Desa Tech M125AT, M170AT, M200AT, PKHD125T, PKHD170T Owner's Manual

...

PORTABLE FORCED AIR HEATERS

OWNER’S MANUAL

HEATER SIZES:

125,000, 170,000 AND 200,000 BTU/HR

KEROSENE/DIESEL HEATER WITH BUILT-IN THERMOSTAT

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

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

Fuels .................................................................... 3

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

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

Ventilation ............................................................ 4

Assembly ............................................................. 4

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

Operation with Portable Generator ...................... 7

Storing, Transporting or Shipping ........................ 7

Preventative Maintenance Schedule ................... 8

Troubleshooting ...................................................

Service Procedures ........................................... 10

Speciﬁcations ....................................................

Wiring Diagrams ................................................ 16

Technical Service ..............................................

Replacement Parts ............................................ 17

Accessories ....................................................... 17

Illustrated Parts Breakdown and Parts List ....... 18

Warranty and Repair Service ............................ 28

Fill In For Your Records

Model No. __________________ (Located on side panel)

Serial No. __________________ (Located on fuel tank)

Date of Purchase: ____________

Save this manual for future reference.

For more information, visit www.desatech.com

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.

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!

Carbon Monoxide Poisoning: 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 ser- viced. Some people are more affected by carbon monoxide than others. These include pregnant women, persons with heart or lung disease or anemia, those under the inﬂuence of alcohol and those at high altitudes.

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. 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.

2. Fueling a) Personnel involved with fueling shall be

qualiﬁed and thoroughly familiar with the manufacturer's instructions and applicable regulations regarding the safe fueling of heating units.

b) Only the type of fuel speciﬁed on the

heater's data plate shall be used.

c) All flame, including the pilot light, if

any, shall be extinguished and the heater allowed to cool, prior to fueling.

d) During fueling, all fuel lines and fuel-line

connections shall be inspected for leaks. Any leaks shall be repaired prior to return ing the heater to service.

e) At no time shall more than one day's sup-

ply of heater fuel be stored inside a build ing in the vicinity of the heater. Bulk fuel storage shall be outside the structure.

f) All fuel storage shall be located a mini

mum of 762 cm (25 feet) from heaters, torches, welding equipment and similar sources of ignition (exception: the fuel reservoir integral with the heater unit).

g) Whenever possible, fuel storage shall be

conﬁned to areas where ﬂoor penetrations do not permit fuel to drip onto or be ignited by a ﬁre at lower elevation.

h) Fuel storage shall be in accordance with

the authority having jurisdiction.

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

4. Heater must be grounded. Use only a properly grounded three-wire extension cord. Plug into grounded outlet only.

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

6. Minimum clearance from any combustible materials: 8 feet (244 cm) from hot air outlet; 6 feet (183 cm) from top; and 4 feet (120 cm) from sides and inlet.

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

8. Use only in well-vented areas. Before using heater, provide at least a 2800 square cm (threesquare-foot) opening of fresh, outside air for each 30 kw (100,000 Btu/Hr) of rating.

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

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

11. When used with thermostat, heater may start at anytime.

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

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

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

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

16. Never use heater in living or sleeping areas.

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

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113170-01E

SAFETY INFORMATION

Continued

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

19.

Never attach duct work to front or rear of heater.

20. Never attach heater to external fuel tank.

21. Heaters used in the vicinity of tarpaulins, canvas or similar enclosure materials shall be located a safe distance from such materials. The recommended minimum safe distance is

304.8 cm (10 feet). It is further recommended that these enclosure materials be of a ﬁre retardant nature. These enclosure materials shall be securely fastened to prevent them from igniting or from upsetting the heater due to wind action.

22. Unplug heater when not in use.

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

24. Warning to New York City Residents

For Use Only At Construction Sites in ac-

cordance with applicable NYC codes under NYCFD certiﬁcate of approval #4803, #4899, #4908, #4909 or #4934.

UNPACKING

1. Remove all packing items applied to heater for shipment.

2. Remove all items from carton.

3. Check items for any shipping damage. If heater is damaged, promptly inform dealer where you bought heater.

PRODUCT IDENTIFICATION

Hot Air Outlet

Lower Shell

Fuel Cap/ Gauge

Upper Shell

ON/OFF Switch

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: Use a KEROSENE ONLY (blue) or DIESEL ONLY (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.

Thermostat Knob

Handle

Fan Guard

Extension Cord Wrap

Shroud

Ignition Control

Control Cover

113170-01E 3

Assembly (On Inside of Control Cover)

Figure 1 - 125T, 170T and 200T Models

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Fuel Tank

Rear Panel

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.

Fan

Motor

Combustion Chamber

Ignitor

Air Pump

Air Intake Filter

Clean Heated Air Out

Fuel Tank

Nozzle

Air For Fuel System

Figure 2 - Cross Section Operational View

Fuel Filter

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.

Example: A 58.6 kw (200,000 Btu/Hr) heater requires one of the following:

• a two-car garage door [4.88 meter (16 feet) opening] raised 12.7 cm (5 inches)

• a single-car garage door [2.74 meter (9 feet) opening] raised 20.3 cm (8 inches)

• two, 76.2 cm (30 inch) windows raised 38.1 cm (15 inches)

Cool Air In

Air Output Filter

Air Line To Burner

Air For Combustion And Heating

Ignition Control Assembly

Fuel

ASSEMBLY

These models are furnished with wheels and a rear handle. Wheels, handle and the mounting hardware are found in the shipping carton.

Tools Needed

• Medium Phillips Screwdriver

• Rubber Mallet/Hammer

• Flat Blade Screwdriver

1. Slide axle through holes in shroud. Install washers, wheel spacers and wheels on axle as shown in Figure 3, page 5.

IMPORTANT: When installing wheels, point

extended hub of wheels toward shroud (see Figure 3, page 5).

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

3. Install extension cord wraps into handle.

4. Slide handle onto shroud leaving a one inch gap between parts.

5. Place washers onto screws and insert screws into holes in handles.

6. Visually confirm that all six screws are threaded into the shroud. Push the handle completely into the shroud.

7. Tighten all screws.

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113170-01E

T e m p

e r at ur

T e m p e r a

t ur a

Th er m

os t a t

T e r m o s

t a t o

H I

I g n i t or

• E n c en d e d o r

Allu m e u r

V o

l t a g e

• T e n s i ó n

• T e n s

io n

F l a m e

• L l a m

•

S t a r t / R u n

E n c i e n d a / O p e ra c i ó n

D é m ar r

e / M a r c h e

Hot Air Outlet

ASSEMBLY

Continued

Shroud

Shroud Axle Hole

Wheel Spacer

Washer

Wheel

Cap Nut

Extended Hub

Axle

Figure 3 - Wheel and Handle Assembly

OPERATION

IMPORTANT: Review and understand the warnings in the Safety Information section, page 2. They are needed to safely oper ate this heater. Follow all local ordinances and codes when using this heater.

TO START HEATER

1. Follow all ventilation and safety information.

2. Locate heater to provide maximum circulation of the heated air. Follow all location requirements noted in Safety Information, page 2.

3. Fill fuel tank with fuel. 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 ﬂammable fuels.

4. Attach fuel cap/gauge.

5. Plug heaterʼs 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 mm

11 to 100 feet (3.3 to 30.5 meters) long, use

16 AWG (1.0 mm

101 to 200 feet (30.8 to 61 meters) long, use

14 AWG (1.5 mm

) rated cord

Air Inlet

Rear Panel

Handle

Washer

Extension Cord Wrap

Screw

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

7. Turn thermostat knob to the right (clockwise) to the warmest position.

8. Push ON/OFF switch to the ON (|) position. Light will come on. Note: Ignitor will preheat for ﬁve seconds, then heater will start.

9. After heater is running, adjust thermostat knob to the desired setting. Note: A cold heater may 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.

TO STOP HEATER

1. Push ON/OFF switch to the OFF (O) position.

2. Unplug heater.

TO RESET HEATER

1. Push ON/OFF switch to the OFF (O) position and wait 10 seconds. (Wait two minutes if heater has been running.)

2. Repeat steps under To Start Heater

113170-01E 5

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T empe

r a

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tura

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n i to r

• E n

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lu m e u r

Vo l tage

• T

e ns i ó n

•

T e n si

F la m e

• L l a m

• Fl a

m m e

Star

/R u n

E n c ie

n d a /

O pe ra c

ió n

D ém a

rr e / M a r ch

OPERATION

Temperature Temperatura

Thermostat Termostato

Ignitor • Encended

Allumeu

tage •

nsión

• Te

nsio

Flame • Llama • Flamme

Star

t/Run

Encend

do/

Operac

ón

Démarre/

r che

112935-01

Continued

RL, RE AND PKHD SERIES MODELS ONLY

Temperature Display

These models are equipped with a digital tem perature display. The temperature being shown represents the air nearest to the control cover. The temperature of the air in surrounding areas may be much different from the temperature being displayed. The display may show [ - - ] when the thermostat control or temperature sensor are disconnected from the ignition control or if they are or damaged. If this occurs, the safety control will continue to operate as before, however, the unit will not cycle off during operation. See Figure 4.

Lighted ON/OFF Switch

Temperature Display

Thermostat Control

LED Indicator Lights

These models are equipped with LED lights in order to help monitor your heater and to help diagnose any potential problems associated with your heater. Make sure you have read all of the instructions and see Troubleshooting, page 8, before attempting to rectify any problems with your heater.

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

LOGIC ENHANCED IGNITION

These models have an electronically controlled ignition system that is able to detect problems during startup and is able to apply an automatic “choke” to increase the likelihood of ignition. If the heater does not ignite within the ﬁrst second the motor will slow down momentarily. If your heater does not light after the ﬁrst “choke” it will repeat once. If the heater does not ignite after the second “choke” it will shutdown and remain in shutdown mode until the unit is reset. Please refer to Troubleshooting, page 8 in order to properly diagnose the problem.

Figure 4 - Control Cover with

Temperature Display

Ignitor - indicates a problem with the ignitor and can be caused by a damaged or broken ignitor or an ignitor that is wired incorrectly.

Temperature Display

Voltage - monitors line voltage during no rmal op erat i on a nd i n dica t es improper line voltage. If line voltage falls below 108V or above 132V the heater will shut down.

Flame - will illuminate after heater is shut down due to problems associated with the ﬂame or the photocell that monitors the ﬂame.

Figure 5 - LED Indicator Lights

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Start/Run - b l ink s d u rin g “preheat” for 10-15 seconds before ignition and will stay on during normal operation.

113170-01E

FUEL

OPERATION WITH

PORTABLE GENERATOR

WARNING: Before operating heater or any appliance from a portable generator, verify that generator has been properly connected to earth ground. Improper grounding or failure to ground generator can result in electrocution if a ground fault occurs. Refer to owner’s manual supplied 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 veriﬁed (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.

Operation, page 5, for starting, stopping

Refer to and resetting heater procedures.

Alternator

Ground Lug

STORING,

TRANSPORTING OR

SHIPPING

Note: If shipping, transport companies require fuel tanks to be empty.

1. Remove drain plug from bottom side of fuel tank and drain all fuel.

2. Replace drain plug.

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. 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: Do not store kerosene over summer months for use during next heating season. Using old fuel could damage heater.

Copper or Brass Grounding Point

Ground Wire (#10 AWG

- Stranded-Copper)

Figure 6 - Typical Generator Grounding

Method (Generator construction may

vary from that shown)

113170-01E 7

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PREVENTATIVE MAINTENANCE SCHEDULE

WARNING: Never service heater while it is plugged in, operating

or hot. Severe burns and electrical shock can occur.

Item

Fuel tank

Air output and lint ﬁlters

Air intake ﬁlter

Fuel ﬁlter

Ignitor

Fan blades

Motor

How Often

Flush every 150-200 hours of operation or as needed

Replace every 500 hours of operation or once a year

Wash and dry with soap and water every 500 hours of operation or as needed

Clean twice a heating season or as needed

No maintenance required

Clean every season or as needed

Not required/permanently lubricated

How To

See Storing, Transporting, or Shipping, page 7

See Air Output, Air Intake and Lint Filters, page 10

See Fuel Filter, page 11

See Fan, page 10

TROUBLESHOOTING

WARNING: Never service heater while it is plugged in, operating

or hot. Severe burns and electrical shock can occur.

FAULT CONDITION

Motor does not start ﬁve seconds after heater is plugged in INDICATOR LIGHT

• Ignitor

POSSIBLE CAUSE

1. No power to heater

2. ON/OFF switch not in the ON (|) position

3. Thermostat setting is too low

REMEDY

1. Check circuit breaker in electrical panel

2. Verify the ON/OFF switch is in ON (|) position and light is on

3. Turn thermostat knob to a higher setting

WARNING: High voltage!

4. Bad electrical connection between motor and ignition con trol assembly or ignition control assembly and power cord

5. Binding pump rotor

6. Blown fuse on ignition control assembly

7. Defective ignition control

assembly

8. Defective motor

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4. Check all electrical connec

tions. See Wiring Diagrams, page 16

5. If fan does not turn freely, see Pump Rotor, page 14

6. See Ignition Control Assembly, page 14

7. Replace ignition control

assembly

8. Replace motor

113170-01E

FAULT CONDITION

Motor starts and runs but heater does not ignite INDICATOR LIGHT

• Flame

TROUBLESHOOTING

Continued

POSSIBLE CAUSE

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!

REMEDY

1. Fill tank with kerosene

2. See Pump Pressure Adjust ment, page 10

3. See

Fuel Filter, page 11

4. See Nozzle Assembly, page 12

5. Drain and ﬂush fuel tank with clean kerosene. See Storing,

Tran sport in g or Shi pping ,

page 7

• Ignitor

• Voltage

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

• Flame

• Voltage

6. Bad electrical connectio n between ignitor and ignition control assembly

7. Defective ignitor

8. Defective ignition control

assembly

9. Line voltage is below 108V or above 132v

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 be tween photocell and ignition control assembly

8. Defective photocell

9. Defective ignition control

assembly

10.Line voltage is below 108V or above 132v

6. Check electrical connections. See Wiring Diagrams, page 16

7. Replace ignitor, see page 11

8. Replace ignition control

assembly

9. Check for proper line voltage

1. See Pump Pressure Adjust ment, page 10

2. See Air Output, Air Intake and Lint Filters, page 10

3. See Fuel Filter, page 11

4. See Nozzle Assembly, page 12

5. Make sure photocell boot is properly seated in bracket

6. Clean photocell lens

7. Check electrical connections. See Wiring Diagrams, page 16

8. Replace photocell

9. Replace ignition control

assembly

10.Check for proper line voltage. Disconnect power equipment that may be used on same line

113170-01E 9

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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 phillips screwdriver. These screws attach upper and lower shells together. See Figure 7.

2. Lift upper shell off.

3. Remove fan guard.

Screw

Figure 7 - Upper Shell Removal

FAN

IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch (see Figure 8).

1. Remove upper shell (see Figure 7).

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 9).

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

8. Replace upper shell.

Setscrew

Fan

Upper Shell

Setscrew

Motor

Fan

AIR OUTPUT, AIR INTAKE AND LINT FILTERS

1. Remove upper shell (see Figure 7).

2. Remove ﬁlter end cover screws using 5/16" nut-driver (see Figure 10).

3. Remove ﬁlter end cover.

4. Replace air output and lint ﬁlters.

5. Wash or replace air intake ﬁlter (see Preventa tive Maintenance Schedule, page 8).

6. Replace ﬁlter end cover.

7. Replace upper shell.

IMPORTANT: Do not oil ﬁlters.

Air Intake Filter

Lint Filter

Air Output Filter

Figure 10 - Air Output, Air Intake and Lint

Filters

Filter End Cover

PUMP PRESSURE ADJUSTMENT

1. Remove fan guard using medium phillips screwdriver.

2. Remove pressure gauge plug from ﬁlter end cover (see Figure 11).

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

4. Start heater (see motor to reach full speed.

Pressure Gauge Plug

Operation, page 5). Allow

Relief Valve

Motor Shaft

Figure 8 - Fan, Motor

Shaft and Setscrew

Location

Motor Shaft

Figure 9 - Fan

Cross Section

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Flush

Figure 11 - Pressure Gauge Plug

Removal

113170-01E

e T

Ig n it o r

• E n c e n d e d o r

A ll u m e u r

V o l t a g e

• T e n s i ó

• T e n s i o n

F l a m e

• L l a m a

• F la m m e

S t a r t / R u n

n c i e n d a / O p e r

a c i ó n

D é m a r r

e / M a r c h e

SERVICE PROCEDURES

T em

p er

a t

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T em

e r

a tu

r a

T h

s ta

Ig nitor •

d o r

ll um

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V o l

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• T en

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• T

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• L la

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• F

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D émar

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/ M ar

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1 1

2 93

0 1

Continued

5. Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See speciﬁcations below for correct pressure (see Figure 12).

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

Pump

Model Pressure

125T 6.0 PSI 170T 6.0 PSI 200T 6.2 PSI

Figure 12 - Adjusting Pump Pressure

FUEL FILTER

1. Unplug heater.

2. Remove control cover screws using medium phillips screwdriver.

3. Remove control cover.

4. Pull upper fuel line off fuel ﬁlter neck (see Figure 13).

5. Carefully pry bushing, fuel ﬁlter and lower fuel line out of fuel tank (see Figure 13).

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

7. Attach upper fuel line to fuel ﬁlter neck.

8. Replace control cover.

Control Cover

Fuel Filter, Bushing and Lower Fuel Line

Upper Fuel Line

Pressure Gauge

Screw

WARNING: HIGH VOLTAGE

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

IGNITOR

1. Remove upper shell (See Upper Shell Removal, page 10).

2. Remove fan (see page 10).

3. Remove 2 control cover screws with a phil lips screwdriver. Remove control cover (see Figure 13).

4. Disconnect ignitor wires from ignition control assembly (see Figure 14). 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 14).

6. Remove combustion chamber. Stand com bustion chamber on end with nozzle adapter bracket on top (see Figure 15, page 12).

7. Remove ignitor screw with a 1/4" nut driver for models using ignitor HA1000 or 5/16" nut driver for models using ignitor HA1100. Carefully remove ignitor from nozzle adapter bracket.

8. Carefully remove replacement ignitor from styrofoam packing.

Combustion Chamber

Air Line Hose

Photocell Bracket

Fuel Line Hose

Photocell Assembly

Nozzle Adapter Bracket

Ignitor

Ignitor Wire

Ignition

Control Cover

Control Assembly

Figure 14 - Disconnecting Ignitor Wires

from Ignition Control Assembly

Figure 13 - Fuel Filter Removal

113170-01E 11

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(170T Model Shown)

SERVICE PROCEDURES

Continued

CAUTION: Do not bend or strike ignitor element. Handle with care.

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 for models using ignitor HA1000 (see Figure 15) or 5/16" nut driver for models using HA1100 ignitor (see Figure 16). Torque .90 to 1.69 N-m (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 14, page 11).

12.

Replace control cover (see Figure 13, page 11).

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 13.

14. Replace photocell in photocell bracket. Route wires as shown in Figure 17.

15. Replace fan (see page 10).

16. Replace upper shell (see page 10).

Ignitor Screw/Washer Assembly

Ignitor

Ignitor Element Photocell Bracket

Nozzle Adapter Bracket

Ignitor

Ignitor Element

Photocell Bracket

Nozzle Adapter Bracket Opening

Figure 16 - Ignitor HA1100 Replacement

Nozzle Adapter Bracket

Combustion Chamber

NOZZLE ASSEMBLY

125T and 170T Models Only

1. Remove upper shell (see Upper Shell Re moval, page 10).

2. Remove fan (see

3. Remove fuel and air line hoses from nozzle

assembly (see Figure 17).

4. Turn nozzle assembly 1/4 turn to left and pull toward motor to remove (see Figure 18).

Combustion Chamber

Nozzle Adapter Bracket

Photocell Bracket

Fan, page 10).

Nozzle/ Adapter Assembly

Fuel Line Hose

Combustion Chamber

Figure 15 - Ignitor HA1000 Replacement

Nozzle Adapter Bracket Opening

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Air Line Hose

Figure 17 - Removing Air and Fuel Line

Hoses (125T and 170T Models Only)

Combustion Chamber

Figure 18 - Removing Nozzle/Adapter

Assembly

Nozzle/ Adapter Assembly

113170-01E

SERVICE PROCEDURES

Continued

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 19).

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. Tighten 1/3 turn more using 5/8" socket wrench 4.5 to 5.1 N-m (40 to 45 in-lbs). See Figure 19).

10. Attach nozzle assembly to nozzle adapter bracket (see Figure 18, page 12).

11. Attach fuel and airline hoses to nozzle as sembly. See Fuel and Airline Replacement and Proper Routing.

12. Replace fan (see

13. Replace upper shell (see Upper Shell Removal page 10).

Nozzle Face

Nozzle

Air Line Fitting

Figure 19 - Nozzle and Nozzle Adapter

200T Model Only

1. Remove combustion chamber and ignitor by following steps 1 through 7 under Ignitor, page 11.

2. Carefully place the ignitor in a safe location.

3. Remove two nozzle adapter bracket screws (see Figure 20).

4. Place hex-shaped aluminum nozzle adapter into vise (do not overtighten).

5. Carefully remove nozzle from nozzle adapter using 5/8" socket wrench (see Figure 21).

6. Blow compressed air through face of nozzle. This will remove any debris in nozzle.

7. Inspect nozzle seal for damage.

8. Replace nozzle into nozzle adapter until nozzle seats. Tighten 80-110 inch-pounds.

9. Attach nozzle adapter bracket to combustion chamber with two screws removed in step 3.

10. Repeat steps 9 through 16 under Ignitor, page 11.

Fan, page 10).

Nozzle Sleeve

Nozzle Adapter

Fuel Line Fitting

Combustion Chamber

Nozzle Adapter Bracket

Photocell Bracket

Air Line Hose

Figure 20 - Removing Air and Fuel Line

Nozzle Face

Hoses (200T Model Only)

Nozzle Sleeve

Nozzle

Nozzle Adapter Bracket

Figure 21 - Nozzle and Nozzle Adapter

Air Line Fitting

Nozzle/ Adapter Assembly

Fuel Line Hose

Nozzle Adapter

Fuel Line Fitting

FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING

1. Remove upper shell (see Upper Shell Removal, page 10).

2. Remove control cover screws using phillips screwdriver (see Figure 13, page 11).

3. Remove control 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 17, page 12 or Figure 20 according to model) and from fuel ﬁlter (see Fuel Filter, page 11). If air line hose is damaged, disconnect from nozzle adapter (see Figure 17, page 12 or Figure 20 according to model and from barb ﬁtting on pump end cover (see Figure 22, page 14).

5. Install new air and/or fuel line. Attach one end of air line hose to barb ﬁtting on pump end cover (see Figure 22, page 14) and the other end to nozzle adapter (see Figure 17, page 12 or Figure 20 according to model). Attach one end of fuel line hose to fuel ﬁlter (see Filter, page 11) and the other end to nozzle adapter (see Figure 17, page 12 or Figure 20 according to model).

Fuel

113170-01E 13

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SERVICE PROCEDURES

Continued

Note: Route hoses as shown in Figure 17, page

12 or Figure 20 according to model. Hoses are not to touch photocell bracket.

6. Replace control cover.

7. Replace upper shell (see Upper Shell Removal page 10).

Pump End Cover

Air Hose

Figure 22 - Air Hose to Barb Fitting

PUMP ROTOR (Procedure if Rotor is Binding)

1. Remove upper shell (see Upper Shell Removal, page 10).

2. Remove fan guard.

3. Remove ﬁlter end cover screws using 5/16" nut driver (see Figure 23).

4. Remove ﬁlter end cover and air ﬁlters.

5. Remove pump plate screws using 5/16" nutdriver.

6. Remove pump plate.

Remove rotor, insert and blades (see Figure 23).

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

9. Install insert and rotor.

10. Check gap on rotor. Adjust to .076/.101 mm (.003"/.004") if needed (see Figure 24).

Note: Rotate rotor one full turn to ensure the

gap is .076/.101 mm (.003"/.004") at tightest position. Adjust if needed.

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

12. Replace fan guard and upper shell (see Shell Removal, page 10).

13. Adjust pump pressure (see Pump Pressure Adjustment, page 10).

Note: If rotor is still binding, proceed as follows.

14. Perform steps 1 through 6.

15. Place ﬁne grade sandpaper (600 grit) on ﬂat surface. Sand rotor lightly in “ﬁgure 8” motion four times (see Figure 25).

16. Reinstall insert and rotor.

17. Perform steps 10 through 12.

Barb Fitting

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Upper

Pump Plate

Blade

Air Intake Filter

Insert

Rotor

Air Output Filter

Figure 23 - Rotor Location

Gap Adjusting Screw

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

Rotor

Blade

Gap Adjusting Screw

Figure 24 - Gap Adjusting Screw

Locations

Sandpaper

Figure 25 - Sanding Rotor

IGNITION CONTROL ASSEMBLY

WARNING: High voltage!

1. Unplug heater.

2. Remove control cover screws (2) using phil lips screwdriver to expose ignition control assembly (see Figure 11, page 10).

3. Remove fuse from fuse holder.

4. Replace with new fuse (DESA Heating Prod ucts part number 113752-01). Do not substitute a fuse with a higher current rating. Use an equivalent 6.3 amp time lag, 5 x 20 mm fuse.

Replace control cover (see Figure 11, page 10).

Fuse Holder

Figure 26- Replacing Fuse

113170-01E

Filter End Cover

Fuse

SPECIFICATIONS

Model Size 125T 170T 200T

Output Rating (Btu/Hr) 125,000 170,000 200,000 Fuel Use only kerosene, #1/#2 diesel/fuel oil, JET A or JP-8 fuels* Fuel Tank Capacity (U.S. Gal./Liters) 13.5/51 13.5/51 13.5/51 Fuel Consumption

(Gal. Per Hr/Liters Per Hr) .90/3.41 1.25/4.73 1.4/5.3 Pump Pressure (psi) 6.0 6.0 6.2 Electric Requirements 120 V/60 HZ 120 V/60 HZ 120 V/60 HZ Amperage (Normal Run) 3.6 3.6 3.6 Maximum Motor Speed (RPM) 3400 3400 3400 Hot Air Output (CFM) 520 580 600 Motor Horsepower 1/5 1/5 1/4 Shipping Weight 81/36.74 82/37.2 87/39.46

(Approximate Pounds/Kilograms) Heater Weight without Fuel 73/33.11 74/33.57 79/35.86

(Approximate Pounds/Kilograms)

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

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Power Plug

120V/60Hz

Blue

White

Photocell

Ignition Control Assembly

3471-01

Green

Black

Green

Red

Black

Yellow/Tan

Motor

Ignitor

Photocell

Ignitor

Temp.

Temp

Motor Return

AC Neutral (L2)

120V (L1)

Ignitor

Motor

White

ON/OFF Switch

with Light

Thermostat Control

mperature

Sensor

Power Plug

120V/60Hz

Blue

White

Photocell

Ignition Control Assembly

Green

Black

Green

Red

Black

Yellow

Motor

Ignitor

Thermostat

Photocell

Ignitor

Motor Return

AC Neutral (L2)

120V (L1)

Ignitor

Motor

White

ON/OFF Switch

with Light

WIRING DIAGRAMS

MODELS RH125AT, M125AT, RH170AT, M170AT AND M200AT ONLY

125T MODELS: RHD125AT, RL125AT, RE125AT, PKHD125T, TKU125T, UKU125T, RD125T

170T MODELS: RHD170AT, RL170AT, RE170AT, PKHD170T, TKU170T, UKU170T, RD170T

200T Models: RHD200AT, RE200AT, RH200AT, RL200AT, PKHD200T, TKU200T, UKU200T, RD200T

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113170-01E

TECHNICAL SERVICE

You may have further questions about installation, operation or troubleshooting. If so, contact DESA Heating Productsʼ Technical Service Department at 1-866-672-6040. When calling please have your model and serial numbers of your heater ready.

You can also visit DESA Heating Productsʼ techni cal services web site at www.desatech.com.

REPLACEMENT PARTS

Note: Use only original replacement parts. This will protect your warranty coverage for parts replaced under warranty.

PARTS UNDER WARRANTY

Contact authorized dealers of this product. If they canʼt supply original replacement part(s), call DESA Heating Productsʼ Technical Service Dept. at 1-866-672-6040.

When calling DESA Heating Products, have ready:

• your name

• your address

• model and serial numbers of your heater

• how heater was malfunctioning

• purchase date Usually, we will ask you to return the part to the

factory.

PARTS NOT UNDER WARRANTY

Contact authorized dealers of this product. If they canʼt supply original replacement part(s), call DESA Heating Products at 1-866-672-6040 for referral information. Parts dealers are listed in the Authorized Service Center booklet supplied with heater.

When calling DESA Heating Products, have ready:

• model and serial numbers of your heater

• the replacement part number

ACCESSORIES

Purchase accessories and parts from your nearest dealer or service center. If they can not supply these accessories or parts, either contact your nearest parts dealer or DESA Heating Products at 1-866-672-6040 for referral information. Parts Centrals are listed in the Authorized Service Center

booklet supplied with heater.

AIR GAUGE KIT - HA1180

For all model s. Special tool to check pump pressure.

IGNITION CONTROL ASSEMBLY/ PHOTOCELL TESTER - HA1170

For all models. Special tool used to test the ignition control assembly and photocell.

113170-01E 17

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ILLUSTRATED PARTS BREAKDOWN

125T MODELS: RH125AT, RHD125AT, RL125AT, M125AT, RE125AT, PKHD125T, TKU125T, UKU125T, RD125T

170T MODELS: RH170AT, RHD170AT, RL170AT, M170AT, RE170AT, PKHD170T, TKU170T, UKU170T, RD170T

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113170-01E

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