Your Laser 73 is equipped with the following safety features. Please familiarize yourself with these features.
When your heater is extinguished due to a safety mechanism, be sure to identify and correct the problem.
Flame Sensor
Heater will automatically stop all operations if ignition fails or if flame fails during combustion, in order
to prevent fuel overflow. Error code will be displayed on the digital indicator.
Fuel Strainer
Special strainer catches any dirt or impurities present in the fuel before it is sent to the burner.
Overheat Protector
Automatically stops all operations if heater cabinet reaches abnormally high temperature due to motor
malfunction or abnormal combustion, in order to prevent fire.
Power Failure Recovery System
If power fails during heater operation, heater will turn off. When power resumes, heater will
automatically reignite to maintain the selected room temperature.
Fully Vented System
Flue pipe system provides outside air for combustion and vents all combustion products to the
outdoors.
Fusible Link Valve
If a household fire should occur, bringing the fuel line or heater to extremely high temperatures, the
fusible link valve will stop the fuel supply to the burner. This will prevent the fuel supply from the
external tank continuing to flow into the house.
1.
2.
3.
4.
5.
6.
3
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 3

CAUTION:
0204060
-20 A
B
Room Temperature (˚F)
Outside Temperature (˚F)
-25
-30
-35
-40
-45
SECTION B:
SAFETY TIPS FOR OPERATION
If outside temperature -20°F
than room temperature has to be 0°F or above
If outside temperature -45°F
than room temperature has to be 60°F or above
Point A:
Point B:
Heater and vent pipe system must be properly installed before operation.
Please follow instructions under “Installation”, Section I.
Never use any fuel other than clear or red colored kerosene (ASTM D3699
1-K Kerosene or ASTM D396 No.1 S500 Low Sulfur No.1 Fuel Oil). NEVER
USE GASOLINE. Use of gasoline can lead to uncontrollable flames,
resulting in destructive fire.
1.
Due to high surface temperatures, keep heater away from children, furniture
and clothing while in operation (See Page 24).
2.
To prevent abnormal operation and prolong heater life, be sure to perform
routine maintenance (See Pages 12
- 13).
3.
Never store or transport kerosene in other than a metal or plastic container
that is (1) acceptable for kerosene, (2) non-red in color, and (3) clearly
marked, “KEROSENE” or “No.1 FUEL OIL”. Never store kerosene in the
living space.
4.
Operating Temperature Range
Use heater within the range of temperatures
indicated in the right figure.
5.
Operating Range
RIGHT
KEROSENEKEROSENE
WRONG
GAS
Kero-
sene
Danger
4
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 4

SECTION C:
FUEL GUIDE
Clean and high-quality ASTM D3699 1-K Kerosene or ASTM
D396 No.1 S500 Low Sulfur No.1 Fuel Oil.
Kerosene free of contaminants, water or cloudiness.
Gasoline, alcohol, white gas, camp stove fuel or additives.
Yellow or sour-smelling fuel.
Store in a clean container, non-red in color, clearly marked
KEROSENE or No.1 FUEL OIL.
Store away from direct sunlight, heat sources or extreme tem-
perature changes.
In a glass container, or one that has been used for other fuels.
For longer than six months. Begin each heating season with
fresh kerosene; discard at the end of season.
In the living space.
¡Excess tar deposits on burner and flue pipe
¡Incomplete combustion
¡Reduced heater life
What to Buy . . .
ALWAYS :
ALWAYS :
NEVER :
NEVER :
How to Store It . . .
ALWAYS :
ALWAYS :
NEVER :
NEVER :
NEVER :
Why It is Important . . .
Pure, clean kerosene is essential for safe and efficient heater operation. Poor
quality or contaminated kerosene can cause:
Use of a highly volatile flammable fuel such as gasoline can produce
uncontrollable flames, creating a severe fire hazard.
GAS
The Toyostove Laser 73 is designed for use with ASTM D3699 1-K kerosene or ASTM D396 No.1 S500 Low
Sulfur No.1 Fuel Oil. Use of low-quality kerosene will cause burner performance to drop, leading to abnormal
combustion and reduced heater life.
Purchase only ASTM D3699 1-K kerosene or ASTM D396 No.1 S500 Low Sulfur No.1 Fuel Oil in non-red cans
reserved exclusively for kerosene and marked accordingly with the word “KEROSENE” or “No.1 FUEL OIL”.
Always store your kerosene in a separate area from where you store gasoline for your power equipment to
avoid accidental use of gasoline in your heater.
5
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 5

Before using heater, familiarize yourself with the following operating controls and part names.
SECTION D:
OPERATING CONTROLS AND PART NAMES
BURNER
LOW
MED
HIGH
BURNINGMODE
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
START SET-BACK
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
SET
TEMP
AM
PM
ROOM
Programmable Set Back
END SET-BACK
CLOCK SET
CLOCK/TEMP
(NORMAL POSITION)
8. ON/OFF lamp
6. Digital Indicator
7. Burning mode lamp
9. Auto lamp
2. Auto switch
3. Temperature selector
1. ON/OFF switch
10. Normal temperature lamp
11. Set-back temperature lamp
4. Timer & clock set
5. Timer selector
Make a note of your heater’s serial number,
located on the outside cabinet surface.
Your heater’s serial number:
SERIAL NO.
6
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 6

Main switch which turns heater on and off. When switched on,
heater begins operation and combustion starts after preheat period.
The switch turns automatic operation modes on and off which
have been programmed into timer.
“NORMAL” and “SET-BACK” temperature selectors allow user to
select desired temperature during manual or automatic operation.
Timer and clock set modes can be set by pressing hour or minute
buttons.
Clock, clock set, “SET-BACK” mode, start time set and end time
set can be selected by this switch.
Displays clock, set temperature, room temperature and error code.
Indicates whether heater is operating at high, medium or low
combustion.
Lights when heater is in operation and flashes when heater is in
prepurge or postpurge.
Lights when automatic operation is in use.
Lights when heater runs with manual or “NORMAL” mode of
automatic operation.
Lights when heater runs with “SET-BACK” mode of automatic
operation.
Three-speed motor supplies high-capacity warm air flow during
high combustion for heating room up quickly, and low or medi-
umcapacity warm air flow during low or medium combustion for
maintaining comfortable room temperature.
Constantly senses room temperature and supplies information to
heater so that desired room temperature can be maintained.
For use in 120V, AC electrical outlets only.
Allows user to check if heater is positioned evenly.
1. ON/OFF switch:
2. Auto switch:
3. Temperature selectors:
4. Timer & clock set:
5. Timer selector:
6. Digital indicator:
7. Burning mode lamp:
8. ON/OFF lamp:
9. Auto lamp:
10. Normal temperature lamp:
11. Set-back temperature lamp:
12. Circulating fan:
13. Room temperature sensor:
14. Power supply cord:
15. Plumb bob:
INDICATOR LAMPS
ON/OFF lamp
AUTO lamp
LOW lamp
MED lamp
HIGH lamp
NORMAL lamp
SET-BACK lamp
Flashing - Pre-heating, pre-purging and post-purging mode
Lit - Heater in operation
Flashing - Power loss of more than 10 seconds
Lit - Heater in operation at auto mode
Lit - Heater in operation at low combustion
Flashing - Pre-purging mode (without flame)
Lit - Heater in operation at medium combustion
Lit - Heater in operation at high combustion
Lit - Heater in operation at normal mode
Lit - Heater in operation at set-back mode
7
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 7

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20478446
20479146
20475804
20479104
20450007
20474970
20478129
20479129
20478160
20479160
20478463
20479163
20478164
20479164
20475172
20478644
20475808
20478642
20478643
20478026
20478383
20475518
17185580
20474921
20474920
20478411
20475194
20475850
20475831
20475881
20474992
20475893
20478437
20478847
20478871
20475883
20475875
20475878
20475877
20478534
20478419
20478641
20478550
20475551
20475552
20478512
20478378
20478379
20478306
20478376
20478301
20478317
20477414
20478314
10005597
20475852
20478669
20478373
20479891
20474925
20475535
20478188
20474059
20478156
20479156
20474050
20474039
20474057
20475553
20474055
20450120
20478090
20475874
20474272
20475171
20474983
20478613
20478366
20478683
20479293
20479297
20479196
Front panel assembly
Front panel assembly (L-73AT)
Carrying handle
Carrying handle (L-73AT)
Plumb bob
Adjustable leg
Drip tray
Drip tray (L-73AT)
Top plate
Top plate (L-73AT)
Right side panel
Right side panel (L-73AT)
Left side panel
Left side panel (L-73AT)
Fan cover
Heat exchanger
Heat chamber assembly
Burner assembly
Burner ring
Fuel nozzle
Fuel nozzle gasket
Igniter
Igniter gasket
Igniter guide gasket
Igniter cover
Primary flame rod
Burner gasket
Burner insulating pad
Mica window
Peep window gasket
Joint packing
Heat chamber gasket
Blower motor assembly
Blower motor assembly with case
Blower motor exhaust fan
Blower motor intake fan
Blower motor case gasket
Rubber mat
O-ring (ø75)
Fuel sump
Fuel pump
Fuel pipe assembly
Inlet strainer
Drain screw with O-ring
Strainer gasket
Main circuit board
Fuse A
Fuse B
High limit switch
Indicator lamp circuit
Knob for temp selector
Transformer
PCB support
PCB support (S)
Fusible link valve
Leveler fuel pipe
Circulation fan motor
Thermistor
Flue pipe
Oil catch
Power supply cord
Screw 1X
Holder A
Screw 1S
Screw 1Y (L-73AT)
Screw C
Insulator A
Flange nut
Screw 1P
Screw O
Screw for igniter unit
Screw 1T
Washer for blower motor
Screw M
Circulation fan
Outlet adapter
Burner mat
Air damper (ø25)
Draft tube
Instruction manual
Carton
Carton (L-73AT)
REF # PART # PART NAME
REF # PART # PART NAME REF # PART # PART NAME
3,4
13,14
66
66
9,10
a
64,65
58
67
15
66
66
75
66
66 70
57
b
61
64,65
3,4
11,12
5
60
55
56
66
66
a
74
59
7,8
64,65
63
1,2
B
A
49 71
66
66
66
66
66
DETAIL A
66
52
53
54
46
48
47
DETAIL B
66
66
50
51
DETAIL C
69
45
44
43
70
41
40
70
42
C
56 55
66
66
36
34
73
35
68
37
66
76
66
19
16
39
72
32
62
66
31
17
29
30
66
66
66
38
33
18
68
28
27
77
79
26
24
23
66
6
78
22
25
66
66
21
20
66
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 8

BEFORE IGNITION
4.
OPERATION
SECTION E:
OPERATION
MANUAL OPERATION
Open the Valve(s)
Open the valve(s) of the external fuel tank.
Start the Fuel flow
If using heater for the first time, or after heater has been out of fuel, press
the red reset button once for a period of one second in order to send fuel
to the fuel sump.
Plug in the Heater
Plug heater into a 120V AC electrical outlet.
Note: Do not connect to an outlet shared with other appliances.
C. Position timer selector to “CLOCK/TEMP (NORMAL POSITION)” after clock setting is completed.
Current time will be shown on digital indicator.
In the event of a power failure over ten (10) seconds, all clock and timer settings are cancelled.
Digital indicator will flash “PM 12:00” when heater is off, or “AUTO” lamp will flash when
heater is on and in automatic operation, after is power is restored. However, no indications
when heater is in manual operation. At this point, you need to reset all time and set-back
functions.
Note:
“MANUAL” operation means that the set-back will not be in use but in ”NORMAL” mode.
Operation of the heater is under the direct control of the user (“AUTO” switch is off). Heat output will,
however, be automatically adjusted in accordance with the room temperature registered by the
temperature sensor.
Operation of Laser Heater can be controlled manually by the user - “MANUAL” operation (NORMAL mode
only) or run automatically by the programming - ”AUTOMATIC” operation (NORMAL mode and SET-BACK
mode).
3.
Set Clock
Important: Clock on the heater always
must be set to current time.
A.
Position timer selector to “CLOCK SET”.
B. Press “HOUR” and “MINUTE” button
of TIMER/CLOCK SET to correct time.
Important: Check for the AM or PM
indicators, to insure the
correct time.
4.
Note: Make sure there is no fuel leakage from the fuel line or joints.
Also make sure fuel tank is not too high. See installation instructions.
1.
2.
“HOUR” or “MINUTE” button will
change the time every one (1)
unit. Holding the button
continuously will cause the time
to change rapidly.
Note:
BURNER
LOW
MED
HIGH
BURNINGMODE
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
START SET-BACK
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
SET
TEMP
AM
PM
ROOM
Programmable Set Back
END SET-BACK
CLOCK SET
CLOCK/TEMP
(NORMAL POSITION)
8. ON/OFF lamp
6. Digital Indicator
7. Burning mode lamp
9. Auto lamp
2. Auto switch
3. Temperature selector
1. ON/OFF switch
10. Normal temperature lamp
11. Set-back temperature lamp
4. Timer & clock set
5. Timer selector
Reset Button
9
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 9

1. Select Manual Operation
Press the “AUTO” switch to “OFF” position.
2. Turn Heater ON
A. Push in ON/OFF switch to “ON” position. The current room temperature
and the set temperature will be shown on the digital indicator. ON/OFF
lamp will start to flash and then blower motor and ignition will start.
Note: Heater will not start when room temperature is higher than the
desired temperature setting.
B. Burning mode lamp “MED” will start to flash after approx. 3 - 9 minutes
and ignition will take place. (*) After ignition, burning mode lamp “MED”
will change from flashing to continuous. And, after 10 seconds, burning
mode lamp will turn to “LOW” and heater will start “LOW” burning mode.
Circulation fan will turn on after approx. 3 minutes.
Note: (*) Pre -heating depends on the room temperature.
Room temperature: below 34°F - 9 minutes
34°F - 61°F - 6 minutes
over 61°F - 3 minutes
C. Heater will operate at “LOW” or “MED” burning mode for approx. 6 min-
utes after ignition, regardless of temperature control setting. Heater will
not go into “HIGH” burning mode while the prepurging is in effect. After
this period, output can be adjusted as desired by using the ”NORMAL”
temperature selector as directed in following instructions.
3. Adjusting Room Temperature
A. Slide “NORMAL” temperature selector to set the room temperature
desired. The temperature control should be set at the position you find
most comfortable.
Note: Desired temperature setting will be displayed on the digital
indicator when you set the room temperature.
Note: The scale on temperature selector is just for your reference. The
figures on the digital indicator and on the scale may not match
exactly; This is normal.
B. Burning mode will be regulated automatically in accordance with the room temperature registered by
the room temperature sensor. Heater will be operated at “HIGH” burning mode until room tempera-
ture reaches the selected temperature level.
C. When room temperature reaches the selected setting, heater will automatically shift to “MED” or
“LOW” burning mode to maintain the desired temperature.
When room temperature exceeds the selected setting by approx. 4°F, the heater will automatically
shut off. As room temperature drops, the heater will automatically re-start to maintain the desired
temperature.
BURNER
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
START SET-BACK
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
END SET-BACK
CLOCK SET
CLOCK/TEMP
(NORMAL POSITION)
BURNER
LOW
MED
HIGH
BURNINGMODE
SELECT
OFF ON
AUTO
OFF ON
50°F
°C
70 90
SET
TEMP
AM
PM
ROOM
Programmable Set Back
BURNER
LOW
MED
HIGH
BURNINGMODE
SELECT
OFF ON
AUTO
OFF ON
50°F
°C
70 90
SET
TEMP
AM
PM
ROOM
Programmable Set Back
LOW
MED
HIGH
BURNINGMODE
BURNER
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
START SET-BACK
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
END SET-BACK
CLOCK SET
CLOCK/TEMP
(NORMAL POSITION)
BURNER
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
10
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 10

Ex.
“AUTOMATIC” operation is established by programming the time/temperature settings for specific
time, “SET-BACK” mode operation will be programmed in a 24-hour period. It is designed for energy
efficiency by using a lower temperature setting, generally at night.
1. Set Start Time of “SET-BACK” Mode.
A. Slide the timer selector to “START SET-BACK”.
B. Press “HOUR“ and “MINUTE” button of TIMER/CLOCK SET to set desired start time.
Note: When setting “SET-BACK” time, the “MINUTE” button will advance time by ten (10) units.
(Ex. 10:00, 10:10, 10:20, etc.)
C. Start time of “SET-BACK” mode will be shown on digital indicator. (Ex. PM 10:00)
2. Set End Time of “SET-BACK” Mode.
With the timer selector slide switch in the “END SET-BACK” position, program the end time as
described above. (Ex. AM 6:00)
Important: Always return timer selector to “CLOCK/TEMP (NORMAL POSITION)” after settings.
3. Set Room Temperature.
Slide “NORMAL” temperature selector and “SET-BACK” temperature selector at the position you
desire. (Ex. “NORMAL”
- 75˚F, “SET-BACK” - 60˚F)
Note: The temperature setting currently being used is displayed on the digital indicator. To view and
set the Set-Back temperature setting, press the “MINUTE” button for more than three (3) sec-
onds. The display will go back to the Normal temperature setting after ten (10) seconds.
4. Push in AUTO switch to “ON” position.
5. Turn Power ON.
Press ON/OFF switch to “ON” position. ON/OFF lamp will start to flash and AUTO switch lamp will light.
And then blower motor and ignition will start.
Note: SET-BACK OPERATION IRREGULAITIES: If a heater is switched “OFF”; if the “AUTOMATIC”
operation is switched off; or there is a power interruption while the unit is operating in the
“SET-BACK” mode, the “SET-BACK” mode may be temporarily disabled until the next Start
Set-Back time.
Ex.
Approx. +4˚F
Approx. +1˚F
SET
TEMP.
High Medium Low Off Re-lgnition
“NORMAL”
mode
Start Set-Back
“NORMAL”
mode
75˚F
60˚F 60˚F
“SET-BACK”
mode
PM10:00 AM6:00 PM10:00 AM6:00
End Set-Back
AUTOMATIC OPERATION
11
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 11

LOW
MED
HIGH
BURNINGMODE
BURNER
TEMP SELECT
TIME/CLOCK SET
OFF
NORMAL
SET·BACK
ON
AUTO
OFF ON
HOUR MINUTE
50°F
10°C
70
21
90
32
50°F
10°C
70
21
90
32
FOR OPTIMUM HEATER PERFORMANCE, THE PARTS SHOWN BELOW SHOULD BE CLEANED REGULARLY:
CAUTION:Be sure to unplug heater before performing any checks or cleaning.
CAUTION:Allow heater to cool completely before cleaning or maintenance.
TURNING HEATER OFF
MANUAL COMBUSTION
Press ON/OFF switch to “OFF” position. (AUTO lamp and temperature lamp will
go out. Burning mode lamp will flash until flame disappears.) Circulation fan and
blower motors continue to run for approx. three (3) minutes to cool down the
heater. Make sure ON/OFF lamp goes out when the fan stops.
Note: If ON/OFF switch is pressed to “ON” position during the cool down peri-
od, the heater will automatically re-start at the end of cool down period.
Note: Disconnect the heater plug from the electrical outlet after the power lamp
has turned off if the heater will go unused for a prolonged period. The
plug should also be disconnected during electrical storms.
Note: Heater may also be shut down by lowering the setting on the temp. selec-
tor thermostat(s) because heater goes into “OFF” cycle.
SECTION F:
ROUTINE MAINTENANCE
Important: This feature is for testing purpose only!
This heater also can be kept burning at desired combustion mode (High, Medium or Low) manually, regardless of room
temperature.
1. Press the “HOUR“ button and “MINUTE“ button at the same time for more than three (3) seconds when
ON/OFF switch is “ON“.
2. P1, P2 or P3 will be displayed on the Digital Indicator;
P1 = Low mode
P2 = Medium mode
P3 = High mode
Then select desired combustion mode by pressing “MINUTE“ or “HOUR“ button. “MINUTE“ button changes com-
bustion mode to higher, “HOUR“ button changes combustion mode to lower.
3. To clear, press the “HOUR“ button and “MINUTE“ button at the same time for more than three (3) seconds until
normal temperature display returns.
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 12

1. Clean Louvers (ONCE A WEEK)
Dust and stains should be wiped off louvers with a damp cloth.
2. Clean Circulation Fan Cover (ONCE A WEEK)
Remove only dust or pet hair from the cover on the back of the heater.
3. Check for Kerosene Leaks (REGULARLY)
Make it a habit to check for any sign of kerosene leakage along the fuel line
and at all joints. Kerosene leaks may lead to risk of fire.
4. Check Flue Pipe Area (ONCE A WEEK)
Check the flue pipe joint to make sure connection is firm. Use a vacuum
cleaner to remove any dust or pet hair.
5. Clean Fuel Strainer (ONCE A MONTH)
The strainer of the fuel sump should be cleaned once a month and before
storing heater at the end of each season.
(a) Close the valve(s) of the separate fuel tank.
(b) To catch the fuel which will drain out, set the oil catch below the strainer
cover, with a small container under it.
(c) Loosen the two screws from the strainer cover and remove.
(d) Remove the strainer and wash with kerosene.
(e) Return the strainer to its original position. Replace strainer cover and
screw to secure.
(f) Wipe away any spilled kerosene.
(g) Open the valve(s) of separate fuel tank. Check for kerosene leakage.
Note: At the end of each season unscrew the drain screw to remove all the
remaining kerosene from the fuel sump.
Be sure to follow the A and B procedure listed above.
Check
Drain
Screw
Oil catch
Fuel
Strainer
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 13

The following symptoms are normal during operation of the heater.
White smoke or smell at initial use after
purchase.
Flames flashing for a few minutes after
ignition.
Occasionally makes “cracking” noise when
heater is ignited or extinguished.
Part of the heat chamber or the heat
exchanger is heated to a cherry red color.
Warm air will not blow as soon as ignited.
Audible chugging sound from fuel pump
when started first time or after running out
of fuel.
“Ticking” noise.
Machine oil or dust burns of the surfaces of
the burner or heat exchanger.
The burner is cold and igniter is kept running
for a while after ignition.
Expansion and shrinkage of metal parts when
they are heated or cooled.
To prevent uncomfortable cool air from
coming out at the beginning, circulation fan
start up is delayed.
Air is in the pump. However, noise should
stop within 1 minute.*
Noise of fuel pump in operation.
Normal.
Normal.
Occasional yellow flickering in blue flame. Normal.
When heater is started
or extinguished.
When heater is
in operation.
CONDITION REASON
SECTION G:
TROUBLESHOOTING
NOTE BEFORE REQUESTING FOR REPAIR AND SERVICES
AUTOMATIC CLEANING SYSTEM
Heater will automatically clean igniter for ten (10) minutes every day at 2:00 a.m. and display “CL:10” on
Digital Indicator if heater is running at that time.
MANUAL CLEANING SYSTEM
Heater will clean igniter for ten (10) minutes manually.
1. Press the “HOUR” button and “MINUTE” button at the same time for more than three (3) seconds when
ON/OFF switch is “OFF”.
2. Display will appear “CL:10” on Digital Indicator. Cleaning will begin and end without any additional
input.
Note: Cleaning igniter is important to prolong igniter life. It is recommended that the igniter be cleaned
once a week.
*If sound from fuel pump does not decrease and heater shuts off, check:
1. Push red reset button on fuel sump. DO NOT hold down.
2. Insure that all valves are open and filter is clear.
3. Insure external fuel tank has fuel and filters are clean.
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 14

PROBLEM DISPLAY/LAMP CAUSE SOLUTION
POWER LAMP
FAILS TO TURN ON
Disconnected power plug
Circuit board malfunction
Plug into 120V AC outlet.
Consult your dealer.
EE2
EE2
EE2
EE2
EE2
EE2
EE8
NO IGNITION* Out of fuel
Fuel tank valve closed
Air pocket in fuel line
Clogged flue pipe
Clogged fuel strainer
Igniter, circuit board, flame
sensor or fuel pump malfunction
Blower motor malfunction
Check fuel gauge on fuel tank; refuel.
Open valve by turning counterclockwise.
Push reset button on the fuel sump,
located right inside, once.
Clean flue pipe.
Clean fuel strainer (See page 13).
Consult your dealer.
Consult your dealer.
EE6
EE6
EE6
EE6
EE6
EE6
EE6
EE8
EXTINGUISHED
AFTER IGNITION
Air pocket in fuel line
Out of fuel
High limit switch activated
Fuel flow obstruction
Tank too high
Fuel sump valve malfunction
Flame sensor malfunction
Blower motor malfunction
Push reset button on the fuel sump,
located right inside, once.
Check fuel gauge on fuel tank; refuel.
Clean circulation fan cover, remove any
obstructions.
Consult your dealer.
Re-locate fuel tank.
Consult your dealer.
Consult your dealer
Consult your dealer.
POOR COMBUSTION/
NOISY COMBUSTION
Soot buildup in flue pipe
Burner ring not properly seated
Altitude too high (See page 23.)
Clean out any soot.
Consult your dealer.
Consult your dealer.
EE10
DOES NOT
EXTINGUISH
Possibly excess fuel in burner
Flame sensor malfunction
Consult your dealer.
Consult your dealer.
ODOR Leaking flue pipe
Kerosene leakage
Faulty packing or gasket in
combustion area
Tighten all flue pipe connections.
Tighten all fuel line joints. Wipe away any
kerosene drippage.
Consult your dealer.
Hi
Room temp is over 95˚F.
Incorrect location of room temp
sensor
Correct the location of the room temp
sensor.
Lo
Room temp is lower than 14˚F.
Room temp sensor malfunction or
disconnected
Check room temp sensor.
Low/Med/
High lamps
flashing at
the same
time
DOES NOT
EXTINGUISH
Possibly excess fuel in the burner or
flame sensor
malfunction (miss detection)
Consult your dealer.
Should problems arise during operation or ignition, use this chart to determine the cause and the proper
steps to take. Be sure to unplug heater and allow to cool completely before taking corrective measures.
In the event that heater should extinguish itself, without any action or your part, you should look to the
digital indicator for any of the following error codes.
WARNING: Do not re-use the unit until the cause of the “EE10” code has been determined.
If the corrective measures outlined above do not solve the problem, please consult your TOYOSTOVE dealer.
*Note: If the unit fails 3 times after checking all causes listed, DO NOT CONTINUE turning the power switch
on and off. (Consult your dealer.)
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 15

At the close of each heating season, or when you do not plan to use your heater for an extended period, the
following procedures are recommended.
1. As the end of the season approaches, calculate your kerosene purchases so that you can use up all the
kerosene you have on hand. When kerosene is stored for over six months, its quality may deteriorate.
The use of such kerosene will have an unfavorable effect on heater operation.
2. If your heater needs any service or repair, now is the time to call your dealer and get it done before
storage. That way your heater will be ready for immediate use when the next heating season begins.
3. If you plan to store your heater in place,
(a) Disconnect power supply.
(b) Close the main tank valve.
(c) Remove all kerosene from the fuel sump and clean the fuel strainer.
(See page 13.)
(d) Wipe off any stains or dust on heater with a damp cloth, then wipe once
again using a dry cloth.
(e) Cover heater completely with a large plastic bag to protect from dust.
SECTION H:
LONG TERM STORAGE
Dealer
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 16

Pipe Holder (1) (PART #20474963)
Wall Brackets (2 sets) (PART #20474962)
Pipe Stopper (1) (PART #20474964)
Drip Tray (1) (PART #20478129 for Laser 73)
(PART #20479129 for Laser 73AT)
SECTION I:
INSTALLATION
TOOLS NEEDED FOR INSTALLATION
STANDARD INSTALLATION PARTS
The following standard installation parts are enclosed with heater. For alternate installation methods, you
may need to purchase additional accessories which are available from your TOYOSTOVE dealer. See
”Accessory Parts“, page 19.
Tool Use
Phillips Head Screwdriver Installation of flue pipe, etc.
Electric Drill Drilling hole in wall for flue pipe
Hole Saw, 2-3/4 to 3“ diameter Making hole in wall for flue pipe
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 17

Flue Pipe (1) (PART #20479891)
Exhaust Air Cap (1) (PART #20479845)
Intake Air Cap (1) (PART #20474949)
Oil Catch (1) (PART #20474925)
Inlet Hose (1) (PART #20474951)
Spacer (1) (PART #20478967)
Bent Joint (1) (PART #20474984) L-Shaped Hose (2) (PART #20474975)
Hose Band (2) (PART #20474977)
(3)
(3)
18
Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 18

Fuel Lifter Pump Model OPT-91UL
PART #20477500
PART #20479872
PART #20474951
PART #20474950
PART #20479861
PART #20474955
PART
#20474954
Exhaust Extension Pipe
PART #20479887
3/81-3/8
Intake Pipe
Joint
Insulating cloth cover
Pipe Support
Hardware
L-Shaped exhaust joint
Intake Pipe
FUEL
LIFTER PUMP
LOCATION
EXAMPLE
FUEL
TANK
FUEL
TANK
FUEL
LIFTER PUMP
LOCATION
EXAMPLE
PART #20479853
Adjustable Exhaust Pipe
Max. 39-3/8~ Min. 22-7/16
3/83/81-3/8
PART #20479887 Flue pipe ext. (for wall up to "9~13")
PART #20479873 Flue pipe ext. (for wall up to "13~16")
PART #20479874 Flue pipe ext. (for wall up to "16~20")
PART #20479875 Flue pipe ext. (for wall up to "20~24")
Flue pipe extension
External Fuel Supply
Installation Kit
PART# 10005098
40 inch
3-1/2
6-1/2 ft.
39-3/8
3-1/2
3-3/8
ACCESSORY PARTS
The following accessory parts are available for use in non-standard installation of the Laser 73. After giving
careful consideration to your desired heater and flue pipe locations and fueling system, consult your
TOYOSTOVE dealer to purchase the necessary accessory parts.
Important: Use only genuine TOYOSTOVE parts for your heater. Use of unauthorized generic or other
brand parts can severely reduce performance and safety, and will invalidate factory warranty.
Accessory
Extension pipe kit (L)*
Extension pipe kit (M)*
Extension pipe kit (S)*
L-Shaped exhaust joint*
Fuel lifter pump
Model OPT-91UL
External Fuel Supply
Installation Kit
Pressure reducing valve
Part No.
20479898
20479897
20479896
20479861
20477500
10005098
10005099
Application
Extends pipe system by 61-3/4 to 78-3/4”
Extends pipe system by 22-1/2 to 39-3/8”
Extends pipe system by 12-5/8 to 19-5/8”
For 90 degree bend in exhaust pipe
Used to lift fuel to heater when fuel tank is located underground
or outdoors in a position lower than the heater.
With automatic recovery.
For installation of external tank system
See Note on page 30.
*Total length of extension pipe between heater and flue pipe must be no greater than 10 ft. No more than
three bends may be used in extension pipe.
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 19

EXTENSION KIT
When using the “Extension pipe (L)” extension kit, the distance
between the heater exhaust pipe connection and the flue pipe
connection must be at least 63-5/8inch but no more than 80-1/2
inch. (See Figure 1 for reference.)
Extension Pipe Kit (L) PART #20479898
No. Name of Part Q’ty
1
2
3
4
5
6
7
Adjustable Exhaust Pipe
Max. 39-3/8~ 22-7/16
Exhaust Extension Pipe
(long, 39-3/8inch)
Intake Pipe (80 inch)
Insulating cloth cover
(40 inch)
Pipe Holder
Pipe Support Hardware
L-Shaped Exhaust Joint
1
1
1
2
2
3
sets
1
NOTE: Use “L”-shaped Exhaust Joint if necessary.
INSTALLATION WITH EXTENSION PIPE KIT (L)
Adjustable
Exhaust Pipe
Insulation
cloth cover
Exhaust Extension
Pipe (long)
Pipe
holder
Intake Hose
Pipe Support
Hardware
(# 20479861) (# 20474963)
(# 20474950)
(# 20479853)
(# 20479872)
(# 20474951)
(# 20474955)
Pipe Support Hardware
Pipe Holder (2 pcs.)
Pipe Holder Support (1 pc.)
Screw
(1 pc.)
Wood Screw
(2 pcs.)
Nut (1 pc.)
75
6
3-3/8
3-1/2
1
2
3
4
40 inch
80 inch
39-3/8inch
Max. 39-3/8~ Min. 22-7/16 inch
Flue pipe
connection
Intake
Hose
Heater
Exhaust
pipe
connection
Figure 1
63-5/8~ 80-1/2
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Laser 73 (Type M) (E) 08.1.17 11:15 AM Page 20