Carrier 33AW-CS1 - Special Features; Room Temperature Sensor Adjustment; Shortcut to Frequency Reduction Mode; Room Air Temperature Sensor Failure

15
Special Features
What If !
Room Temperature Sensor Adjustment
Short-Cut to Frequency reduction Mode
You get a system error message
NUI oers a feature where you can add or subtract an oset
to the displayed room temperature. This allows the NUI to
display the correct temperature of the room even if the NUI
is installed at a location where there is a slight dierence in
temperature.
In this case, the TROOM SENSOR ADJ variable can be
modied in a range of +5°C / -5°C and this value will be
mathematically added to the real Room sensor value. Refer
to parameter number 13 of Features Table (Page number
13).
Here are the possible system error messages and what they
mean:
Room Air Temperature Sensor Failure
If the sensor used to sense room air temperature, reads less
than -45°C or greater than 65°C, it will be considered as
failed and will display “--”.
Humidity Sensor Failure
If the sensor used to sense room Humidity reads less than 0
HR% or greater than 99 HR%, it will be considered as failed
and will display “--”.
EEPROM Failure
If the thermostat non-volatile memory (EEPROM) has failed,
an “E4” error will be shown in the room air temperature
display. When this error is present and power is cycled to
the thermostat all of the installer congurations, program
schedule settings and user settings will be factory default
values.
This may results in incorrect equipment operation and is not
recoverable. In this case, the thermostat must be replaced.
Communication Failure
If the NUI does not receive CCN communication data from
the CDU for 60 seconds, the display will show “E3” error code
in the Temperature display zone and ‘-‘in the Time Display
zone. Under this condition the outside temperature will
be blanked. “E3” error code will be displayed and the other
functionality will remain same. If this happens then check
the communication cable between NUI and outdoor unit.
Press the active key among Hold (
) key for 10 seconds
to make Night mode active and can de-activate the Night
mode by pressing the Hold (
) key again for 10 seconds.
When Frequency reduction / Night / Silence mode is active,
NUI will display the (
) Icon. If FR mode is active, this will
always override the selection done in program schedule.
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