Desa 125-RN User Manual

GAS-FIRED INFRARED CONSTRUCTION HEATER

OWNER’S MANUAL

MODELS 125-R AND 125-RN

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.

Save this manual for future reference.

For more information, visit www.desatech.com

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

TABLE OF CONTENTS

Product Identiﬁcation ...........................................

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

Theory of Operation ............................................ 3

Gas Supply .......................................................... 4

Ventilation ............................................................

Installation Instructions ........................................ 4

Locating Heater ................................................... 5

Piping .................................................................. 5

Operating Instructions ......................................... 6

Maintenance ........................................................ 7

Speciﬁcations ...................................................... 7

Operating Instructions ......................................... 7

Troubleshooting ................................................... 8

Replacement Parts .............................................. 9

Accessories ......................................................... 9

Illustrated Parts Breakdown and Parts List ....... 10

Warranty and Repair Service ..............Back Cover

SAFETY INFORMATION

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

WARNING: Do not exceed 1/2 psi (14" w.c.) gas pressure to the gas control valve.

The heater is designed for use as a construction heater in accordance with ANSI Z83.7/CGA 2.14. 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 re semble 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 may 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 Liq uefied Petroleum Gas, ANSI/NFPA 58 and the Propane Installation Code, CAN/CGA B149.2. This instructs on the safe storage and

handling of propane gases.

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

3. Use only propane gas set up for vapor with drawal (125-R only).

4. Provide adequate ventilation. Before using heater, provide at least a .35 m opening of fresh, outside air.

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

6. Do not use heater in basement or below ground level.

(3.75 ft2)

www.desatech.com

114248-01B

SAFETY INFORMATION

Continued

7. 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.

Minimum heater clearances from combustibles:

Sides Top

1.54 m (5 ft) 1.22 m (4 ft)

9. Keep heater at least 6.0 m (20 ft) from propane tank(s).

10. Keep propane tank(s) below 38° C (100° F).

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

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

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

14. Not intended for use on finished floors.

15. Never block air inlet (bottom of combustion chamber) or air outlet (glowing combustion chamber) of heater.

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

17. Do not leave heater unattended.

18. Keep children and animals away from heater.

19. Never move, handle or service a hot or operat ing heater. Severe burns may result. Wait 15 minutes after turning heater off.

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

21. Never attach duct work to heater.

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

23. Do not use heater if altered.

24.

Turn off gas supply to heater when not in use

25. 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

Top

Protective Screen

Combustion Chamber

Cover Lighting Port

Control knob

Figure 1 - Product Identiﬁcation

UNPACKING

1. Remove all packing items applied to heater for shipment. Keep plastic cover caps (attached to valve inlet 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: For propane units, the hose/

regulator assembly attaches to the propane gas supply. For natural gas units, the gas supply at taches to the heater through user supplied hose or

pipe. This provides fuel to the heater.

The Ignition System: The piezo ignitor lights the

burner fuel supply.

The Automatic Control System: This system causes

the heater to shut down if the flame goes out.

114248-01B

www.desatech.com

GAS SUPPLY

PROPANE/LP GAS MODEL 125-R ONLY

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 and/or CAN/CGA B149.2. 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 liquid propane gas in tank(s)

2. The temperature of tank(s) The chart below shows the minimum number of 45

kg (100 lb) tanks needed to run the heater. Connect tanks together with a manifold.

Average Temperature Number Of Tanks °C (°F) At Tank Location 45 kg (100 lb)

4° (40°) to 0° (32°) 2 Below 0° (32°) 3

Less gas is vaporized at lower temperatures. Your local propane gas dealer will help you select the proper supply system.

NATURAL GAS MODEL 125-RN ONLY

The user must furnish the natural gas supply and the connections to the heater.

Regulate the natural gas supply down from a mini mum 7" w.c. to a maximum of 1/2 psi. The natural gas supply capacity should be able to supply a minimum of 125 cubic feet of gas at pressure for each heater connected to the system.

Consult your natural gas supplier for proper sizing of the natural gas supply lines.

Follow all local ordinances and codes. In the ab sence of local ordinances and codes, refer to the

National Fuel Gas Code Handbook, NFPA54/ANSI Z223.1 and the Natural Gas Installation Code, CAN/ CGA B149.1

VENTILATION

WARNING: Provide at least a .35 m2 (3.75 ft2) opening of fresh, outside air while running heater. If proper fresh, outside air ventilation is not provided, carbon monoxide poisoning can occur. Provide proper fresh, outside air ventilation before running heater.

INSTALLATION

INSTRUCTIONS

Read these instructions carefully. Read and adhere to these instructions. Do not allow anyone who has not read these instructions to assemble, light, adjust or operate this heater.

Do not attempt to operate the heater with any gas other than that indicated on the heater nameplate.

For the U.S. and/or Canada, the installation of this

appliance must comply with local and/or Provin

cial codes or, in the absence of these codes, with the (U.S.) National Fuel Gas Code, ANSI Z223.1 – Latest Edition (for natural and propane/LP gas operation) and with the (U.S) Standard for the

Storage and Handling of Liqueﬁed Petroleum Gases, ANSI/NFPA 58 (for propane/LP gas opera

tion) or with the current (Canadian) CAN/CGA

B149.1 and B149.2 installation codes. This heater (including hose and regulator assembly

if applicable) must be inspected before each use and at least annually by a qualiﬁed service person. If the hose for model 125-R shows evidence of excessive abrasion or wear or if the hose is cut, it must be replaced prior to the heater being put into operation. The replacement hose assembly shall be that speciﬁed by the manufacturer.

www.desatech.com

114248-01B

LOCATING HEATER

The heater (and propane/LP gas supply cylinder if applicable) must be located on a hard, ﬂat, level surface to minimize the risk of accidental tipping. If an propane/LP gas supply cylinder is used (propane/ LP model only), the cylinder should be adequately restrained to prevent accidental tipping. DO NOT

operate this heater with the supply cylinder in any other than the upright position.

This appliance must be installed only in locations where the potential for physical damage to the appliance (i.e., due to physical contact) is reduced to a minimum.

The installer must inform the owner/operator of this appliance that precautions must be taken to protect the appliance from physical damage.

This appliance produces radiant heat. Therefore, it must be located at least 6 feet away from any propane/LP gas container and must not be directed toward any propane/LP gas container within 20 feet.

The heater must be installed in a location such that it will not be exposed directly to water spray, rain and/or dripping water.

Use of this heater in a draft/windy area decreases its efﬁciency. If possible, operate the unit in a draft free area.

PIPING

FOR MODEL 125-R (FOR USE WITH PROPANE/LP GAS ONLY)

This model may be connected to a self-contained propane/LP gas supply system using the hose and regulator assembly supplied with the appliance OR, it may be connected to a permanently installed propane/LP gas supply system.

If connected to a self-contained propane/LP gas supply system, the hose assembly must be inspected prior to each use of the heater. If it is evident that there is excessive abrasion or wear or if the hose is cut, it must be replaced prior to the heater being put into operation.

WARNING: Never use a fork

lift truck type cylinder.

The connection of model 125-R to a propane/LP cylinder must be made in a well ventilated area using the regulator and hose assembly supplied with the appliance. DO NOT attempt to adjust this regulator. It has been preset at the factory to provide safe and proper operation of the appliance. Use a 7/8" open end wrench to connect

the POL ﬁtting (supplied with the propane/LP regulator) to the propane/LP cylinder. Turn the POL nut in a counterclockwise direction (left hand thread) until tight. DO NOT use pipe compound on POL threads.

The heater must be located at least six feet away from any propane/LP cylinder and must not be directed toward any propane/LP cylinder within 20 feet. If more than one heater is used, they and the supply cylinders must be separated by at least 20 feet.

The gas supply must be turned off at the propane/LP supply cylinder when the heater is not in use.

When the heater is to be stored indoors, the connec tion between the propane/LP supply cylinder and the heater must be disconnected and the cylinder removed from the heater and stored in accordance with Chapter 5 of the Standard for the Storage and

Handling of Liqueﬁed Petroleum Gases. ANSI/ NFPA 58 (U.S.) OR CAN/CGA B149.2 (Canada)

If connected to a permanently installed propane/LP supply system, the system requires the use of a two-stage gas regulator assembly which is nor mally provided by your propane/LP dealer as part of the propane/LP supply system. Consult with your local propane/LP dealer for details concerning proper equipment and installation.

FOR MODEL 125-RN (FOR USE WITH NATURAL GAS ONLY)

Piping must be clean and free from scale or burrs. Install regulator supplied with heater. Connect with

1/2" NPT nipple to control valve. Connect the appliance to an appropriately designed

and installed fuel supply system. This system must include an approved manual shutoff valve which is readily accessible and is located within 6 feet of the appliance. Additionally, a sediment trap or drip leg must be located upstream of this manual shutoff valve. Refer to the appropriate (natural gas) installation code noted above. If a ﬂexible connec tor is used, it must be of an approved type.

WARNING: Never use a ﬂame

for gas leak testing.

114248-01B

www.desatech.com

OPERATING

INSTRUCTIONS

WARNING: If you do not follow these instructions exactly, a ﬁre or explosion may result causing property damage, personal injury or loss of life.

CAUTION: This appliance is hot during normal operation, avoid physical contact.

CAUTION: Do not place clothing or other combustible materials on this appliance.

DO NOT operate this heater if any part has been under water. Call a qualiﬁed service technician to inspect the appliance and to replace any part of the control system or gas control valve which has been under water.

LIGHTING HEATER

1. Before attempting to light the heater, smell all around the heater area for gas. Turn on the gas supply to the appliance and check all ﬁttings and connections for gas leaks using a mild soap and water solution. NEVER use a match to check for gas leaks. Should a gas leak occur, shut off the gas supply to the appliance immediately. Wait a minimum of ﬁve minutes before repairing the leak.

2. Use only the fuel intended for this appliance. Check the appliance rating plate for the correct fuel information.

3. Turn the control knob clockwise to the OFF position. See Figure 1, page 3 and Figure 2 for location of appliance parts.

4. Wait a sufﬁcient length of time (at least ﬁve minutes) to allow gas which may have ac cumulated in burner compartment to escape.

5. Turn on the main gas supply.

6. Turn control knob counterclockwise to the PILOT position.

7a.

Press and turn control knob counterclockwise to PILOT position and hold for 1 to 2 minutes. This may take longer to purge air from supply hose depending on length of the hose being used.

Press red spark ignition button to light pilot ﬂame (repeat until pilot lights) and continue to hold control knob at PILOT position for 30-60 seconds to enable pilot light safety system. Fully turn control knob to HI position to light burner.

7b. To match light the pilot, move the lighting

hole cover aside (see Figure 2) and place a lighted match into hole. Press control knob and hold while lighting and observing pilot burner. Ensure that pilot burner ignites from match. Allow pilot to burn approximately 30 seconds before releasing control knob. If pilot does not remain lit, repeat lighting operation allowing a longer period of time before releasing control knob.

Note: In cases where long runs of gas supply lines have been installed ahead of the appliance, it may be necessary to bleed trapped air out of supply lines before lighting pilot. New installations generally require bleed of supply lines. Wait a minimum of ﬁve minutes after bleeding supply lines before attempting to light heater.

Adjust pilot if necessary as noted under Pilot

Burner Adjustment

8. Turn control knob counterclockwise to the ON position. The burner will light. DO NOT oper ate heater in any position other than full ON.

IMPORTANT: DO NOT attempt to adjust the main burner input using the main gas supply valve. This may cause the pilot and thermocouple to shut down the burner.

Combustion Chamber

Thermocouple

Mounting Brace

Match Lighting Hole Cover

Pilot Assembly

Gas Manifold

Figure 2 - Appliance Parts Identiﬁcation

, page 7.

Control knob

Burner

Filter

www.desatech.com

114248-01B

OPERATING

INSTRUCTIONS

Continued

SHUTTING OFF HEATER

• For short periods of time, turn the main burner off by turning control knob clockwise to the PILOT position.

• For extended periods of non use, turn appli ance completely off by turning control knob clockwise to the PILOT position, press knob slightly, then turn knob fully clockwise to the OFF position. models, also turn off gas supply cylinder.)

Note: For propane/LP gas

PILOT BURNER ADJUSTMENT

1. Remove pilot adjustment cap. The pilot adjust-

ment cap is a slotted screw located in front of the PILOT designation stamped on top of valve body just below control knob.

2. Adjust pilot key to provide properly sized

ﬂame. Rotate the key clockwise to decrease ﬂame or counterclockwise to increase ﬂame.

3. Replace pilot adjustment cap.

MAINTENANCE

WARNING:

• Never attempt to service heater while it is connected to propane supply, operating or hot. Severe burns 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.

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

SPECIFICATIONS

Propane/LP Model 125-R

Rating Fuel Propane Vapor Only Fuel Consumption per Hour

5.17 liters (1.3 gallon)

2.6 kg (5.8 pounds) Supply Pressure To Regulator (for input adjustment)

Maximum 1380 kPa (200 psi)

Minimum 138 kPa (20 psi) Manifold Pressure 2.3 kPa (9.5 inches W.C.) Weight

Heater 17.69 kg (39 lbs) Shipping 20.86 kg (46 lbs)

Size - L x W x H 40.6 x 45.7 x 109.2 cm (16 x 18 x 43 inches)

Min Temperature -29 °C (-20° F) Surrounding Air Temperature

Natural Gas Model 125-RN

Rating Fuel Natural Gas Only Fuel Consumption

per Hour 3.5 m Manifold Pressure 1.5 kPa (6 inches W.C.) Weight

Heater 17.69 kg (39 lbs) Shipping 20.86 kg (46 lbs)

Size - L x W x H 40.6 x 45.7 x 109.2 cm (16 x 18 x 43 inches)

Min Temperature -29 °C (-20° F) Surrounding Air Temperature

125,000 Btu/Hr (131,882 kj)

(125 ft3)

114248-01B

www.desatech.com

TROUBLESHOOTING

WARNING: Never attempt to service heater while it is connected

to propane supply, operating or hot. Severe burns can occur.

SYMPTOM

Burner fails to light

Pilot lights but goes out when automatic control valve button is released

Burn rate is low

POSSIBLE CAUSE

1. Gas supply valve closed

2. Exce ss-flo w ch eck valve closed (p ropane/LP units only)

3. Blockage in burner oriﬁce

4. Piezo ignition system not sparking

1. Not enough warm-up time

2. Low gas pressure

3. Thermocouple loose or needs to be replaced

4. Automatic control valve needs to be replaced

1. Main burner valve not fully open

2. Plugged gas oriﬁces

3. Low gas pressure

4. Low fuel supply

REMEDY

1. Open gas supply valve slowly

2. Close propane supply valve on propane tank and reopen slowly

3. Replace burner oriﬁce

4. Assure ignitor electrode gap is

5.0 mm (.195 in). Check wire lead for damage Replace piezo ignitor and/or ignitor electrode as necessary. Do not bend elec trode, this may cause breakage

1. Relight, hold automatic control valve button in 45 seconds

2. Check for proper gas supply

3. Tighten connection or replace thermocouple

4. Replace automatic control valve

1. Fully open main burner valve by pushing in control knob and turning counterclockwise towards HIGH position until it stops

2. Replace gas oriﬁce

3. Check gas supply; check regulator output

4. Consult gas supplier to determine adequate supply. If using propane/LP gas, the tank could be empty

www.desatech.com

114248-01B

+ 16 hidden pages