PVI Industries Water Heater User Manual

PV500-33  05-2002 

3 

Section 33 

1.  Check rating plate on water heater for correct voltage, phase and amperage. Refer to wiring 

diagram for control component identification. 

 

2.  Use a proper wire size and branch circuit protection as required by the National Electrical Code 

and state/local codes. PVI electric water heater specification sheets show number and size of 
power connectors furnished with the heater for a minimum 90°C copper connecting wire. 

 

3.  Use correct size ground wire; attach to pressure connector marked “GR” inside the control 

enclosure. 

 

4.  Connect supply feeders to distribution block inside the control enclosure. Conduit openings 

have been provided for electrical connection and remote alarm circuitry as required. All holes 
should be sealed with appropriate threaded hole plug if not used. 

 

5.  A float type low water cut-off switch has been provided to de-energize the heating circuit when 

a low water volume is present. 

 
 

 

1.  Secure and lock-out electrical feed power circuit to water heater. 

 

2.  Check components to assure secure fit during transport and installation. Check wiring 

connections in junction box for full contact and tight connection. 

 

3.  Inspect conduit seals between the control enclosure and heating element junction boxes to 

ensure that they have been sealed. 

 

4.  Plumb water connections with appropriate shutoff valves, expansion tanks and check valves per 

local plumbing codes. 

 

5.  With water outlet valve closed, open relief valve and water inlet valve, and fill tank with water 

before turning on electricity. Dry energizing water heater immersion elements will burn out 
elements rapidly and void the element warranty. When water exits relief valve, close relief valve 
and continue to fill until tank is full. 

 

6.  Energize the main power circuit. Check power distribution to circuits with electrical meter to 

assure proper power supply and operation. If improper readings are indicated, de-energize the 
unit, disconnect the power lines to the unit and review wiring diagram for proper connection. 
Check fuses to assure tight connection or any signs of failure. 

 

7.  To set the operating thermostat, remove the heating element junction box screw cover. (The 

thermostat is located in one element housing only  - check upper element first for thermostat 
location.) A dial type thermostat has been selected for ease of use. Align desired temperature 
(°F) with element temperature indicator mark and secure cover.