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	Preventative Maintenance Schedule...................	8
Unpacking ...........................................................	3	Troubleshooting...................................................	8
Fuels....................................................................	3	Service Procedures...........................................	10
Product Identification...........................................	3	Specifications ....................................................	15
Theory of Operation ............................................	4	Wiring Diagrams................................................	16
Ventilation............................................................	4	Technical Service ..............................................	17
Assembly.............................................................	4	Replacement Parts............................................	17
Operation.............................................................	5	Accessories.......................................................	17
Operation with Portable Generator......................	7	Illustrated Parts Breakdown and Parts List .......	18
Storing, Transporting or Shipping........................	7	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:Thisproductcontainsand/orgenerateschemicals 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 beforetryingtoassemble,operate or service this heater. Improper use of this heater can cause seriousinjuryordeathfromburns,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 serviced. 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 warnings. Keep this manual for reference. It is your guide to safe and proper operation of this heater.

1.Useonlykerosene,#1/#2diesel/fueloil,JETA 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 returning the heater to service.

e)At no time shall more than one day's supply of heater fuel be stored inside a building in the vicinity of the heater. Bulk fuel storage shall be outside the structure.

f)All fuel storage shall be located a minimum 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 donotpermitfueltodripontoorbeignited 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,provideatleasta2800squarecm(three- square-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 ishotoriffuelhasaccumulatedincombustion 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,paintthinners,alcoholorotherhighly 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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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 accordance 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.

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,alcoholorotherhighly 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

•theneedfor nontoxic,anti-iceradditivesin 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.

PRODUCT IDENTIFICATION

	Hot Air	Upper Shell	ON/OFF
			Switch
	Outlet
	Lower
	Shell
	Fuel Cap/
	Gauge

Thermostat	Handle
Knob
	Fan
	Guard
	Extension
	Cord Wrap

Shroud

	Ignition Control
	Control Cover Assembly (On
	Inside of Control	Fuel Tank
	Cover)

Rear Panel

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

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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	Fan Motor	Air Pump Air Intake Filter
Clean			Cool Air In
Heated
Air Out
			Air Output Filter
Fuel
Tank Nozzle	Fuel	Air Line	Ignition Control
	Filter	To Burner	Assembly
Air For Fuel		Air For
		Combustion	Fuel
System
		And Heating

Figure 2 - Cross Section Operational View

VENTILATION

WARNING:Provideafreshair 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 followedtoavoidrisksassociated withcarbonmonoxidepoisoning.

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)

ASSEMBLY

These models are furnished with wheels and a rear handle.Wheels,handleandthemountinghardware 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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ASSEMBLY

Hot Air Outlet

Shroud

Shroud

Axle Hole

Wheel

Spacer

Washer

Wheel

Continued

Air Inlet

Rear Panel

Handle

Washer

Extension

Cord Wrap

Cap Nut	Extended Hub
	Axle

Screw

Figure 3 - Wheel and Handle Assembly

OPERATION

IMPORTANT:ReviewandunderstandthewarningsintheSafety Information section, page 2. They are needed to 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.Locateheatertoprovidemaximumcirculation 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-wireextensioncord.Extension cord must be at least six feet (1.8 meters) long.

Extension Cord Size Requirement

6to10feet(1.8to3meters)long,use18AWG (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.

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.Afterheaterisrunning,adjustthermostatknob tothedesiredsetting.Note:Acoldheatermay affectthethermostatsetting.Thisthermostatis a general-heating control. It is not intended for precisetemperaturecontrol.Adjustthermostat 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.

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OPERATION

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 dis-
connected 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	Thermostat
Switch
		Control
	T
	Temempe	ra
	p
	eraturature
		2	3
		1	4
		LO	5
		Te	6
		ostatoat
			HI
Temperature
Display
Figure 4 - Control Cover with
	Temperature Display

LED Indicator Lights ThesemodelsareequippedwithLEDlightsinorder to help monitor your heater and to help diagnose anypotentialproblemsassociatedwithyourheater. 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.

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

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

Temperature

Temperatura

Vo
l
tage		Flame
	•
Ignitor				•	Encend
	Te
					DémaStar
•	nsión		Llama			i
						do/
		•		•	rre/ t/Run
Allumeu
Encended		Te				Ma
						Operac
r				Flamme		r
		nsio
						che	i
or			n			ón

34

25

1	6
LO	HI
	Thermostat
	Termostato

112935-01

Temperature

Display

Voltage - monitors line voltage during normal operation and indicates improper line voltage. If line voltage falls below 108V or above 132V the heater will shut down.

Start/Run - blinks during “preheat” for 10-15 seconds before ignition and will stay on during normal operation.

Figure 5 - LED Indicator Lights

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OPERATION WITH PORTABLE GENERATOR

WARNING: Before operating heater or any appliance from a portable generator, verify that generatorhasbeenproperlyconnectedtoearthground.Improper grounding or failure to ground generator can result in electrocution if a ground fault occurs. Refertoowner’smanualsupplied 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(ifgeneratorisequippedwiththeautomatic idle feature, the output voltage should be measured withthegeneratorrunningatfullspeed).Ifthevoltagedoesnotmeasureinthisrangetheheatershould not be plugged into the generator.

Refer to Operation, page 5, for starting, stopping and resetting heater procedures.

Alternator Ground Lug

Copper

or Brass

Grounding

Point

Ground Wire (#10 AWG

- Stranded-Copper)

Figure 6 - Typical Generator Grounding Method (Generator construction may vary from that shown)

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.

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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	How Often	How To
Fuel tank	Flushevery150-200hoursofoperation	See Storing, Transporting, or
	or as needed	Shipping, page 7
Air output and lint filters	Replace every 500 hours of operation	See Air Output, Air Intake and
	or once a year	Lint Filters, page 10
Air intake filter	Washanddrywithsoapandwaterevery	See Air Output, Air Intake and
	500 hours of operation or as needed	Lint Filters, page 10
Fuel filter	Clean twice a heating season or as	See Fuel Filter, page 11
	needed
Ignitor	No maintenance required
Fan blades	Clean every season or as needed	See Fan, page 10
Motor	Not required/permanently
	lubricated

TROUBLESHOOTING

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

FAULT CONDITION	POSSIBLE CAUSE		REMEDY
Motor does not start five seconds
after heater is plugged in
INDICATOR LIGHT	1.	No power to heater	1.	Check circuit breaker in elec-
• Ignitor	2.	ON/OFF switch not in the ON		trical panel
			2.	VerifytheON/OFFswitchisin
		(|) position		ON (|) position and light is on
	3.	Thermostat setting is too low	3.	Turn thermostat knob to a
				higher setting

WARNING: High voltage!

4.	Bad electrical connection be-	4.	Check all electrical connec-
	tween motor and ignition con-		tions. See Wiring Diagrams,
	trolassemblyorignitioncontrol		page 16
	assembly and power cord	5.	If fan does not turn freely, see
5.	Binding pump rotor
6.	Blown fuseon ignition control		Pump Rotor, page 14
		6.	SeeIgnitionControlAssembly,
	assembly		page 14
7.	Defective ignition control	7.	Replace ignition control
	assembly		assembly
8.	Defective motor	8.	Replace motor

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TROUBLESHOOTING

Continued

FAULT CONDITION	POSSIBLE CAUSE		REMEDY
Motor starts and runs but heater
does not ignite
INDICATOR LIGHT	1.	No fuel in tank	1.	Fill tank with kerosene
• Flame	2.	Pump pressure incorrect	2.	See Pump Pressure Adjust-
	3.	Dirty fuel filter		ment, page 10
			3.	See Fuel Filter, page 11
	4.	Obstruction in nozzle	4.	See Nozzle Assembly, page 12
	5.	Water in fuel tank	5.	Drain and flush fuel tank with
				clean kerosene. See Storing,
				Transporting or Shipping,
				page 7

					WARNING: High voltage!
•	Ignitor	6. Bad electrical connection				6.	Check electrical connections.
			between ignitor and ignition				See Wiring Diagrams, page 16
			control assembly			7.	Replace ignitor, see page 11
		7.	Defective ignitor
		8.	Defective ignition control			8.	Replace ignition control
			assembly				assembly
•	Voltage	9. Line voltage is below 108V or				9.	Check for proper line voltage
			above 132v
Heaterignitesbutignitioncontrol
assembly shuts heater off after a
short period of time						1.	See Pump Pressure Adjust-
INDICATOR LIGHT		1. Pump pressure incorrect
• Flame		2.	Dirty air intake, air output				ment, page 10
						2.	See Air Output,Air Intake and
			and/or lint filter				Lint Filters, page 10
		3.	Dirty fuel filter			3.	See Fuel Filter, page 11
		4.	Obstruction in nozzle			4.	See Nozzle Assembly, page 12
		5.	Photocellassemblynotproperly			5.	Make sure photocell boot is
			installed (not seeing the flame)				properly seated in bracket
		6.	Dirty photocell lens			6.	Clean photocell lens
					WARNING: High voltage!
•	Voltage	7. Bad electrical connection be-				7.	Check electrical connections.
			tween photocell and ignition				See Wiring Diagrams, page 16
			control assembly			8.	Replace photocell
		8.	Defective photocell
		9.	Defective ignition control			9.	Replace ignition control
			assembly				assembly
		10.Line voltage is below 108Vor				10.Check for proper line voltage.
			above 132v				Disconnect power equipment
							that may be used on same
							line

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SERVICE PROCEDURES

WARNING: To avoid risk of burnandelectricalshock,never attempttoserviceheaterwhileit is plugged in, operating or hot.

UPPER SHELL REMOVAL

1.Removescrewsalongeachsideofheaterusing phillipsscrewdriver.Thesescrewsattachupper and lower shells together. See Figure 7.

2.Lift upper shell off.

3.Remove fan guard.

Screw	Upper Shell
	2
	1

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.Replacefanonmotorshaft.Placefanhubflush with end of motor shaft (see Figure 9).

7.Placesetscrewonflatofshaft.Tightensetscrew firmly (40-50 inch-pounds/4.5-5.6 n-m).

8.Replace upper shell.

	Fan	Setscrew
		Motor	Fan

Setscrew

Motor Shaft

Figure 8 - Fan, Motor

Shaft and Setscrew

Location

Flush

Motor

Shaft

Figure 9 - Fan

Cross Section

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 orreplace air intake filter (see Preventative Maintenance Schedule, page 8).

6.Replace filter end cover.

7.Replace upper shell.

IMPORTANT: Do not oil filters.

Air Intake

Filter

Filter

End

Cover

Lint Filter

Air Output Filter

Figure 10 - Air Output, Air Intake and Lint

Filters

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 Operation, page 5). Allow motor to reach full speed.

Relief

Valve

Pressure

Gauge

Plug

Figure 11 - Pressure Gauge Plug

Removal

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SERVICE PROCEDURES

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	Pressure
			Gauge
	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.

Screw

Control Cover

Fuel Filter,

Bushing and

Lower Fuel Line

Upper Fuel Line

Figure 13 - Fuel Filter Removal

WARNING: HIGH VOLTAGE

WARNING:Toavoidriskofburn and electrical shock, never attempttoserviceheaterwhileitis 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 phillips 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 photocellfrom photocellbracket (see Figure 14).

6.Remove combustion chamber. Stand combustion 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									Nozzle Adapter
									Bracket
Chamber
Air Line Hose									Ignitor
									Ignitor
Photocell									Wire
Bracket
Fuel Line
Hose
Photocell
Assembly									Ignitor
									Wire
T	V
Temperat	ol
emperaure	Ig
tura	nitortage•		Flame
	All•	Ten
	umEnc	si	•				3
	euen	ón	Lla En			1			Ignition
				mF Dcie			5
	rde		•T			2	4
	d		en	a• émarnS
		or	s	la	rda/tart
			io		e/O
			n	mme	Mp
					arc
Control Cover							stato	HI	Control
								6
									Assembly
Figure 14 - Disconnecting Ignitor Wires
from Ignition Control Assembly
(170T Model Shown)

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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 hoseto nozzleadapter assembly.See Fueland 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	Nozzle
	Photocell
		Adapter
	Bracket
		Bracket

Combustion	Nozzle Adapter
Chamber	Bracket Opening
Figure 15 - Ignitor HA1000 Replacement

	Ignitor
Ignitor Element
Photocell	Nozzle
	Adapter
Bracket	Bracket

Nozzle Adapter	Combustion
Bracket Opening	Chamber
Figure 16 - Ignitor HA1100 Replacement

NOZZLE ASSEMBLY

125T and 170T Models Only

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

2.Remove fan (see Fan, page 10).

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

Nozzle/

Adapter

Assembly

Fuel Line

Hose

Air Line Hose

Figure 17 - Removing Air and Fuel Line Hoses (125T and 170T Models Only)

Combustion
Chamber	Nozzle/
	Adapter
	Assembly

Figure 18 - Removing Nozzle/Adapter

Assembly

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SERVICE PROCEDURES

Continued

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

6.Carefullyremovenozzlefromthenozzleadapter 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" socketwrench4.5to5.1N-m(40to45in-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 assembly. See Fuel and Airline Replacement and Proper Routing.

12.Replace fan (see Fan, page 10).

13.Replaceuppershell(seeUpperShellRemoval, page 10).

Nozzle Face	Nozzle	Sleeve
		Nozzle
		Adapter
Nozzle
Air Line Fitting
Fuel 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.

Combustion
Chamber
Nozzle
Adapter
Bracket
Photocell
Bracket			Nozzle/
			Adapter
			Assembly
Air Line			Fuel Line Hose
Hose
Figure 20 - Removing Air and Fuel Line
Hoses (200T Model Only)
Nozzle Face		Nozzle
			Nozzle
		Sleeve
			Adapter
Nozzle
Nozzle
Adapter
Bracket	Air Line		Fuel Line
	Fitting
			Fitting
Figure 21 - Nozzle and Nozzle Adapter
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.Inspectfuelandairlinehosesforcracksand/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 FuelFilter, page 11). If air line hose is damaged, disconnect from nozzle adapter (seeFigure 17,page12orFigure 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 Fuel Filter, page 11) and the other end to nozzle adapter (see Figure 17, page 12 or Figure 20

according to model).

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13

SERVICE PROCEDURES

Continued

Note:RoutehosesasshowninFigure17,page 12 or Figure 20 according to model. Hoses are not to touch photocell bracket.

6.Replace control cover.

7.Replaceuppershell(seeUpperShellRemoval, page 10).

	Pump End
	Cover
	Air Hose	Barb
		Fitting
	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.

7.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 Upper 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.Sandrotorlightlyin“figure8”motion four times (see Figure 25).

16.Reinstall insert and rotor.

17.Perform steps 10 through 12.

Pump Plate

Blade Air

Intake

Filter

Filter End

Cover

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 phillips 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- uctspartnumber113752-01).Donotsubstitute a fuse with a higher current rating. Use an equivalent 6.3 amp time lag, 5 x 20 mm fuse.

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

Fuse Holder

Fuse

T
emp		V
T	era	ol
emperature		Ign tag
	tura	it	e•
		Aor	T	Flame
		ll•E	en						3
		um	si		•
		ncen ón			L		En
		u			la
		rd		•	m		Dci
			ed	Te		a		enS
			o	n		• émardta
			r	s				ra/rt
				io		Flam		e/O
				n				Mp
							me	arc
										6
									os	HI
									tato
										112935-01

Figure 26Replacing Fuse

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113170-01E

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 maintenance. Use in extreme cold temperatures may require nontoxic anti-icer additives.

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WIRING DIAGRAMS

MODELS RH125AT, M125AT, RH170AT, M170AT AND M200AT ONLY

Ignition Control Assembly

Photocell

Photocell

Ignitor

Motor Return

AC Neutral (L2)

120V (L1)

Motor

Ignitor

Blue

Blue	Photocell
				White
	White		Green		Power Plug
				Black	120V/60Hz
	Green	Motor
				5
			Yellow
				4		1
	Red			Black		ON/OFF Switch
	Black
				Thermostat		with Light
	Yellow	Ignitor

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

Control Assembly	113471-01
Ignition

Photocell

Photocell

Temp.

Temp.

Ignitor

Motor Return

AC Neutral (L2)

120V (L1)

Motor

Ignitor

	Temperature
Blue	Sensor
Blue	Photocell
	Thermostat
	Control
	White

White	Green
Green Motor	Black
	5
	Yellow/T

4

Red

Black

Power Plug

120V/60Hz

1

ON/OFF Switch

with Light

Yellow/T Ignitor

16

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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 DESAHeating Productsʼtechnical services web site at www.desatech.com.

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 CentralsarelistedintheAuthorizedServiceCenter booklet supplied with heater.

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 DESAHeating ProductsʼTechnical 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

AIR GAUGE KIT - HA1180

For all models. 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.

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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

13
3	1

9

710

4	5
6		8	11
	23	19
24			12
			15	23
		13	25
			34
31			26
	20	29
32	21	22
				36
				28
18
				14
				13
				16
30
				2
			27
		35		33

17

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