Landis & Gyr ULTRAHEAT T550, Installation Instructions Manual, Page: 5 / 6

Gyr GmbH Subject to change without prior notice 08.05.2017 5
Select first module function for module 2
(CE or C2)
Select second module for module 2
(CV or CT or RI)
Select maxima measurement period
(7.5, 15, 30, 60 min / 3, 6, 12, 24 h)
Pulse value
Mounting place of the flow (here: cold side)
Return to normal mode
* Ensure that sensible values are entered. The calculator does not carry out a plausi-
bility test. This means that incorrect values can also be entered (e. g. month > 12).
Note: The calculator can be parameterised even if
the modules have not yet been installed.
4.3 Parameterisation of pulse value and mounting
place of the flow sensor
Attention: Calculators with one-time adjustable
pulse value and adaptable mounting place being
characterized by:
The pulse value must be set in the para menu before the first
use. The right mounting place of the flow sensor must be
checked
. As long as the pulse value hasn’t yet been entered,
the mounting place can be adapted.
Pulse value
Mounting place of the flow sensor (here: cold side)
Return to normal mode (manual)
Both entries will be adopted with the return in the normal oper-
ation and subsequently cannot be changed anymore!
LCD display will adopt automatically.
4.4 Call up parameter operation
Proceed as follows to call up the parameter operation:

Hold the service button for 3 seconds until
appears on the LCD.

Press button 1 to switch the display until
appears on the LCD.

Press button 2 to select the menu.
Note: To reset error F8 or the maxima press button 2.
4.5 Selecting parameters
To select a parameter proceed as follows:

To switch the display press button 1.

To activate the parameter to be changed press button 2.
4.6 Parameterisation
For parameterisation proceed as follows:

To change the blinking value press button 2.

To enter the set value press button 1.
The next digit to the right blinks. Repeat the steps above for all
digits.

The LCD displays a star symbol briefly to confirm.
If inputs are incorrect, parameterisation can be repeated.
4.7 Completing parameterisation
To leave the parameterisation operation proceeds as follows:

Hold button 1 until the LCD shows .

Press button 2.
4.8 Cancelling Input
To close the parameterisation proceeds as follows:

Press the service button during parameterisation (ESC
function).
The LCD display shows the last valid value.
4.9 Service software
With the service software, tariffs and communication modules
can be set in parameterisation mode
5. Getting started
Attention: Calculators with one-time adjustable
pulse value and adaptable mounting place being
characterized by:
Attention: At calculators with one-time adjustable
pulse value, the pulse value must be adjusted during
commissioning in accordance with the flow sensor
and the mounting place must be checked!
At long as not the pulse value has be set, the calcu-
lator not cumulated energy and volume.
The mounting place can be adapted and fully locked
by entering the pulse value.
For activation proceed as follows:

Put the housing cover in position and press it gently until all
the lugs click into place audibly.

Check the measured values for flow and temperatures for
plausibility.

Fit the user locks to the electronic unit and the temperature
sensors.

Note the values.
Recommendation: Reset the maxima and the missing time.
Error messages for incorrect installation:
Error “negative temperature difference“
Check whether the temperature sensors are installed
correctly. If the sensors are not installed correctly, change
the installation position of the temperature sensors.
Heat meter :
Temperature sensor in the flow-pipe with higher tempera-
tures; temperature sensor in return-pipe with lower tempera-
ture
Cooling meter:
Temperature sensor in the flow-pipe with lower temperatures;
temperature sensor in return-pipe with higher temperature
Note: When the appliance is idle, these messages may
appear even if there has been no incorrect installation.
6. Display / priority rating
The display is limited to up to 7 digits. At pulse parameteriza-
tion, the resolution will adapt automatically.
The display resolution can be selected from the following:
Pulse Energy Energy Volume Flow Power
[l/p] [MWh] [GJ] [m³] [m³/h] [kW]
1 0000.001 0000.001 00000.01 000.001 00000.1
2.5 0000.001 00000.01 00000.01 000.001 00000.1
10 00000.01 00000.01 000000.1 000.001 00000.1
25 00000.01 000000.1 000000.1 000.001 00000.1
100 000000.1 000000.1 0000001 0000.01 000001
250 000000.1 0000001 0000001 0000.01 000001
1.000 000000.1 0000001 0000001 0000.01 000001
2.500 000000.1 0000001 0000001 0000.01 000001