Error Messages - Landis+Gyr ULTRAHEAT T450 Installation Instructions Manual

Figure 12: Temperature sensor connection
• Connect the wires according to the printed wiring diagram.
The connection is made to terminals 5/6 (warm side
temperature sensor) and 7/8 (cold side temperature
sensor).
• Insert the temperature sensors into the thermowells, ball
valves or T-pieces. The temperature sensor must sit on the
bottom of the thermowell.
• Seal the temperature sensors to prevent manipulation.
• Close the housing cover by tightening the screw (see
chapter Torque) and press the housing cover tightly into
place.
If the LCD displays , you can reset this error message via
the parameterisation menu. Please refer to the service manual.
10 Commissioning
Proceed as follows when carrying out the commissioning:
• Close the housing cover by tightening the screw (see
chapter Torque) and press the housing cover tightly into
place.
• Slowly open the gate valves.
• Check the system for leaks and vent it carefully.
The message F0 disappears after 100 s at the latest.
• Check the flow and temperature indicators for plausibility.
• Vent the system until the flow display [ID 000] is stable.
• Attach user guards to the calculator and temperature
sensors.
• Document the meter readings.
Recommendation: Reset the maximums and the absence
time. More details can be found in the T450 service manual.
11 Error messages due to incorrect installation
Note
When the system is at a standstill, these messages can also
be displayed without incorrect installation
© Landis+Gyr
Error "Incorrect flow direction
(negative)" Check whether the
flow direction arrows on the
volume meter correspond to
the flow direction of the
system. If the directions do not
match, rotate the volume
meter 180°.
Subject to change without prior notice
12 Display
The functions of the LCD are described in detail in the operating
manual included.

13 Error messages

Note
Reset the message F8 in parameterisation mode manually
or with UltraAssist. All other error messages are
automatically deleted after the error has been corrected.
The meter regularly performs a self-diagnosis and can recognise
and display various errors and error messages.
Table 1:
Error code Error
Wrong flow
direction
Possibly alternating with:
Negative
temperature
difference
Possibly alternating with:
No flow measurable Air in measuring
Error "negative temperature
difference" Check whether the
temperature sensors are
correctly installed. If the
temperature sensors are not
correctly installed, swap the
installation location of the
temperature sensors.
Heat meter: Temperature
sensor in the flow pipe - pipe
with higher temperatures;
Temperature sensor in the
return pipe - pipe with lower
temperatures
Cooling meter: Temperature
sensor in the flow pipe - pipe
with lower temperatures;
Temperature sensor in the
return pipe - pipe with higher
temperatures
Information for
Service
Check flow and
installation
direction and
correct as necessary
Check installed
position of
temperature
sensor; change if
necessary
part/tube, bleed
the line (status at
delivery)
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