PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
7
• Keep hot water lines as short as possible and no larger than 1/2" ID to conserve water
and accelerate the delivery of hot water.
• Install a water strainer into the water line preceding the water heater to keep particulate
matter out of the system.
• Always have a water pressure reducer in place when using city pressure water.
• It is strongly recommended that an accumulator tank be installed in the cold water line.
This maintains a constant flow of hot water when using the pump, enhances the operation
of your water heater and extends the pump life.
Operating Instructions
The RV-500 is now ready to operate. Follow this procedure to operate the water heater:
1. Pressurize the water system by turning on pump or city water pressure.
2. Purge all air from system by turning on the taps until a steady stream of water flows from
the taps. Turn off taps.
3. Turn on the 12 VDC power supply. A green LED should now be flashing on the front of the
electronics drawer. (Front cover must be opened to observe LED). This indicates normal
operation. Close front cover.
4. Turn on the propane supply at tank and the manual gas valve if installed in system.
Heater will remain dormant until a water tap is opened and the heater senses a water flow
of at least 0.4 GPM.
5. Turn on hot water tap. The heater will fire up within two seconds and hot water will flow
from the tap in the time that it takes to get through the plumbing from the heater to the tap.
Hot water delivery will continue as long as the water is flowing. (Note: You may have to
turn the water on and off several times to bleed the air from the LPG line before the water
heater fires up.) If the heater fails to light after several ignition attempts, turn the power to
the unit off, wait 5 seconds and turn the power on again.
6. Close the hot water tap and the heater will shut off.
NOTE: When using an "on/off" button on a shower head or an outside wash down box, al-
ways turn off the hot and cold water valves when finished. Not doing so will result in cold
water bleeding into the hot water system and causing the water heater not to ignite. Cold wa-
ter or alternating warm and cold water will result.
The RV-500 is designed to give a continuous flow of hot water as long as required and main-
tain the approximate set temperature through all flow rates within the capacity of the heater
(85°F temperature rise per GPM). The heater will not fire at very low flows; i.e., under 0.4
GPM.
It is recommended that even when dry camping, take a real shower and leave the water run-
ning as you would at home. You won't run out of hot water and you won't have to waste
water waiting for the cold water to purge from the water line every time the water is turned
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