Water Connections; Hot Water Delivery; Temperature & Pressure Relief Valve - Rheem 3805 Series Owner's Manual And Installation Instructions

Water Connections

This water heater has either a dip tube or fitting liner in the inlet and outlet fittings. These must be in
place for the water heater to function properly. Do not remove or damage them by using heat
nearby. They will be pushed into the correct position as the fitting is screwed in.
An isolation valve and non return valve must be installed on the
cold water line to the water heater. An acceptable arrangement is
shown in the diagram.
An expansion control valve (ECV) must be installed if required by
the local regulations or if the water quality is scaling in nature.
A pressure limiting valve must be fitted after the non-return valve if the incoming water supply
pressure is higher than 550kPa with ECV fitted or 680kPa without ECV fitted.
A disconnection union must always be provided at the cold water inlet and hot water outlet on the
water heater to allow for disconnection of the water heater.

Hot Water Delivery

This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the water
heater and the hot water outlets in any ablution area such as a bathroom or ensuite, to reduce the
risk of scalding. The installing plumber may have a legal obligation to ensure that scalding water
temperatures are not delivered to a bathroom, ensuite or other ablution area.
Temperature & Pressure Relief Valve
The temperature and pressure relief valve (TPR) is fitted near the top of the water heater and is
essential for its safe operation. The TPR valve protects the tank from the adverse effects of high
o
temperature and pressure. The TPR will open and discharge water when temperatures above 93 C
or pressures in excess of 850kPa are experienced.
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