Master TENTEvent125 TB116A User manual

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.
GENERAL HAZARD WARNING:
Failure to comply with the precautions and instructions
provided with this heater, can result in death, serious
bodily injury and property loss or damage from hazards

poisoning and/or electrical shock.
Only persons who can understand and follow the instruc-
tions should use or service this heater.
If you need assistance or heater information such as an in-
structions manual, labels, etc. contact the manufacturer.
Save this manual for future reference.
PROPANE TENT EVENT
FORCED AIR HEATER
OWNER’S MANUAL
MODELS TB116A, TB117A AND TB118A
125,000 BTU/HR
125
TENT
Event
by

www.desatech.com 120942-01E2
WARNING: If the information in this manual is not

property damage, personal injury or loss of life.
 -
pors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
 
 
phone in your building.
 

 
department.
— Installation and service must be performed by a quali-

If you smell gas, turn off gas supply at tank.
-
gen) from the tent in which it is installed. Provisions for
adequate combustion and ventilation air must be pro-
vided. Provide at least 42 square inches of opening.
State of Massachusetts: The installation must be made

of Massachusetts.
TABLE OF CONTENTS
Safety .................................................................. 3
Ventilation............................................................ 5
Product Identication........................................... 6
Propane Supply................................................... 6
Electrical Supply.................................................. 7
Unpacking............................................................ 7
Theory of Operation............................................. 8
Assembly............................................................. 9
Installation ..........................................................11
Operation........................................................... 12
Storage.............................................................. 13
Maintenance...................................................... 13
Service............................................................... 13
Specications .................................................... 17
Troubleshooting................................................. 18
Technical Service............................................... 19
Wiring Diagram.................................................. 20
Parts .................................................................. 22
Replacement Parts............................................ 26
Accessory.......................................................... 26
Warranty ............................................................ 28

www.desatech.com
120942-01E 3
SAFETY
General
ANSI/NFPA 102
Standard for Grandstands, Folding and
telescopic Seating, Tents and Mem-
brane Structures
ANSI/NFPA 58
Standard for Storage and Handling of
Liquieed Petroleum Gas Latest Edition
ANSI Z223.1/NFPA 54
National Fuel Gas Code Latest Edition
ANSI/NFPA 70
National Electric Code Latest Edition
CSA C22.1 Canadian Electrical Code
Part 1
The primary purpose of construction heaters
is to provide temporary heating of buildings
under construction, alteration or repair.
Properly used, the heater provides safe eco-
nomical heating. Products of combustion are
vented into the area being heated.
We cannot foresee every use which may be
made of our heaters. 

about heater use.
Other standards govern the use of fuel gases
and heat producing products for specific
uses. Your local authorities can advise you
about these.
WARNING: When used with-
out adequate combustion and
ventilation air, heater may give

an odorless, poisonous gas.
Do not install heater until all necessary provi-
sions are made for combustion and ventilation
air. Consult the written instructions provided with
the heater for information concerning combus-
tion and ventilation air. In the absence of instruc-
tions, refer to the national fuel gas code, ANS
Z223.1, Section 5.3 or applicable local codes.
This heater is equipped with a an Oxygen
Depletion Sensing (ODS) safety shutoff
system designed to turn off the heater if not
enough fresh air is available.

depletion safety system!
If heater shuts off, do not relight until you
provide fresh air. If heater keeps shutting off,
have it serviced. Keep burner and control
compartment clean.
WARNING: This product
contains and/or generates
chemicals known to the State

birth defects or other reproduc-
tive harm.
WARNING: Fire, burn, inhala-

solid combustibles, such as
tables, chairs, building materi-
als, paper or cardboard, a safe
distance away from the heater
as recommended by the instruc-
tions. Never use the heater in
spaces which do or may contain
volatileorairbornecombustibles
or products such as gasoline,
solvents, paint thinner, dust par-
ticles or unknown chemicals.
WARNING: Not for home or
recreational vehicle use.
The heater is designed and approved for use
as a tent heater in accordance with these
instructions. CHECK WITH YOUR LOCAL
FIRE SAFETY AUTHORITY IF YOU HAVE
QUESTIONS ABOUT APPLICATIONS.
The heater is designed for use as a construc-
tion heater and as a vent-free tent heater. The
heater is designed for use in the space being
heated. The heater uses the air from within
the space being heated for combustion and
ventilation.
Applicable Standards:
For USA applications
ANSI Z83.7 - 2000
Gas Fired Construction Heaters
CGA 2.14 - 2000
Gas Fired Construction Heaters
CSA 3.06 - 2006
Portable Gas Fired Unvented Tent Heaters
For Canadian applications
ANSI Z83.7 - 2000
Gas Fired Construction Heaters
CGA 2.14 - 2000
Gas Fired Construction Heaters

www.desatech.com 120942-01E4
SAFETY
Continued
Note: Fan will continue running if fuel supply
is exhausted or thermal switch opens.

poisoning may lead to death!
   Early signs
of carbon monoxide poisoning resemble the
u, with headaches, dizziness, and/or nausea.
If you have these signs, the heater may not
be working properly. Get fresh air at once!
Check for proper ventilation and have heater
serviced. Some people are more affected by
carbon monoxide than others. These include
pregnant women, people with heart or lung
disease or anemia, those under the inuence
of alcohol, and those at high altitudes.
Propane/LP Gas: Propane/LPgas is odorless.
An odor-making agent is added to propane/LP
gas. The odor helps you detect a propane/LP
gas leak. However, the odor added to propane/
LP gas can fade. Propane gas may be present
even though no odor exists.
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.
WARNING: Do not place
-
terial on or near the appliance.
WARNING: Due to high tem-
peratures, the appliance should

from furniture.
WARNING: Young children
should be carefully supervised
when they are in the same room
with the appliance.
   
adults should be alerted to the
hazard of high surface tempera-
tureandshouldstayawaytoavoid
burns or clothing ignition.

or guard removed for servicing
an appliance must be replaced
prior to operating the heater.
1. Install and use heater with care. Follow all
local ordinances and codes. In the absence
of local ordinances and codes, refer to
the Standard for Storage and Handling of
Liqueed Petroleum Gas, ANSI/NFPA 58,
the Natural Gas and Propane Installation
Code, CSA B149.1, and ANSI/NFPA 102
Standard for Grandstands, Folding and
telescopic Seating, Tents and Membrane
Structures. This instructs on the safe stor-
age and handling of propane/LP gases.
2. Use only the electrical voltage and fre-
quency specied on model plate. The
electrical connections and grounding of
the heater shall follow the National Electric
Code, ANSI/NFPA 70 or the Canadian
Electrical Code, Part 1, CSA C22.1.
3. Electrical Grounding Instructions - This
appliance is equipped with a three-prong
(grounding) plug for your protection against
shock hazard and should be plugged di-
rectly into a properly grounded three-prong
GFI receptacle or extension cord.
4. Use only the hose and factory preset
regulator provided with the heater.
5. Use only propane/LP gas set up for vapor
withdrawal.
6. This is an unvented gas-red tent heater.
It uses air (oxygen) from the tent in which
it is installed. Provide adequate ventilation.
Before using heater, provide at least a 42 in
2
(271 cm
2
) opening of fresh, outside air.
7. For indoor and outdoor use.
8. Do not use heater in occupied dwellings
or in living or sleeping quarters.
9. Do not use heater in basement or below
ground level. Propane/LP gas is heavier
than air. If a leak occurs, propane/LP gas
will sink to the lowest poss ble level.
10. Keep appliance area clear and free from
combustible materials, gasoline, paint
thinner, and other ammable vapors and
liquids. Dust is combust ble. Do not use
heater in areas with high dust content.

www.desatech.com
120942-01E 5
29. The heater must be installed so that the
location of the heater does not obstruct or
interfere with normal or emergency exits
and doors or walkways in the structure.
30. Only use lifting handles to pick up appli-
ance (see Figure 1, page 6). Do not use
plastic top hand holds for lifting.
VENTILATION
WARNING: Follow the mini-
mum fresh, outside air ventila-
tion requirements. If proper
fresh, outside air ventilation is

poisoning can occur. Provide
proper fresh, outside air ventila-
tion before running heater.
Provide a fresh air opening of at least 42 in2
(271 cm2) opening of fresh, outside air.
Example: 3" high x 14" long = 42 in2. Provide
extra fresh air if more heaters are being used.

1. Determine volume of space to heat:
Length x Width x Height
50 feet x 30 feet x 15 feet = 22,500 ft3
2. Determine desired temperature rise:
Desired temperature 65° - 25° outside
temperature = 40° rise
3. Multiply volume x rise: 22,500 x 40 = 900,000
4. To determine how many BTU’s are needed
multiply by 0.133
900,000 x 0.133 = 119,000 Btu
The heater thermostat will cycle on and off to
maintain the desired room temperature more
often if the BTU/hr is oversized for the space
being heated. The air inltration and leakage
of heated air through cracks, passageway
openings, etc., will adjust the required BTU’s
needed for the desired temperature.
Ventilation Air Requirements - National

1 inch2of opening per 3,000 BTU with
outside air
1 inch2of opening per 1,000 BTU with non-
outside air
Determine fresh air needed
Input Max. divided by 3,000
125,000 BTU/hr ÷ 3,000 = 41.66
Provide 42 inch
2
of opening to fresh, outside air
3" high x 14" long - 42 inches2
11. Minimum heater clearances from com-
bust ble materials: Outlet: 8 ft. (2.40 m),
Sides: 1 ft. (30 cm), Top: 3 ft. (0.91 m),
Rear: 1 ft. (30 cm)
12. Keep heater at least 6 ft. (1.83 m) from
propane/LP tank(s). Do not point heater
at propane/LP tank(s) within 20 ft. (6 m).
In Canada keep heater at least 10 ft. (3 m)
from propane/LP tank(s).
13. Keep propane/LP tank(s) below 100° F
(38˚ C).
14. The minimum surrounding air temperature
rating for this heater is -20º F (-29º C).
15. Check heater for damage before each
use. Do not use a damaged heater.
16. Check hose before each use of heater.
If highly worn or cut, replace with hose
specied by manufacturer before using
heater.
17. Locate heater on stable and level surface
if heater is hot or operating.
18. Never block air inlet (rear) or air outlet
(front) of heater.
19. Keep heater away from strong drafts, wind,
water spray, rain, or dripping water.
20. Keep children and animals away from
heater.
21. Never move, handle, or service a hot
or operating heater. Severe burns may
result. You must wait 15 minutes after
turning heater off.
22. To prevent injury, wear gloves when han-
dling heater.
23. Never attach duct work to heater.
24. Space heaters used in the vicinity of tarpau-
lins, canvas or similar enclosure materials
shall be located a safe distance from such
materials. These enclosure materials shall
be of a re retardant nature. These enclo-
sure materials shall be securely fastened to
prevent them from igniting or from upsetting
the space heater due to wind action.
25. Do not alter heater. Keep heater in its
original state.
26. Do not use heater if altered.
27. Turn off propane/LP supply to heater and
unplug when not in use.
28. Use only original replacement parts. This
heater must use design-specic parts.
Do not substitute or use generic parts.
Improper replacement parts could cause
serious or fatal injuries.
SAFETY
Continued

www.desatech.com 120942-01E6
Figure 1 - Tent Heater
Top
Power Cord
Hose and
Regulator
Assembly
Gas Inlet
Lifting
Handle
Thermostat
Knob
ON/OFF
Switches
Receptacle
PROPANE SUPPLY
PRODUCT IDENTIFICATION
1. The amount of propane gas in tank(s)
2. The temperature of tank(s)
The following chart shows the number of
100 lb. (45 kg) tanks needed to run this
heater.
Smaller tanks can be used for limited run
times but it is recommended to use larger
tanks for optimum performance.
Average Temperature Number Of Tanks
  
Above 20° F (-6.7° C) 2
20° F (-6.7° C) to 0° F (-18° C) 3
Below 0° F (-18° C) Use larger tank
Less gas is vaporized at lower temperatures.
You may need two or more 100 b. (45 kg)
tanks or one larger tank in colder weather.
Your local propane gas dealer will help you
select the proper supply system. The mini-
mum surrounding air temperature rating for
each heater is -20° F (-29° C).
Propane/LP gas and propane tank(s) are to
be furnished by the user.
Use this heater only with a propane vapor
withdrawal supply system. See Chapter 5
of the Standard for Storage and Handling
of Liqueed Petroleum Gas, ANSI/NFPA 58
and the Natural Gas and Propane Installation
Code CSA B149.1. Your local library or re
department will have this booklet.
Keep propane/LP tank(s) at least 5 ft away
from the side of the tent.
The propane/LP tank(s) shall be protected
from vehicles and secured in accordance
with the Standard for Grandstands, Folding
and Telescopic Seating, Tents and Membrane
Structures NFPA 102 and the Standard for
Storage and Handling of Liquieed Petroleum
Gases ANSI/NFPA 58.
The amount of propane gas ready for use
from propane tanks varies. Two factors decide
this amount:
Hand Holds
for Pushing

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120942-01E 7
ELECTRICAL SUPPLY
This heater requires an electrical supply to
be furnished by the user. The electrical outlet
should have the following ratings:
120 volts (+/- 10%), 60 Hertz, 15 Amps
Ground Fault Interrupter (GFI)
The heater uses the ground circuit to prove the
ame by sending a low voltage (40 mV DC)
signal back to the DSI control. If the ground
supply is not correctly wired or is missing, the
heater will not work.

Extension cords used to connect the heater
must be 3 prong, grounded type of proper
gauge. Extension cord requirements are as
follows:
• Up to 100 feet (30 m), use 16 AWG rated
cord
• 101 to 200 feet (32 to 60 m), use 14 AWG
rated cord.
OPERATION WITH PORTABLE
GENERATOR
WARNING: Before operating
heater or any appliance from a
portable generator, verify that
generatorhasbeen properly con-
nected to earth ground. Improper
grounding or failure to ground
generator can result in electro-
cution if a ground fault occurs.

by generator manufacturer for
proper grounding procedures.
The operating voltage range of the heater is
108 to 132 Volts (120 Volts +/- 10%). Prior
to plugging heater into generator the output
voltage should be veried (if generator is
equipped with the automatic idle feature, the
output voltage should be measured with the
generator running at full speed). If the voltage
does not measure in this range the heater
should not be plugged into the generator.
UNPACKING
1. Remove all packing items applied to
heater for shipment. Keep plastic cover
caps (attached to inlet connector and
hose/regulator assembly) for storage.
2. Remove all items from carton.
3. Check all items for shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.

www.desatech.com 120942-01E8
Figure 2 - Cross Section Operational View
Clean
Heated
Air Out
(Front)
Combustion Chamber
Hose/Regulator
Assembly
Injector
Motor and
Blower
Assembly
Cool
Air In
(Back)
Power Cord
Fuel
DSI
Air for Fuel
System
Thermal Switch
Ignitor, Flame
Sensor and ODS
Burner
Air Pressure Switch
THEORY OF OPERATION
The Fuel System: The hose/regulator assembly attaches to the propane gas supply. The
propane gas moves through the automatic control valve and out the injector.
The Air System: The motor turns the fan. The fan pulls air into and around the combustion
chamber. This air is heated and provides a stream of clean, hot air.
The Ignition System: The direct spark ignitor (DSI) sends voltage to the spark ignitor. The
spark ignitor ignites the fuel and air mixture.
 There are 4 independent systems:
1. Flame Sensor: This system causes the heater to shut down if the ame goes out.
2. Thermal Switch: This system causes the heater to shut down if the heater gets too hot
(blocked openings).
3. Air Pressure Switch: The system will not allow the heater to start if there is not adequate
air ow.
4.  This system shuts down the heater if the oxygen level
drops below the specied level (18%).
ODS Operation: Burner porting "blows" out causing ame sensor to cool, shutting down heater.

www.desatech.com
120942-01E 9
ASSEMBLY
Figure 3 - Attaching Handles
Handle
Screw
Nut Lock Washer
Figure 4 - Installing Casters
Nut
Flat Washer
Caster
ASSEMBLY ITEMS
Before assembling heater, make sure you have the items listed below.
• Phillips head screwdriver
• Wrench
• Hardware packet
Handles (2), 3/4" Screws (4), 1/4-20 Nuts (4), 1/4 Flat washers (4), 1/4 Lock washers (4)
Casters (2), 3/8" Nut (2), 3/8 Lock washers (2), 3/8 Flat Washers (4)
Wheels (2), Cotter Pins (2)
Brackets (4), 1/2" black screws (8), 3/8" screws (8)
Note: Place metal parts on packaging during assembly to protect from scratches.

1. Remove casters, 3/8 at washers, 3/8
lock washers and 3/8 nuts from hardware
packet.
2. You may wish to remove side panel from
heater to make installing casters easier.
If so, see Top and Side Panel Removal
on page 14. Figure 4 shows side panel
removed for clarity.
3. Use a spacer to prop end of heater up
so holes in base can be accessed (the 2
wheels stacked on top of each other will
accomplish this).
4. Place a at washer onto threaded stem of
caster. Insert caster stem through hole in
cabinet base as shown in Figure 4.
5. Attach each caster to base with a at
washer, a lock washer and a nut as shown
in Figure 4.
Side Handles
1. Remove handles, 3/4" screws, 1/4-20
nuts, 1/4 at washers and 1/4 lock wash-
ers from hardware packet.
2. Attach each handle to side panels with 2
screws, 2 nuts, 2 at washers and 2 lock
washers. Insert screw from outside of
heater and through handle. From inside
of heater, attach a at washer, then a lock
washer then a nut as shown in Figure 3.
Flat Washer
Lock Washer

www.desatech.com 120942-01E10
Bracket
Top
Bracket
Screws
Figure 6 - Attaching Top
ASSEMBLY
Continued
Figure 5 - Installing Axle and Wheels
Heater
Front
Axle
Wheel
Cotter Pin

1. Locate wheels, washers, cotter pins and
axle in hardware packet.
2. Carefully slide axle through heater body
as shown in Figure 5.
3. Slide one wheel and washer onto axle.
Insert cotter pin into end of axle. See
Figure 5.
4. Repeat steps 2 and 3 for second wheel,
washer and cotter pin on other side of
heater.
3. Turn top over and carefully place over
heater, positioning brackets through slots
in heater front and rear panels.
4. Attach brackets to heater with 3/8" screws.
Bracket
Slots
Washer
Top
1. Remove 4 brackets, (8) 1/2" black screws
and (8) 3/8" screws from hardware
packet.
2. Lay top upside down on a clean surface.
Attach 4 brackets to top with 1/2" black
screws.