One for the Eberspacher experts

Converging

Converging

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Having looked at the truly exorbitant price of Eberspacher timer thermostat controllers is there any reason why a battery operated domestic unit could not be used:
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4075985

Compact 5+1+1 day programmable room thermostat
Digital display shows time and temperature
Change over contacts for heating or cooling applications
Call for heat indicator
Manual over ride
Easy to install (2 wire) and program
Powered by 2 AAA batteries

I was sat having my tea when I noticed what we use at home!!!
 
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Converging said:
Having looked at the truly exorbitant price of Eberspacher timer thermostat controllers is there any reason why a battery operated domestic unit could not be used:
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4075985

Compact 5+1+1 day programmable room thermostat
Digital display shows time and temperature
Change over contacts for heating or cooling applications
Call for heat indicator
Manual over ride
Easy to install (2 wire) and program
Powered by 2 AAA batteries

I was sat having my tea when I noticed what we use at home!!!
Click to expand...

My Mikuni system uses a 'household' 7 day timer/thermostat, so in theory yes it will be OK, but will depend on whether the Eberspacher one contains more than just a 'clever' switch.
 
A domestic timer/thermostat simply operates as an on/off switch.

An Eberspacher thermostat includes a means of indicating the target temperature and current temperature to the heater. The heater's control system compares the two values and determines the appropriate power setting.

Therefore, I do not think that a domestic thermistat can be used without limiting the range of power outputs that can be used. I have an Eberspacher fitted with a thermostat but no timer. This usually starts up on full power but then reduces to a lower (and quieter) setting when it gets nears to the required temperature. With a normal domestic thermostat it could only be wired to switch between full on an off or half power and off. The first would be unnecessarily noisy. The second might not provide enough power. Also, it would consume more current as it would have to use the glow plug to restart after each off period.
 
Dave_Seager said:
A domestic timer/thermostat simply operates as an on/off switch.

An Eberspacher thermostat includes a means of indicating the target temperature and current temperature to the heater. The heater's control system compares the two values and determines the appropriate power setting.

Therefore, I do not think that a domestic thermistat can be used without limiting the range of power outputs that can be used. I have an Eberspacher fitted with a thermostat but no timer. This usually starts up on full power but then reduces to a lower (and quieter) setting when it gets nears to the required temperature. With a normal domestic thermostat it could only be wired to switch between full on an off or half power and off. The first would be unnecessarily noisy. The second might not provide enough power. Also, it would consume more current as it would have to use the glow plug to restart after each off period.
Click to expand...

I've got a Webasto Hydronic unit and that is NOT how it works (no idea about an Eber but I thought they were similar).

The timer is effectively only an on/off switch. The 'brain' on heater itself a) decides which power level to run at b) controls start up procedure when power is supplied from the timer and c) controls the shut down procedure when power is cuf off from the timer.

I have gone with battery operated LCD timer/stats from here http://www.horstmann.co.uk/central-heating.php I've yet to fit the stuff in the boat but have rigged it all up in the shed and had it running for a weekend.
 
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Forgive me but they are very different.

The Webasto is a far simpler lump with less interlocks and control wires in the harness.

I stripped and rebuilt my webasto when it huffed and puffed and wouldn't light with no probs, got some pictures somewhere of it laid out in bits if you want them, but now I'm on my second ebbersplutter it's more sensitive.

Ian
 
I'm not an expert but the Webasto I had included a strong warning not to turn the power of to it but to switch off via the controller as it goes through a cooldown cycle

A simple thermostat/timer would just cut the power leaving a risk of damage to the unit or is the main power to the unit separate?
 
Elza_Skip said:
I'm not an expert but the Webasto I had included a strong warning not to turn the power of to it but to switch off via the controller as it goes through a cooldown cycle

A simple thermostat/timer would just cut the power leaving a risk of damage to the unit or is the main power to the unit separate?
Click to expand...

Now that is the really interesting bit.

I was cosidering leaving the existing controller on but trying to intercept the shut down wires. These are the wires that people bypass with the one hour thingy. (This excludes early heaters with seperate module).

I beleive to overcome the 1 hour issue they cut into the red feed and put this onto the outer terminal of a three way switch and then take the yellow timer wire to the central and remaining outer terminal. Using the switch one way allows the power to come from the controller timer and the other way bypasses the timer on the controller - OR SO I HAVE BEEN TOLD!!

How does everyone feel about this?
 
Well

How does everyone feel about this?[/QUOTE]

for my pennies worth the ebersplatter controller is cheaper than a new ebersplatter or an "engineer" to reset the lockout when it all goes boosums skywards?

Ian
 
iangrant said:
How does everyone feel about this?
Click to expand...

for my pennies worth the ebersplatter controller is cheaper than a new ebersplatter or an "engineer" to reset the lockout when it all goes boosums skywards?

Ian[/QUOTE]

Totally agree with you Ian but life is all about pushing the boundaries and if it were possible I suspect a lot of people on here would be keen to fit it
 
Elza_Skip said:
I'm not an expert but the Webasto I had included a strong warning not to turn the power of to it but to switch off via the controller as it goes through a cooldown cycle

A simple thermostat/timer would just cut the power leaving a risk of damage to the unit or is the main power to the unit separate?
Click to expand...

On the setup I have, cutting the power from the timer sets off the shut down/cooldown cycle. Cutting the power from the timer does not cut the power to the heater.
 
I would recommend using the existing thermostat as it controls better that way with ramping up and down of the fan and fuel supply depending on temperature. I would then install a timer for the programming features it gives you if you connect this in series in the yellow wire to the eberspacher it will control as it does now but with the timer feature from the programmer. This also works on a webasto as I was told by the dealer in bournemouth (Keto). I have this system fitted on my motohome (with a webasto ) and it is great.
 
I have never found a confirmed answer to this, were someone confirms its been done and it works:

How do you bypass the one hour timer on the controller because that is surely the answer to fitting the thermostat.

It would be good to get a clear answer to this.
 
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