Desa Air Conditioner User Manual

PROPANE CONSTRUCTION FORCED AIR HEATER

OWNER’S MANUAL

VARIABLE 30-55,000, 50-85,000 AND 75-125,000 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.

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.

Safety Information ............................................... 2

Product Identiﬁcation ........................................... 3

Unpacking ........................................................... 3

Theory of Operation ............................................ 4

Propane Supply ................................................... 4

Installation ........................................................... 4

Ventilation ............................................................ 5

Operation ............................................................. 5

Storage ................................................................ 6

TABLE OF CONTENTS

Maintenance ........................................................ 6

Troubleshooting ................................................... 7

Service Procedures ............................................. 8

Speciﬁcations .................................................... 10

Wiring Diagram .................................................. 10

Replacement Parts .............................................11

Technical Service ...............................................11

Illustrated Parts Breakdown and Parts List ....... 12

Warranty and Repair Service ............................ 18

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SAFETY INFORMATION

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 for use as a construction heater in accordance with ANSI Z83.7/CGA2.14. Other standards govern the use of fuel gases and heating products for speciﬁc uses. Your local authority can advise you about these. The primary 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 au

thority 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! Check for proper ventilation and have heater serviced.

Propane Gas: Propane gas is odorless. An odor-

making agent is added to propane gas. The odor helps you detect a propane gas leak. However, the odor added to propane gas can fade. Propane gas may be present even though no odor exists.

Make certain you read and understand all warn ings. Keep this manual for reference. It is your guide to safe and proper operation of this 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 ﬁed Petroleum Gas, ANSI/NFPA 58 and the Propane Gas Installation Code, CAN/CGA B149.2. This instructs on the safe storage and

handling of propane gases.

2. Use only the electrical voltage and frequency speciﬁed on model plate. The electrical con nections and grounding of the heater shall fol low the National Electric Code, ANSI/NFPA 70 or the Canadian Electrical Code, Part 1.

3. Electrical Grounding Instructions - This appli ance is equipped with a three-prong (ground ing) plug for your protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle or extension cord.

4. Use only the hose and factory preset regulator provided with the heater.

5. Use only propane gas set up for vapor with drawal.

6. Provide adequate ventilation. Before using heater, provide at least a three square foot opening of fresh, outside air for each 100,000 Btu/Hr (105,500 k/j) of rating.

7. For indoor use only. Do not use heater out doors.

8. Do not use heater in occupied dwellings or in living or sleeping quarters.

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

lowest possible level.

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

11. Minimum heater clearances from combustible materials:

Outlet: 8 Ft. (2.4 m), Sides: 2 Ft. (0.6 m),

Top: 6 Ft. (1.8 m), Rear: 2 Ft. (0.6 m)

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SAFETY INFORMATION

Continued

12. Keep heater at least six feet from propane tank(s). Do not point heater at propane tank(s) within 20 feet (6.1 m).

13.

Keep propane tank(s) below 100° F (37.8° C).

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

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

16. Locate heater on stable and level surface if heater is hot or operating.

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

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

19. Do not leave heater unattended.

20. Keep children and animals away from heater.

21. Never move, handle or service a hot or operat ing heater. Severe burns may result. You must wait 15 minutes after turning heater off.

22. To prevent injury, wear gloves when handling heater.

23. Never attach duct work to heater.

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

25. Do not use heater if altered.

26. Turn off propane supply to heater and unplug heater when not in use.

27. 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.

PRODUCT

IDENTIFICATION

Hot Air Outlet (Front)

Handle

Fan Guard

Power Cord

Figure 1 - Variable 75-125,000 Btu/Hr

(Heater may vary from illustration)

Inlet Connector

Fuel Valve Button

Hose/Regulator Assembly

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.

Variable Heat Output Control Knob

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THEORY OF OPERATION

Air For Combustion And Heating

Fuel

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 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.

Combustion Chamber

Clean Heated Air Out (Front)

Figure 2 - Cross Section Operational View (Heater may vary from illustration)

The Ignition System: The spark transformer and

spark plug lights the main burner

The Safety Control System: This system causes

the heater to shut down if the ﬂame goes out. Note: Some parts are located differently on some

models.

Nozzle

Fan

Motor

Power Cord

Hose/Regulator Assembly

Cool Air In (Back)

PROPANE SUPPLY

Propane 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 Liqueﬁed Petroleum Gas, ANSI/NFPA 58. Your local library

or ﬁre department will have this booklet. The amount of propane gas ready for use from

propane tanks varies. Two factors decide this amount:

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

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

(45 kg) tanks needed to run this heater.

Number of tanks Temperature Models at tank location 55 85 125

above 20° F (-7° C) 1 1 2

20° F (-7° C) to -0 (-18° C) below -0° F (-18° C) 2 2 (Use larger tank)

1 2 3

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Less gas is vaporized at lower temperatures. You may need two or more 100 pound (45 kg) tanks or one larger tank in colder weather. Your local propane gas dealer will help you select the proper supply system. The minimum surrounding-air tem perature rating for each heater is -20° F (-29° C).

INSTALLATION

WARNING: Review and understand the warnings in the Safety Information section, page

2. They are needed to safely operate this heater. Follow all local codes when using this heater.

WARNING: Test all gas piping and connections 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.

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INSTALLATION

Continued

1. Provide propane supply system (see Propane Supply, page 4).

Connect fuel gas connector fitting on hose/regulator assembly to propane tank(s). Turn counterclockwise into threads on tank valve. Tighten firmly using wrench. IMPORTANT: Tighten regulator with vent pointing down. Pointing vent down protects regulator from weather damage.

3. Connect hose to inlet connector. Tighten ﬁrmly using a wrench. IMPORTANT: Extra hose or piping may be used if needed. Install extra hose or piping between hose/regulator assembly and propane tank. You must use the regulator supplied with heater.

4. Open propane supply valve on propane tank(s)

5. Check all connections for leaks.

6. Close propane supply valve.

Supply Valve

Propane Tank

Figure 3 - Regulator With Vent Pointing

Note: If not opened slowly, excess-

slowly. ﬂow check valve on propane tank may stop gas ﬂow. If this happens, close propane supply valve and open again slowly.

Hose

Regulator

Fuel Gas Connector

Down

Hose Inlet Connector

Figure 4 - Hose and Inlet Connector

(Heater may vary from illustration)

Vent (pointing down)

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 a fresh air opening of at least three square feet for each 100,000 Btu/Hr (105,500 k/j) rating. Provide extra fresh air if more heaters are being used.

OPERATION

WARNING: Review and understand the warnings in the Safety Information section, page

2. They are 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 drafts do not blow into front or rear of heater.

3. Plug power cord of heater into a three-prong, grounded extension cord. Extension cord must be at least six feet (1.83 m) long, UL/CSA listed and of a proper size.

Extension Cord Size Requirement

Up to 100 feet (30.5 m) long, use 16 AWG

rated cord.

101 to 200 feet (30.78 to 61 m) long, use 14

AWG rated cord.

4. Plug extension cord into a 120 volt/60 hertz, three-hole, grounded outlet. Motor will start. Fan will turn, forcing air out front of heater.

5. Open propane supply valve on propane tank(s) slowly. excess-ﬂow check valve on propane tank will stop gas ﬂow. You may hear a click from the excess-ﬂow check valve closing. If this hap pens, reset the excess-ﬂow check valve by closing propane supply valve and open again slowly.

Note: If not opened slowly,

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OPERATION

Continued

6. Press and hold in fuel valve button. Heater should ignite within a few seconds.

Note: If heater fails to ignite, hose may have

air in it. If so, keep fuel valve button pressed and wait 20 seconds. Release automatic control valve button and wait 20 seconds for unburned fuel to exit heater. Repeat step 7.

7. After heater ignites, wait 30 seconds. This ac tivates the automatic control system. Release the control knob.

8. When burner remains lit, set heater at the desired heat level by turning the variable Btu control knob counterclockwise. If burner goes out, turn off gas. Turn variable Btu control knob fully clockwise to the lowest position. Check fuel supply. If adequate fuel is avail able, restart heater beginning at step 1.

TO STOP HEATER

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

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

3. Unplug heater.

STORAGE

CAUTION: Disconnect heater

from propane supply tank(s).

1. Store propane tank(s) in safe manner. See Chapter 5 of Standard for Storage and Han-

dling of Liqueﬁed Petroleum Gases, ANSI/ NFPA 58 and the Propane Installation Code CAN/CGA B149.2. Follow all local codes.

Always store propane tanks outdoors.

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.

MAINTENANCE

WARNINGS

• Never service heater while it is plugged in, connected to propane supply, operating or hot. Severe burns and electrical shock can occur.

• Keep heater clear and free

from combustible materials, gasoline and other ﬂammable vapors and liquids.

• Do not block the ﬂow of combustion or ventilation air.

1. Keep heater clean. Clean heater annually or as needed to remove dust and debris. If heater is

dirty or dusty, clean heater with a damp cloth.

Use household cleaners on difﬁcult spots.

2. Inspect heater before each use. Check connec tions for leaks. Apply mixture of liquid soap and water to connections. Bubbles forming show a leak. Correct all leaks at once.

3. Inspect hose/regulator assembly before each use. If hose is highly worn or cut, replace with hose speciﬁed by manufacturer.

4. Have heater inspected yearly by a qualiﬁed service agency.

5. Keep inside of heater free from combustible and foreign objects. Remove motor and other internal parts if needed to clean inside of heater (see Service Procedures, page 8).

6. Clean fan blades each season or as needed (see Fan, page 8).

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