Desa RC40, RC55T, RC70T, RC115T, RC165T Owner's Manual

For more information, visit www.desatech.com

50 SIDE PFA/PV 010A

Models: RC40, RC55T, RC70T,

RC115T and RC165T

CANADIAN PORTABLE

FORCED AIR HEATERS

OWNER’S 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.

TABLE OF CONTENTS

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

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

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

ASSEMBLY................................................................................. 3

THEORY OF OPERATION ......................................................... 4

FUELS......................................................................................... 5

VENTILATION ............................................................................. 5

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

STORING, TRANSPORTING, OR SHIPPING............................ 6

PREVENTATIVE MAINTENANCE SCHEDULE ......................... 6

TROUBLESHOOTING ................................................................ 7

SERVICE PROCEDURES .......................................................... 8

WIRING DIAGRAMS................................................................. 13

SPECIFICATIONS .................................................................... 14

ACCESSORIES ........................................................................ 15

ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST ....... 16

WARRANTY AND REPAIR SERVICE ........................ Back Cover

DESA Industries of Canada, Inc. 2220 Argentina Rd. unit #4 Mississauga, Ontario LSN 2K7

Save this manual for future reference.

SAFETY INFORMATION

WARNINGS

IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate, or service this heater. Improper use of this heater can cause serious injury or death from burns, ﬁre, explosion, electrical shock, and carbon monoxide poisoning.

DANGER: Carbon monoxide poisoning may lead

to death!

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. Some people (such as pregnant women, persons with heart or lung disease, persons with anemia, those under the inﬂuence of alcohol, and those at high altitudes) are more affected by carbon monoxide than others.

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.

• Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels to avoid risk of fire or explosion. Never use gasoline, naphtha, paint thinners, alcohol, or other highly flammable fuels.

• Use only with the electrical voltage and frequency specified on model plate.

• Heater must be grounded. Use only a properly grounded threewire extension cord. Plug into grounded outlet only.

• Use only in areas free of flammable vapors or high dust content.

• Minimum clearance from any combustible materials: 8 feet (244 cm) from hot air outlet; 6 feet (183 cm) from top; and 2 feet (61 cm) from sides and inlet.

• Locate heater on a stable and level surface while hot or operating or a fire may occur.

• Use only in well ventilated areas. Provide ventilation of at least three square feet (2,800 square cm) for each 100,000 Btu/Hr of rating.

• Keep children and animals away from heater at all times.

• Never start heater when combustion chamber is hot or if fuel has accumulated in combustion chamber.

• When used with a thermostat, heater may start at anytime.

• When heater is moved or stored, it must be in a level position or fuel spillage may occur.

• Use heater only in accordance with local ordinances and codes.

• Never use gasoline, crankcase drainings, naphtha, paint thinners, alcohol, or other highly flammable fuels.

• Never use heater where gasoline, paint thinner, or other highly flammable vapors are present.

• Never use heater in living or sleeping areas.

• Never leave a heater plugged in without adult supervision if children or animals are likely to be present.

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

• Never block air inlet at motor end (rear) of heater.

• Never attach duct work to front of heater.

• Never attach heater to external fuel tank.

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105536

PRODUCT IDENTIFICATION

UNPACKING

ASSEMBLY

PRODUCT IDENTIFICATION

Hot Air Outlet

Lower Shell

Fuel Tank

Side Cover

Ignition Control Assembly (assembly on inside of side cover)

Figure 1 - 40 Model

Hot Air Outlet

Lower Shell

Nose Cone Guard

Upper Shell

Nose Cone Guard

Upper Shell

Handle

Fan Guard

Air Filter End Cover

Power Cord

Thermostat Knob

Fan Guard

Fuel Cap

UNPACKING

1. Remove all protective packaging that has been applied to heater

for shipment

2. Remove heater from carton.

3. Check heater for any shipping damage. If damage is found,

promptly inform dealer where heater was purchased.

ASSEMBLY

(FOR 40, 55T, AND 70T MODELS ONLY)

These models are furnished with a nose cone guard. Nose cone guard and mounting screws are found in the shipping carton.

Tools Needed

• 5/16" Nut Driver or Wrench

1. Place nose cone guard on top of upper shell flange. Make sure

nose cone guard is on hot air outlet end of heater.

2. Insert screws through nose cone guard and upper shell flange.

3. Tighten screws firmly.

Nose Cone

Screw

Guard

Fuel Tank

Side Cover

Ignition Control Assembly (assembly on inside of side cover)

Figure 2 - 55T/70T Models

Hot Air Outlet

Lower Shell

Fuel Cap

Side Cover

Ignition Control Assembly (assembly on inside of side cover)

Figure 3 - 115T/165T Models

Upper Shell

Fan Guard

Power Cord

Air Filter End Cover

Power Cord

Thermostat Knob

Fuel Tank

Hot Air Outlet

Upper Shell Flange

Fuel Cap

Figure 4 - Nose Cone Guard Assembly, 40/55T/70T Models Only

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105536

ASSEMBLY THEORY OF OPERATON

ASSEMBLY

Continued

(FOR 115T AND 165T MODELS ONLY)

These models are furnished with wheels and a front handle. Some models are furnished with a rear handle also. Wheels, handle(s), and the mounting hardware is found in the shipping carton.

Tools Needed

• Medium Phillips Screwdriver

• 3/8" Open or Adjustable Wrench

• Hammer

1. Slide axle through wheel support frame. Install wheels on axle.

IMPORTANT:

support frame.

2. Place cap nuts on axle ends. Gently tap with hammer to secure.

3. Place heater on wheel support frame assembly. Make sure air inlet end of heater is over wheels.

4. Place front handle on top of fuel tank flange. Insert screws through handle(s), fuel tank flange and wheel support frame. Attach nut finger tight after each screw is inserted.

5. Tighten all nuts firmly.

Place extended hub of wheel toward wheel

THEORY OF OPERATION

The Fuel System: The air pump forces air through the air line. The

air is then pushed through the nozzle. This air causes fuel to be lifted from the tank. A fine mist of fuel is sprayed into the combustion chamber.

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 ignition control assembly provides

power to the ignitor. This ignites the fuel/air mixture in the combustion chamber.

The Flame-Out Control System: This system causes the heater to

shut down if the flame goes out.

Combustion Chamber

Ignitor

Clean Heated Air Out

Motor

Fan

Air Pump

Air Intake Filter

Cool Air In

Air Output Filter

Screw

Hot Air Outlet

Fuel Tank Flange

Wheel Support Frame

Wheel

Cap Nut

Figure 5 - Wheel and Handle Assembly, 115T/165T Models Only

Nut

Front Handle

Air Inlet

Extended Hub

Axle

Fuel Tank

Figure 6 - Cross Section Operational View

Nozzle

Air For Fuel System

Fuel Filter

Air For Combustion And Heating

Air Line To Burner

Ignition Control Assembly

Fuel

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105536

FUELS

VENTILATION

OPERATION

FUELS

WARNING: Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels to avoid risk of ﬁre or explosion. Never use gasoline, oil drained from crankcases, naphtha, paint thinners, alcohol or other highly ﬂammable fuels.

Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels. Heavier fuels such as No. 2 fuel oil or No. 2 diesel fuel may also be used but will result in:

• noticeable odor

• additional fuel ﬁlter maintenance

• the need for nontoxic, anti-icer additives in very cold weather Do not use fuels heavier than No. 2 grade or heavy oils such as oil

drained from crankcases. These heavy oils will not ignite properly and will contaminate the heater.

IMPORTANT:

(yellow) storage container. Be sure storage container is clean. Foreign matter such as rust, dirt, or water will cause the ignition control assembly to shut down heater. Foreign matter may also require heater's fuel system to be frequently cleaned.

Use a KEROSENE ONLY (blue) or DIESEL ONLY

VENTILATION

WARNING: Provide a fresh air opening of at least three square feet (2,800 square cm) for each 100,000 BTU/HR rating. Provide extra fresh air if more heaters are being used. The minimum ventilation requirements must be followed to avoid risks associated with carbon monoxide poisoning. Make certain these requirements are met prior to operating heater.

OPERATION

IMPORTANT: Review and understand the warnings in the

Safety Information

safely operate this heater. Follow all local ordinances and codes when using this heater.

TO START HEATER

1. Follow all ventilation and safety information.

2. Fill fuel tank with kerosene, #1/#2 diesel/fuel oil, JET A or JP8 fuels.

3. Attach fuel cap.

4. For thermostat models 55T, 70T, 115T, and 165T, turn thermostat knob clockwise to the high position.

5. Plug heater’s power cord into approved, grounded, three-wire extension cord. Extension cord must be at least six feet (1.8 meters) long.

Extension Cord Size Requirement

6 to 10 feet (1.8 to 3 meters) long, use 18 AWG (0.75 mm2) rated cord

11 to 100 feet (3.3 to 30.5 meters) long, use 16 AWG (1.0 mm2) rated cord

101 to 200 feet (30.8 to 61 meters) long, use 14 AWG (1.5 mm2) rated cord

6. Plug extension cord into standard 120 volt/60 hertz, 3-prong grounded outlet. then heater will start.

7. For thermostat models 55T, 70T, 115T, and 165T, adjust thermostat knob to the desired setting. affect the thermostat setting. This thermostat is a general-heating control. It is not intended for precise temperature control. Adjust thermostat until heater cycles at the desired setting.

Note:

section. They are needed to

Ignitor will preheat for five seconds,

Note:

A cold heater may

Example:

• a two-car garage door (16 ft. [4.88 m] wide opening) raised four inches (10.16 cm)

• a single-car garage door (9 ft. [2.74 m] wide opening) raised seven inches (17.78 cm)

• two, thirty-inch (76.20 cm) windows raised twelve inches (30.48 cm)

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A 165 model heater requires one of the following:

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TO STOP HEATER

Unplug extension cord from outlet.

TO RESTART HEATER

1. Unplug extension cord from outlet and wait 10 seconds. (W ait two minutes if heater has been running.)

2. Repeat steps under To Start Heater.

STORING, TRANSPORTING, OR SHIPPING PREVENTATIVE MAINTENANCE SCHEDULE

STORING, TRANSPORTING, OR SHIPPING

Note:

If shipping, transport companies require fuel tanks to be

empty.

1. Drain fuel tank.

Note:

Some models have drain plug on underside of fuel tank.

If so, remove drain plug to drain all fuel. If heater does not have drain plug, drain fuel through fuel cap opening. Be sure all fuel is removed.

2. Replace drain plug if provided.

3. If any debris is noted in old fuel, add 1 or 2 quarts of clean kerosene to tank, stir, and drain again. This will prevent excess debris from clogging filters during future use.

4. Replace fuel cap or drain plug. Properly dispose of old and dirty fuel. Check with local automotive service stations that recycle oil.

5. If storing, store heater in dry place. Make sure storage place is free of dust and corrosive fumes.

IMPORTANT:

during next heating season. Using old fuel could damage heater.

Do not store kerosene over summer months for use

PREVENTATIVE MAINTENANCE SCHEDULE

WARNING: To avoid risk of burn and electrical shock, never attempt to service heater while it is plugged in, operating, or hot.

Item How Often How To

Fuel tank Flush every 150-200 hours See Storing, Transporting, or

of operation or as needed Shipping, above

Air output and lint filters Replace every 500 hours of See Air Output, Air Intake,

operation or once a year and Lint Filters, page 8

Air intake filter Wash and dry with soap and See Air Output, Air Intake,

water every 500 hours of and Lint Filters, page 8 operation or replace as needed

Fuel filter Clean twice a heating season See Fuel Filter, page 9

or replace as needed

Ignitor None required

Fan blades Clean every season or See Fan, page 8

as needed

Motor Not required/permanently

lubricated

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105536

TROUBLESHOOTING

WARNING: Never service heater while it is plugged in, operating, or hot. Severe burns and electrical shock can occur.

TROUBLESHOOTING

FAULT CONDITION

Motor does not start five seconds after heater is plugged in

Motor starts and runs but heater does not ignite

POSSIBLE CAUSE

1. No power to heater

2. Thermostat setting is too low

WARNING: High voltage!

3. Bad electrical connection between motor and ignition control assembly or ignition control assembly and power cord

4. Binding pump rotor

5. Defective ignition control assembly

6. Defective motor

1. No fuel in tank

2. Pump pressure incorrect

3. Dirty fuel ﬁlter

4. Obstruction in nozzle

5. Water in fuel tank

WARNING: High voltage!

6. Bad electrical connection between ignitor and ignition control assembly

7. Defective ignitor

8. Defective ignition control assembly

REMEDY

1. Check circuit breaker in electrical panel

2. Turn thermostat knob to a higher setting

3. Check all electrical connections. See Wiring Diagrams, page 13

4. If fan does not turn freely, see Pump Ro- tor, page 12

5. Replace ignition control assembly

6. Replace motor

1. Fill tank with kerosene

2. See Pump Pressure Adjustment, page 9

3. See Fuel Filter, page 9

4. See Nozzle Assembly, page 11

5. Drain and ﬂush fuel tank with clean kerosene. See Storing, Transporting, or Shipping, page 6

6. Check electrical connections. See Wir- ing Diagrams, page 13

7. Replace ignitor, see page 10

8. Replace ignition control assembly

Heater ignites but ignition control assembly shuts heater off after a short period of time

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105536

1. Pump pressure incorrect

2. Dirty air intake, air output, and/or lint filter

3. Dirty fuel ﬁlter

4. Obstruction in nozzle

5. Photocell assembly not properly installed (not seeing the flame)

6. Dirty photocell lens

WARNING: High voltage!

7. Bad electrical connection between photocell and ignition control assembly

8. Defective photocell

9. Defective ignition control assembly

1. See Pump Pressure Adjustment, page 9

2. See Air Output, Air Intake, and Lint Fil- ters, page 8

3. See Fuel Filter, page 9

4. See Nozzle Assembly, page 11

5. Make sure photocell boot is properly seated in bracket

6. Clean photocell lens

7. Check electrical connections. See Wir- ing Diagrams, page 13

8. Replace photocell

9. Replace ignition control assembly

SERVICE PROCEDURES

WARNING: To avoid risk of burn and electrical shock, never attempt to service heater while it is plugged in, operating, or hot.

UPPER SHELL REMOVAL

1. Remove screws along each side of heater using 5/16" nutdriver. These screws attach upper and lower shells together. See Figure 7 or 8.

2. Lift upper shell off.

3. Remove fan guard.

Screw

Upper Shell

Fan Guard

Figure 7 - Upper Shell Removal (40/55T/70T Models Only)

Screw

Figure 8 - Upper Shell Removal (115T/165T Models Only)

Upper Shell

Fan Guard

FAN

IMPORTANT:

motor from heater. The weight of the motor resting on the fan could damage the fan pitch (see Figure 9).

1. Remove upper shell (see Figure 7 or 8).

2. Use 1/8" allen wrench to loosen setscrew which holds fan to motor shaft.

3. Slip fan off motor shaft.

4. Clean fan using a soft cloth moistened with kerosene or solvent.

5. Dry fan thoroughly.

6. Replace fan on motor shaft. Place fan hub flush with end of motor shaft (see Figure 10).

7. Place setscrew on flat of shaft. T ighten setscrew firmly (40-50 inch-pounds/4.5-5.6 n-m).

8. Replace fan guard and upper shell.

Remove fan from motor shaft before removing

AIR OUTPUT, AIR INTAKE AND LINT FILTERS

1. Remove upper shell (see Figure 7 or 8).

2. Remove filter end cover screws using 5/16" nut-driver. See Figure 11 or 12.

3. Remove filter end cover.

4. Replace air output and lint filters.

5. W ash or replace air intake filter (see Pre ventative Maintenance Schedule, page 6).

6. Replace filter end cover.

7. Replace fan guard and upper shell.

IMPORTANT:

Figure 11 - Air Output, Air Intake, and Lint Filters, 40/55T/70T Models

Figure 12 - Air Output, Air Intake, and Lint Filters, 115T/165T Models

Do not oil filters.

Lint Filter

Air Output Filter

Lint Filter

Air Output Filter

Air Intake Filter

Filter End Cover

Fan Guard

Fan

Setscrew

Motor Shaft

Figure 9 - Fan, Motor Shaft, and Setscrew Location

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Setscrew

Motor

Motor Shaft

Figure 10 - Fan Cross Section

Fan

Flush

105536

SERVICE PROCEDURES

Continued

SERVICE PROCEDURES

PUMP PRESSURE ADJUSTMENT

1. Remove pressure gauge plug from filter end cover (see Figure 13).

2. Install accessory pressure gauge (part number HA1180).

3. Start heater (see Operation, page 5). Allow motor to reach full speed.

4. Adjust pressure. T urn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See specifications correct pressure for each model (see Figure 14).

5. Remove pressure gauge. Replace pressure gauge plug in filter end cover.

Pressure Gauge Plug

Figure 13 - Pressure Gauge Plug Removal (40/55T/70T Models Shown)

Pump

Model Pressure

40 3.0 PSI

55T 3.4 PSI

70 T 4.7 PSI 115T 5.3 PSI 165T 5.6 PSI

Pressure Gauge

Relief Valve

FUEL FILTER

1. Remove side cover screws using 5/16" nut-driver .

2. Remove side cover.

3. Pull upper fuel line off fuel filter neck (see Figure 15 or 16).

4. Carefully pry bushing, fuel filter, and lower fuel line (115T/ 165T models only) out of fuel tank (see Figure 16).

5. Wash fuel filter with clean fuel and replace in tank.

6. Attach upper fuel line to fuel filter neck.

7. Replace side cover.

Fuel Filter

Side Cover

Upper Fuel Line

Figure 15 - Fuel Filter Removal, 40/55T/70T Models

Fuel Filter, Bushing, and Lower Fuel Line

Figure 14 - Adjusting Pump Pressure (40/55T/70T Models Shown)

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105536

Side Cover

Upper Fuel Line

Figure 16 - Fuel Filter Removal, 115T/165T Models

SERVICE PROCEDURES

Continued

IGNITOR

1. Remove upper shell and fan guard (See Upper Shell Removal, page 8).

2. Remove fan (see page 8).

3. Remove 4 side cover screws with a 5/16" nut driver. Remove side cover (see Figures 15 and 16).

4. Disconnect ignitor wires (yellow) from ignition control assembly (see Figure 17). Pull the ignitor wires up through the hole in the lower shell.

5. Disconnect fuel line hose and air line hose. Remove photocell from photocell bracket (see Figure 17).

6. Remove combustion chamber. Stand combustion chamber on end with nozzle adapter bracket on top (see Figure 18).

7. Remove ignitor screw with a 1/4" nut driver . Carefully remove ignitor from nozzle adapter bracket.

Combustion Chamber

Air Line Hose

Fuel Line Hose

Photocell Bracket

Photocell Assembly

Side Cover

Figure 17 - Disconnecting Ignitor Wires from Ignition Control Assembly

Ignitor Screw/Washer Assembly

Ignitor Element

Photocell Bracket

Nozzle Adapter Bracket

Ignitor

Ignitor Wire

(Yellow)

Ignition Control Assembly

Ignitor

Nozzle Adapter Bracket

CAUTION: Do not bend or strike ignitor element.

Handle with care.

8. Carefully remove replacement ignitor from styrofoam packing.

9. Carefully guide ignitor into opening in nozzle adapter bracket. Do not strike ignitor element. Attach ignitor to nozzle adapter bracket with screw using a 1/4" nut driver (see Figure 18). Torque 8 to 15 in. lbs. Do not over torque.

10. Replace combustion chamber.

11. Route the ignitor wires back down through the hole in the lower shell. Connect wires to the ignition control assembly (see Figure 17).

12. Replace side cover (see Figures 15 and 16, page 9).

13. Connect and route fuel line hose and air line hose to nozzle adapter assembly. See Fuel and Air Line Replacement and Proper Routing, page 11.

14. Replace photocell in photocell bracket. Route wires as shown in Figure 19, 20, or 21.

15. Replace fan (see Fan, page 8).

16. Replace fan guard and upper shell (see Upper Shell Removal, page 8).

Combustion Chamber

Burner Strap

Photocell Bracket

Air Line Hose

Figure 19 - Removing Air and Fuel Line Hoses, (40/55T/70T Models Only)

Combustion Chamber

Burner Strap

Photocell Bracket

Nozzle/ Adapter Assembly

Fuel Line Hose

Combustion Chamber

Burner Strap

Photocell Bracket

Air Line Hose

Figure 20 - Removing Air and Fuel Line Hoses, (115T Model Only)

Nozzle/ Adapter Assembly

Fuel Line Hose

Combustion Chamber

Figure 18 - Ignitor Replacement

Nozzle Adapter Bracket Opening

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Air Line Hose

Figure 21 - Removing Air and Fuel Line Hoses (165T Model Only)

Fuel Line Hose

105536

SERVICE PROCEDURES

Continued

SERVICE PROCEDURES

NOZZLE ASSEMBLY

1. Remove upper shell (see Upper Shell Removal, page 8).

2. Remove fan (see Fan, page 8).

3. Remove fuel and air line hoses from nozzle assembly (see Figure 19, 20, or 21, page 10).

4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove (see Figure 22).

5. Place plastic hex-body into vise and lightly tighten.

6. Carefully remove nozzle from the nozzle adapter using 5/8" socket wrench. See Figure 23.

7. Blow compressed air through face of nozzle. This will free any dirt in nozzle area.

8. Inspect nozzle sleeve for damage.

9. Replace nozzle into nozzle adapter until nozzle seats. T ighten 1/3 turn more using 5/8" socket wrench (40-45 inch-pounds). See Figure 23.

10. Attach nozzle assembly to burner strap (see Figure 22).

11. Attach fuel and airline hoses to nozzle adapter assembly. See Fuel and Air Line Replacement and Proper Routing.

12. Replace fan (see Fan, page 8).

13. Replace fan guard and upper shell (see Upper Shell Removal, page 8).

FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING

1. Remove upper shell (see Upper Shell Removal, page 8).

2. Remove side cover screws using 5/16" nut driver (see Figure 15 or 16, page 9).

3. Remove side cover.

4. Inspect fuel and air line hoses for cracks and/or holes. If fuel line hose is damaged, disconnect from nozzle adapter (see Figure 19, 20, or 21, page 10) and from fuel filter (see Fuel Filter, page 9). If air line hose is damaged, disconnect from nozzle adapter (see Figure 19, 20, or 21, page 10) and from barb fitting on pump end cover (see Figure 24).

5. Install new air and/or fuel line. Attach one end of air line hose to barb fitting on pump end cover (see Figure 24) and the other end to nozzle adapter (see Figure 19, 20, or 21, page 10). Attach one end of fuel line hose to fuel filter (see Fuel Filter, page 9) and the other end to nozzle adapter (see Figure 19, 20, or 21, page 10).

Note:

Route hoses as shown in Figure 19, 20, or 21, page 10,

according to model. Hoses are not to touch photocell bracket.

6. Replace side cover.

7. Replace upper shell and fan guard (see Upper Shell Removal, page 8).

Burner Strap

Nozzle Assembly

Figure 22 - Removing Nozzle Assembly, All Models

Nozzle Face

Nozzle Sleeve

Nozzle

Nozzle Adapter

Air Line Fitting

Figure 23 - Nozzle and Nozzle Adapter, All Models

Fuel Line Fitting

Pump End Cover

Barb Fitting

Air Hose

40/55T/70T

Models

Figure 24 - Air Hose to Barb Fitting

Barb Fitting

115T/165T

Models

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105536

SERVICE PROCEDURES

Continued

PUMP ROTOR

(Procedure if Rotor is Binding)

1. Remove upper shell (see Upper Shell Removal, page 8).

2. Remove filter end cover screws using 5/16" nut-driver (see Figure 25 or 26).

3. Remove filter end cover and air filters.

4. Remove pump plate screws using 5/16" nut-driver.

5. Remove pump plate.

6. Remove rotor, insert, and blades.

7. Check for debris in pump. If debris is found, blow out with compressed air.

8. Install insert and rotor.

9. Check gap on rotor. Adjust to .003"/.004" (.076-.101 mm) if needed (see Figure 27).

Note:

Rotate Rotor one full turn to insure the gap is .003"/.004"

(.076-.101 mm) at tightest position. Adjust if needed.

10. Install blades, pump plate, air filters, and filter end cover.

11. Replace fan guard and upper shell (see Upper Shell Removal, page 8).

12. Adjust pump pressure (see Pump Pressure Adjustment, page 9).

Note:

If rotor is still binding, proceed as follows.

13. Perform steps 1 thru 6.

Blade

Pump Plate

Air Intake Filter

Filter End Cover

Fan Guard

Insert

Rotor

OTOR-Domestic

Figure 25 - Rotor Location, 40/55T/70T Models

Air Output Filter

PFA/P 056B

14. Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 28).

15. Reinstall insert and rotor.

16. Perform steps 10 thru 12.

Gap Adjusting Screw

.003"/.004" (.076-.101 mm) Gap Measured With Feeler

Blade

Gap Adjusting Screw

Figure 27 - Gap Adjusting Screw Locations

Figure 28 - Sanding Rotor

Gauge

Rotor

Sandpaper

IGNITION CONTROL ASSEMBLY

WARNING: High Voltage!

1. Unplug heater .

2. Remove side cover screws (4) using 5/16" nut-driver to expose ignition control assembly (see Figure 15 or 16, page 9).

3. Remove fuse cover (see Figure 29).

4. Remove fuse from fuse clips (see Figure 29).

5. Replace fuse with fuse of the same type and rating (GMA-10). Do not substitute a fuse with a higher current rating.

6. Replace fuse cover (see Figure 29).

7. Replace side cover (see Figure 15 or 16, page 9).

Blade

Pump Plate

Air Intake Filter

Insert

Figure 26 - Rotor Location, 115T/165T Models

Rotor

Air Output

OR-Domestic PFA/P 059A

Filter

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Filter End Cover

Fan Guard

Figure 29 - Replacing Fuse

Fuse Clips

Fuse Cover

Fuse

105536

WIRING DIAGRAMS

Photocell

Ignitor

Motor Return

AC Neutral (L2)

120V (L1)

Ignition Control Assembly

Figure 30 - Wiring Diagram for 40 Models

Motor Return

AC Neutral (L2)

Motor

Ignitor

Photocell

Ignitor

Blue Blue

White

Red

Black

Yellow

White

Green

Photocell

Green

Photocell

White

Motor

White

Motor

Ignitor

Green

Yellow

Green

Power Plug

120V/60Hz

Power Plug

120V/60Hz

120V (L1)

Ignition Control Assembly

Figure 31 - Wiring Diagram for 55T/70T/115T/165T Thermostat Models

105536

Motor

Ignitor

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Red

Black

Y ellow

Yellow

Black

Thermostat

Ignitor

SPECIFICATIONS

Model Size 40 55T 70T 115T 165T

Output Rating (Btu/Hr) 40,000 55,000 70,000 115,000 165,000 Fuel Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels* Fuel Tank Capacity

(U.S. Gal./Liters) 3/11.3 5/18.9 5/18.9 9/34 13.5/51

Fuel Consumption

(Gal. Per Hr/Liters Per Hr) .3/1.14 .44/1.67 .52/1.97 .85/3.00 1.2/4.54 Pump Pressure (psi) 3.0 3.4 4.7 5.3 5.6 Electric Requirements 120 V/60 HZ (Same All Models) Amperage (Normal Run) 2.0 2.0 2.8 3.6 3.6 Motor RPM 1725 1725 3440 3440 3440 Hot Air Output (CFM) 170 180 360 490 575 Shipping Weight 32 35 35 53 63

(Approximate Pounds) Heater Weight without Fuel 28 30 30 45 53

(Approximate Pounds)

* Use of #2 diesel & fuel oil will result in noticeable odor and could require additional fuel filter maintenance. Use in extreme cold temperatures may require nontoxic anti-icer additives.

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Desa RC40, RC55T, RC70T, RC115T, RC165T Owner's Manual

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