Espar D3LC Installation Troubleshooting And Parts Manual

D3LC compact Air Heater

Installation
Troubleshooting &
Parts Manual

Espar

December 1998

P/N: 610-102-1298

D3LC compact

Heater Models Release period

12V 25 1906 05 Apr’96 - Mar’97

25 1967 05 Mar’97 - Nov’97
25 1980 05 Nov’97 - Present

24V 25 1907 05 Dec’96 - Feb’97

25 1968 05 Feb’97 - Feb’98
25 1981 05 Feb’98 - Present

Table of contents Page#

Introduction General Specifications 3

Heater Warnings 4
Introduction 5
Principal Dimensions 6
Mounting Pattern 6
Heater Components 7

Installation Procedures Heater Location 8

Heater Mounting 8
Heater Air Ducting 8
Fuel System 10
Electrical Connections 12
Exhaust & Combustion Air Intake Connections 13
Operating Switches 13

Heater Operation Switch On 14

Start Up 14
Temperature Setting 14
Temperature Control 14
Switch Off 14
Controls and Safety Equipment 14
Operation Flow Chart 15

Maintenance, Wiring Diagrams - model 25 1980/1981 16
Troubleshooting Wiring Diagrams - model 25 1967/1968 17

& Repairs Wiring Diagrams - model 25 1906/1907 18

Recommended Periodic Maintenance 19
Basic Troubleshooting 19
Self Diagnostics 20
Fuel Quantity Test 24
Components Specification Chart 24
Repair Steps 25

Heater Parts D3LC compact - Service Parts Diagram 28

D3LC compact - Parts List 32

Special Notes

Note: Highlight areas requiring special attention or clarification.

Caution: Indicates that personal injury or damage to equipment may occur unless specific guidelines are followed.

Warning: Indicates that serious or fatal injury may result if specific guidelines are not followed.

This publication was correct at the time of print. However, Espar Inc. has a policy of continuous improvement and reserves the
right to amend any specifications without prior notice.

3

Heater Warnings

Warning To Installer:

Correct installation of this heater is necessary to
ensure safe and proper operation.
Read and understand this manual before attempting to
install the heater.

Warning - Explosion Hazard

1. Heater must be turned off while re-fueling.

2. Do not install heater in enclosed areas where com-

bustible fumes may be present.

3. Do not install heaters in engine compartments of gaso­line powered boats.

Warning - Fire Hazard

1. Install heater so it will maintain a minimum distance of

2” from any flammable or heat sensitive material.

2. Install the exhaust system so it will maintain a mini­mum distance of 2” from any flammable or heat
sensitive material.

3. Ensure that the fuel system is intact and there are no
leaks.

Failure to follow these instructions could cause fire
resulting in serious or fatal injury.

Warning - Asphyxiation Hazard

1. Route the heater exhaust so that exhaust fumes can-

not enter any passenger compartments.

2. Ensure an air tight seal will be maintained between the
heater and mounting surface and at any exhaust con­nection points.

3. Ensure that heating air supply is taken from an area
where poisonous gases will not be present.

4. If running exhaust components through an enclosed
compartment, ensure that it is vented to the outside.

Failure to follow these instructions could cause oxygen
depletion resulting in serious or fatal injury.

Direct questions to Espar Heater Systems

USA 1-800-387-4800
CDA 1-800-668-5676

4

General Specifications

Heat Output (±10%) 12,000 BTU/hr Boost

11,000 BTU/hr High
5,100 BTU/hr Medium
3,400 BTU/hr Low

Current Draw at 12v (±10%) 20.0 amps/hr - Start

3.0 amps/hr - Boost

3.0 amps/hr - High

1.0 amps/hr - Medium

0.7 amps/hr - Low

Current Draw at 24v (±10%) 10.0 amps/hr - Start

1.50 amps/hr - Boost

1.50 amps/hr - High

0.5 amps/hr - Medium

0.35 amps/hr - Low

Fuel Consumption (±10%) U.S. Litre/hr

Gal/hr
Boost .11 .42
High .10 .37
Medium .05 .18
Low .03 .12

Air Flow (±10%) 78 cfm Boost

78 cfm High
39 cfm Medium
32 cfm Low

Operating Voltage Range 10V or 20V (minimum on 12 or 24V system)

14V or 28V (maximum on 12 or 24V system)

Overheat Temperature 240°F (116°C)
Shutdown (±10%)

Ambient Operating 104°F to 158°F (-40°C to 70°C)
Temperature

Weight 14.3 lbs. (6.5Kg)

Note: The heater control unit is equipped with a low voltage cutout to prevent vehicle battery drain and a high voltage cutout

to protect heater electrical parts.

Introduction

Espar D3LC Compact Air Heater

The Espar D3LCcompact is a diesel-fired 11,000 BTU/HR air
heater, quality engineered to provide a dependable means of
space heating in applications such as small cargo, marine and
cab utilities. This heater is uniquely designed for inside
mounting and an easy installation.

The heater provides a comfortable atmosphere for passen-
ger comfort. Since the heater runs on diesel fuel and
12 or 24 volt power, it is able to perform this completely
independent of the vehicle engine.

The D3LCc is operated by a rheostat switch or room thermo-
stat. It cycles through four temperature settings (boost-high-
medium-low) in order to maintain the desired temperature. If,
in special cases, even less heating capacity is required than
the supplies in the “Low” setting, it switches to the “Off” set­ting.

Temperature and overheat limit switches, and a specially
designed heat exchanger are among the safety features which
make this heater a safe an dependable unit.

5

6

Mounting Pattern

If fastening to the vehicle wall/floor, make penetrations in
accordance with the hole pattern shown. A pre-punched
mounting kit is also available as shown.

Principal Dimensions

Inches

P/N: CA0 00 019

7

Parts List

1 Hot Air Blower Wheel 11 Operating Unit (Rheostat) F = Fresh Air
2 Blower Motor 12 Outer Casing C = Combustion Air
3 Combustion Air Blower Wheel 13 Exhaust Line D = Fuel
4 Glow Plug 14 Flange Seal H = Hot Air
5 Control Unit 15 Fuel Line E = Exhaust
6 Safety Thermal Sensor 16 Main Fuse, 25 A
7 Combustion Chamber 17 Combustion Air Intake Line
8 Flame Monitor 18 Fuel Metering Pump
9 Heat Exchanger 19 Fuel Strainer
10 Operating Unit (Thermostat) 20 7 Day Timer (optional)

Heater Components

Heater Air Ducting

Installation

A 90mm flexible duct 40 inches long, hot air outlet and
clamps are provided with the heater kit. In routing and
installing the ducting the following criteria must be
observed:

• Run ducting with smooth bends. Avoid crushing duct.

• Position hot air outlet so that it cannot be obstructed.

• Use protective air intake grille on air inlet side of heater
to prevent objects from being sucked in.

• Ensure provisions are made for proper air return ventilation.

• Use return air ducting for best heating efficiency

8

Mounting Plate Installation

HEX HEAD TEK SCREW

FLAT WASHER

NUT SPRING WASHER

SILICONE GASKET

S.S. PLATE

PLATE SEAL

Installation Procedures

Heater Location

Depending on the type of vehicle, the best location for mount­ing the heater will vary. Typically, heaters are
mounted inside tool or luggage compartments. However, the
heater may be mounted anywhere inside the
vehicle provided you adhere to the following conditions:

• Combustion air intake, exhaust and fuel inlet must be
located outside of vehicle.

• Heater must be mounted on flat horizontal surface providing
an air tight seal between heater and vehicle.

• Do not mount the heater outside the vehicle, unless care
is taken to protect the heater from the weather.

When selecting the location, consider the following:

• Combustion air and exhaust connections.

• Ducting.

• Fuel line connections.

• Electrical connections.

Heater Mounting

Amounting plate and hardware are provided with the heater kit.

• Choose heater location.

• Using template provided, drill and cut center hole. Cut
one (1) four and one half inch (41/2”) diameter hole or
one rectangular hole four (4”) by five (5”) inches.

• Mount heater on mounting plate with nuts and spring
washers provided.

• For ease of installation make the exhaust, combustion
air intake and fuel connections at base of heater before
mounting the heater into the vehicle.

• Position heater in vehicle and secure with “Tek” screws
provided.

Note: Tighten screws sufficiently to ensure posi-

tive seal between mounting plate and
mounting surface. Do not over tighten.

9

Warning: Do not use existing vehicle ducting or

outlets. Ducts and outlets must be
capable of withstanding a minimum
of 300°F operating temperatures.
To avoid exhaust leakage, the
heater must always be operated
with an end cap installed.

Caution: Do not over tighten duct clamps.

Do not position outlet so that it will
blow hot air directly at operator or at
room thermostat.

Ducting Components

1. Protective Grill 3. Hose Clamp 2-2 3/4” 5. Air Outlet - Rotatable 7. 90° Bend Ducting 2 3/8”

2. Air Outlet Hood 4. Flex Duct 3” or 90mm 6. Connection Piece

Return Ducting

Fuel Pick-Up Pipe Installation (Standard Pick-Up)

• Choose a protected mounting location close to the fuel
pump and heater. A spare fuel sender gauge plate pro­vides an ideal mounting location.

• Drill the mounting holes as shown

• Cut the fuel pick-up pipe to length.

• Mount the fuel pick-up pipe as shown.

• Lower the fuel pick-up pipe (with reinforcing washer) into
the tank using the slot created by the two 1/4” holes.

• Lift the assembly into position through the 1” hole.

• Assemble the rubber washer, metal cup washer and nut.

Note: Drill the two 1/4” holes first.

(Custom Pick-Up Pipe with NPT fitting)

• Remove an existing plug from the top of the fuel tank.

• Cut the fuel pick-up pipe to length.

• Secure the fuel pick-up pipe into position using the
combined NPT compression fitting as shown.

Note: NPT fittings are available in various sizes

(Refer to parts section).

10

Fuel System

The fuel metering pump is the heart of the system and must
be installed properly to ensure a successful heater opera­tion.

Fuel System Overview

Note: Butt joints and clamps on all connections.

Optional

1. Fuel Pick-Up Pipe

2. 5.0 Rubber Connector

3. 11mm Clamp

4. 2.0mm Black Plastic Fuel Line

5. Fuel Metering Pump

6. 9mm Clamp

7. 3.5mm Rubber Connector

8. 1.5mm White Plastic Fuel Line

9. 5mm Rubber Fuel Line

NPT fitting and pipe

11

Fuel Metering Pump

• Choose a protected mounting location close to the

fuel pick-up pipe and heater.

• Using the bracket and rubber mount provided, install

fuel pump as shown

Note: Proper mounting angle of the fuel pump is

necessary to allow any air or vapor in the
fuel lines to pass through the pump rather
than cause a blockage.

Fuel Line

• Route fuel lines from the fuel pick-up pipe to the fuel

metering pump then to the heater.

• Use fuel lines provided.

• Other sizes or types of fuel lines may inhibit proper

fuel flow.

• Make proper butt joints using clamps and connector

pieces as shown on page 8

• Use a sharp utility knife to cut plastic fuel lines to

avoid burrs.

Note: All exposed electrical connections should

be coated with protective grease. (petrole­um gel, Vaseline, etc.).

12

Electrical Connections

Caution:

Install power fuse only after all electrical connections are complete.

Main Harness....................................................................... 11 core harness (red/white, green/red, blue/white, red, white,

grey/red, grey, brown, brown, brown/white and yellow).
Connect to heater control unit (mounted in heater) using the 14 pin
connector then connect glow plug connector.
Place protective hood over glow plug and control unit & secure.
Connect to other harnesses as described for each harness.

Power Harness..................................................................... 2 core harness (red and brown).

Connect red wire to fuse holder near battery.
Connect red fuse link wire to other side of fuse holder.
Connect other end of fuse link wire directly to battery positive post
using ring terminal provided.
Connect brown wire directly to battery negative post using ring ter­minal provided.
Run power harness to main harness - connect 2 pin connectors

Switch Harness.................................................................... 6 core harness (red, brown/white, yellow, grey, brown and grey/red)

Connect to rheostat switch or thermostat (refer to switch connection
section).
Connect switch harness to main harness using 8 pin connector.

Fuel Metering Pump Harness............................................. 2 core harness (green/red and brown).

Connect to fuel metering pump using single terminals and rubber
protective boots (no polarity required).
Connect fuel metering pump harness to main harness using
two single connectors.

Main Harness

Thermostat

Switch Harness

Fuel Metering Pump Harness

Fuse and holder

Power Harness

Electrical Connections

Resistor for models

(12V) 25 1967 05
(24V) 25 1968 05

13

Warning: The exhaust is hot, keep a minimum of

2” clearance from any heat sensitive
material

Warning: Route exhaust so that the exhaust

fumes cannot enter the passenger com­partment.

Exhaust and Combustion Air Intake Connections

A 24mm flexible stainless steel exhaust pipe (39”long) and

a 20mm flexible plastic tube (39” long) for combustion air

intake are included with the heater kit. Exhaust clamps and

holders are also provided.

Caution: Run exhaust and combustion air intakes so

they cannot be plugged by dirt, water or

snow. Ensure the outlets do not face into
the vehicle slip stream.
Keep exhaust and combustion air intake a

minimum of 12” apart.

Drill 1/8” holes where necessary to allow
water drainage.
Balance the exhaust pipe length with the

combustion air intake length.

Combustion air intake and exhaust lengths
can be shortened to a minimum of 8”.

• Attach the exhaust pipe to the exhaust outlet of the
heat exchanger

• Run to an open area to the rear or side of the vehicle
so that fumes cannot build up and enter the cab or the

combustion air inlet to the heater.

• Install protective cap.

• Attach the combustion air intake tube to the combus­tion air inlet of the heater

• Once secure to the heater inlet, the intake pipe must
run to the underside of the vehicle where it will pick up
clean, fresh, moisture free air.

Exhaust (min. 8”).

Operating Switches

The heater can be controlled using a Thermostat or
Rheostat type switch. It can also be accessed by a 7 day
timer with thermostat.

Thermostat

• Mount the thermostat in a location where it is easily
accessible and it’s temperature sensor is representative
of the area being heated.

• Mount using the mounting slots in it’s base.

• Connect the six core switch harness to the thermostat
as shown

Rheostat Switch

Note: When using Rheostat switch, the Return

Ducting method must be used as shown

on page 9. This allows the heater’s internal
sensor to properly monitor cab temperature.

• Mount the rheostat switch in a loca­tion where it is easily accessible.

• Connect the six core switch harness
as shown

Combustion Air Intake
(min. of 8”).

Brown/White - Power from battery “-”
Grey/Red - Temperature setting “+”
Red - Power from battery “+’
Yellow - Switch control to heater
Grey - Temperature sensor

14

7 Day Timer

a - Power from battery “+”
b - Switch control to heater
c - Power from battery “-”
d - Diagnostics from heater
e - Temperature setting “+”
f - Temperature setting “-”
g - Vehicle dimmer switch for light display
h - Vehicle ignition accessories for continuous operation of heater

Heater Operation

Warning: To prevent fire, the heater must be

switched off while filling fuel tanks.
To prevent asphyxiation, the heater
must not be operated in enclosed areas

Switch On

• Switch the heater on using the room thermostat’s,
On/Off switch (1=On, 0=Off ) or the rheostat switch.

Start Up

On start up the indicator light illuminates and the following
sequences take place:

• Control unit does a systems check (glow plug, flame
sensor, temperature sensor, safety thermal sensor).

• Blower starts slowly and begins to accelerate.

• Glow plug is energized and starts preheating the com­bustion chamber.

• After a short delay (approximately 15 seconds) the fuel
pump delivers fuel.

• Ignition will take place as the fuel/air mixture contact
the glow plug.

• Blower speed and fuel delivery are slowly increased.

• Once flame is established the glow plug will switch off.

• Heater will begin heating.

Temperature Setting

Using the adjusting dial, set the desired temperature range.
From 1-4

• Lowest Setting - approx. 10°C (50˚F)

• Mid - Setting - approx. 18°C (65˚F)

• Highest Setting - approx. 30°C (85˚F)

Temperature Control

• The temperature is monitored constantly at the heater
intake or thermostat.

• This temperature is compared to the set temperature
on the adjusting dial.

• The heater cycles through Boost, High, Medium and
Low heat modes to maintain the desired temperature.

• If the desired temperature is exceeded while the heater
is operating in low heat mode the heater will switch off.
This is a comfort feature.

• The heater will re-start in medium heat mode once heat
is again required.

Switch Off

Once switched off either manually or automatically, the
heater begins a controlled cool down cycle.

• The fuel pump stops delivering fuel.

• The glow plug is re-energized for a 15 second after-glow.

• The blower continues to run for 3 minutes and auto­matically switches off.

Controls and Safety Equipment

• If the heater fails to ignite within two 90 second start
attempts, a "no start" shut down occurs.

• If a flame out occurs after the heater has started, the
heater will attempt to restart.

• If repeated flame outs occur within 10 minutes the
heater will not restart.

• Overheat shut down will occur if there is a restriction of
the heating air flow (i.e. blocked inlet or outlet). The
overheat switch will automatically reset once the heater
has cooled down. Once the air flow restriction is
removed, the heater can be re-started by switching the
heater off then back on.

• If the voltage drops below 10.5 volts or rises above

15.9 volts the heater will shut down (21volts and 30
volts for 24 volt systems).

• If the glow plug circuit or fuel metering pump circuit are
interrupted the heater will not start.

• The blower motor is checked on start up and every 4
minutes. Shut down will occur if the blower does not
start or maintain proper speed.

High

Low

Operating
indicating
light

15

Operational Flow Chart

16

Wiring Diagram
D3LCcompact

Glow plug positive pulsed

Models: 25 1980 05 (12v)

25 1981 05 (24v)

17

Wiring Diagram
D3LCcompact

Glow plug positive pulsed
with current regulator

Models: 25 1967 05 (12v)

25 1968 05 (24v)

18

Wiring Diagram
D3LCcompact

Glow plug negative pulsed

Models: 25 1906 05 (12v)

25 1907 05 (24v)

19

Maintenance, Troubleshooting and Repairs

Recommended Periodic Maintenance

• Remove the glow plug and inspect for carbon build up.
Clean or replace.

• Remove the glow plug screen and inspect for carbon
build up. Clean or replace. If cleaning is required, use
brass brush (Espar part number CA0 05 003).

• Make sure vent hole is open. Espar recommends the
use of non detergent 100% volatile carburetor
cleaner and an air gun will also help. Remove loose
carbon from the glow plug chamber.

• Inspect the ducting, the air intake screen and air outlet
for restriction or blockage.

• Inspect combustion air intake and exhaust for blockage.

• Run your heater and check for proper operation during
regular preventative maintenance throughout the year.

• Maintain your batteries and all electrical connections in
good condition. With insufficient power the heater will
not start. Low and high voltage cutouts will shut the
heater down automatically.

• Use fuel suitable for the climate (see engine manufac­turers recommendations). Blending used engine oil
with diesel fuel is not permitted.

Basic Troubleshooting

Check LIst:

What happens when the heater is switched on and ....

Heater does not ignite

Blower motor does not run

Check: • Fuse in power harness.

• Power to control unit.

• Power to switch.

• Electrical connections.

Blower motor runs approximately 20 seconds and then
shuts off

Check: • Ensure voltage at control unit remains

above 9.5 volts during start up with glow
plug circuit on.

Blower motor runs/fuel metering pump starts and then
shuts down after two 90 second start up cycles

Check: • Fuel lines and fuel filter.

• Fuel quantity.

• Combustion air or exhaust tube blockage.

Blower motor runs/no fuel metering pump

Check: • For electrical pulses at fuel metering pump.

• If pump is frozen.

• Blocked fuel line.

Heater ignites

Shuts down at random

Check: • Fuel metering pump quantity.

• Possible overheat.

• Control unit input voltage.

Heater smokes and carbons up

Check: • Exhaust pipe blocked.

• Combustion air intake blocked.

• Exhaust entering combustion air intake pipe.

• Short cycling, rapid on/off operation.

• Fuel system.

• Fuel metering pump quantity.

• Motor rpm.

20

Self Diagnostics

The heater is equipped with self diagnostic capability. To
retrieve information on the heaters last 5 faults, a retrieval
device is required (part # CA1 05 020).

Connect the fault code retrieval device as shown

Equipment Face and Controls

Symbols that are seen on the display face are as follows:

AF Actual fault.

F1-F5 Up to five stored faults can be accessed.

The AF and F1 are the same number.

This sign is displayed when the heater is
in operation.

DIAG The word (Diagnostic) will come on when

the diagnostic number is requested.

000 Three digit diagnostic fault code number.

• Switch the fault code retrieval device on and wait 10
seconds.

• Press the "D" button.

• Wait 3-5 seconds for the current fault code to appear
(AF).

• To review the previous faults use the arrow buttons
(F1= Most Recent, F5= Oldest).

• To erase the faults that are in memory press both "L"
keys at the same time.

• Consult the fault code chart for code number descrip­tions.

Retrieval Device
P/N: CA1 05 020

Retrieval Device
P/N: CA1 05 020

On/Off

21

Note: If there are no heater faults, the heater will go

through a normal start cycle and regulate
based on thermostat setting.

Fault Code Fault Description Causes / Repair

000 Normal Operation

001 Warning - overvoltage Check vehicle charging system.

002 Warning - undervoltage Check batteries and connections.

004 Warning - short in blower signal Check for short between pin 1 to blower relay.

If no short exists replace control unit.

005 Warning - short circuit in anti-theft Check for short between pin 2 and alarm relay.

alarm output

009 TRS - shut down Check for change of signal from (+) to (-) at pin

10 or a (+) signal at pin 12.

010 Overvoltage Check voltage between terminals 5 and 11 on control unit.

This must be less than 15.9 volts or [31.8]

(15.2 [30.4] volts with glow plug on).

Check vehicle charging system. *[24V systems]

011 Undervoltage shut down Check voltage between control unit pins 5 and 11.

This must be greater than 10.5 volts (9.5 volts with glow plug on).

Check batteries and connections.

012 Overheat Check for possible causes of overheat. Check overheat switch

resistance values.(see component value chart).

013 Overheat at flame sensor Flame sensor senses temperature above 340°C (resistance

value above 2270 Ω ). Check flame sensor resistance

values and overheat switch resistance values

(see component value chart).

015 Too many overheats Control unit limits heater to 3 consecutive overheats

(fault code12,13). Remove cause of over heat.

Reset control unit using control unit tester or fault code retrieval

device to unlock control unit.

020 Open circuit - glow plug Check glow plug for break in coils.

Check resistance across glow plug

leads (1-2 Ω). Check for continuity between pins 6 and 9. If afore

mentioned checks okay, replace control unit.

021 Short circuit - glow plug 24 volt equipment only. A 12V glow plug is fitted. test glow plug

for short circuit or examine for carbon deposits on element.

Change if necessary.

22

Fault Code Fault Description Causes / Repair

025 Diagnostics output short Check for short between pin 4 and diagnostics output connection.

033 Burner motor speed deviation Motor speed varies from specification by more than 10% for

longer than 30 seconds. If too slow, check for restriction, and

check for short in motor circuit or control unit. If none found,

replace blower. If too fast, check for damage to magnetic sensor

control on control unit. Replace blower motor if damaged.

Replace control unit otherwise.

047 Short circuit - fuel metering pump Check for short between pin 3 and fuel metering pump.

Test fuel metering pump.

048 Open circuit - fuel metering pump Check for open circuit between pins 3 at control unit and fuel

metering pump.

050 Too many no start attempts Control unit restricts heater to 10 start attempts

(20 starts if no flame is detected during start attempts).

Check fuel, glow plug, combustion air and exhaust flow.

Use control unit tester or fault code retrieval device to unlock

control unit.

051 Faulty flame recognition Allow heater to cool 15 minutes then try restart.

Resistance value at flame sensor > 57°C (1220Ω)

Check flame sensor resistance value.

052 No start safety time exceeded No flame detected on start attempt.

Temperature at flame sensor <100°C(1380 Ω ).

Check flame sensor resistance values. Check fuel, glow plug,

combustion air and exhaust flows.

053 Flame cutout in boost mode Heater has started successfully the flame has extinguished.

054 Flame cutout in high mode Check fuel supply. Check combustion air and exhaust flow.

055 Flame cutout in medium mode If combustion is O.K., check flame sensor resistance value

056 Flame cutout in low mode check flame sensor, replace if necessary.

060 Open circuit - external temperature Temperature sensor detects a value beyond it's range.

sensor Check connections.

061 Short circuit - external temperature Check sensor resistance values between pins 8 &13.

sensor >2800 Ω - open circuit

<280 Ω - short circuit

062 Open circuit - set point Potentiometer values outside of range

potentiometer (control switch) Check resistance between pins 7 and 13.

063 Short circuit - set point >2800 Ω - open

potentiometer (control switch) <280 Ω - short

Normal range 1750 Ω- 2080 Ω (+/- 80Ω).

064 Open circuit - flame sensor Sensor is sensing value outside of range

065 Short circuit - flame sensor >3200 Ω - open

<200 Ω - short

23

071 Open circuit - overheat sensor Overheating sensor signals values outside of range.

072 Short circuit - overheat sensor Check connecting leads.

>3200 Ω - open circuit

<200 Ω - short circuit. See sensor values on next page

090 Control unit defect Internal failure in microprocessor. Replace control unit.

091 External voltage disturbance Check vehicle charging system.

092 Control unit defective Internal failure in microprocessor. Replace control unit.

093 Control unit defective RAM fault

094 Control unit defective EEPROM fault

096 Control unit defective (internal Internal failure.

temperature sensor) Replace control unit or use external temperature sensor.

097 Control unit defective (power failure) Internal failure. Replace control unit.

Fault Code Fault Description Causes / Repair

24

Fuel Quantity Test

The fuel quantity should be tested if the heater has difficulty
starting or maintaining a flame:

Preparation

• Detach the fuel line from the heater.

• Insert the fuel line into a measuring glass (20 cm

3

size).

• Switch the heater on and allow fuel system to bleed out
air for approx. 25 seconds.

• Switch the heater off and empty the measuring glass.

Measurement

• Switch heater on.

• Hold the fuel line in the measuring glass while fuel is
being delivered. Hold the graduated measuring glass at
glow plug height during measurement

• The pump will stop automatically after delivering fuel
for 90 seconds.

• Once fuel pump stops, switch heater off. A restart will
occur if heater is not shut off.

Evaluation

• Read the amount of fuel delivered.

• Fuel quantity should be between

7.1 cm3/90 seconds and 9.5 cm3/90 seconds

8.3 cm3/90 seconds is the nominal value

• If the fuel quantity is outside this range, check for and
remove any restriction in fuel system or replace the fuel
metering pump. (Check screen in suction side of pump)

Note: The fuel quantity is not affected by voltage

variances.

Component Specification Chart

Component values given are reference numbers only
(at room temperature). Actual component values may
vary ±10%.

Motor Speeds

Boost 4,200 RPM
High 4,200 RPM
Medium 2,200 RPM
Low 3,000 RPM
Recirculation 1,000 RPM (when using internal

temperature sensor)

0 RPM when using external

temperature sensor)

Resistance Values

Metering pump 12V approx. 10Ω
Metering pump 24V approx. 36Ω
Glow Plug 12V approx. 0.6 Ω
Glow Plug 24V approx. 2 Ω
Operating control/setpint pot. 1740-2180 Ω (±80Ω)

Exhaust Gas

• CO2 concentration in exhaust gas when heater is run­ning in High heat mode 9-11%.

• Smoke test value from exhaust gas when heater is
running in High heat mode <4.

25

Note: Ensure seam of screen and tab do not

block the air vent hole or fuel port.

Fuel port &
Air vent hole

Repair Steps

Inspection, Removal and Replacement of the:-

Glow Plug

Atomizer Screen

Control Unit

Heater Casing Disassembly

Overheat Sensor

Flame Sensor

Blower Removal and Replacement

Heat Exchanger Cleaning

Glow Plug Removal, Inspection and Replacement

• Remove glow plug connector.

• Remove glow plug.

• Inspect coils for carbon build up, breaks or metal fatigue.

• Clean or replace if necessary.

• Re-install in reverse order using a new gasket.

Atomizer Screen Removal, Inspection and Replacement

• Remove atomizing screen using the metal tab and a
pair of pliers.

• Clean screen using varsol, brass wire brush and com­pressed air.

• Inspect screen for deterioration and replace if necessary.

• Clean the glow plug chamber to remove carbon build up.

• Ensure air vent hole and fuel port are clear.

• Re-install fuel screen.

Disconnect

1. Glow Plug

2. Atomizer Screen

3. Glow Plug Connector

Caution: Remove power from the heater prior

to any disassembly by unplugging main
connection or removing main fuse.

Control Unit Removal and Replacement

• Unplug main harness and motor connectors. (1)

• To remove Control Unit, unlock and slide out. (2)

• Unplug overheat switch & flame sensor connectors. (3)

• Re-install in reverse order.

Control Unit

26

Overheat Sensor

Flame Sensor

Heater Casing Disassembly

• Remove internal hex screw and cap.

• Pry off air outlet hood using a flat screw driver.

• Remove rivets by punching center pin through and pry­ing out base.

• Remove rubber seal at base of heat exchanger.

• Separate outer casing.

• Re-assemble in reverse order using new rivets.

1. Outer Casing

2. Air Outlet Hood

3. Cap with Internal Hex Screw

• Release Duo-Clip locking devices with a screw driver
and detach insulating brackets.

• Use new locking devices when installing

Overheat Sensor Replacement

• Using a small flat screw driver, pry off holding clips.

• Lift sensor from mounting studs.

• Install replacement sensor using new holding clips.

• Ensure the sensor is securely mounted against heat
exchanger.

27

Flame Sensor Replacement

• Using a small flat screw driver, pry off holding spring.

• Remove spring and flame sensor.

• Install replacement sensor using a new mounting spring.

• Ensure the sensor is securely mounted against heat

exchanger

1

3

Air Blower

• Remove four mounting screws.

• Separate blower from heat exchanger.

• Re-assemble using new gasket.

1. Blower

2. Heat Exchanger

3. Gasket

2

Heat Exchanger

• Remove two mounting screws and baffle plate.

• Remove and replace gasket.

• Clean excessive carbon from inside heat exchanger

using a brass wire brush, varsol and compressed air.

• Inspect felt ring and replace if damaged.

• Re-assemble in reverse order using new gaskets.

1

2

3

1. Baffle Plate

2. Gasket

3. Seal Ring

28

Parts Diagram

D3LCcompact

29

30

31

Parts List

D3LCcompact

Ref.Description Part Number

No.

1 Heat exchanger 25 1882 06 00 00 • • • • • •

2 Combustion air blower 12 Volt 25 1906 99 20 00 • • •

24 Volt 25 1907 99 20 00 • • •

3 Flame sensor 25 1895 99 35 00 • • • • • •

4 Safety thermal sensor 25 1895 41 00 00 • • • • • •

*includes cable section

5 Lower half of casing 25 1822 01 01 00 • • • • • •

6 Upper half of casing 25 1906 01 06 00 • • • • • •

7 Control unit 12 Volt 25 1895 50 00 03 • •

24 Volt 25 1896 50 00 02 • •
12 Volt 25 1976 51 00 03 •
24 Volt 25 1977 51 00 02 •

* If replacing the contol unit on heater models 25 1906 and 25 1967
to the latest control unit 12 Volt 25 1976 51 00 03 you must replace the
main heater harness with the p/n. CA1 60 120 harness or follow the conversion

instructions provided with the control unit to modify the existing harness

* If replacing the contol unit on heater models 25 1907 and 25 1968
to the latest control unit 24 Volt 25 1977 51 00 02 you must replace the
main heater harness with the p/n. CA1 60 120 harness or follow the conversion

instructions provided with the control unit to modify the existing harness

8 Flange seal 25 1822 01 00 02 • • • • • •

9 Cable cover 25 1895 01 02 00 • • • • • •

10 Glow plug 12 Volt 25 1830 01 01 00 • • •

24 Volt 25 1831 01 01 00 • • •

11 Seal ring 25 1830 01 01 01 • • • • • •

12 Glow plug screen 25 1822 06 04 00 • • • • • •

13 Gasket, blower 25 1822 01 00 03 • • • • • •

14 Gasket, heat exchanger 25 1822 06 00 02 • • • • • •

15 Seal ring, heat exchanger 25 1862 06 00 03 • • • • • •

16 Spring, flame sensor 25 1895 01 00 03 • • • • • •

17 Clip 171 42 082 • • • • • •

18 Heater bracket 25 1822 01 00 04 • • • • • •

19 Grub screw M6x20 DIN 835 106 10 022 • • • • • •

20 Fillister head bolt M5x20 103 10 461 • • • • • •

21 U-Clip 25 1688 01 00 03 • • • • • •

22 Rivet, black plastic 131 31 051 • • • • • •

23 Fillister head bolt M3x10 25 1822 01 00 05 • • • • • •

24 Gasket 25 1822 80 09 01 • • • •

25 Cable connection 25 1895 01 03 00 • • • •

26 Tapit Screw M5x16 109 00 044 • • • • • •

27 Mounting plate with hardware & seal CA0 00 019 • • • • • •

28 Angle bracket 20 1348 03 00 02 • • • • • •

29 Rubber mount 20 1673 80 01 01 • • • • • •

29a Rubber mount 6mm 20 1185 00 00 01 • • • • • •

30 Clamp for fuel metering pump 152 00 144 • • • • • •

31 Plastic fuel line 1.5mm ID 090 31 118 • • • • • •

32

Heater model

33

Ref.Description Part Number

No.

Heater model

31a Fuel hose 360 75 300 • • • • • •

32 Fuel hose 360 75 350 • • • • • •

33 Plastic fuel line 2mm ID 090 31 125 • • • • • •

34 Fuel metering pump 25 1830 45 00 00 • • •

25 1831 45 00 00 • • •

35 Fuel screen 20 1312 00 00 06 • • • • • •

36 Hose connection 20 1621 45 00 00 • • • • • •

37 Rubber boots 320 31 120 • • • • • •

38 Terminals 18 AWG - fuel metering pump CA1 90 060 • • • • • •

39 Main Harness CA1 60 105 • •

CA1 60 107 • •
CA1 60 120 • •

*40 Fuel pick up pipe (Compression fitting type) CA0 12 042 • • • • • •

*41 Compression fittings 1/4” NPT CA0 12 044 • • • • • •

3/8” NPT CA0 00 031 • • • • • •
1/2” NPT CA0 12 005 • • • • • •

42 Standard fuel pick up pipe 2mm CA0 12 056 • • • • • •

43 Flat plug connector CA1 90 006 • • • • • •

44 Connector housing 206 31 009 • • • • • •

45 Socket housing 206 31 301 • • • • • •

46 Socket connections 206 52 120 • • • • • •

47 Grommet 20 1280 09 01 03 • • • • • •

48 Tie clips 197mm CA1 00 005 • • • • • •

49 "C" Clamp 10mm 152 00 139 • • • • • •

50 Current regulator 25 1966 30 01 00 •

25 1830 30 01 00 •

51 Clamp 9mm 10 2063 00 90 98 • • • • • •

52 Clamp 11mm 10 2063 01 10 98 • • • • • •

53 Blade Fuse (25amp) 204 00 089 • • • • • •

54 Fuse holder with terminals CA1 07 001 • • • • • •

55 Terminals CA1 90 043 • • • • • •

*56 Plastic Screen 75mm 25 1729 89 00 05 • • • • • •

*57 Flange for outlet grill 25 1226 89 00 12 • • • • • •

*58 Clamp 52mm-82mm CA1 10 041 • • • • • •

59 Safety screen 75mm 25 1552 05 01 00 • • • • • •

60 Outlet hood 75mm 25 1822 80 01 00 • • • • • •

61 Clamp 3 inch(75mm) CA1 10 041 • • • • • •

Clamp 4 inch(100mm) CA1 10 042 • • • • • •

62 Flexible air hose 75mm 10 2114 34 00 00 • • • • • •

63 Deflector 75/100mm 22 1050 89 21 00 • • • • • •

*64 90° Air outlet hood 22 1000 01 00 03 • • • • • •

65 C clamp 152 10 051 • • • • • •

66 Flexible exhaust hose 25 1774 80 01 00 • • • • • •

34

Heater model

67 Clamp 26mm 152 61 102 • • • • • •

68 Clamp 10 2064 02 00 32 • • • • • •

69 Air intake silencer 20 1451 01 01 00 • • • • • •

70 C clamp 152 10 047 • • • • • •

71 End sleeve with cross bar 25 1729 89 00 02 • • • • • •

*72 Fibre ring adapter 90mm- 4” (Wooden) CA2 02 002 • • • • • •

90-100mm (Plastic) 20 1602 80 00 01 • • • • • •

73 End sleeve with cross bar 25 1729 80 06 00 • • • • • •

74 Switch/ Thermostat harness (15’) CA1 70 111 • • • • • •

75 Fuel metering pump harness (20’) CA1 75 015 • • • • • •

76 Power harness (13’) CA1 65 106 • • • • • •

77 Thermostat 12 Volt 301 00 154 • • •

24 Volt 301 00 153 • • •

*78 Operating switch (rotary) 12 Volt 25 1895 71 00 00 • • •

24 Volt 25 1896 71 00 00 • • •

*79 7 day timer 22 1000 30 40 00 • • • • • •

80 3/8” Ring terminal 10-12G CA1 90 014 • • • • • •

81 Plug and socket connector 206 00 040 • • • • • •

82 Terminals CA1 900 21 • • • • • •

83 D3LCc North American manual (not shown) 610 102 1298 • • • • • •

*84 Fault code retrieval device (shown pg. 20) CA1 05 020 • • • • • •

* indicates optional features

Ref.Description Part Number

No.

Service History Notes

Serial N°:________________________ Date installed:_______________________

Model N°:________________________

Date Service Details

1st. Printing - November 1998

Printed in Canada

P/N: 610-102-1298

Espar Products, Inc.

6435 Kestrel Road

Mississauga, Ontario

Canada L5T 1Z8

17672 N. Laurel Park Drive

Suite 400E

Livonia, Michigan

United States

48152-3984

Canada (Tel): 905-670-0960

800-668-5676

Fax: [phone]

U.S. (Tel): 800-387-4800

A member of the Worldwide

Eberspächer GmbH Group of Companies