Function - Bosch TRONIC 3000C Pro US3 Installation Manual And Operating Instructions

2.7

Function

How the water heater works:
• Water comes in through the cold water inlet.
The heater is designed for cold water supply
only. Do not supply with pre-heated water.
• The flow switch senses how much water is passing through
the unit. If it detects more than the preset level, the unit's
heating elements switch on. This is shown by the neon light
glowing.
• The water is heated instantly as it passes through the
copper heat exchanger tube.
The temperature of the water coming out of the unit depends
on:
• The voltage of the electrical supply,
• The temperature of the incoming water supply,
• The setting of the power selector,
• The flow rate,
• The power rating of the unit.
Model Volts Amps
US9 240 40
US9 240 20
US9 208 35
US9 208 18
US6 277 22
US6 277 11
US3 120-110 27
US7 240-220 30
US7 240-220 15
Table 4
Manual reset thermal cut-out
The unit has a thermal cut-out (Fig. 1 ) which is mounted on
the heat exchanger tube. This will switch off the heater
elements if the water temperature goes above 194 °F.
If the cut-out trips it will need to be reset manually inside the
unit. This cut-out will only operate in exceptional
circumstances (Fig. 3 ). Call your service person or Bosch
Water Heating if this happens frequently.
TRONIC 3000C Pro
Element High
Resistance Setting
2x12 9,5kW
1x12 -
2x12 7,1kW
1x12 -
2x25 6,0kW
1x25 -
2x8 3,4-3,0kW
2x16 7,2-6,1kW
1x16 -
• 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 50 °F.
Fig. 3
[A] Manual reset thermal cut out
The table below shows the rise in water temperature you can
expect from the unit:
Low Setting Temperature Rise (deg F) at Flow Rate (GPM)
0,5 0,75
GPM GPM
- NA
4,75kW NA
- NA
3,5kW NA
- 81F
3,0kW 41F
- 41F
- NA
3,6- 3,05kW NA
Information about the heater | 7
1,0 1,5
GPM GPM
84F 64F 42F
42F 32F 21F
64F 48F 32F
32F 24F 16F
55F 42F 27F
28F 21F 14F
28F 20F NA
63F 48F 32F
32F 24F 16F
6 720 647 005 (2014/04)
2,0 2,5
GPM GPM
32F NA
16F NA
24F NA
12F NA
NA NA
NA NA
NA NA
24F NA
12F NA