POWER VTX
®
WATER HEATER
23
PV500-68 06/16
9
OPERATING AND SAFETY CONTROLS
9.1 Temperature and Pressure Relief Valve(s)
A CSA-listed Temperature and Pressure Relief Valve(s) is installed in the tank.
WARNING: Secure the relief valve discharge pipe to a suitable floor drain such that very hot water does not
openly splash during a significant relief valve discharge. If the relief valve discharge pipe is not routed and
secured to a suitable drain, hot water discharge can result in property damage, scalding and personal injury
or death.
•
Follow the temperature and pressure relief valve manufacturer’s installation instructions and all local, regional
and national codes applicable to temperature and pressure relief valve installation and discharge piping.
•
The relief valve discharge pipe must not be smaller than the relief valve opening and must be secured to prevent
it from lifting out of the drain under discharge pressure and must be routed to allow complete drainage of the
valve and line.
•
Do not plug the relief valve (s) or install a reducing coupling, valve or other restriction in the relief valve(s)
discharge line(s), as this will eliminate the critical water temperature and pressure protection it provides.
•
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. These systems must be provided with means to control expansion. Contact a water heater or
plumbing professional to resolve this situation.
WARNING: Do not plug the relief valve(s), use discharge piping smaller than the relief valve opening or
install a reducing coupling, valve or other restriction in the relief valve discharge line. Failure to comply with
these relief valve and discharge piping requirements can prevent the relief valve from providing its intended
temperature and pressure protection, which can result in property damage, personal injury or death.
9.2 Cathodic
Protection
PVI water heaters do not utilize cathodic protection. However, in hot water systems utilizing 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 will be 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.
9.3
Electronic Low Water Cut-Off
When the water level is above the electrode position in the tank, the reset pushbutton will energize the control (LED
will be lit). The control remains energized until the water level drops below the electrode position (LED will not be lit).
Unless otherwise specified, there is a three-second time delay on decreasing level. Water level must be below tank
probe location for full three seconds before control de-energizes. In the event that a low water condition occurs, a
failure message will be displayed on the controller touch-screen. This failure lockout can be reset by pressing the
LWCO RESET button located on the front control panel. Once the LWCO control board has been reset, the Main
Reset button located on the front control panel can be reset as well.
The Electronic Low Water Cut-Off probe is located on the side and at the top of the water heater tank and is
accessible behind a removeable cover.
WARNING: Turn off all electrical service to the appliance when accessing the limit or other controls located
inside the control cabinet or elsewhere on the appliance. Close and fasten the control cabinet cover before
restoring electrical service to the appliance. The cabinet contains High Voltage wiring and terminals. If the
electrical service is not turned off and these terminals are touched, a dangerous shock causing property
damage, personal injury or death could occur.
Coupez l'alimentation avant intervention sur l'appareil.
