4.4.2 Filter Life Monitor
The system is equipped with an electronic Filter Life Monitor that calculates the remaining life of the sys tem’s filters.
Thanks to the Filter Life Monitor, the user does not have to guess when filters need to be replaced or replace them
at fixed intervals (which rarely correspond to the actual amount of use). The Filter Life Monitor watches over the most
important factors affecting the life of the individual filters. The Filter Life Monitor display shows the remaining life of
each individual filters at any given time.
1.
To reach the Filter Life Monitor display from the main display win dow,
press the
Menu
key once. The remaining life of the filter 1.
will appear.
2.
Press the
p
key to view the remaining life of the next filter in the system.
3.
The remaining life of the filters is expressed in hours of operation at the
current speed setting and the programmed filter load indices.
How the Filter Life Monitor Works
The basis for the calculation of the remaining filter life is the already elapsed operation time at the set fan speeds and
filter load indices during that period. This input is compared with an internal memory bank which contains infor -
mation about the different filters’ lives under specific conditions of use.
The Filter Life Monitor makes a calculation of the remaining filter life, taking into account not only past use of the
system, but also likely future use. As reference for future use, the filter life monitor uses the fan speed and the filter
load indices which are programmed at the time.
The relationship between the current fan speed, the current filter load indices and the remaining filter life displayed
can be expressed as follows:
•
The higher the current fan speed setting, the shorter the displayed remaining filter life.
•
The higher the current filter load index setting, the shorter the remaining filter life displayed for the affected filter.
7. Filter Life Reset
Allows the resetting of the filter life counter after replacing a filter
element.
8. Airflow Units
Allows to switch the airflow units between cfm (cubic feet per minute)
and m
3
/h (cubic meters per hour).
9. Language
Allows the modification of the display language.
10. Filter Load Index Setting
Allows the modification of the air pollution index, so the system can
calculate the remaining filter life, taking pollution intensity into account.
11. Service Access
This menu is designed for factory access only.
14
Chapter 4
– Using the Control Panel
