PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
9
4. Visually inspect wiring. Be sure there is no chafing of the insulation. Be sure that the di-
rect spark ignition cable (yellow) wire is secured to the electrode under the burner and that
the connector is not touching anything.
5. Check seat on front lip of electronics drawer to be sure that it still seals when drawer is
shut. Check that all case sealing grommets are secure and not leaking.
6. Check for soot around the flue. Soot is a sign of incomplete combustion and a qualified
service technician should be notified to correct the problem.
7. The pressure relief valve should be manually activated at least once a year by moving the
lever on the top of the valve 90°. Never perform this operation while the burner is operat-
ing. Water will flow freely from the valve and could cause scalding.
Never plug the pressure relief valve. If the valve is actuating too frequently, contact Preci-
sionTemp.
Winter Operation and Winterizing Water Heater
It is not recommended that you operate water systems in the winter. Any freezing of the wa-
ter heater or other plumbing components can cause severe damage that is not covered by
warranty.
However, if it is necessary to operate the RV- 500 under freezing conditions, the power and
gas supply to the unit should not be turned off. As long as the power and gas are on, the unit
will ignite to protect the heat exchanger as the water temperature approaches freezing.
For extended cold temperature use contact PrecisionTemp regarding our optional
freeze protection kit.
Under no circumstances, however, should you travel under freezing conditions without first
draining water from the unit. To drain the system:
1. Turn off water pump and the power and gas to the heater. Open the pressure relief valve
by lifting the handle to a 90° position from the normal position.
2. Open drain valve that was installed at hot water outlet fitting of heater.
3. Open at least one hot and cold water tap in the coach. This should drain the system.
Before storing the system for the winter, the plumbing system must be winterized. This can
be done by either of the following methods:
1. All water should be drained from the system. To do this, open one tap at a time, using
compressed air to purge the system of all water.
2. Recommendations of your coach manufacturer should be followed. Since the RV-500 has
no storage tank, there is no need for a water heater bypass kit. It holds less than one
pint of anti-freeze. The water system can be filled with RV, non-toxic anti-freeze. When
you see the anti-freeze coming from the hot water tap, the heater is protected.
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