Le Tonkinois Varnish
B & D Murkin
UK main importers for
Le Tonkinois varnish
Flexidisc sander
Eberspacher Diesel Water Heater Models
D3WZ
D4WZ
I suspect the D4WZ does not exist despite components like glowpins being advertised as being suitable.
These may be similar to adverts for the D5LCC which was never manufactured.
There are no Eberspacher manuals or photos for this model.
Eberspacher water heaters with a Z in the version number are OEM heaters.
OEM water heaters are fitted by the vehicle manufacturer into the engine's water system to provide additional heat when required. Generally the vehicle's water pump circulates the water so the Eberspacher cannot be used with the engine switched off.
Problems can be difficult to localise to the Eberspacher due to the interaction from the vehicles electronics and the engines water circuit. In theory fault finding is best suited to a garage mechanic but I have been told many of them including some vehicle main dealers do not know a lot about Eberspachers.
Eberspacher dealers cannot deal with OEM models and I am unable to give specific advice on them.
The heater's ECU is usually modified to the vehicle manufacturer's specifications which allow the heater to be linked into the engine management system and there are more than 1000 different versions, most will not be interchangeable. Mechanically the heater is unlikely to be changed so the Hydronic servicing pages should be the same or similar enough to be able to do a routine service. ECUs, connectors, wiring and how the heaters are controlled may differ.
Hence the manuals should be considered as rough guides only. Some models have no Eberspacher manuals, the vehicles manuals will be the only source of information.
2 OEM Water Heaters
Top:-
Bottom:-
OEM model.
Technical Installation manual 1988 German**
Troubleshooting & repair manual 2000 German**
Parts manual 2011**
No dates are shown on any labels we have photos of.
Automatic settings Start High Low Standby
Heat output 3300 1600 0 watts.
Supply current 25 8 8 0 amps
Water pump, Fuel pump External
Spare parts can be specific to vehicle manufacturer.
Servicing see Hydronic servicing page.
*see http://mikrob.ru/viewtopic.php?t=129078
Wiring connection details unknown.
Fault finding information see Faults pages for basic faults. Otherwise go to vehicle dealer.
* Thanks to the Russian author for publishing this article on repairing a D3WZ. Google translate helps but the results are not brilliant so I hope to copy some of those photos later and add English notes.
1 Impeller
2 Blower motor
3 Heat exchanger
4 Burner
5 Glowpin
6 Flame sensor
7 Temperature sensor
8 Overheating sensor
9 ECU
10 Combustion air inlet
11 Exhaust
12 Fuel pump
13 Fuel filter
14 Controller
15 Loom connector
D5WZ
Hydronic II D5WZ
**Manuals may not apply but are a good starting point.
OEM model.
Technical Installation manual 2010**
Troubleshooting repair manual -
Parts manual 2012**
Label dates usually not shown.
Automatic settings Start High Low Standby
Heat output 4300 2400 0 watts
Fuel consumption 0.53 0.27 0 l/hr
Power consumption 110 37 10 0 watts
Water pump, fuel pump External
Water throughput 800 at 0.1 bar l/hr
Minimum water throughput 250 l/hr
Servicing see Hydronic servicing page.
Spare parts availability unknown.
Wiring connection details unknown.
Fault finding information see Faults pages for basic faults.
Otherwise go to vehicle dealer.
Page 1 covers water heater introduction
Page 2 covers current models
Page 3 covers OEM models
Page 4 older models -
OEM model 2015.
There are no Eberspacher manuals.
Thanks to William Brugman who investigated and got one working.
Red to +12v
Brown to 0v
Yellow and Blue together for startup when connected to +12v
Red/black to pump
Green to pump
Blue/white for diagnostics