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Installation Manual
12.1 High Limit Switches
WARNING: ELECTRICAL HAZARD
Failure to disconnect the power from the water heater
before attempting to install or repair it will result in property
damage, severe personal injury, or death.
Occasionally, the high temperature limit switches may trip, resulting in power
being shut down as a safety precaution. This can happen if the water temperature
exceeds 135°F/57°C. For the water heater to be put back into operation, the
tripped high limit switch will need to be reset.
The reset method will depend on which type of switch as tripped;
1. If the high limit switch has a button in the center of it; This is a manual high
limit switch. To reset, please fi rst ensure that all circuit breakers that supply
the water heater are turned OFF (NEVER attempt to reset a manual limit
switch with the power supplies still on!). You can then press the reset
button. If you hear a click, then this high limit switch was tripped and you
have now reset it. Turn the circuit breakers back on and run a hot water faucet
to test that the water heater activates.
Figure 32
2. If the high limit switch has NO button on it; This is an automatic-reset high
limit switch. Once the overheat condition has ended, this type of high limit
switch should reset itself. Open the hot water faucet and allow about one
minute for limit switch to reset. If the limit switch has not reset itself, it may
be necessary to test the switch for failure. To test an automatic high limit
switch, please do the following;
a. First, ensure that all circuit breakers that supply the water heater are
turned OFF.
b. Use a multimeter to test for continuity across the cooled limit switch. If
you have continuity, the switch has reset and power will fl ow across it. If
you have no continuity across the limit switch and it is cool to the touch,
it may have failed and will require replacement
CAUTION: PRODUCT DAMAGE, PROPERTY DAMAGE
Repeated tripping of the High Limit Switch (TCO) indicts a
problem. Call a technician if the high limit needs to be reset
frequently.
Measure resistance across contacts after resetting and note
value.
3 0 |
12.2 Checking Thermostat Operation
To check thermostat operation:
1. Press the
button to activate the heater. The display will show the outlet
temperature.
2. With the water running through the unit, press
decrease the outlet temperature. The recommended temperature setting is
120°F (49°C).
A lower setting is more economical and reduces the risk of scalding.
3. After adjusting the water temperature, allow the heater enough time to heat
the water to temperature. Then use a thermometer to measure the water
temperature at a hot water outlet in the structure.
Bosch Tronic 6100 C Electric Tankless Water Heaters - BTC 724001301 A (08.2022)
to increase or
to
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