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Old 04-15-2019, 10:21 PM   #1
OldWest
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Default Part: Espar Airtronic D4S Superseded by M2 D4R

For our coach air heater, we have an unusual Westfalia specific Espar D4S and not a regular Espar D4.

From Wasaabi and others, we know we have a Westfalia specific circuit board in the heater which can communicate with the windshield central computer console. From OneManVan, we know that not all Espar controllers are compatible with our heater.

The "S" version of the D4 allows for longer and narrower ductwork.

Released in 2019, Espar has replaced the D4S and D4 Plus models with a new M2 D4R (recreational model) (the standard D4 model has also been superseded by M2 D4L???).

https://www.heatso.com/espar-eberspa...kw-heater-kit/

The nomenclature is a bit unclear with a "M2" label in the model name which would seem to suggest a marine application.

From the description of the new heater, the service life is now 5,000 hours versus the previous 3,000 hours. Noise level is also reduced. High altitude adjustment is automatic.

Note: There may be some good sales on the superseded D4S model. One might use our original Westfalia circuit board in a replacement D4S if the circuit board is good.

There is also a replacement for the smaller D2 Airtonic model, the S2 D2L model. Don't know of any Westy owners who have replaced their original heater with a smaller heater.

https://sprinter-source.com/forum/sh...ad.php?t=75153

Last edited by OldWest; 04-15-2019 at 10:47 PM. Reason: Add clarifications.
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Old 04-16-2019, 01:54 PM   #2
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Default Re: Part: Espar Airtronic D4S Superseded by M2 D4R

Good news to see Espar improving their line, and good for Westy owners looking for a replacement and upgrade (especially now with built-in altitude kit). Checking out the site I see they also have a new line of “EasyStart” controllers/timers. Search for “easystart” to see various models. The simple thermostat and timer seem backwards compatible (although not with the D4S and Westfalia-specific ECU, which can be replaced). An interesting option is the radio remote which allows control of the heater from 1000 meters away.
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Old 04-16-2019, 01:59 PM   #3
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Default Re: Part: Espar Airtronic D4S Superseded by M2 D4R

Actually the simple EasyStart control and timer, I suspect, is backwards compatible with the D4S even using the proprietary Westfalia ECU so long as you don’t expect the diagnostic function to work. Not sure of this, but it’s likely due to the fact that our Westy D4S’s can also be controlled by a regular electronic thermostat (as discovered by PNWsquid). Good to have backup options in case of trouble with the Westy main controller by the windshield.
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Old 04-16-2019, 07:11 PM   #4
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Default Re: Part: Espar Airtronic D4S Superseded by M2 D4R

Quote:
Originally Posted by Wasaabi View Post
Actually the simple EasyStart control and timer, I suspect, is backwards compatible with the D4S even using the proprietary Westfalia ECU so long as you donít expect the diagnostic function to work. Not sure of this, but itís likely due to the fact that our Westy D4Sís can also be controlled by a regular electronic thermostat (as discovered by PNWsquid). Good to have backup options in case of trouble with the Westy main controller by the windshield.
I doubt any Espar controller is - or ever will be - compatible with our Westfalia specific D4S ECU. It's a custom ECU designed to only work with our Westfalia Central Electronic Control panel.

For example: I purchased a Digi-Max D1000 and connected it to my OEM Westfalia D4S. It did turn the heater on - but it never turned it off - regardless of how low I set the desired temperature!

Espar basically uses three wires to control the heater. The Yellow wire is call for heat. When 12vdc is applied to this wire a relay inside the heater is energized which powers up the ECU. The other two wires are basically desired & actual temperature. I compared the voltages on these wires. The Espar Digi-Max controller and Westfalia Central Electronic controller output very different voltages. Their method of control is different - IE: incompatible!

Any basic thermostat can be used to control any Espar heater. Simply apply 12vdc to the Yellow wire ( call for heat ). The other two wires going to the heater - IE: desired and actual temperature are left disconnected.

However - beware the heater will run at a fixed power output level. IE: it won't adjust the blower motor speed or dosing pump pulse frequency. Some consider this an advantage as it helps eliminate the problem of soot build up when running at the lowest power level.
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Old 04-17-2019, 12:59 AM   #5
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Default Re: Part: Espar Airtronic D4S Superseded by M2 D4R

Thank you for correcting that, it’s been some time since I had to dig into the Espar. I do have a replacement non-Westy ECU in my D4S along with the D-1000. This controller does very wide temp swings which is a bit uncomfortable but is supposedly to reduce build up. Regardless, I like to blast the heater for a minute or two before shutting off in hopes of burning off whatever has accumulated.

As a side note, my D-1000 recently displayed the “maintenance required” reminder. The default for the reminder, which I never changed, is at 1000 hours. The strange thing is I doubt I’ve used it anywhere near 1000 hours. I’m not sure if this “clock” is stored in the ECU or the D-1000, but I’m going to check if there is a way to get current runtime so I can track it for a while and check if it’s correct. If anyone knows off-hand let me know.
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Old 05-24-2019, 06:14 PM   #6
OldWest
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Default Re: Part: Espar Airtronic D4S Superseded by M2 D4R

Manuals, including info for the M2 D4R which replaces the D4S.

https://www.butlertechnik.com/techni...airtronic-d118
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