Bosch WH36, Installation Manual And Operating Instructions

Page: 6 / 64

6 720 647 022 (2013/04) Tronic 5000C
6 | Information about the heater
2.7 Wiring diagram
Fig. 3 Internal wiring schematic for single phase WH36 unit.
2.8 Description of the heater
How the Tronic 5000C Pro 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. 8) or if the supply voltage
changes.
• Each heater module is protected by an electro-mechanical
thermal cut-out. If the temperature of any of the heater
modules gets too high, then the cut-out will trip and cut the
power to that heater module. If the cut-out trips, it must be
reset while the circuit breakers are off. If you are not
comfortable or qualified to perform this task, consult the
original installer or a licensed electrician. This cut-out will
only trip in exceptional circumstances.
• Depending on the region of the country, the temperature of
the water supply can vary between 40°F in winter to 80°F in
summer, with an average of 55°F. The output temperature
at maximum flow of the heater is dependent on inlet water
temperature.
DANGER: Risk of electric shock!
▶ Always switch off the electricity supply to the unit before any
intervention in the heater.