PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
8
back on. RV showerheads are designed to drip when turned off and will allow the hot water
line to be filled with cold water.
WARNING: Always turn off the 12-volt power supply to the heater during any fueling opera-
tions. Operating this water heater or any other ignition source during fueling could cause a
fire or explosion, which could result in serious injury or death.
NOTE: Should overheating occur or the gas supply fails to shut off, turn off gas valve at the
supply tank. Immediately call a qualified service technician.
Do not use this appliance if any part has been under water. Immediately contact a qualified
service technician to inspect the appliance and replace any part of the control system and
any gas control, which has been under water.
Changing Temperature Setting
The temperature on your water heater has been factory set to approximately 120°F. It is not
recommended that you change this setting. Doing so could result in dangerously hot tem-
peratures that could result in severe injury. If it is necessary to change the setting it can be
done as follows:
Open access door of heater. Pull the steel electronic drawer out about one inch. The
adjustment screw is located on a small blue block at the lower right corner of the elec-
tronics board (R6), just inside the drawer.
A small blade screwdriver should be used. To decrease temperature, turn screw
counterclockwise. To increase temperature, turn screw clockwise. Check the water
temperature and adjust as necessary.
Use a voltmeter with the black lead in black test point and the red lead in blue test
point adjust the screw in R6 to read 2.0 vdc on the voltmeter. This will set the tem-
perature control at 120º F.
Routine Maintenance
All faucet aerators and showerhead screens should be cleaned regularly.
It is recommended that the RV-500 be inspected by a qualified service technician at least
once a year. Particular attention should be paid to the following:
1. Be sure that the air inlet openings and flue area are clear of any debris or obstructions,
(leaves, bug nests, spider webs, etc.)
2. Check that heater mounting is still secure to the coach and there are no areas for potential
water leaks.
3. Open the cover of the heater and inspect for debris or obstructions under the burner or in
flue hood.
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