Desa AT Series User Manual

PROPANE/LP CONSTRUCTION FORCED AIR HEATER

OWNER’S MANUAL

For more information, visit www.desatech.com

225,000 - 375,000 Btu/Hr With Built-In Thermostat AT Series

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 OF FIRE, EXPLOSION, BURN, ASPHYXIATION, CARBON MONOXIDE POISONING, AND/OR ELECTRICAL SHOCK.

ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW THE INSTRUCTIONS SHOULD USE OR SERVICE THIS HEATER.

IF YOU NEED ASSISTANCE OR HEATER INFORMATION SUCH AS AN INSTRUCTIONS MANUAL, LABELS, ETC. CONTACT THE MANUFACTURER.

TABLE OF CONTENTS

SAFETY INFORMATION ............................................................ 2

PRODUCT IDENTIFICATION ..................................................... 3

UNPACKING ............................................................................... 3

THEORY OF OPERATION ......................................................... 3

PROPANE/LP SUPPLY .............................................................. 4

VENTILATION ............................................................................. 4

INSTALLATION ........................................................................... 4

OPERATION ............................................................................... 5

STORAGE................................................................................... 5

MAINTENANCE .......................................................................... 6

SERVICE PROCEDURE ............................................................ 6

SPECIFICATIONS ...................................................................... 7

ACCESSORIES .......................................................................... 7

TECHNICAL SERVICE ............................................................... 7

SERVICE PUBLICATIONS ......................................................... 7

ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ......... 8

WIRING DIAGRAMS................................................................. 10

REPLACEMENT PARTS .......................................................... 10

OWNER’S REGISTRATION ......................................................11

WARRANTY INFORMATION......................................Back Cover

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SAFETY INFORMATION

WARNINGS

WARNING: This product contains and/or generates chemicals known to the State of California to cause cancer or birth defects, or other reproductive harm.

WARNING: FIRE, BURN, INHALATION, AND EXPLOSION HAZARD. KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING MATERIALS, PAPER OR CARDBOARD, A SAFE DISTANCE AWAY FROM THE HEATER AS RECOMMENDED BY THE INSTRUCTIONS. NEVER USE THE HEATER IN SPACES WHICH DO OR MAY CONTAIN VOLATILE OR AIRBORNE COMBUSTIBLES, OR PRODUCTS SUCH AS GASOLINE, SOLVENTS, PAINT THINNER, DUST PARTICLES OR UNKNOWN CHEMICALS.

WARNING: NOT FOR HOME OR RECREATIONAL VEHICLE USE.

The heater is designed and approved for use as a construction heater under ANSI Z83.7•CGA Z.14-2000 Construction Heater. The purpose of construction heaters is to provide temporary heating of buildings under construction, alteration or repair. Properly used, the heater provides safe economical heating. Products of combustion are vented into the area being heated.

We cannot foresee every use which may be made of our heaters.

Check with your local fire safety authority if you have questions 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.

Carbon Monoxide Poisoning: Some people are more affected by

carbon monoxide than others. Early signs of carbon monoxide poisoning resemble the ﬂu, with headaches, dizziness, and/or nausea. If you have these signs, the heater may not be working properly. Get fresh air at once! Have heater serviced.

Propane/LP Gas: Propane/LP gas 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/LP 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.

• 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 Liquefied Petro-

leum Gas, ANSI/NFPA 58 and the Propane Installation Code, CAN/CGA B149.2. This instructs on the safe storage and han-

dling of propane gases.

• Use only the electrical voltage and frequency specified on model plate. The electrical connections and grounding of the heater shall follow the National Electric Code, ANSI/NFPA 70 or the Canadian Electric Code, Part 1.

• Electrical grounding instructions — This appliance is equipped with a three-prong (grounding) plug for your protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle or extension cord.

• This product has been approved for use in the Commonwealth of Massachusetts.

• For indoor use only. Provide adequate ventilation.

• Keep heater away from strong drafts, wind, water spray, rain, or dripping water.

• Use only in well-vented areas. Before using heater, provide at least a three-square-foot opening of fresh, outside air for each 100,000 Btu/Hr of rating.

• Do not use heater outdoors or in occupied dwellings.

• Do not use heater in living or sleeping quarters.

• Keep appliance area clear and free from combustible materials, gasoline, paint thinner, and other flammable vapors and liquids. Dust is combustible. Do not use heater in areas with high dust content.

• This heater is equipped with a thermostat. Heater may start at anytime.

• Check heater for damage before each use. Do not use a damaged heater.

• Use only propane/LP gas set up for vapor withdrawal.

• Keep propane tank(s) below 100° F.

• Do not use heater in a basement or below ground level. Propane/LP gas is heavier than air. If a leak occurs, propane/LP gas will sink to the lowest possible level.

• Use only the hose and factory regulator provided with the heater.

• Check hose before each use of heater. If highly worn or cut, replace with hose specified by manufacturer before using heater.

• Do not alter heater. Keep heater in its original state.

• Do not use heater if altered.

• Keep heater at least six feet from propane/LP tank(s). Do not point heater at propane/LP tank(s) within 20 feet.

• Minimum heater clearances from combustibles: Outlet: 8 Ft. Sides: 2 Ft. Top: 6 Ft. Rear: 2 Ft.

• Locate heater on stable and level surface if heater is hot or running.

• Keep children and animals away from heater.

• Turn off propane/LP supply and unplug heater when not in use.

• Never block air inlet (rear) or air outlet (front) of heater.

• Never move, handle, or service a hot, operating, or plugged-in heater.

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103018-01G

SAFETY INFORMATION

Air For Combustion Air For Heating

PRODUCT IDENTIFICATION

UNPACKING

THEORY OF OPERATION

SAFETY INFORMATION

Continued

• Never attach duct work to front or rear of heater.

• Use only original replacement parts. This heater must use design-specific parts. Do not substitute or use generic parts. Improper replacement parts could cause serious or fatal injuries.

• Do not adjust regulator below 7 psig or above 20 psig.

PRODUCT IDENTIFICATION

Hot Air Outlet (Front)

Handle

Fan Guard

Outer Shell

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.

THEORY OF OPERATION

The Fuel System: The hose/regulator assembly attaches to the

propane gas supply. The propane gas moves through the solenoid valve and out the nozzle.

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 direct spark ignitor (DSI) sends voltage

to the ignitor. The ignitor ignites the fuel and air mixture.

The Safety Control System: This system causes the heater to shut

down if the flame goes out. The motor will continue to run, but no heat is produced.

On/Off Switch

Inlet Connector

REAR VIEW

Figure 1 - 375,000 Btu/Hr Models

Power Cord

Hose/Regulator Assembly

Thermostat Knob

Combustion Chamber

Ignitor Clean Heated Air Out (Front)

DSI

Nozzle

Figure 2 - Cross Section Operational View

Solenoid Valve

Fan

Motor

Cool Air In (Back)

Power Cord

Hose/ Regulator Assembly

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103018-01G

PROPANE/LP SUPPLY

VENTILATION INSTALLATION

PROPANE/LP SUPPLY

Propane/LP gas and propane/LP tank(s) are to be furnished by the user. Use this heater only with a propane/LP vapor withdrawal supply

system. See Chapter 5 of the Standard for Storage and Handling of

Liquefied Petroleum Gas, ANSI/NFPA 58 and the Propane Installation Code CAN/CGA B149.2. Your local library or fire depart-

ment will have these booklets. The amount of propane/LP gas ready for use from propane/LP tanks

varies. Two factors decide this amount:

1. The amount of propane/LP gas in the tank(s)

2. The temperature of tank(s) The chart below shows the number of 100-pound tanks needed to

run this heater. Do not operate this product with any tank smaller than 100 pounds.

Temperature (°F) Number

At Tank of tanks

40° 3 32° (Use 20° larger

0° tank

-10° below

-20° 40°F)

Less gas is vaporized at lower temperatures. You may need a larger tank in colder weather. Your local propane/LP gas dealer will help you select the proper supply system. The minimum surrounding air temperature rating for each heater is -20°F.

INSTALLATION

WARNING: Review and understand the warnings in the needed to safely operate this heater. Follow all local codes when using this heater.

for leaks after installing or servicing. Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.

1. Provide propane/LP supply system (see Propane/LP Supply).

2. Connect POL fitting on hose/regulator assembly to propane/LP

3. Connect hose to inlet connector. T ighten firmly using a wrench.

4. Open propane/LP supply valve on propane/LP tank(s) slowly.

Safety Information

WARNING: Test all gas piping and connections

tank(s). Turn POL fitting counterclockwise into threads on tank. Tighten firmly using a wrench. tor with black adjustment knob pointing down. Pointing adjustment knob down protects regulator from weather damage.

IMPORTANT:

Install extra hose or piping between hose/regulator assembly and propane/LP tank. Y ou must use the regulator supplied with the heater.

Note:

If not opened slowly, excess-flow check valve on propane/LP tank will stop gas flow . If this happens, you may hear a click inside the regulator assembly . T o reset the excess flow check valve, close propane/LP supply valve and open again slowly.

Extra hose or piping may be used if needed.

section, page 2. They are

IMPORTANT:

Tighten regula-

VENTILATION

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.

Provide at least three square feet of fresh, outside air for each 100,000 Btu/Hr of rating. This heater requires a fresh air opening of at least 11.25 square feet. Provide extra fresh air if more heaters are being used.

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POL Fitting

Hose

Supply Valve

Regulator

Propane/LP Tank

Adjustment Knob (pointing down)

Figure 3 - Regulator With Adjustment Knob Pointing Down

Hose

Inlet Connector

Figure 4 - Hose and Inlet Connector

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INSTALLATION

Continued

5. Adjust regulator between 7 and 20 psig (see Figure 5). Higher regulator setting will allow heater to produce more heat.

6. Check all connections for leaks.

7. Close propane/LP supply valve.

Note:

INSTALLATION

OPERATION

To Start Heater

To Stop Heater

To Restart Heater

STORAGE

6. Make sure regulator is set between 7 and 20 psig. regulator setting will allow heater to produce more heat.

WARNING: Do not adjust regulator below 7 psig or

above 20 psig. Heater may not run properly.

Note:

Higher

WARNING: Do not adjust regulator below 7 psig or

above 20 psig. Heater may not run properly.

5 10 15 20

Regulator

Figure 5 - Adjustable Regulator Set At 7 psig

OPERATION

WARNING: Review and understand the warnings in the needed to safely operate this heater. Follow all local codes when using this heater.

TO START HEATER

1. Follow all installation, ventilation and safety information.

2. Locate heater on stable and level surface. Make sure strong

3. Plug power cord of heater into a three-prong, grounded exten-

4. Plug extension cord into a 120 volt/60 hertz, three-hole,

5. Open propane/LP supply valve on propane/LP tank(s) slowly.

Safety Information

section, page 2. They are

drafts do not blow into front or rear of heater.

sion cord. Extension cord must be at least six feet long. Extension cord must be UL listed.

Extension Cord Size Requirement

Up to 50 feet long, use 18 AWG rated cord. 51 to 100 feet long, use 16 AWG rated cord. 101 to 200 feet long, use 14 AWG rated cord.

grounded outlet.

Note:

7. Turn on/off switch to the ON position. Adjust thermostat to desired setting. If heater does not start, thermostat setting may be too low. Turn thermostat knob to higher position to start heater.

Note:

If heater does not start, turn on/off switch to the OFF posi-

tion. Wait ten seconds for safety control to reset, then try again.

TO STOP HEATER

1. Tightly close propane/LP supply valve on propane tank(s).

2. Wait a few seconds. Heater will burn gas left in supply hoses.

3. Turn on/off switch to the OFF position.

4. Unplug heater.

TO RESTART HEATER

If safety control stops gas flow to heater, motor will continue to run. To restart heater:

1. Turn on/off switch to the OFF position.

2. Wait ten seconds, then turn on/off switch to the ON position.

If heater does not restart

• Check manual valves (if any) and supply valves (on propane/LP

tank). Make sure they are open.

• Check fuel level in propane/LP tank(s). If fuel level is too low,

contact local propane/LP gas company.

If heater still does not restart, contact your local service center.

STORAGE

CAUTION: Disconnect heater from propane/LP

supply tank(s).

1. Store propane/LP tank(s) in safe manner . See chapter 5 of Standard for Storage and Handling of Liquefied Petr oleum Gases, ANSI/NFPA 58 and the Propane Installation Code CAN/CGA B149.2. Follow all local codes.

2. Place plastic cover caps over brass fittings on inlet connector and hose/regulator assembly.

3. Store in dry , clean, and safe place. Do not store hose/regulator assembly inside heater combustion chamber.

4. When taking heater out of storage, always check inside of heater. Insects and small animals may place foreign objects in heater. Keep inside of heater free from combustible and foreign objects.

103018-01G

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