6.2 Other user settings
In addition to the air quantities per setting, the user can also adjust
the following parameters.
U4.
Minimum atmospheric temperature bypass. this is the minimum
atmospheric temperature at which the bypass opens, also when the
indoor temperature satisfies the conditions. (Factory set @ 10
o
C).
U5.
Minimum indoor temperature for the bypass. this is the minimum
indoor temperature at which the bypass opens, when the atmospheric
temperature also satisfies the conditions. (Factory set @ 22
o
C).
These two setting possibilities are made in the same manner as
described in section 6.1.
6.3 Installer settings
Various other settings of the control unit can also be modified.
Because some settings have an influence on the correct operation of
the unit, these have been placed in a separate installer parameters set.
Consequently, these parameters can only be modified by the installer.
How to modify these is explained in section 7.6.
1. Fixed imbalance
This can be used to keep the pressure in the dwelling at a higher
(+)
or lower
(-)
level than the atmospheric pressure.
Positive imbalance (+):
the output fan ventilates the set value in
(m
3
/h) less than the input fan.
Negative imbalance (-)
: the input fan ventilates the set value in
(m
3
/h) less than the output fan.
2. No contact step
This setting determines the ventilation position when no switch
contact is connected to position 1; the unit will start running at
the ventilation position set here.
3. Not applicable
4. Switch line 1 step
Determines what position of the multiple switch matches line 1 on
the control unit.
5. Switch line 2 step
Determines what position of the multiple switch matches line 2 on
the control unit.
6. Switch line 3 step
Determines what position of the multiple switch matches line 3 on
the control unit.
7. Imbalance permissible
This determines whether for instance the frost protection may
affect the imbalance.
8. Bypass mode
There is a choice between 3 situations.
Mode 0
The bypass valve is not operated
Mode 1
The bypass valve - if installed - is opened when
(standard
The temperature conditions are complied with
setting)
Mode 2
The inlet fan starts running at the lowest possible
rpm if the temperature conditions are complied with
9. Hysteresis bypass
Here you can enter how much the indoor temperature may drop before
the bypass closes or the inlet fan starts running at the normal rpm.
10. Constant pressure switched off
Here you can set whether in all cases the fans are running at constant
flow or that they start running at constant pressure when a certain
resistance is exceeded.
Refer to the table in section 7.7 for the factory setting.
11. Pre-heater or post-heater
This indicates whether a preheater or postheater is connected.
Setting 11.
Situation
0
No pre-heater or post-heater
1
Pre-heater connected to basic pcb
2 & 3
Only use this selling for option pcb
12. Temperature pre-heater
This sets the offset temperature preheater.
13. Filter message
Sets whether the filter message is shown on the display and the LED
of the 3-way switch.
14. Presence option pcb
This indicates whether an option pcb is mounted.
15. Heat recovery configuration
Option setting when heat recovery is used in combination with central
heating; only heat recovery or the combination central h
heat recovery.
Only heat recovery = 0; Central h heat recovery = 1.
16. Fan setting for central h heat recovery
Fan(s) off for central h heat recovery
(only applicable if 15 = 1).
Setting 16.
Situation fan(s)
1
Output fan off
2
Input fan off
3
Both fans off
17. Repeat time in hours
for switching off the fan(s) selected under 16 for central h
heat recovery.
18. Maximum switch-off time
in seconds for the fan(s) selected under 16 for central h
heat recovery.
19. Minimum switch-off time
in seconds for the fan(s) selected under 16 after switching on 230V
for central h heat recovery.
Refer to the table in section 7.7 for the factory setting.
9
Leaflet Number 611272 January 2012
Installation and Maintenance
MRXBOX90L Mechanical Ventilation with Heat Recovery
