I actually got the wrong manual with mine and noticed two weeks later when I was trying to register. I contacted Air Excel who mfr's the Suburban 12 Gal DSI water heater I have and they mailed me a manual as well as these instructions. Most likely this is what you have as I have a family member with a Fuzion.
Regarding the operation of your unit:
If the appliance is functioning correctly it is totally up to the owner as to which operational mode they want to use. You can even use the gas and the electric together to get a little faster recovery time if you wish.
Gas Operation: You will have a switch inside your coach somewhere (the coach mfg. installs them so I apologize I have no way of knowing exactly where it might be) that should have a red light beside it if it is our switch. This switch needs to be in the on position if you wish to use your appliance on gas. In normal operation that red light will come on and when it recognizes the flame the red light will go off.
Electric Operation: When you go outside your coach and open up the waterheater door, you will see an on/off switch on the bottom left hand corner of the waterheater. This switch needs to be in the on position if you wish to use your appliance on electric.
When you go outside and open the waterheater door you will notice a black box with two rubber grommets that say “reset” and sometimes they get tripped like the breakers in your house; the one on the right is for the gas and the one on the left is for the electric. Should your waterheater stop functioning you can go outside and try to push the corresponding grommet in (if you feel it move just a bit that should solve your problem) Also underneath these grommets are the thermostats which are preset at around 130 degrees give or take a couple of degrees.
Please remember: Airxcel Suburban Equipment must be installed by a qualified or knowledgeable gas service agency. Please do not attempt to install or repair our gas appliances. Doing so may cause damage or injury and could void the warranty and gas certification.
To find a service agency near you please visit our web-site at
www.rvcomfort.com or check your yellow pages for a local gas service agency.
Again, thank you for choosing Airxcel Suburban Products and please let us know if you need additional assistance.