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RV550 OPERATING INSTRUCTIONS
The RV‐550 is designed to give a continuous flow of hot water for as long as required and
maintain a constant water temperature. The temperature on your water heater has been
factory set to the hottest setting approximately 120+°F. A temperature adjustment may be
required, based on incoming water temperature, during summer or winter months to
decrease or increase outgoing water temperature. The temperature can be adjusted by
turning the temperature adjustment (summer/winter) clockwise or counter clockwise to
maintain a comfortable water temperature. Be aware the heater is capable of producing
dangerously hot temperatures that could result in severe injury. Refer to the Service Manual
or call PrecisionTemp for assistance if needed.
The heater is dormant until a hot water tap is opened. The hot water tap must be completely
opened to start the heating process then throttled back to produce very hot water. The
heater will not fire at very low flows; i.e., under 0.5 GPM. When adjusting water temperature
by adding cold water 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 plumbing.
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: Your RV550 is equipped with the Cold Weather Protection Package. The 12vdc power
and propane must be left on to protect the RV550 from freezing in cold climate conditions.
Winter Driving Instructions: Under no circumstances should you travel in freezing conditions
without first draining water from the unit. Freezing is not covered under the product
warranty.
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Summary of Contents for PrecisionTemp RV550
- Page 1 The RV‐550 is designed to give a continuous flow of hot water for as long as required and maintain a constant water temperature. The temperature on your water heater has been factory set to the hottest setting approximately 120+°F. A temperature adjustment may be required, based on incoming water temperature, during summer or winter months to decrease or increase outgoing water temperature. The temperature can be adjusted by turning the temperature adjustment (summer/winter) clockwise or counter clockwise to maintain a comfortable water temperature. Be aware the heater is capable of producing dangerously hot temperatures that could result in severe injury. Refer to the Service Manual or call PrecisionTemp for assistance if needed. The heater is dormant until a hot water tap is opened. The hot water tap must be completely opened to start the heating process then throttled back to produce very hot water. The heater will not fire at very low flows; i.e., under 0.5 GPM. When adjusting water temperature by adding cold water 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 plumbing. 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: Your RV550 is equipped with the Cold Weather Protection Package. The 12vdc power and propane must be left on to protect the RV550 from freezing in cold climate conditions. Winter Driving Instructions: Under no circumstances should you travel in freezing conditions without first draining water from the unit. Freezing is not covered under the product warranty. ...
- Page 2 RV550 Water Heater Winter Driving Draining Instructions 1. Turn off water supply. 2. Open all hot water faucets. 3. Open the plumbing low point drain. 4. Remove the RV550 door and open the Pressure Relief Valve by moving the lever to the open position. 5. The water lines and the RV550 will now drain. 6. When all water is drained from the hot water lines leave the Pressure Relief Valve and hot water faucets open while driving. 7. The heater is now safe to drive in freezing temperatures. 8. Once your destination is reached close the RV550 Pressure Relief Valve and close the drain valve. Turn on water supply, once air is purged from the lines close all hot water faucets and turn on power. ...
- 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 RV550 electrical components and cause a fire. ...
- Page 4 IMPORTANT COLD WEATHER PROTECTION INFORMATION WARNING: Do not disconnect the electrical supply or turn off the propane supply when temperatures are near or below freezing. The RV550 freeze protection system will not work if the electrical power source or propane is disconnected. WARNING: Under no circumstances should you travel during freezing conditions without turning power off and draining water from the RV550. WINTERIZING Draining 1. Turn off the power and gas supply to the RV550. 2. Turn off main water supply. 3. Open all hot water taps. (Bathroom, kitchen, laundry, etc.) 4. Drain all water from plumbing lines. 5. Open pressure relief valve to drain remaining water from the RV550. 6. After completely draining the system it can be winterized, for most RV’s, by purging the remaining water out of water lines with compressed air or pumping RV antifreeze solution through the hot and cold water system. The heater holds approximately one pint of water. PrecisionTemp 11 Sunnybrook Dr. Cincinnati, Ohio 45237 513‐641‐4446 ...
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