General information | 9US
6 720 646 951 (2011/09)Copyright
Fig. 4 Internal wiring schematic for single phase WH17 unit.
2.8 Function
How the water heater works:
• The Tronic 5000C Pro heats water continuously as it
flows through the heater modules.
• The electronic control PCB monitors the flow rate and
the incoming water temperature and then switches
on the required number of heater elements to reach
the temperature set by the temperature adjustment
dial.
• As the flow rate or the incoming water temperature
changes, the electronic control adjusts the number of
heater elements used so that the outlet temperature
is maintained.
• The outlet water temperature can change slightly as
the flow rate changes due to the steps in power as
different heater elements are switched on and off.
• The outlet water temperature can also vary if the
maximum flow rate is exceeded (see Fig. 11) or if the
supply voltage changes.
• Each heater module is protected by an electro-
mechanical thermal cut-out. This cut-out will only trip
in exceptional circumstances.
Contact Technical Support 800-798-8161 for further
instruction.
• The WH17 unit is supplied from two independent
voltage supplies and the WH27 unit from three
independent voltage supplies. (In Canada the unit has
just one voltage supply).
• Depending on the region of the country, the
temperature of the water supply can vary between
40 °F in winter to 70 °F in summer, with an average of
55 °F. The output temperature and maximum flow of
the heater is dependent on inlet water temperature.
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