Ariston 4 manual Instructions for use, Mounting Pipe, Connections, Closed system thermal expansion

Floor	Heater can sit on floor.
Mounting
Pipe	Connect the cold water inlet pipe to the inlet nipple (marked with a blue ring) and the hot
connections	water outlet pipe to the outlet nipple (marked with a red ring).
CAUTION	To reduce the risk of excessive pressures and temperatures in this water heater, install
	the supplied temperature and pressure protective equipment required by local codes
	but not less than a combination temperature and pressure relief valve certified by a
	nationally recognized testing laboratory that maintains periodic inspection of
	production of listed equipment or materials, as meeting the requirements for Relief
	Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI
	Z21.22. This valve must be marked with a maximum set pressure not to exceed the
	marked maximum working pressure of the water heater. Install the valve in the opening
	provided and marked for this purpose in the water heater, and orient it or provide
	tubing so that any discharge from the valve will exit within 6 inches above, or at any
	distance below, the structural floor, and cannot contact any live electrical part. The
	discharge opening must not be blocked or reduced in size under any circumstances.

Closed system thermal expansion

Periodic discharge of the temperature and pressure relief valve or failure of the element gasket may be due to thermal expansion in a closed water supply system. The water utility supply meter may contain a check valve, backflow preventer or water pressure reducing valve which will create a closed water system. During the heating cycle of the water heater, the water expands causing pressure inside the water heater to increase. The temperature and pressure relief valve may discharge hot water under these conditions which results in a loss of energy and a build-up of lime on the relief valve seat.

To prevent this from happening, there are two recommendations:

1.Install a diaphgram-type expansion tank that is suitable for potable water on the cold water supply line. The expansion tank must have a minimum capacity of 1.5 U.S. gallons for every 50 gallons of stored water.

2.Install a 125 PSI pressure relief valve in the cold water supply line. Make sure the discharge of this valve is directed to an open drain and protected from freezing. Contact the local water supplier or plumbing inspector for information on how to control this situation. Do not plug the temperature and pressure relief valve.

Instructions for use

Starting and testing

Before connecting the power, fill the tank and system with water and check for leaks. To be certain that all air is out of the water system, open the hot water faucets on your fixtures until constant water flows from them otherwise damage to the element may occur.

To start the heating cycle:

A)first make sure tank is full. Otherwise the heating element may be damaged.

B)the red light will come on and remain on until that temperature has been reached, at which point the light will go off, but will automatically come back on when the water temperature drops below the setting chosen.

Temperature Setting

After installation check the water temperature. If adjustment is necessary remove front cover to adjust thermostat D (fig. 3/5 - clockwise to increase the temperature and anticlockwise to decrease it).

To reach the thermostat lift the plate V using a thin screw-driver operating on point W (fig. 3/4). Unscrew the screw below and lift the cover C. When reassembling work in the opposite way being careful to insert first the tongue of the cover into the slot.

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