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RV500 OPERATING INSTRUCTIONS
The RV‐500 is designed to give a continuous flow of hot water as long as required and
maintain temperature within the capacity of the heater (90°F temperature rise at one GPM).
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
temperatures that could result in severe injury. If it is necessary to change the setting refer to
the Service Manual or call PrecisionTemp.
The heater is dormant until a hot water tap is opened. The heater will not fire at very low
flows; i.e., under 0.5 GPM. During normal operation the RV500 will have a steady flashing
green LED light on the front of the electronics drawer. A red flashing LED indicates a trouble
code; refer to the Service Manual or call PrecisionTemp for assistance. When adjusting water
temperature it is best to start with hot only and slowly add cold into the mix until the desired
temperature is reached.
NOTE: When using an "on/off" button on a shower head or an outside wash down box, always
turn off the hot and cold water valves when finished. Not doing so will result in cold water
bleeding into the hot water system. This will either cause the water heater not to ignite or
result in alternating warm and cold water.
Dry Camping
RV showerheads are designed to drip when turned off and will allow the hot water line to be
filled with cold water. When showering it is recommended that you leave the water running
as you would at home. You will not run out of hot water and you will not waste additional
water waiting for the cold water to purge from the water line every time the water is turned
back on.
Winter Operation
When operating the RV500 in cold climate conditions the flow of water may have to be slightly
restricted or slowed at the faucet to maintain the set temperature of 120 degrees. NOTE: If
your RV500 is equipped with the Cold Weather Protection Package the 12vdc power and
propane must be left on to protect the RV500 from freezing in cold climate conditions. The
Cold weather protection switch, located on the bottom of the electronics drawer, must be
turned on prior to experiencing freezing temperatures to protect against freezing.
Models built prior to 9/2011 do not have a switch.
Winter Driving Instructions: Under no circumstances should you travel in freezing conditions
without first draining water from the unit. Follow the winter driving draining instructions
prior to driving in freezing temperatures. Freezing is not covered under the product warranty.
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Summary of Contents for PrecisionTemp RV500
- Page 1 RV500 OPERATING INSTRUCTIONS The RV‐500 is designed to give a continuous flow of hot water as long as required and maintain temperature within the capacity of the heater (90°F temperature rise at one GPM). 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 temperatures that could result in severe injury. If it is necessary to change the setting refer to the Service Manual or call PrecisionTemp. The heater is dormant until a hot water tap is opened. The heater will not fire at very low flows; i.e., under 0.5 GPM. During normal operation the RV500 will have a steady flashing green LED light on the front of the electronics drawer. A red flashing LED indicates a trouble code; refer to the Service Manual or call PrecisionTemp for assistance. When adjusting water temperature it is best to start with hot only and slowly add cold into the mix until the desired temperature is reached. NOTE: When using an "on/off" button on a shower head or an outside wash down box, always turn off the hot and cold water valves when finished. Not doing so will result in cold water bleeding into the hot water system. This will either cause the water heater not to ignite or result in alternating warm and cold water. Dry Camping RV showerheads are designed to drip when turned off and will allow the hot water line to be filled with cold water. When showering it is recommended that you leave the water running as you would at home. You will not run out of hot water and you will not waste additional water waiting for the cold water to purge from the water line every time the water is turned back on. Winter Operation When operating the RV500 in cold climate conditions the flow of water may have to be slightly restricted or slowed at the faucet to maintain the set temperature of 120 degrees. NOTE: If your RV500 is equipped with the Cold Weather Protection Package the 12vdc power and propane must be left on to protect the RV500 from freezing in cold climate conditions. The Cold weather protection switch, located on the bottom of the electronics drawer, must be turned on prior to experiencing freezing temperatures to protect against freezing. Models built prior to 9/2011 do not have a switch. Winter Driving Instructions: Under no circumstances should you travel in freezing conditions without first draining water from the unit. Follow the winter driving draining instructions prior to driving in freezing temperatures. Freezing is not covered under the product warranty. ...
- Page 2 RV500 Water Heater Winter Driving Draining Instructions 1. Turn off water supply. 2. Open all hot water faucets. 3. Open the shut off valve on the Red sewer bay drain line. 4. Remove the RV500 door and open the Pressure Relief Valve by moving the lever to the open position. 5. The water lines and the RV500 will now drain. 6. Inspect the Flowmeter sight glass to insure all water is drained from the water heater. 7. When all water is drained from the hot water lines and the Rv500 Flowmeter is empty reinstall the water heater door. Leave the Pressure Relief Valve and hot water faucets open while driving. 8. The heater is now safe to drive in freezing temperatures. 9. Once your destination is reached close the RV500 Pressure Relief Valve and close the sewer bay drain valve. Turn on water supply and close all hot water faucets once air is purged from the lines. ...
- Page 3 Always turn off the 12‐volt power supply to the heater while the vehicle is moving and during any fueling operations. 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. Trying to produce hot water while driving or moving may damage the RV500 electrical components and cause a fire. ...
- Page 4 IMPORTANT COLD WEATHER PROTECTION INFORMATION Prior to WARNING: seasonal freezing temperatures occurring turn on the cold weather protection switch. The cold weather protection switch is located on the bottom of the electronics drawer. Do not disconnect the electrical supply or turn off the propane supply when temperatures are near or below freezing. The RV500 freeze protection system will not work if the electrical power source or propane is disconnected. For complete cold weather protection your heater must be equipped with the cold weather protection package (call PrecisionTemp for details). WARNING: Under no circumstances should you travel during freezing conditions without first draining water from the RV500. WINTERIZING Draining 1. Turn off the power and gas supply to the RV500. 2. Turn off main water supply. 3. Open all hot water taps. (bath room, kitchen, laundry, etc.) 4. Drain all water from plumbing lines. 5. Open pressure relief valve to drain remaining water from the RV500 heat exchanger. 6. After completely draining the system it can be winterized like any other RV by purging remaining water out of water lines with compressed air or pumping RV antifreeze solution through the hot and cold water system; no ...
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