Espar Hydronic M10, Hydronic M12, Hydronic M-II User Manual

Hydronic M-II (Water Heater)

Espar Heater Systems

P/N 20 2900 81 0102 08.2010 Subject to Change Web Edition

HYDRONIC M8 Biodiesel

25 2470 05 - 12 Volt 25 2471 05 - 24 Volt

Technical Description Installation Instructions Operating Instructions Maintenance Instructions Troubleshooting and Repair Instructions Parts List

Espar Products, Inc. (800) 387-4800 (905) 670-0960 www.espar.com

HYDRONIC M12

25 2472 05 - 12 Volt 25 2473 05 - 24 Volt

HYDRONIC M10

25 2434 05 - 12 Volt 25 2435 05 - 24 Volt

leas e c h e c k EsparÕs websit

w w w

. e s p a r

. c o m

und er t h e

hnic al D o w nloads section

for th e m o st current and

up-t o- d a t e manuals.

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

Table of Contents Page

Introduction Heater Warnings .............................................. 3

Technical Data Hydronic M8 Biodiesel .............................................. 4

Technical Data Hydronic M10 ............................................. 5

Technical Data Hydronic M12 .............................................. 6

Heater Components .............................................. 7

Principal Dimensions .............................................. 8

Installation Procedures Heater Location / Mounting/ Fastening .............................................. 9

Heater & Engine Plumbing .............................................. 10

Fuel Quality .............................................. 11

Fuel System .............................................. 12

Electrical Connections .............................................. 14

Exhaust / Intake Connections .............................................. 15

Operating Switches: 7 Day Timer .............................................. 16

Push/Pull Switch, Programmable Timer .............................................. 18

Heater Operation Pre-Start Procedures / Start-Up .............................................. 20

Heating Mode / Termperature Drop .............................................. 20

Switching Off /Safety Equipment .............................................. 20

Heater Wiring .............................................. 21

Parts List for Wiring Diagram .............................................. 22

Heater Wiring Diagram .............................................. 23

Controler wireing diagrams .............................................. 24

Maintenance, Periodic Maintenance .............................................. 25

Troubleshooting & Basic Troubleshooting / Self Diagnostics .............................................. 25

Repairs Fault codes / Description / Repair .............................................. 26

Repair Instructions .............................................. 30

Repair Steps .............................................. 31

Fuel Quantity .............................................. 47

Heater Components Parts Diagram .............................................. 48

Description & Part #ʼs .............................................. 49

Parts Diagram - Boxed units .............................................. 50

Description & Part #ʼs .............................................. 51

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.

Introduction

! Correct installation of this heater is necessary to ensure

safe and proper operation. Read and understand this manual before attempting to install the heater. Failure to follow all these instructions could cause serious or fatal injury.

! Heater must be turned off while re-fueling.

! Do not install heater in enclosed areas where combustible

fumes may be present.

! Do not install heaters in engine compartments of marine

vessals.

! "nstall the exhaust system so it will maintain a minimum

distance of 50mm (2Ó) from any flammable or heat sensitive material.

! #nsure that the fuel system is intact and there are no leaks.

! Route the heater exhaust so that exhaust fumes cannot

enter any passenger compartments.

! "$%running exhaust components through an enclosed com-

partment, ensure that it is vented to the outside.

! &he use of #'()*%coolant heaters requires that the coolant

in the system to be heated contains a proper mixture of water and antifreeze to prevent coolant from freezing or slushing.

! "$% the coolant becomes slushy or frozen, the heater+'

coolant pump cannot move the coolant causing a blockage of the circulating system. Once this occurs, pressure will build up rapidly in the heater and the coolant hose will either burst or blow off at the connection point to the heater.

! &his situation could cause engine damage and/or person-

al injury. #,-*./.%care should be taken to ensure a proper mixture of water and antifreeze is used in the coolant system.

! Refer to the engine manufacturer+' or coolant manufactu-

rer+' recommendations for your specific requirements.

Warning To Installer

Warning - Explosion Hazard

Warning - Fire Hazard

Warning - Asphyxiation Hazard

Warning - Safety Hazard on Coolant Heaters Used With Improper Antifreeze Mixtures

Heater Warnings

"0'-)11)-230%of the heater is permitted in vehicles used for the transport of dangerous goods as per ADR.

Caution:

During electrical welding work on the vehicle disconnect the power to the heater in order to protect the

control unit.

Heating at high altitudes

&4.%53/67'-230%6.4)8237*%3$%-4.%4.)-.*%54)09.'%:2-4%205*.)'ing altitude, due to the lower air density. &4.%heater has an automatic altitude detection device which it uses to automatically compensate for the change in air density, i.e. the combustion ratio between fuel and air is adapted to the ambient conditions by reducing the fuel quantity.

!%&4.%usual switching limit for altitude detection lies between

1000 m asl and 2000 m asl and solely depends on the local climatic conditions.

!%&4.%maximum heating output of the Hydronic M10 / M12 in

ÒAltitude ModeÓ is 8.5 kW.

!%&4.%Hydronic M8 Biodiesel does not have an altitude detec-

tion device. Unrestricted heating mode is possible up to 1500 m asl.

!%;.)-.*'%'72-)61.%$3*%4294%)1-2-7<.'%4)8.%=;%>2-?%/)*@.<%30%-4e

side of the nameplate.

&4.% heater must only be used and operated for the range of application stated by the manufacturer in compliance with the ÒOperating instructionsÓ included with every heater.

Direct questions to #'()*%Heater Systems:

U.S.A. & Canada 1-800-387-4800

&42'%(76125)-230%:)'%53**.5-%)-%-4.%-2/.%3$%(*20-A%%;3:.8.*, #'()*% has a policy of continuous improvement and

reserves the right to amend any specifications without prior notice.

Safety instructions for application and proper purpose

Note: All measurements contained in this manual contain

metric and approximate BC# equivalents in brackets eg 25mm (1Ó).

Note: Only one kit from the listed above is needed.

Please note!

Introduction

Technical data

Heater type

HYDRONIC M-II

Heater HYDRONIC M8 Biodiesel

Version D 8 W

diulf gnilooC ,retaWmuidem gnitaeH

LowMediumHighPowerwolf taeh eht fo lortnoC

Heat flow (BTU) (Watt)

Figures for operation with diesel fuel. If operated with Biodiesel the heat flow can reduce by up to 15 %.

27297 17061 11943 5118

8000

BTU Watt 5000 3500 1500

0.050.110.170.24

0.180.400.650.90

g/h l/h

) (l/h)h/g( noitpmusnoc leuF

Electrical power (Watt) in operation 55 46 39 35

002Sec. 52 retfa – trats ta

23Stand by

tloV 42tloV 21egatlov detaR

Operating range

• Lower voltage limit: An undervoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 02tloV 01

• Upper voltage limit: An overvoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 03tloV 51

up to 200 kPa - 30 psierusserp gnitarepo elbareloT

1400 l/h

500 l/h

370 g/h

132 g/h

2 psi ta pmup retaw eht fo etar wolF

retaeh eht fo etar wolf retaw muminiM

gninnur toNnoitarepOerutarepmet gnitarepo elbareloT

Heater / Control box

Diesel

Biodiesel

Dosing pump

Diesel

Weight with controller and water pump, without dosing pump

approx. 6.2 kg - 13.7 lb

– 40 °F to +176 °F / –40 °C to +80 °C –40 °F to +185 °F / –40 °C to +85 °C

+17.6 °F to +176 °F / –8 °C to +80 °C –40 °F to +185 °F / –40 °C to +85 °C

– 40 °F to +122 °F / –40 °C to +50 °C –40 °F to +185 °F / –40 °C to +85 °C

+17.6 °F to +122 °F / –8 °C to +50 °C –40 °F to +185 °F / –40 °C to +85 °C

Caution:

Failure to comply with the technical data can result in malfunctions.

Introduction

Technical data

Heater type

HYDRONIC M-II

Heater HYDRONIC M10

Version D 10 W

diulf gnilooC ,retaWmuidem gnitaeH

wolf taeh eht fo lortnoC

5118119432729732415BTU wolf taeH

0.050.110.240.32

0.180.40.91.2

(g / h ) noitpmusnoc leuF

Electrical power (Watt)

021 52 retfa – trats ta

tloV 42tloV 21egatlov detaR

Operating range

• Lower voltage limit: An undervoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 02tloV 01

• Upper voltage limit: An overvoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 03tloV 51

up to 200 kPa - 30 psierusserp gnitarepo elbareloT

1400 l/ h - 370 g/h2 psi ta pmup retaw eht fo etar wolF

500 l/ h - 132 g/hretaeh eht fo etar wolf retaw muminiM

gninnur toNnoitarepOerutarepmet gnitarepo elbareloT

Heater / Control box

Dosing pump

Weight with controller and water pump, without dosing pump

approx. 6.2 g/ h - 13.7 lb

–40 °F to +176 °F / –40 °C to +80 °C –40 °F to +185 °F / –40 °C to +85 °C

–40 °F to +122 °F / –40 °C to +50 °C –40 °F to +185 °F / –40 °C to +85 °C

in operation 86 60 39 35

LowMediumHighPower

9500Watt 8000 3500 1500

(l / h )

Sec.

Stand by

Caution:

Failure to comply with the technical data can result in malfunctions.

Introduction

Technical data

Heater type

HYDRONIC M-II

Heater HYDRONIC M12

Version D 12 W

diulf gnilooC ,retaWmuidem gnitaeH

Low3 muideM2 muideM1 muideMHighrewoPwolf taeh eht fo lortnoC

wolf taeH

noitpmusnoc leuF

in operation 132 86 46 39 35 34

02152 retfa – trats ta

tloV 42tloV 21egatlov detaR

Operating range

• Lower voltage limit: An undervoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 02tloV 01

• Upper voltage limit: An overvoltage protection in the controller switches the heater off on reaching the voltage limit.

tloV 03tloV 51

erusserp gnitarepo elbareloT

ta pmup retaw eht fo etar wolF

retaeh eht fo etar wolf retaw muminiM

gninnur toNnoitarepOerutarepmet gnitarepo elbareloT

Heater / Control box

Dosing pump

Weight with controller and water pump, without dosing pump

409511943 5118170613241542000

.04.11 .05.17.32.40

0.150.40 0.180.651.21.5

(g / h ) (l / h )

Electrical power (Watt)

2 psi

approx. 6.2 g/ h - 13.7 lb.

Sec.

BTU

up to 200 kPa - 30 psi

1400 l/ h - 370 g/h

500 l/ h - 132 g/h

–40 °F to +176 °F / –40 °C to +80 °C –40 °F to +185 °F / –40 °C to +85 °C

–40 °F to +122 °F / –40 °C to +50 °C –40 °F to +185 °F / –40 °C to +85 °C

Stand by

Caution:

Failure to comply with the technical data can result in malfunctions.

2 WO

9 8 7

Introduction

Heater Components

1 Control box 2 Burner motor 3 Glow plug 4 Flame pipe 5 Overheating sensor 6 Heat exchanger 7 Water pump 8 Combustion chamber 9 Flame sensor

WI = Water inlet WO = Water outlet CA = Combustion air F = Fuel E = Exhaust

Introduction

Principal Dimensions

F WO

CA E

M8 (x4)

* All measurements in millimeters 25.4 mm = 1”

Boxed Heaters Insure: Minimum installation distance (clearance) to open the lid and to dismount the glow pin and the control unit.

Insure: Minimum installation distance (clearance) to take in combustion air.

Permissible installation positions

E Exhaust F Fuel CA Combustion air WO Water outlet WI Water inlet

1 Water outlet socket, heater 2 Water inlet socket, water pump

Installation Procedures

Principal Dimensions - Boxed Version

Always mount the heater in a protected area. Eg: storage compartment, engine compartments, step box or battery box. Espar recommends you use the boxed unit. Refer to fig. 1

When mounting the heater adhere to the following conditions:

• Situate the heater below the normal coolant level of the engine.

• Guard against excessive road spray.

• Keep coolant hoses, fuel lines and electrical wiring as short as possible.

Mount the heater using the four (4) shock mounts provided with kit and one of the following mounting methods:

• Use the Side Mount Bracket to mount the heater on the

side of the frame rail.

• Use a spare step box or battery box.

• Use the saddle bracket and hardware provided

Caution: Guard the heater against excessive road spray to

avoid internal corrosion.

Fix the unit holder from the installation kit to the heater using 4 hexagon screws M8 and 4 spring washers.

Fix the heater and the mounted unit holder in a suitable place in the vehicle using 5 hexagon screws M8, 5 spring washers and 5 hexagon nuts M8

Heater Location

Heater Mounting

Side Mount Bracket

P/N 20 2900 40 00 75

Parts of the structure and other components near the heater must be protected from excess heat exposure and possible contamination from fuel or oil.

The heater must not pose a fire hazard even when it overheats.

– This requirement is deemed to be fulfilled when adequate clearance to all parts is observed during installation, sufficient ventilation is provided and fireproof

materials or heat plates are used.

The heater must not be located in the passenger compartment. A unit may however be used in a hermetically sealed housing

which also corresponds to the conditions stated above.

The factory nameplate or duplicate must be affixed so that it can still be easily read when the heater is installed in the vehicle.

All appropriate precautions must be taken when arranging the heater to minimise the risk of injuries to persons or damage to other property.

Arrangement of the heater

197 mm

(7.76”)

317 mm

(12.4”)

430 mm (16.9”)

Mounting and Fastening

1 Heater 2 Heater bracket

Fig. 1

Box Base

P/N 25 2800 40 10 02

Box Lid

P/N 25 2800 40 10 03

Intake Silencer

always needed P/N 25 1786 80 02 00

Installation Procedures

Heater Plumbing

4 2

The heater is incorporated into the engineʼs cooling system for engine preheating.

Follow these guidelines and refer to the engine plumbing diagram shown below.

• Install hose fittings into the engine block for pick-up and return

lines.

• Use existing holes in the engine block (ie. remove

blanking plugs when possible).

• Use shut off valves to ensure the system can be isolated from

the engine when not in use. Alternatively “T” piece connectors in existing coolant hoses can be used if no blanking plugs are available.

• Provide 20mm (3/4” ) hose barbs for hose connections.

• Use 20mm (3/4” ) hoses to ensure adequate coolant flow.

• Keep the pick up and return points as far apart as possible to

ensure good heat distribution.

• Take the coolant from a low point on the engine to reduce

aeration in the system.

• Ensure proper direction of coolant flow by taking coolant from a

high pressure point in the engine and returning it to a low pressure point. (ie. pickup from back of block and return to the suction side of the engine's water pump).

• Ensure adequate flow rate through the heater by comparing the

incoming and outgoing coolant temperatures while the heater is running. If the rise in temperature exceeds 10°C (18°F), coolant flow must be increased by modifying the plumbing.

• Ensure the heater and water pump are installed as low as pos-

sible to allow the purging of air.

• If a bunk heat exchanger is incorporated into the system,

proper plumbing layouts must be followed.

Water

Water out

Engine Plumbing

Caution: It is possible for the coolant and components of the

coolant circuit to get very hot.

• Parts conveying water must be routed and fastened in such a way that they pose no temperature risk to man, animals or material sensitive to temperature from radiation / direct contact.

• Before working on the coolant circuit, switch the heater off and wait until all components have cooled down completely, if necessary where safety gloves.

Caution:

• When installing the heater, please take note of the direction

of flow of the coolant circuit.

• Fill the heater and water hoses with coolant before con-

necting to the coolant circuit.

• Route the water hoses without any kinks, and in a rising

position if possible.

• When routing the water pipes, observe a sufficient clea-

rance to hot vehicle parts.

• Protect all water hoses / water pipes from chafing and from

extreme temperatures.

• Secure all hose connections with hose clips.

• After the vehicle has been operating for 2 hours or travelled

100 km, tighten the hose clips again.

• The minimum water flow rate is only guaranteed if the tem-

perature difference of the heating medium does not exceed 15°C (60°C) between water inlet and water outlet during heating.

• Only overpressure valves with an opening pressure of min.

6 psi – max. 30 psi bar may be used in the coolant circuit.

• The coolant liquid must contain at least 10 % antifreeze all

year round as corrosion protection.

• The cooling liquid must contain sufficient antifreeze for low

temperatures.

• Before commissioning the heater or after changing the

cooling liquid, the whole coolant circuit including heater must be vented free of bubbles according to the instructions issued by the vehicle manufacturer.

• Only top up with coolant approved by the vehicle manufac-

turer.

1 Heater 2 Non-return valve (Optional) 3 Heat exchanger 4 Vehicle engine

Installation Procedures

• The exhaust outlet must end in the open air.

• The exhaust pipe must not protrude beyond the lateral limits of the vehicle.

• Install the exhaust pipe sloping slightly downwards. If necessary, make a drain hole approx. Ø 5 mm at the lowest point to drain off condensation.

• Important functional parts of the vehicle must not be impaired (keep sufficient clearance).

• Mount the exhaust pipe with sufficient clearance to heat-sensitive parts. Pay particular attention to fuel pipes (plastic or metal), electrical cables and brake hoses etc.!

• Exhaust pipes must be fastened safely (recommended clearance of 50 cm) to avoid damage from vibrations.

• Route the exhaust system so that the emitted fumes are not sucked in with the combustion air.

• The mouth of the exhaust pipe must not get clogged by dirt and snow.

• The mouth of the exhaust pipe must not point in the direction of travel.

• Always fasten silencer to the vehicle.

• The exhaust end pipe should be much shorter than the flexible exhaust pipe from the heater to the exhaust silencer.

Fuel Quality

This means that difficulties are only to be expected for extreme drops in temperature, as also apply to the vehicle engine. Please also refer to the vehicle manual.

If no special diesel fuel is available for low temperatures, then kerosene or gasoline should be mixed with the fuel according to the following table:

Temperature Winterdiesel Addition

0 °C to –25 °C 100 % –

(32 °F to –13 °F) 100 % –

–25 °C to –40 °C 50 %* 50 % paraffin or petrol

(32 °F to –13 °F) 50 %* –

* or 100 % special cold diesel fuel (Arctic diesel).

Caution: The coolant must contain a minimum of 10%

antifreeze at all times as protection against corrosion. Fresh water will corrode internal heater parts.

Note: HYDRONIC M8 Biodiesel

The heater is approved for operation with biodiesel up to a temperature of – 8°C (17.5°F) (the fuel flow reduces at temperatures below 0 °C (35°F)).

• When using 100 % biodiesel, the heater should be run on diesel fuel twice a year (in the middle and at the end of a heating period) to burn off possibly accumulated biodiesel deposits. To do so, let the vehicle tank run almost empty and fill with diesel fuel without adding any biodiesel. While running on this tank filling, switch the heater on 2 to 3 times for 30 minutes at a time at the highest temperature setting.

• If constantly operated with diesel / biodiesel mixtures of up to 50 % biodiesel, intermediate operation with pure diesel fuel is not necessary.

HYDRONIC M10 / HYDRONIC M12

Both heaters are not approved for operation with biodiesel. Up to 10 % biodiesel may be added.

Installation Procedures

Fuel System

FUEL TANK

Fuel System Tolerances

Fuel Line

Note: Butt joints and clamps on all connections.

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

• Use Espar approved fuel lines.

• Other sizes or types of fuel lines may inhibit proper fuel flow.

• Make proper butt joints using clamps and connector pieces as shown

• Use a sharp utility knife to cut plastic fuel lines to avoid burrs.

Note: Fuel line limits must not be exceeded.

Ensure that the following conditions are met.

Bottom of the fuel metering pump must be within a height of 2ʼ6” of the bottom of the fuel pick-up pipe.

Fuel metering pump must be within a total distance of 6ʼ6” from the fuel pick-up pipe.

Pressure runs of less than 1.3 mtrs (50”) use only 3.5mm rubber (360 75 300)

The Hydronic MII boxed unit is most commonly provided with the fuel metering pump mounted inside the box. This is to reduce installation time and to protect the pump from corrosion. If specifications cannot be met the pump must be mounted externally. See illustration for connections and specifications. All parts necessary to do the installation are included in the kit as shown.

1. Fuel Pick-Up Pipe

2. 11mm Clamp

3. 5.0mm Fuel Line

4. Fuel Metering Pump

5. 9mm Clamp

6. 3.5mm Rubber Connector

7. 2.0mm White Plastic Fuel Line See notes if length is less than

1.3 mtr (50”)

Control and Safety Devices

Emergency shutdown – EMERGENCY OFF

If an emergency shutdown – EMERGENCY OFF – is necessary during operation, proceed as follows:

• Switch the heater off with the control

• pull the fuse out

• disconnect the heater from the battery.

Max. 6ʼ6”

Max. 20”

Max. 6ʼ6”

Max. 2ʼ6”

Installation Procedures

Fuel Metering Pump Installation

Note: Drill the two (1/4”) holes first.

( Optional 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 catalogue).

Fuel Pick-Up Pipe

Nut

Sheet Metal Washer

Rubber Gasket

Steel Safety Washer

Holding Tabs

Allow 4” from fuel pick-up to tank bottom. Allow only 1” for flat bottom tanks.

End tip of the fuel pickup pipe should have angle so as to avoid picking up dirt and subsequent blockage

• Choose a protected mounting location close to the 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 0.6cm (1/4”) holes.

• Lift the assembly into position through the 2.5cm (1”) hole.

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

Note: Proper mounting angle of the pump is necessary to

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

If the pump needs to be mounted externally follow these guidelines:

• Choose a protected mounting location close to the fuel pickup pipe and heater.

• Using the bracket and rubber mount provided, install pump as shown.

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

Note: Some pick-up pipes can be installed by either drill or

NPT.

Installation Procedures

Electrical Connections

• 2 core harness (red, brown).

• Connect red wire to fuse link and terminal.

• Attach ring terminal to vehicle battery (+).

• Connect brown wire to vehicle battery (-) using ring terminal provided.

• Insert fuse. (15A-24V, 20A-12V)

• 4 core harness (red, brown, yellow, blue/white)

• Run to location of switch. Make terminal connections at switch. Espar has different available switches.

See switch instructions for more information.

• 2 core harness (green, green).

• Fuel Metering Pump Harness is pre-connected when box is provided with pump pre-mounted.

• If mounted externally, connect wires to fuel metering pump using connector and terminals supplied, with the heater - (no polarity required).

7 D

Timer

7 Day Timer

switch harness

Caution: To avoid potential short circuit damage during instal-

lation, insert main fuse into the power harness after all electrical connections are complete.

A) Power Harness...................................................................

B) Switch Harness..................................................................

C) Fuel Metering Pump Harness...........................................

Shown is a Hydronic MII boxed version, 12 volt with Standard - Power, Switch, Fuel Metering Pump harnesses and optional 7 day timer.

Other timers or switch options are available.

Easy Start Mini Timer

Programable Push and Timer Pull Switch

Note: Wire must be inserted into fuse holder prior to

terminating.

Note: All harnesses should be cut to length.

All exposed electrical connections should be coated with protective grease.

. .

P M

Installation Procedures

Exhaust Connection

The exhaust is hot, keep a minimum of 5cm (2”) clearance from any heat sensitive material. Failure to comply with this warning could result in fire and serious injury.

A 30 mm flexible tube exhaust pipe with a length of 1m long is supplied with the kit for the exhaust. An exhaust clamp is needed to secure the exhaust to the the heater. The exhaust hose cannot be any longer than 1.8 m. Connect the exhaust as follows:

• Connect the exhaust pipe to the exhaust port on the heater and attach with clamp provided. Feed the exhaust pipe through the silicone (white) grommet on the bottom of the box.

• Run exhaust to an open area to the rear or side of the vehicle so that fumes can not build up and enter the passenger compartment or the heater combustion air intake.

• Install exhaust pipe with a slight slope or drill a small hole in the lowest point to allow water to run off. Any restriction in exhaust will cause operational problems.

• Route the exhaust pipe from the heater using holders provided.

Caution: Run exhaust so that it cannot be plugged by dirt, water

or snow. Ensure the outlet does not face into the vehicle slip stream.

Route exhaust beyond the skirt of the cab and outside of the frame area. Route exhaust so that the exhaust fumes cannot enter the passenger compartment. Failure to comply with this warning could result in Asphyxiation.

Combustion air must be drawn in from the outside of vehicle. The combustion air opening must be kept free at all times.

• Connect the air intake pipe to the intake port on the heater and secure with clamp provided.

Caution: Do not install the intake opening facing the vehi-

cle slipstream. Ensure that the opening cannot become clogged with dirt or snow and that any water entering the intake can drain away.

Flexible Exhaust

& Air intake hose

cannot be any

longer than

Max 2m (80”)

Holding clamps

Exhaust & Intake

Clamps

End Sleeve

P/N 25 1786 80 02 00

Air Intake silencer

Always needed

Intake Connection

Warning: Asphyxiation Hazard Warning: Fire Hazard

Note: 1. Exhaust hose cannot be any longer than 2m (80”)

2. Minimum length 0.2 m (8”)

3. Air intake silencer always needed.

ATTENTION: Refer to pg. #3 for High altitude capabilities.

Installation Procedures

Operating Switches

Note: If installing a remote starter, refer to remote starter

instructions before terminating wires.

A 7 Day Timer, a Push/Pull switch, a Programmable Timer or an easy start timer are available for the heater.

The 7 Day Timer has been designed to provide a simple means to control the operation of the heater system and to include the capability for diagnostics. This timer connects to the diagnostic circuit of the heater. The timer then displays any heater fault codes in three digit number form automatically. The timer allows for pre-selection of turn on time, up to 7 days in advance, as well as an option for run times up to 2 hours before automatically turning off. In addition, there is an on/off switch for manual operation. By default the timer is pre-set by Espar to operate for two hours. Refer to instructions provided with timer for setting options.

• Mount bezel into dash and insert timer or use Esparʼs optional mounting bracket and secure to dash.

• Use hardware supplied for connections.

• Connect the switch harness to the connector at the heater and run harness to switch location. (Harness should be neatly routed and secured under dashboard).

• Cut harness to length and terminate wires. Attach using connectors provided.

• Refer to timer instructions for other wiring options.

7 Day Timer Instructions

Option #1: Dash lights to timer - connect wire between dash

lights circuit and timer at terminal #1.

Note: The timer display is automatically illuminated while the

heater is operating. Connecting pin 1 to the vehicle

dim- mer switch will allow the timer display to illuminate with

the vehicles dash lights.

Mounting Bracket & Bezel

P/N 25 1482 70 01 00

Mounting Bracket

Bezel

Setting Time and Weekday

Push button once 12:00 will begin to flash (this will occur upon initial hook up to power). Using or set the present time of day (24 hour clock). When the time stops flashing the time has been stored. The weekday will now begin to flash. Use or to set the present weekday. When the weekday stops flashing the weekday has been stored.

When the vehicle ignition is turned “on” the time display will appear, if optional connection on pin 10 is insatlled. When the vehicle ignition is turned “off” the timer display will go off after 15 seconds.

Changing the Time or Day

Push and hold button until the time display begins to flash. Continue to set the time as listed in setting time and weekday.

Using the Timer with the Vehicle Ignition “Off”

Push button.

will appear on the display as well as the operation countdown timer. The running time is factory set to maximum of 120 minutes. This running time can be reset once or permanently as desired.

Adjusting Preheat Time Once

Press button. The will appear in the display and the preselected run time will appear in the display (maximum time of 120 minutes). Use the or to adjust the desired run time.

Adjusting the Heater Preheat Time Permanently

(Maximum Preheat Time of 120 minutes) Push and hold (about 3 seconds) until the display lights up and flashes. Release button. Use or to set the new fixed preheat time. When the display goes off the new preheat time is set.

Note: At the end of a preheat cycle the timer will turn the

heater off. The heater will complete a cool down

cycle and turn itself off.

. .

Option #1

Option #2

Yellow

Red

Brown Blue

DIAG

TRS

Yellow

Red

Blue

Brown

12 11 10 9 8 7 6 5 4 3 2 1

a4)

Option #2: Operate heater continuously - connect wire from

ignition circuit to terminal #10.

Note: An alternative to connecting pin 10 to the vehicle

ignition accessories “On” circuit may also be considered for some applications where extended run times are desired. Connecting pin 10 with the red wire will enable the heater to run continuously on manual mode.

Operating Instructions

Installation Procedures

Using the Heater Manually with the Vehicle Accesory “On”

(Optional wire on pin 10 is connected to the ignition lock) Push buton. The symbol will appear in the display next to the time of day. The time of day will remain displayed during ignition on operation. The heater will function continually as long as the vehicle ignition is “On”. When the vehicle ignition is turned “Off” the heater will continue to operate for an additional 15 minutes. The run time can be altered by pressing the or buttons. The heater can be turned off by pressing button.

Set Preheat Times into Memory

Press button until the desired memory location is shown in the display (Three memory locations are available). Using the or buttons set the desired preheat start time of day. When the time stops flashing the time of day is set. Using the or buttons set the desired day of the week. When the day of the week stops flashing the day is set.

To Use Preset Start Times

Press the button until the desired memory location appears in the display. The heater will start at the day and time displayed. The display will go off in 15 seconds. The memory location number will stay displayed (1, 2 or 3).

Note: When preset is chosen this symbol will flash red.

To Turn Heater “Off” - All Modes

Press the button once. The heat signal to the heater will be turned “Off”. The heater will do a normal cooldown and turn itself “Off”.

Wiring Connections at Connector

Terminal 1 Power from vehicle dash lights. Terminal 2 Heater switch wire - Yellow wire. Terminal 4 Connect to vehicle ground. Terminal 6 Temperature setting “+” (air only). Terminal 8 Heater diagnostic lead - blue wire. Terminal 9 Temperature setting “-” (air only). Terminal 10 To vehicle “ACC” accessory for

continuous overnight use, and for

unlocking ECU. Terminal 11 Positive power from heater - red “+”. Terminal 12 Ground lead from heater - brown “-”. Terminal 3,5,7 Left blank, not required.

Control Unit Locking

The control unit may becomed locked due to one of the following conditions:

1. Overheat – If the heater overheats three times in succes-

sion, fault message F15 is displayed and the control unit is locked.

2. Too many failed start attempts - If the heater performs

many start attempts in succession (i.e. Fault 52), fault messsage F50 is displayed and the control unit is locked.

Unlocking Control Units and Erasing Fault Memory

1. Turn on the vehicle ignition to activate timer display.

2. Press the key. The current fault code (i.e. F15 or F50) is now displayed.

3. Press the key and hold it down and press the key within two seconds. The timer is now in the retrieval mode.

4. Turn off the ignition.

5. Press the key and hold it down and press the key within two seconds and hold it down.

6. While holding down keys, turn ignition on and wait until the following display appears:

7. Press the key to turn the heater off.

8. Press the key to turn the heater on.

9. Repeat step three. The following display appears:

10.The control unit lock is cancelled after three seconds and the heater starts.

Retreaving the Stored Fault Codes

1. Press the key. The heater is switched on.

2. Press the key and hold it down and press the key within two seconds. The current fault code is now displayed (Example: AF:64).

3. The stored fault codes (maximum of 5) can now be

retrieved

Note: · This timer is equipped to display fault code numbers if

the heater should shut down due to an operating fault. The fault code will show in the timer display next to the flashing heat wave symbol. This applies to all current model heaters when the blue diagnostic wire is connected.

· If the timer is purchased without the harness kit, the

following heaters will need a load relay intalled (D8Lc, D7W, D12W, D24W and D30W), These heaters carry a load on the switch wire. (i.e. fuel metering pump or noid sole valve).

· An outside temperature sensor is available as an option.

Note: The electrical connection for the ignition / accessory

wire to the timer terminal #10 must be in place.

Note: Consult the Troubleshooting and Repair manuals for

code definition and corrective action. If the heater is not being operated using the 7-day timer, fault code retrieval can be obtained using the “Fault Code

Retrieval Device”, part number: 20 2900

70 50 20.

Installation Procedures

Setting the time

- Slide right switch to to set time.

- Press

1….7 button until arrow points to current day

(1=Monday, 2=Tuesday, etc.). Press the “ h ” and“ m ” buttons to set

the hours and minutes. The “PM” indicator shows noon to 11:59 p.m.

- Slide right switch to “RUN”.

Programming of Switching Times

The Auto Time Switch has the capacity for 8 ON/OFF switches. By using the blocks of days available, you can save program capacity. The block days are:

MO, TU, WE, TH, FR, SA, SU – Individual days of the week MO, TU, WE, TH, FR SA, SU MO, TU, WE, TH, FR, SA MO, WE, FR TU, TH, SA MO, TU, WE

Programmable Timer Instructions

- To program ON or OFF time slide the right switch to .

A “ ” appears in the bottom right hand.

corner and a bulb icon is displayed indicating an ON time is ready to be programmed in memory “ ”.

Press “P” button until desired ON or OFF time program is selected. (NOTE: Odd numbers indicate ON times and Even numbers indicate OFF times. When an OFF time is ready to be programmed there is no bulb icon present. Every cycle must have a programmed ON time and a programmed OFF time or the program will not execute.)

- Press 1....7 button until arrows point to selected day(s) you

want this ON cycle to occur.

- Press “ h ” and “ m ” buttons to show switch-on time, noting

the “PM” indicator.

P/N 5670007 (12v) P/N 5670008 (24v)

• Mount switch in a location where it is easily accessible

• Mount using hardware supplied

• Connect the switch harness to the connector at the heater and run the harness to the switch location

• Cut harness to length at the switch and install terminals

• Connect wiring as described below

Brown- 31 Power from battery “-”

Red- K(15) Power from battery “+”

Yellow-15(K) Switch control to the heater

Blue/White Diagnostic from heater (disregard - tape end

and tie off to the side)

Push/Pull Switch

Programmable Timer

P/N 5670433 (12v) P/N 5670434 (24v)

IMPORTANT: This electronic timer has a maximum loading

printed on the rating label and under no circumstances should this be exceeded.

Features:

• Up to 8 ON and OFF switches a day/56 ON and OFF switches per week.

• Option to program individual days or 8 different weekday groups.

• Minimum switching period of one minute

• Summer/Winter time changeover

• Easy to read LCD display

• Manual Override button

• Battery Back-up

Note: As soon as you have connected 12 or 24 volts you

will have to push down the RESET button and set time to activate the timer.

Yellow (Signal to Heater)

a3)

a5)

a4)

5670433 - 12 Volt 5670434 - 24 Volt

Programmable

Timer

Brown (-)

Red (+)

Note: to save time you can set up each on/off cycle;

- A) to be unique for each individual day, or

- B) for Monday to Friday (days 1 to 5), or

- C) for weekends only (days 6 & 7), or

- D) for all days except Sunday (days 1 to 6) , or …

- E) the entire week at one time. This can save a lot of time when programming the “on” and “off” cycles.

Note: Switch light glows when pulled out and is off when

pushed in.

Notes:

Heater Operation

Pre-Start Procedures

The temperature can be lowered by connecting the positive cable (+) to connector S2, terminal C3 of the heater (see circuit diagrams).

With the switching off the heater starts the after-run of 180 sec. During the after-run the first glow plug is switched on after 90 seconds for a period of 45 seconds, then the second glow plug is switched on until the end of the after-run.

The heater is equipped with the following control and safety devices.

• If the heater does not ignite within 74 seconds after the fuel starts to pump, the start is repeated. If the heater still does not ignite after another 65 seconds of fuel being pumped, the heater is automatically shut down. After an unacceptable number of failed start attempts, the control box is locked.*

• If the flame goes off by itself during operation, the heater is restarted. If the heater does not ignite within 74 seconds after the fuel starts to pump again, the heater is automatically shut down. The shutdown on faults can be cancelled by briefly switching off and on again.

• In the case of overheating (e.g. water shortage, poorly ventilated cooling water circuit), the overheating sensor triggers, the fuel feed is interrupted and the heater is automatically shut down. Once the cause of the overheating has been eliminated, the heater can be re-started by switching it off and on again (provided that the heater has cooled down sufficiently, cooling water temperature < 70 °C). After the heater has been shut down due to overheating an unacceptable number of times, the control box is locked.*

* The ECU can be unlocked and the fault can be displayed

with:

• EasyStart.

• Diagnostics Unit.

• EDiTH diagnostics software. For operation and fault list, please refer to the enclosed operating instructions or these troubleshooting and repair instructions.

• If the lower or upper voltage limit is reached, the heater will shut down.

• The heater does not start up if the electric cable to the metering pump is not connected.

• If one of the two glow plugs is defective, the start sequence takes place with one glow plug only .

• The speed of the blower motor is continuously monitored. If the blower motor does not start up, if it is blocked or if the speed differs by > 12.5 % of the desired speed, the heater will automatically shut down after 60 sec.

• The function of the water pump is continuously monitored.

Upon completion of installation prepare the heater as follows:

• Check all fuel, electrical and plumbing connections.

• Refill the engine coolant.

• Bleed air from the coolant system by running the engine and refilling the antifreeze as needed. Resecure heater hose.

• Run engine to further bleed the system

• Top up engine coolant.

Once switched on, the following sequence occurs:

• Control unit does a systems check (flame sensor, temperature, and various other control unit checks).

• Water pump starts circulating coolant fluid.

• Combustion air blower starts.

• Glow pin begins to preheat 20-30 secs.

• After about 20-3 0 seconds the Fuel Metering Pump starts delivering fuel and the combustion air blower ramps up gradually.

• Once ignition takes place the flame sensor alerts the control unit and the control unit shuts off the glow pin (ignition time:

1.5 - 2 minutes).

At the initial start the heater is operated with the “POWER” stage until the water temperature exceeds the “POWER” / “HIGH” changeover threshold.

HYDRONIC M8 / M10

Then, depending on the heat requirement, the heater switches to the “HIGH – MEDIUM – LOW – STAND BY” stages.

If the heating requirement in the “LOW” stage is so small that the cooling water temperature reaches 85 °C, the heater switches from “LOW” to “STAND BY”.

HYDRONC M12

Then, depending on the heat requirement, the heater switches to the “HIGH – MEDIUM 1 / MEDIUM 2 / MEDIUM 3 – LOW – STAND BY” stages.

If the heating requirement in the “LOW” stage is so small that the cooling water temperature reaches 85 °C, the heater switches from “LOW” to “STAND BY”.

This is followed by the after-run with additional after glowing of the glow plugs (like when heater is switched off).

After the cooling water has cooled to approx. 70 °C the HYDRONIC M8 / M10 heater starts in the “MEDIUM” stage, the HYDRONC M12 heater in the “MEDIUM 1” stage.

If the cooling water temperature reaches approx. 55 °C the temperature sensor switches the vehicle fan on.

Temperature drop only becomes active while the vehicle is runing and if the heater is switched on. The control stages are reached earlier and the heaterʻs control action is adjusted to the lower heat requirement.

Start Up

Heating Mode

Temperature Drop

Safety Equipment

The heater must be switched off while any fuel tank on the vehicle is being filled.

The heater must not be operated in garages or enclosed areas.

Warning:

Switching Off

Note: If the heater fails to start the first time it will automa-

tically attempt a second start. If unsuccessful the heater will shut down completely.

Note: On initial start up the heater may require several

start attempts to self prime the fuel system.

Heater Operation

Heater Wiring

12-pin Connection Pin Assignment

Cable harness HYDRON IC M

Rewiring

12-pin connector

Connection

Cable colour HYDR ONIC

HYDRON IC M-II

Metering pump

green

4C A1

Terminal (- )

brown

3C A2

Terminal (+ )

red

2C A3

Plus signal main battery switch

white / red

1C A4

Plus signal Solenoid valve relay

– 4B B1

Diagnosis

blue

3B B4

Plus signal ADR auxiliary drive

violet

2B B3

Third party control Water pump

– 1B

B2 remains unused

Blower relay

red / yellow

4A C1

D+ for ADR operation

violet / green

3A C2

Temperature drop –

2A C3

Heater ON

yellow

1A C4

Connector is shown from the lead entry side.

The heater is to be connected up electrically according to the EMC directives.

Caution:

EMC can be affected if the heater is not connected up correctly.

For this reason, comply with the following instructions:

• Ensure that the insulation of electrical cables is not damaged.

Avoid:

chafing, kinking, jamming or exposure to heat.

• In waterproof connectors, seal any connector chambers not in use with filler plugs to ensure they are dirt-proof and waterproof.

• Electrical connections and ground connections must be free of corrosion and firmly connected.

• Lubricate connections and ground connections outside the heater interior with contact grease.

If replacing the HYDRONIC 10 / M with the HYDRONIC M-II, the cable harness installed in the vehicle is retained and continues to be used, it is necessary to remove the 12-pin connector using the terminal removal tool and to rewire it according to the following table.

Note: Comply with the following when wiring the heater and the

control unit: fuses and controlers.

• Electrical leads, must be positioned in the vehicle so that they can function perfectly under normal operating conditions without impairment (e.g. due to heat exposure, moisture, etc.).

• The following wire gauge are to be used between the battery and heater.

This ensures that the max. allowable voltage drop in the

cables does not exceed 0.5 V for 12 V or 1 V for 24 V

rated voltage.

Cable cross-sections for a cable length (plus cable + minus cable) of:

– up to 5 m (plus cable + minus cable) = 10 AWG

– from 5 m up to 8 m (plus cable + minus cable) = 8 AWG

• If the ( + ) cable is to be connected to the fuse box, the vehicle's cable from the battery to the fuse box must also be included in the calculation for the total cable length and re-dimensioned if necessary.

• Insulate unused cable ends.

Heater Operation

Parts list for wiring diagram, Hydronic M-II - 12 Volt / 24 Volt

PIN-No. Connection

pmup gnisoDosing pumpA1

B1 Solenoid valve, optional

Relay, blowerC1

B3 TRS signal (ADR) C3 Temperature drop B4 Diagnosis C4 Heater ON

Battery ( - )

Battery ( + )A3

1.1 Blower motor

1.2 Glow pin I

1.2.1 Glow pin II (optional 12 kW)

1.5 Overheating sensor

1.12 Flame sensor

1.13 Temperature sensor

2.1 Control unit

2.2 Fuel metering pump

2.5.7 Relay, vehicle blower (fan)

2.5.18 Relay, changeover water circuit (To be fitted by customer if required)

2.7 Main fuse 12 volt = 20A

24 volt = 15A

2.7.1 Fuse, control option 5A

2.7.5 Fuse, vehicle blower (fan) 25A

2.12 Water pump

5.1 Battery

5.10 Vehicle blower (fan)

a) Connection to 7 day timer, programmable timer, easy start or push pull switch b) Water circuit change-over: Relay makes contact at 68°C and

breaks contact at 63 °C water temperature (with temperature drop 58 °C / 45 °C) c) Temperature drop x) Disconnect cable

2) Diagnosis

a3) Switch on signal a4) Power supply plus

5) Power supply minus

Connectors and bush holdings are shown from the cable inlet side.

Connector pin assignment: 12-pin connector (external).

Heater Operation

Hydronic M-II, Wiring Diagram - 12 Volt / 24 Volt

2.5.7

2.7.1

1.2.1 2.12 1.13 1.12

2.5.18

2.2

2.7

1.2

2.1

1.5 1.1

5.1

5.10

2.7.5

1 1 14 10 7 4 12 13 1 2 8 5 6 3 9

B1 B2 B3 S2 S3

Brown / Green

Brown

Green

Brown

Red

White / Red

Blue / White

Red / Yellow

Yellow

Brown / Black

Brown

Pink

Green

Orange

Red

White

White / Red

Blue / White

Blue

Yellow

Black/Violet

Black

Red

Brown

Red / Yellow

Optional

Brown

Blue/White

White/Red

Brown

Red

Yellow

Red

Brown

Red

a1) a

A1A2A3A4B1B4B3B2C1C2C3

Heater Operation

Hydronic M-II, Controler Options

RED

)

YELLOW

BROWN

15 (K)

0 0

K (15)

Yellow (Signal to Heater)

a3)

a5)

a4)

5670433 - 12 Volt 5670434 - 24 Volt

Programmable

Timer

Brown (-)

Red (+)

LCD

White / Red Blue / White

Brown

Grey

B1 S1S1

a1)

Red

Brown / White Grey Grey / Black Blue / White Violet Brown Yellow Red

a2)

a5)

a4)

1 2 3 4 5 6 7 8 9

ption #1

Option #2

Yellow

Red

Brown Blue

DIAG

TRS

Yellow

Red

Blue

Brown

12 11 10 9 8 7 6 5 4 3 2 1

a4)

)

Push / Pull Switch

7 Day Timer

Programmable Timer

Easy Start T

Optional On/Off Switch

Subtitle Right Page

Maintenance, Troubleshooting & Repairs

Periodic Maintenance

• Check coolant hoses, clamps, and make sure all valves are open. Maintain the engine manufacturers recommended coolant level and ensure that the heater is properly bled after service on or involving the coolant system.

• Visual check of all fuel lines for leaks. Check and if necessary replace fuel filter inserts.

• Visual check of electrical lines and connections for corrosion.

• Run your heater at least once a month during the year (for a minimum of 15 minutes).

• 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. Blending used engine oil with diesel fuel is not permitted.

In the event of failure there are several items which should be checked first before any major troubleshooting is done.

Check:

• Fuses.

• Electrical lines and connections

• Interference in Combustion air and Exhaust pipes.

• Fuel in the tank.

• Battery voltage on heater side of harness

• Coolant flow

The heater is equipped with self diagnostic capability. You can retrieve information on the heaters last 5 faults using the Espar 7 day timer, Esparʼs Fault Code Retrieval Device or ISO adapter and computer.

Esparʼs 7 day timer has a fault code retrieval device built into the unit. This function automatically activates if the heater is experiencing problems.

• Fault codes appear on the LCD display screen.

• Codes can then be translated from the charts on the following pages.

• Pg 10 - 17 for more detailed instructions.

Symbols 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.

This sign is displayed when the heater is in operation.

DIAG The word (Diagnostic) will come on when the diagnos-

tic number is requested.

000 Three digit diagnostic fault code number.

• Disconnect the main harness from heater and insert adapter cable harness between them.

• Connect adapter cable to the cable loom of the Fault code retrieval device.

• Start diagnostic unit - switch heater on from switch.

• 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.

• See the fault code chart on following pages for code number descriptions.

Fault code

retrieval device

P/N 20 2900 70 5020

Diagnostic Adapter

P/N 25 2800 70 1004

Troubleshooting

Basic Troubleshooting

Self Diagnostics

Multifunction

Fault Code Retrieval Device

Equipment Face and Controls

Hook Up

Instructions:

Maintenance, Troubleshooting & Repairs

Fault Code Fault Description Causes / Repair

— — — Diagnosis not possible • Adapter cable not connected properly.

• Diagnostic connection damaged.

• Test ECU. Replace if necessary.

000 No faults — —

005 Warning • Check connection and / or lead for continuity, short circuit and

Short circuit in "Burglar Alarm" output damage.

009 ADR / ADR99 shutdown • Switch the heater off and then on again.

010 Overvoltage cutoff Overvoltage applied to control box for at least 6 seconds.

• Disconnect heater / cable harness plug-in connector, start the vehicle engine, measure the voltage. Connector B2, PIN A2 and A3: – If the voltage is >15 volt or >30 volt, check the generator

regulator and / or the battery.

011 Undervoltage cutoff Undervoltage applied to control box for at least 20 seconds

without interruption.

• Disconnect heater / cable harness plug-in connector, start the vehicle engine, measure the voltage. Connector B2, PIN A2 and A3: – If the voltage is <10 volt or <20 volt, then check the fuses,

the supply cables, the negative connections and the positive support point at the battery for voltage drop (corrosion).

012 Overheating Overheating sensor signals temperature greater than 120°C.

• Measure the resistive value of the overheating sensor, connector B1, PIN 2 and 4, for measured values. See page 44. – If overheating sensor ok, check connection leads for conti-

nuity, short circuit and damage. Vent air from system.

014 Possible overheating dettected Difference between measured value in overheating sensor and

(Temperature difference evaluation) temperature sensor is too great.

• Measure the resistive value of the temperature sensor, connector B1, PIN 2 and 4 and connector B1 PIN 1 and 2; for measured values. See page 44. – If temperature sensor ok, check connection leads for

continuity, short circuit and damage.Vent air from system.

015 Too many overheats, Control box locked due to too frequent overheating (fault code

Control box is locked 012 or 014) in succession.

• Unlock the control box by deleting the fault memory, see pages 16 and 25.

017 Overheating, Max. temperature exceeded at the overheating sensor (180°C).

Sensor threshold exceeded • Check overheating sensor —> fault code 012.

• Check control box.

019 Glow plug 1, Glow plug 1 energy input is too low (< 2000 Ws)

Ignition energy too low • Check glow plug for continuity, short circuit and damage

—> Fault code 020.

• Check control box.

Maintenance, Troubleshooting & Repairs

Fault Code Fault Description Causes / Repair

020 Glow plug 1, interruption • Measure cold resistance of the glow plug at approx. 20°C

ambient temperature – connector B1, PIN 7 and 10.

021 Glow plug 1, overload / short circuit If the values are as follows the glow plug is ok, if the values

downstream of (–) differ – replace the glow plug.

022 Glow plug 1, short circuit downstream Measured value:

of (+) • 12 volt – glow plug = 0.42 – 0.6 ohm

• 24 volt – glow plug = 1.2 – 1.9 ohm – If the glow plug is ok, check the lead harness of the glow plug

for continuity, short circuit and damage.

023 Glow plug 2, interruption • Measure cold resistance of the glow plug at approx. 20°C

ambient temperature – connector B1, PIN 11 and 14.

024 Glow plug 2, overload / short circuit If the values are as follows the glow plug is ok, if the values

downstream of ground differ – replace the glow plug.

Measured value:

• 12 volt – glow plug = 0.42 – 0.6 ohm

• 24 volt – glow plug = 1.2 – 1.9 ohm – If the glow plug is ok, check the lead harness of the glow plug

for continuity, short circuit and damage.

025 Diagnostic line fault • Check diagnostics cable for continuity, short circuit and

Heater remains ready for operation damage – connector B2, PIN B4.

– if ok, check control box.

026 Glow plug 2, short circuit downstream see fault code 023 / 024

of (+)

029 Glow plug 2, Ignition energy too low Glow plug 2 energy input is too low (< 2000 W)

• Check glow plug for continuity, short circuit and damage. —> Fault code 023.

• Check control box.

031 Burner motor, interruption • Check the burner motor's connection leads for continuity, short

circuit and damage – connector B1, PIN 3, 6 and 9.

032 Burner motor, overload • Check burner motor for easy movement by manually rotating

the impeller. – if not smooth running, remove the blockage.

033 Burner motor, speed error / blocked – if ok, check control box / blower unit.

034 Burner motor short circuit

downstream of (+) or (–)

037 Water pump not working • Check water pump.

Apply voltage to the water pump – connector B1, PIN 12 and 13 (power input = max. 4 A or 2 A) – If water pump does not rotate, replace water pump. – If water pump is ok –> check control box / blower unit.

041 Water pump, interruption • Check the water pump's connection and lead harness for con-

tinuity, short circuit and damage – connector B1, PIN 12 and 13.

– If ok, check water pump —> fault code 037.

042 Water pump

Overload short circuit Water pump running dry.

043 Water pump • Vent heater (water shortage), check water flow rate.

Overload downstream of +

Maintenance, Troubleshooting & Repairs

Fault Code Fault Description Causes / Repair

047 Metering pump • Check the metering pump's connection and lead harness for

Overload short circuit continuity, short circuit and damage – connector B2, PIN A1.

–

If ok, check the resistance of metering pump – setpoint value

approx. 20 ohm.

048 Metering pump interruption

049 Metering pump

Overload downstream of +Ub

050 Too many attempted starts Control box locked due to repeated switching on in succession

Control box is locked without flame detection (fault code 052).

• Check fuel supply, exhaust and combustion air system.

• Check glow plug –> see fault code 019 to 024 / 026 / 029.

• Check flame sensor –> fault code 064 / 065.

• Unlock the control box by deleting the fault memory.

052 Exceeding of safety time No flame detected within the start phase. Flame sensor value <

80°C, therefore automatic shutdown because safety time exceeded.

• Check fuel supply, exhaust and combustion air system.

• Check glow plug –> see fault code 019 to 024 / 026 / 029.

• Check flame sensor –> fault code 064 / 065.

053 Flame cutout in Heater ignited (flame detected) and signals flame cutout during a

"POWER" control stage power stage.

• Check fuel quantity, blower speed, fuel supply, exhaust and combustion air system.

054 Flame cutout in "HIGH" control stage • Check flame sensor –> fault code 064 / 065.

055 Flame cutout in "Medium" control stage

(D 8 W / D 10 W) "Medium1" control stage (D 12 W)

056 Flame cutout in

"Medium 2" control stage (D 12 W)

057 Flame cutout in

"Medium 3" control stage (D 12 W)

058 Flame cutout in "LOW" control stage

059 Too rapid rise in water temperature • Vent air from system, check water flow rate.

• Check temperature sensor –> fault code 060 / 061

060 Temperature sensor interruption Temperature sensor signals temperature value outside the

measuring range.

061 Temperature sensor short circuit • Measure the resistive value of the temperature sensor,

Connector B1, PIN 1 and 2; for measured values. See page 44. – If temperature sensor ok, check connection leads for continuity, short circuit and damage.

064 Flame sensor interruption Flame sensor signals temperature value outside the measuring

range.

065 Flame sensor short circuit • Measure the resistive value of the flame sensor – connector B1,

PIN 5 and 8; for measured values. See page 45. – If flame sensor ok, check connection leads for continuity, short

circuit and damage.

Maintenance, Troubleshooting & Repairs

Fault Code Fault Description Causes / Repair

071 Overheating sensor interruption Overheating sensor signals temperature value outside the mea-

suring range.

• Check overheating sensor –> fault code 012.

072 Overheating sensor short circuit

074 Overheating detection hardware is • Control box is defective.

defective, operating lock-out Replace control box / blower unit.

090 External reset • Control box reset by external interference voltage.

Check voltage supply, e.g. battery, leads, generator, fuses.

091 Internal reset • Internal control box fault, replace control box / blower unit.

092 ROM error

093 RAM error, at least one RAM cell is

not working

094 EEPROM error, checksum error within

the area of the operating data, diagnostic parameters or calibration values

095 Invalid data record, checksum error

096 Internal temperature sensor is defective

/ ECU too hot

097 Internal device error

098 Main relay is faulty

099 Too many resets, operating lock-out

The permitted repair work on the heater is described in this chapter. The heater must be removed from the vehicle for the repair work to be carried out. The heater is assembled in the reverse order, note and follow any additional instructions.

Always observe the following safety instructions before working on the heater

• Ensure power is disconnected from heater and that coolant is cool before dismantling the heater.

• The heater must not be operated in closed rooms such as garages or workshops. Exception: Exhaust suction available directly at the entry to the exhaust pipe on the heater.

Caution: • The seals of dismantled components must be

renewed.

• During repair work, check all components for damage and if necessary replace.

• Check connector contacts, plug-in connections and cables for corrosion and damage and if necessary repair.

• Only use Espar spare parts if replacements are necessary.

• After working on the coolant circuit the level of the coolant must be checked and if necessary topped up according to the vehicle manufacturer's instructions. The coolant circuit must then be vented.

• Operation or the “after running” of the heater may only be stopped in an emergency (Turn off switch, remove fuse or disconnect battery) by interrupting the battery current (risk of heater over-heating).

Maintenance, Troubleshooting & Repairs

Repair Instructions

Terminal Removal Tools are used to release plug-in contacts in a connector housing.

Terminal Removal Tool 1.6mm 206 00 205

Terminal Removal Tool 2.8mm 206 00 215

1 Impeller cover 2 O-ring 117.07 x 3.53 3 Cover, side 4 Impeller 5 Glow plug 1 6 Glow plug 2 7 Spark plug socket lining 8 Combustion chamber 9 M5 x 16 TAPTITE / DIN 7500 TORX screw 10 Control box / blower unit 11 Flame sensor 12 Cable tie 13 Electric motor cover 14 M5 x 16 TAPTITE / DIN 7500 TORX screw 15 M4 x 12 TAPTITE / DIN 7985 TORX screw 16 Compression spring 17 Overheating sensor 18 Temperature sensor 19 Overheating / temperature sensor cable loom 20 Jacket with heat exchanger 21 M5 x 25 TAPTITE / DIN 7500 TORX screw 22 Grommet 23 Combustion chamber seal 24 Water pump cable loom connector 25 Hose clip 26 Water pump 27 O-ring 19.8 x 2.3 28 14-pin connector

Warning - Risk of injury, burns and poisoning

Heater Components

Note: After completing all the work and installing the heater

in the vehicle, perform a functional check on the heater.

Note: Do not pull out the overheating (17) and temperature

sensor (18) from the holder by pulling on the connection cable, always use pliers to remove them.

Note: The O-ring (2) must always be replaced.

Maintenance, Troubleshooting & Repairs

Remove overheating sensor and temperature sensor

Figure 3 – 5

• Remove the (15) M4 x 12 screws of the compressive springs

(16) and use pliers to pull off the overheating (17) and

temperature sensor (18).

Figure 1 and 2

• Clamp the removed heater in a retaining device (vice).

• Using 2 screwdrivers, always undo 2 snap connections

of the impeller cover at a time, starting at the control

box/blower unit. Keep to the order shown in the figure

(1.– 8.)

• Remove cover.

• Remove O-ring (2).

Preparatory work for all repairs

Repair step 1

Remove water pump connector

Figure 6

• Disconnect the connector (24) at the water pump (26) and pull the cable loom out of the holder.

Remove side cover and dismantle jacket

Figure 7

• Pull out side cover (3) from above.

• Undo the 4 screws (21) M5 x 25 in the jacket (20) and remove

the jacket from the control box / blower unit.

Remove electric motor cover

Figure 8

• Undo the 2 screws (14) M5 x 16 of the electric motor cover (13)

and remove the cover.

Maintenance, Troubleshooting & Repairs

Dismantle control box/blower unit and jacket

Note: The control box / blower unit may not be placed on the

exposed impeller.

Note: The control box / blower unit may not be placed on the

exposed impeller.

Note: When replacing the control box / blower unit, the

Temp / Overheat sensor and water pump lead harnesses can be left in the 14-pin connector (29).

Maintenance, Troubleshooting & Repairs

Repair step 1

Disconnect 14-pin connector at control box and release cables

Figure 9 – 11 / Sketch 1

• Use side cutters to open the cable tie (12).

• Disconnect the 14-pin connector (29).

• Use the terminal removal tool to remove pins in the 14-pin connector (29) for the electric motor, flame sensor (11), glow plug 1(5) and glow plug 2 (6).

• Expose the cables of the two glow plugs from above (cable duct).

Dismantle control box/blower unit and jacket

A Long wire (brown, white) Figure 11 B Short wire (brown, white)

A AMP release tool

Figure 10

29 14-pin connector

11 Flame sensor Figure 9 12 Cable tie 12 14-pin connector

Sketch 1

Temperature sensor, Yellow

Sensor ground, Blue / White

Overheating sensor, Red

Motor, Phase 1, Pink

Motor, Phase 2, Green

Motor, Pha se 3, Orange

Flame sensor +, Bl ue

Flame sensor, Brown

Glow pl ug 1, lon g cable , Brown

Glow pl ug 1 +, long ca ble , White

Glow plug 2 +, shor t cable , White

Glow plug 2, shor t cable , Brown

Water pump, Black / Red

Water pump, Brown / Black

Maintenance, Troubleshooting & Repairs

Note: Remove combustion chamber seal (23) without leaving

residues. Always check the glow plugs during this repair step, see repair step 3.

Repair step 1

Remove flame sensor

Figure 12

• Unscrew the flame sensor (11) from the housing of the control box / blower unit.

Dismantle combustion chamber

Figure 13 and 14

• Undo the 3 screws (9) M5 x 16 of the combustion chamber (8).

• Lift the combustion chamber (8) with the fuel pipe until the

grommet (22) is exposed, then remove the combustion cham-

ber.

• Remove combustion chamber seal (23).

Control box / blower unit and jacket

Note: Take care when installing the new combustion cham-

ber seal (23) as there is a risk of breaking it.

Note: Ensure the grommet is installed in the correct position,

see Figure 17.

Repair step 2

Install combustion chamber seal

Figure 15 and 16

• Carefully guide the combustion chamber seal (23) over the

cables of the glow plugs and over the fuel pipes and position

on the combustion chamber (8).

Install grommet

Figure 16 and 17

• Carefully position the grommet (22) on the combustion

chamber seal (23).

Insert combustion chamber

Figure 18

• First insert the combustion chamber (8) with the grommet

(22) into the control box / blower unit (10). If the grommet (22)

has been completely inserted, align the combustion chamber

and combustion chamber seal with the control box / blower unit

(10).

Assemble the control box/blower unit and jack-

Maintenance, Troubleshooting & Repairs

Note: It is imperative to keep to the correct laying order for

the sensor lead harness (19) and the glow plug leads. The glow plug leads may not be laid underneath the sensor lead harness (19). The sensor lead harness (19) must be laid in the area of the fuel pipe as shown in Figure 20. The side cover (3) is conical at the bottom to simplify installation.

Maintenance, Troubleshooting & Repairs

Repair step 2

Install combustion chamber

Figure 19

• Use 3 screws (9) M5 x 16 to fix the combustion chamber (8).

Tightening torque M5 x 16 screw.

Lay sensor lead harness and leads of the glow plugs

Figure 20 and 21

• First lay the sensor lead harness (19) in the side cable duct,

then lay the 4 leads of glow plugs 1 (5) and 2 (6) in the cable

duct.

Lay the sensor lead harness (19) and the glow plug leads to

the 14-pin connector (29 - shown in page 33).

• Position the side cover (3) on the middle of the control box /

blower unit (10) and push into the cable duct guide.

Assemble the control box/blower unit and jacket

Maintenance, Troubleshooting & Repairs

Repair step 2

Install flame sensor

Figure 22

• Screw the flame sensor (11) into the housing of the control

box / blower unit.

Flame sensor tightening torque.

Connect flame sensor lead harness and electric motor

leads

Figure 23 / Sketch 2

• Latch the flame sensor lead harness (11) and the three leads

of the electric motor into position in the 14-pin connector (29)

Assemble the control box/blower unit and jacket

Sketch 2

Temperature sensor, Yellow

Sensor ground, Blue / White

Overheating sensor, Red

Motor, Phase 1, Pink

Motor, Phase 2, Green

Motor, Pha se 3, Orange

Flame sensor +, Bl ue

Flame sensor, Brown

Glow pl ug 1, lon g cable , Brown

Glow pl ug 1 +, long ca ble , White

Glow plug 2 +, short cable , White

Water pump Brown , Black

Glow plug 2, short cable , Brown

Water pump, Black / Red

Note: • The leads may not lay against the housing.

• Always lay the Brown / White (long) leads of glow plug 1 (5) last and latch into position in the 14-pin connector (29).

Maintenance, Troubleshooting & Repairs

Repair step 2

Connect the glow plug leads

Figure 24, 25 and Sketch 3

• First, latch the leads of glow plug 2 (6 / short leads) into

position in the 14-pin connector (29).

Then wind the leads of glow plug 1 (5) 2 x around the leads

already latched into position in the 14-pin connector and then

latch into position in the 14-pin connector (29).

Use a cable tie (12) to bundle all leads above the winding.

Connect the 14-pin connector (29) to the control box / blower

unit.

Assemble control box/blower unit and jacket

Temperature sensor, Yellow

Sensor ground, Blue / White

Overheating sensor, Red

Motor, Phase 1, Pink

Motor, Phase 2, Green

Motor, Phase 3, Orange

Water pump, Brown / Black

Flame sensor +, Blue

Flame sensor, Brown

Glow pl ug 1, lon g cable , Brown

Glow pl ug 1 +, long ca ble , White

Glow plug 2 +, shor t cable , White

Glow plug 2, shor t cable , Brown

Water pump, Black / Red

Sketch 3

Note: • The leads may not lay against the housing.

• Check the glow plugs before completely assembling the heater. For check values, see fault code 020 / 021.

Maintenance, Troubleshooting & Repairs

Repair step 2

Install electric motor cover

Figure 26 and 27

• Position the electric motor cover (13) on the housing of the

control box / blower unit, at the same time, insert the water

pump lead harness in the groove provided in the cover.

• Use 2 screws (14) M5 x 16 to fasten the electric motor

cover (13) onto the housing of the control box / blower unit.

Assemble control box / blower unit and jacket

Figure 28

Position the heat exchanger on the control box / blower unit and

fasten with 4 screws (21) M5 x 25.

Assemble control box/blower unit and jacket

Note: Tighten the 4 screws (21) M5 x 25 cross-wise (i.e.

tighten diagonally opposite screws).

Maintenance, Troubleshooting & Repairs

Repair step 2

Lay water pump lead harness

Figure 29

• Insert the water pump lead harness into the holder on the jacket, lay up to the water pump and connect.

Install overheating and temperature sensor

Figure 30 and 31

• Insert the overheating (17) and temperature sensor (18)

into the holders on the jacket.

Insert the sensor cable loom (19) into the holders on the

jacket.

Use 2 screws (15) M4 x 12 to fasten both springs (16) on the

overheating (17) and temperature sensor (18). (See page

31)

Control box/blower unit and jacket

Note: Insert the temperature sensor as shown in the figure

to avoid pinching the cable loom.

Maintenance, Troubleshooting & Repairs

Repair step 2

Install impeller cover

Figure 32

• Clamp the removed heater in a retaining device (vice) and

position the new O-ring (2) on the control box / blower unit.

• Install the impeller cover; ensure that none of the leads of the sensor lead harness (19) get jammed. (See page 40)

Control box/blower unit and jacket

Maintenance, Troubleshooting & Repairs

Repair step 3

Remove / check glow pin

Figure 33

• Carry out repair step 1.

• Unscrew glow pins 1 (5) and 2 (6) from the combustion cham ber housing (8) (See page 36), if necessary check the glow plugs; for check values see fault code 020 / 021.

• Visually check the glow pin socket lining, if necessary renew the glow pin lining.

Install glow pin

Figure 33

• Screw glow pin 1 (5) with long connection leads into the lefthand spark plug socket (2 fuel lines).

• Screw glow pin 2 (6) with short connection leads into the righthand spark plug socket (1 fuel line).

• Assemble the heater according to repair step 2.

Characteristics of the glow pins

Glow pin 1 (5) long leads

– brown lead in Chamber 7

– white lead in Chamber 10

Glow pin 2 (6) short leads

– brown lead in Chamber 14

– white lead in Chamber 11

12 volt glow pin

– green band around the brown and white leads

24 volt glow pin

– yellow band around the brown and white leads

Clean ignition air drillholes

Figure 34

• Use a pointed object to clean the ignition air drillholes in the

left-hand and right-hand spark plug sockets.

Control box/blower unit and jacket

Maintenance, Troubleshooting & Repairs

Repair step 4

Remove glow pin socket lining

Figure 35

• Carry out repair step 1.

• Unscrew glow pin from the combustion chamber housing

(8).

• Use a pointed object to pull the glow pin socket lining out

of the glow pin socket.

Install glow pin socket lining

Figure 36, 36/1

• Insert the glow pin socket linings, with the bevelled edge

facing upwards, into the spark plug sockets up to the limit

stop.

Note: Ensure the ignition air drillhole in the glow pin socket is

not concealed by the spark plug socket lining.

• Assemble the heater according to repair step 2.

Maintenance, Troubleshooting & Repairs

Repair step 5

Figure 37 / Diagram 1

• Removal of the overheating (17) and temperature sensor (18) is described in repair step 1.

• Use the digital multimeter to check the overheating (17) and temperature sensor (18).

If the resistance value lies outside the table of values or the diagram, then replace the overheating (17) and temperature sensor (18).

• Installation of the overheating (17) and temperature sensor

(18) is described in repair step 2.

Check overheating and temperature sensor

Resistance R

NTC

(kΩ)

Temperature (°C)

Temp[°F]

Table of values

Temp[°C] 0 25 40 60 80 100 120

NTC

[kΩ] 32.55 10 5.33 2.49 1.26 0.677 0.389

32 77 104 140 176 212 248

Maintenance, Troubleshooting & Repairs

Repair step 6

Figure 38 / Diagram 2

• Removal of the flame sensor (11) is described in repair step 1.

• Use the digital multimeter to check the flame sensor (11). If the resistance value lies outside the table of values or the diagram, then replace the flame sensor (11).

• Installation of the flame sensor (11) is described in repair step

Check flame sensor

Temperature (°C)

Resistance (

Ω)

Temp[°F]

Table of values

Temp[°C] -50 0 50 100 150 200 250 300 350 400

R [Ω] 803 1000 1194 1385 1573 1758 1941 2120 2297 2470

Diagram 2

-58 32 122 212 302 392 482 572 662 752

Maintenance, Troubleshooting & Repairs

Repair step 7

Figure 39

• Disconnect the connector (24) at the water pump (26).

• Undo the hose clip (25)

• Remove the water pump.

• Check O-ring (See page 50 parts diagram #13), replace if necessary

• Install in the reverse order.

Remove / attach water pump

Note: When assembling the O-ring coat it with lubricant.

Maintenance, Troubleshooting & Repairs

Measuring the fuel quantity

leuf fo ytitnauQretaeH

Desired Maximum Minimum

HYDRONIC M8 Diesel / FAME

5.7 ml/ 68 sec

6.27 ml/ 68 sec

5.13 ml/ 68 sec

HYDRONIC M10 Diesel

7.5 ml/ 68 sec

8.25 ml/ 68 sec

6.75 ml/ 68 sec

HYDRONIC M12 Diesel

7.5 ml/ 68 sec

8.25 ml/ 68 sec

6.75 ml/ 68 sec

Preparing for the measurement

(Sketch 4)

• Disconnect the fuel pressure line at the heater and place the

end in a measuring cylinder (size 25 ml).

• Switch on the heater, if the fuel discharges uniformly and

free of bubbles, the fuel pipe is filled and vented.

• Switch off heater and empty measuring cylinder.

Measurement

• Switch on heater and wait until the metering pump starts pumping the fuel.

• During the measurement, hold the measuring cylinder at the level of the heater.

After 68 sec. the pumping of the fuel is automatically switched off.

• Switch off heater, as otherwise it will start up again.

• Read off the quantity of fuel in the measuring cylinder.

Note: Only carry out the fuel measurement if the battery is

sufficiently charged. During the measurement the voltage applied to the control box should be at least 11 volt or 23 volt and max. 13 volt or 25 volt.

Evaluation

Compare the measured quantity of fuel with the values in the following table.

If the measured quantity of fuel is above the maximum value or below the minimum value, the metering pump must be replaced.

Sketch 4

Heater Components

Hydronic M-II Parts Diagram

Model #

25 2434 05 12V

25 2471 05 24V

Ref. No. Description Part Number

Hydronic M-II - 12 & 24 volt - Diesel & Gasoline versions

1 Combustion air blower/ECU 12 V 25 2470 99 15 00 •

24 V 25 2471 99 15 00 •

12 V 25 2434 99 15 00 •

24 V 25 2435 99 15 00 •

12 V 25 2472 99 15 00 •

24 V 25 2473 99 15 00 •

2 Burner assembly 25 2435 99 11 00 • • • • • •

3 Casing 25 2435 99 01 02 • • • • • •

4 Water pump 12 V 25 2434 99 25 01 • • •

24 V 25 2435 99 25 01 • • •

5 Flame sensor 25 1920 36 00 00 • • • • • •

6 Glow pin 12 V 25 2434 01 01 00 • • •

24 V 25 2435 01 01 00 • • •

7 Water pump harness 25 2435 25 02 00 • • • • • •

8 Temperature overheat sensor 25 2435 40 01 00 • • • • • •

9 Bottom cover blower housing 25 2435 01 00 02 • • • • • •

10 Cover 25 2435 99 01 03 • • • • • •

11 Cover blower housing channel 25 2435 01 00 04 • • • • • •

12 Seal for combustion chamber 25 2435 01 00 10 • • • • • •

13 Water pump O-Ring 19,8 x 2,3 22 1000 70 00 17 • • • • • •

14 Blower O-Ring 117,07 x 3,53 22 1000 70 00 15 • • • • • •

15 Fuel pipe grommet 25 2435 01 01 04 • • • • • •

16 Fuel pipe sleeve 20 1752 01 00 02 • • • • • •

17 Spring clip 25 2281 01 00 09 • • • • • •

18 Screen for glow pin 25 2069 10 01 02 • • • • • •

19 Hose clip 33 – 57 5550001 • • • • • •

20 Taptite screw M 5 x 25 109 10 152 • • • • • •

21 Taptite screw M 5 x 16 109 10 151 • • • • • •

22 Taptite screw M 4 x 12 5590010 • • • • • •

23 Cable tie 5590147 • • • • • •

Description & Part #ʼs

25 2435 05 24V

25 2473 05 24V

25 2472 05 12V

25 2470 05 12V

Heater Components

Subtitle Left Page

Heater Components

Hydronic M Parts Diagram

Model #

25 2434 05 12V

25 2471 05 24V

Ref. No. Description Part Number

Hydronic M-II - 12 & 24 volt - Diesel & Gasoline versions

1 Fuel metering pump 12 V 22 4617 01 00 00 • • •

24 V 22 4618 01 00 00 • • •

2a Cable harness - (JE Harness) ADR 25 2435 80 07 00 • • • • • •

2b Cable harness - Universal 25 2800 70 10 12 • • • • • •

2c Boxed Adapter harness 25 2800 70 10 03 • • • • • •

2d Main box harness 25 2800 70 00 02 • • • • • •

2e Diagnostic adapter 25 2800 70 10 04 • • • • • •

3 Relay harness 22 1000 33 04 00 • • • • • •

4 Cable harness 22 1000 33 08 00 • • • • • •

5 Exhaust muffler 25 1806 80 01 00 • • • • • •

6 Intake silencer 25 1786 80 02 00 • • • • • •

7 Flex exhaust w/cap 25 1816 80 08 00 • • • • • •

8 20mm 90° bend coolant hose 20 1673 80 00 01 • • • • • •

9 20mm 180° bend coolant hose 20 1673 80 00 03 • • • • • •

10 Heater bracket 25 1816 80 00 01 • • • • • •

11 Cable tie 12” 5590147 • • • • • •

12 1.5 mm Plastic fuel line 890 31 118 • • • • • •

13 5mm Fuel hose (biodiesel compatible) 360 75 401 • • • • • •

14 Fuel hose 5x3mm 360 75 350 • • • • • •

15 Fuel line adaptor 3.5 - 5mm 25 1888 80 01 02 • •

16 Fuel hose 3,5 x 3 360 75 300 • • • • • •

17 9mm clamp 10 2068 00 90 98 • • • • • •

18 11mm clamp 10 2068 01 10 98 • • • • • •

19 Holder metering pump 22 1000 50 07 00 • • • • • •

20 FMP angle bracket 20 1348 03 00 04 • • • • • •

21 Metal rubber buffer 20 1185 00 00 01 • • • • • •

22 Connection piece 20 1534 88 00 01 • • • • • •

23 Clamp 20 - 32mm 10 2066 02 00 32 • • • • • •

24 Flex exhaust clamp 152 09 003 • • • • • •

25 Clamp “C” type 152 09 002 • • • • • •

26 Hose connection piece

20 1623 45 00 02 ?????? • • • • • •

27 Integrated fuel filter 20 1312 00 00 06 • • • • • •

28 Socket housing 22 1000 31 93 00 • • • • •

29 Grommet 20 1280 09 01 03 • • • • • •

30 Fuse holder, receptacle housing kit 22 1000 31 06 00 • • • • • •

Description & Part #ʼs

25 2435 05 24V

25 2473 05 24V

25 2472 05 12V

Heater Components

25 2470 05 12V

Model #

Ref. No. Description Part Number

Hydronic M-II - 12 & 24 volt - Diesel & Gasoline versions

31 Fuse 25 A 204 00 089 • • • • • •

15 A 204 00 003 • • • • • •

5 A 204 00 079 • • • • • •

32 Relay 12 V 203 00 065 • • •

24 V 203 00 066 • • •

33 Convoluted tubing 1” X 17” 20 2900 70 90 16 • • • • • •

1/2” 20 2900 70 90 08 • • • • • • 3/8” 20 2900 70 90 13 • • • • • •

1” 20 2900 70 90 14 • • • • • •

34 4mm Plastic fuel line (Biodiesel) 890 31 101 • •

35 Ring Terminal 5/16” 5670196 • • • • • •

Description & Part #ʼs

Heater Components

25 2434 05 12V

25 2471 05 24V

25 2435 05 24V

25 2473 05 24V

25 2472 05 12V

25 2470 05 12V

A member of the Worldwide Eberspcher Group of Companies

Web Edition - August 2010 Subject to change P/N: 20 2900 81 01 02

Espar Products, Inc.

(800) 387-4800

(905) 670-0960

www.espar.com

Espar Hydronic M10, Hydronic M12, Hydronic M-II User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual