- RESET -
- ON
-
- SET -
- OFF
-
0. 0. 0. 0.
3
Leaflet Number 671366 July 2007
Installation and Maintenance
mrXbox90S Mechanical Ventilation with Heat Recovery
4.0 Outline description
The Nuaire mrXbox90S is a highly advanced heat recovery unit,
specially designed for minimum energy consumption and maximum
comfort. This is achieved with the aid of various electronic control
systems. A control unit with microprocessor controls/monitors the
safe operation of the unit and ensures that the air quantities remain
constant, and at the preset values. The mrXbox90S incorporates a
control panel with display, enabling stepless adjustment of the volume
without having to open the unit. Moreover, information regarding the
operation can be read out from the outside of the unit.
4.1 LED display system and
operating panel
The mrXbox90S control panel positioned on the front panel of the
unit can be used to retrieve and modify the settings in the control unit
program.
The control panel has four keys and a display.
1 = Display
2 = Key “OK” (confirm, ready)
3 = Key increase parameter
4 = Function key
5 = Key decrease parameter
On the left the display indicates the ventilation setting or the
parameter type. on the right it shows the readout value, for instance
the preset volume.
Example:
The display now shows that the unit is running at ventilation setting 3
at a flow rate of 150 m
3
/h.
The four keys have the following functions:
•
F
Function key/switching on and off parameter menu
•
+
next parameter/increase value
•
-
previous parameter/decrease value
•
OK
Switching on and off settings menu/manual fault reset
Other commands can be entered with key combinations:
•
F
and
+
(set), confirm parameter value
•
F
and
-
(reset), reset filter indication, parameter value back
to factory setting
•
OK
and
+
(ON), switch on unit
•
OK
and
-
(OFF), switch off unit
This applies throughout this manual when a key has to be pressed,
The key in question is printed in quotation marks and in bold.
Example: - press key
“OK”.
4.2 Frost safety
The frost protection system ensures that the secondary side of the
heat exchanger (outlet side) does not freeze up by introducing an
imbalance between the inlet and outlet air flows, dependent on the
outside air temperature and the pressure across the heat exchanger.
Under severe conditions the inlet air flow will shut down.
NB: Settings are not adjustable.
4.3 Filter indication
The unit is fitted with a filter indication system. It indicates on the
display when the filter is fouled. For more detailed information refer
to section 9.
- RESET -
- ON
-
- SET -
- OFF -
3. 1 5 0
1
2
3
4
5
Figure 4. Control panel
Figure 5.
