EZ Plate™ Storage Water Heater
7
PV500-64 12/14
11. After checking for leaks, the heat exchanger and all boiler water and hot potable water piping must be
insulated to the minimum pipe insulation thickness specified in ASHRAE 90.1, “Energy Standard for Buildings
Except Low-Rise Residential buildings.” Insulate or otherwise protect cold water supply lines if subject to
freezing during operation or shutdown periods.
WARNING: Insulate or guard all surfaces containing hot water. Uninsulated or unguarded surfaces
containing hot water can be hot enough to cause severe burns instantly, if contacted. Failure to insulate or
guard all surfaces containing hot water can result in property damage, personal injury, or death.
Isoler ou protéger toutes les surfaces contenant de l'eau chaude.
4.2 Storage Tank Temperature and Pressure Relief Valve Piping
The EZ Plate water heater storage tank is supplied with temperature and pressure relief valve(s) sized in accordance
with the ANSI/ASME Boiler and Pressure Vessel Code, Section IV. The relief valve(s) must be threaded directly into
the dedicated relief valve fitting(s) located near the top of the storage tank and each relief valve discharge must be
separately plumbed to an appropriate floor drain. The discharge line must not be smaller than the relief valve
opening, must allow complete drainage of the valve and line and it must be positioned in the floor drain, such that
water or steam forcefully exiting the drain line does not openly splash.
The water heater must not be operated without a correctly installed, properly sized and properly operating relief
valve. If a replacement relief valve is required, it must be of the same type, temperature and pressure rating, and
relieving capacity as the original relief valve supplied with the water heater.
Do not plug or restrict the relief valve or the relief valve drain line.
It is strongly recommended that the relief valve(s) should be manually operated at least once a year. If water does
not freely flow from the manually operated relief valve or if it does not fully reseat when released, the relief valve
must be replaced with a new relief valve meeting the same ratings.
WARNING: Do not install a reducing coupling, valve or other restriction between the relief valve discharge
and a suitable floor drain. Such restriction could prevent the valve from fully relieving if the pressure
settings are exceeded, which could result in property damage, personal injury or death.
WARNING: Secure the relief valve piping to a suitable floor drain such that very hot water does not openly
splash during a significant relief valve discharge. If the relief valve pipe is not routed and secured to a
suitable drain, hot water discharge can result in property damage, scalding and personal injury or death.
IMPORTANT: Thermal Expansion
- A relief valve that periodically discharges may result from thermal expansion. If
the water heater is installed in a system closed by components, such as a backflow preventer or check valve in the
cold water supply, the system must be provided with means to control expansion. Contact a water heater or
plumbing professional to resolve this situation.
4.3 Cathodic Protection
PVI water heaters do not utilize cathodic protection. However, in hot water systems containing other water heaters
that utilize cathodic protection, hydrogen gas can be produced when the hot water system has not been used for a
long period of time (generally two weeks or more).
Hydrogen gas is extremely flammable.
To prevent the
possibility of injury under these conditions, one of the hot water system faucets should be opened for several
minutes before using any electrical device connected to the hot water system. If hydrogen is present, there is
frequently an unusual sound such as air escaping through the pipe as the hot water begins to flow. Do not smoke,
have open flames or turn electrical switches on or off near the faucet at the time it is open.
