Quote:
Originally Posted by asheville
Rear engine road side there is a plug for Heaterblock, it was plugged in and I got a 120 volt reading on that breaker when the breaker switch was turned off only? Guess it was back feeding?
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This "block heater" is not at all related to the Aqua-Hot. The 110 VAC block heater is just that, an electric element inside the coolant passage of the engine itself and is fed by a different electrical supply than the Aqua-Hot.
The Aqua-Hot portion of the engine heating system is a switch on the dash usually labeled "ENGINE HEAT", different than the switch labeled "BLOCK HEATER". The "engine heat" switch will enable a circulating pump to circulate hot engine coolant that is inductively heated by the Aqua-Hot boiler tank and circulates this engine coolant through the diesel engine for pre-heating. It is not the same glycol that is used by the Aqua-Hot boiler and circulated throughout the coach for heat at the remote registers.
There is a sequence of operation that you must know and understand in order to determine exactly what is not taking place when it should. There is a very good Sequence of Operation section in the manual that will explain exactly what should be taking place and when.
Upon first reading this I was thinking it was a common Klixon (hi-temp thermistor) that was causing both the electric and the diesel to think they were satisfied. But after your last post about the electric I think there may be some confusion as to where your 110VAC circuit is feeding into your Aqua-Hot. The older systems use a four Klixon system, a low temp and a high temp for each of the two systems, diesel and AC. The newer systems use a three Klixon system a high for each but a common low. I much prefer the old style, but that is just my opinion.
There will be a separate cover that states 110VAC electrical connection and that is where you want to confirm you have power. If not look upstream towards your breaker panel or relay/switch area. The separate switch for AC (electric) in your galley will usually be next to the diesel switch and activate a relay as the load side will be 110VAC and the control side of that switch will be 12VDC.
All that said, I have seen the igniter module act very similar to what you are describing on a diesel "no fire" condition after the fuel pump runs and primes the system and then shuts down. But before investigating that much further you should really determine if you actually do have a 110VAC issue or are merely confusing the 110VAC system with the block heater and chasing the wrong circuit.
I hope that makes sense and I hope I understood you correctly.
Mike.
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