I've combed most all treads pertaining to troubleshooting the 'auxiliary heater' and have completed what I perceive all test to get a running espar. But now I need some help to close in on getting it to run consistently. I have a 2006 cargo 140 with 210k.
I have two heaters, one control unit does not respond at all, here I may consider the 'de-pot' procedure outlined in this thread:
https://sprinter-source.com/forum/showthread.php?t=66368
My second heater control unit was in the van and had worked well for one winter, and then last winter inconsistently. So a month ago I took it apart, cleaned, and measured resistance to the glow pin, flame sensor, and the temp sensor (overheat I believe). I picked the best looking components as they all measured similar. Installed the heater and it did not fire. I gave the fuel pump 9v and it ticked away with my application of power, fan spun smooth with the 9v too. I tried it again yesterday and it fired up and ran great for 5-8 minutes before slowing down for a short period of time, and then stopped running. So it does appear to be functioning, but something is not liked after running for a bit, as that is similar to what I experienced in recent times. I ran it off of my switch to run without the engine running; the DPDT switch installed to work with the REST function. Which works great.
Here are my questions I need help with. I measured the resistance but don't quite understand the values on the meter scale. Do these look right or in realm of good function:
Glow Pin = .5 on a 200 ohm scale - this means 100 ohm?
Flame Sensor = 1.04 on 20k ohm scale - this means 20.8k ohm?
OH Temp = 14.97 on a 20k ohm scale - this means 300k ohm?
And now that I think about this I believe I measured that OH Temp wrong; across the plug so I was going blue/blue and red/red, where as you would want to measure across the two, red/blue right? But there are two of each wire, how would you measure that, and would it need coolant in there to measure correctly? I measured these at the plug inside the heater on the bench right before plugging into the control end to make sure wiring was good before assembly.
Would you want higher or lower resistance for the Glow Pin and Flame Sensor?
The fuel tank was right at 1/4 full, but I am thinking if it was low enough it wouldn't have let if fire at all?
Since I am running the heater without engine running, is it possible there would be a voltage cut off to maintain starter battery minimum? I am going to install a switch I have for my auxiliary battery that charges off the alternator, to be able to connect the coach battery with the starter battery to aid in starting. This might help have power for pre-heating without the engine running.
I have attached pictured of my resistance measurements. Does not look like I can post a .mov, but on my Flickr page link below, you can see a 13 second video of if running beautifully. The photos are there too along with other van stuff like black death.. oh the fun! Thanks to everyone keeping the espar threads going and any help in advance. In the mean time I will put some fuel in it and try driving. I wish this thing ran as consistently as my D2 air heater!
Chris
https://www.flickr.com/photos/146749005@N04/albums/72157680328802126
I have two heaters, one control unit does not respond at all, here I may consider the 'de-pot' procedure outlined in this thread:
https://sprinter-source.com/forum/showthread.php?t=66368
My second heater control unit was in the van and had worked well for one winter, and then last winter inconsistently. So a month ago I took it apart, cleaned, and measured resistance to the glow pin, flame sensor, and the temp sensor (overheat I believe). I picked the best looking components as they all measured similar. Installed the heater and it did not fire. I gave the fuel pump 9v and it ticked away with my application of power, fan spun smooth with the 9v too. I tried it again yesterday and it fired up and ran great for 5-8 minutes before slowing down for a short period of time, and then stopped running. So it does appear to be functioning, but something is not liked after running for a bit, as that is similar to what I experienced in recent times. I ran it off of my switch to run without the engine running; the DPDT switch installed to work with the REST function. Which works great.
Here are my questions I need help with. I measured the resistance but don't quite understand the values on the meter scale. Do these look right or in realm of good function:
Glow Pin = .5 on a 200 ohm scale - this means 100 ohm?
Flame Sensor = 1.04 on 20k ohm scale - this means 20.8k ohm?
OH Temp = 14.97 on a 20k ohm scale - this means 300k ohm?
And now that I think about this I believe I measured that OH Temp wrong; across the plug so I was going blue/blue and red/red, where as you would want to measure across the two, red/blue right? But there are two of each wire, how would you measure that, and would it need coolant in there to measure correctly? I measured these at the plug inside the heater on the bench right before plugging into the control end to make sure wiring was good before assembly.
Would you want higher or lower resistance for the Glow Pin and Flame Sensor?
The fuel tank was right at 1/4 full, but I am thinking if it was low enough it wouldn't have let if fire at all?
Since I am running the heater without engine running, is it possible there would be a voltage cut off to maintain starter battery minimum? I am going to install a switch I have for my auxiliary battery that charges off the alternator, to be able to connect the coach battery with the starter battery to aid in starting. This might help have power for pre-heating without the engine running.
I have attached pictured of my resistance measurements. Does not look like I can post a .mov, but on my Flickr page link below, you can see a 13 second video of if running beautifully. The photos are there too along with other van stuff like black death.. oh the fun! Thanks to everyone keeping the espar threads going and any help in advance. In the mean time I will put some fuel in it and try driving. I wish this thing ran as consistently as my D2 air heater!
Chris
https://www.flickr.com/photos/146749005@N04/albums/72157680328802126
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