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GB.COMPACTAHSK.210520

Registered design. The company reserves the right to make design changes without prior notice.

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7.3 Switch clock

Basic functions for the switch clock can be preset
at INSTALLATION LEVEL under FUNCTIONS/OPERA-
TION and the values can be read and set at USER
LEVEL.

TIME/DATE

The current date and time can be set and adjusted whenever
required.
The switch clock automatically takes leap years into considera-
tion.
Automatic changeover between summer time/winter time to EU
Standard has been preset.
This changeover function can be blocked at INSTALLATION LEVEL
under FUNCTIONS/OPERATION

TIME CHANNEL

Times and days can be set when the unit is to run at high speed,
low speed or be stopped.
Eight different time channels can be set. If the same in-operation
times are to apply every day of the week (Mon-Sun), you need
only program one time channel. Different operation times for
each day of the week can be programmed by programming a
time channel for each day (Mon-Fri, Sat-Sun or Mon, Tues, Wed,
etc)
The time can be set as 00:00-00:00 if the deviating in-operation
period is desirable for the entire 24 hours period.

YEAR CHANNEL

The year channels make it possible to set deviating in-service
times for parts of the day during certain parts of the year. Eight
different year channels (yearly time schedules) can be set. The
year channels over-modulate the time channel during the hours
of the day and the days that the year channel is active. The year
channel dates indicate the dates between which the year chan-
nel shall apply and the year channel hours indicate the hours of
the day between which the year channel will steer the controller
to operate the rotary heat exchanger at a specified speed. Other
times within the year channel still apply to that time channel.
The time can be set as 00:00-00:00 if the deviating in-operation
period is desirable for the entire 24 hours period.
Functions for summer night cooling, prolonged operation, etc.,
operate also when the year channel is active.

7.4 Filters

(and anti-frosting function of rotary heat exchanger)

There are two types of filter monitoring:
Calculated filter monitoring (preset at factory) monitors the fan’s
speed increase conditional on the degree of fouling in the filter.
The calibration involves taking airflow and fan speed readings.
An alarm is initiated when the fan speed has increased by 10%
above the preset alarm limit.
Filter monitoring with a pressure sensor (accessory) measures
the pressure drop across the filter. The alarm limit is preset in Pa.

7.4.1 Readings

When reading the filter status, the first value shows current value
and the second value shows current alarm limit.

7.4.2 To Calibrate the Filters

The filters must be calibrated for the first time during commis-
sioning, when the duct system has been installed and adjusted.
After that every time filters are replaced.

Calibration should be activated for both the supply air and the
extract air if both filters are changed or for only for one airflow
direction if only one filter has been changed.
When filter calibration has been activated, the unit runs at high
speed for about 3 minutes.
After the filter has been calibrated, a speed increase of 10%, or
a pressure rise (= fouling of the filters) of 100 Pa is permissible,
after which an alarm is initiated indicating a fouled filter.
The alarm limit can be changed at INSTALLATION LEVEL under
ALARM SETTINGS.

7.4.3 Calibration - Rotary Heat Exchanger

If the anti-frosting function accessory for heat exchanger is in-
stalled (see 9.6.1.1) calibration can be selected from this menu.
When calibration R-HX is activated the fans are accelerated to
high speed for about 3 minutes.

SWITCH CLOCK

*SWITCH CLOCK*
TIME/DATE
TIME CHANNEL
YEAR CHANNEL

Settings:

Value

Setting

Factory

range setting

TIME/DATE
Day

Mon-Sun

Automatic

Time

00:00-23:59