PVI Industries PV500-12 - Manual (Page 15)

TURBOPOWER 99

WATER HEATER
PV500-12 08/12 15
10 GENERAL INFORMATION
10.1 Temperature and Pressure Relief Valve(s)
Pipe the relief valve discharge to a suitable open drain. The drain pipe may not be smaller than the relief valve
opening and must be secured to prevent it from lifting out of the drain under discharge pressure. Do not install
valves or restrictions in the discharge line.
10.2 Lower LED Readout
An adjustable digital operating control is located in the front control panel. The control is factory pre-set at
approximately 120
º
F.To adjust the setpoint to deliver the desired water temperature, press and release the Set 1
key on the face of the control. When setpoint adjustment is enabled, use the arrow keys to adjust the set point to
the desired system temperature. See TempTrac Electronic Controller Panel in this manual for more information.
10.3 High Water Temperature Limit Control
Appliances are equipped with adjustable limit and fixed high limit controls to control the maximum discharge
water temperature. These controls are located inside the control cabinet. The high limit control is optionally
available as the manual reset type and may be reset by pressing the limit reset button accessible through the
control panel cover. The adjustable limit is of the auto reset type and can be dial adjusted to operate just above
the set point of the main operating temperature control. Pressing the reset on the high limit control will not cause
the control to reset until the water temperature has dropped below the set point of the manual reset high limit
control.
WARNING: Turn off all electrical service to the appliance when accessing the limit or high limit controls
located inside the control cabinet. This cabinet contains High Voltage wiring and terminals. If the
electrical service is not turned off and these terminals are touched, a dangerous shock causing personal
injury or loss of life could occur. Close and fasten the control cabinet cover before restoring electrical
service to the appliance.
10.4 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.
10.5 Thermal Expansion
A relief valve that discharges periodically may be due to thermal expansion in a closed system, such as water
heaters or hot water supply boilers installed in a system closed by components, such as a backflow preventer or
check valve in the cold water supply or a closed boiler heating loop. These systems must be provided with
means to control expansion. Contact a water heater or plumbing professional to resolve this situation. Do not
plug the relief valve.