55
S E R V I C E M E N U : “ A L A R M ”
In this menu alarm limits is set for
Filter timer, Low temperature
and setting for
Fire sensor, Automatic reset
and
Alarm indication
to the alarm port.
”
Filter timer
” can be set from
”Off”
to
”6-12 months”
and generates alarm for filter change.
Filter timer can not be used in combination with another filter measurement, see page 53.
We recommend filter change at least once a year.
To restart the filter timer press “
Reset
” with the -key.
Alarm limits for ”
Low temperature
”.
Alarm limit A
: (+2 till +10ºC but must be lower than ”Alarm limit B”).
Alarm for low rotor temperature is displayed when the temperature is lower than set value. Normally nothing
needs to be done. If “Rotor Alarm” appear at the same time as “Rotor temp. Low” the unit is stopped.
Alarm limit B
: Supply air flow is reduced with one step when the temperature in supply air duct (GT7) is
lower than set value, the temperature efficiency will increase (the temperature can be change from +5 to +12ºC
but have to be higher than ”Alarm limit A”).
If the unit operating at Min. speed the extract air increases one step.
In menu ”
Fire sensor
” type of installed fire sensor is set.
Choose ”Normally open” NO or ”Normally closed” NC depending on
the type of smoke detector.
”Automatic reset”
allows a automatic restart of the unit after
the fire alarm is restored to normal (NO, NC).
In the menu
”Alarm indication”
, the alarm can be associated to the alarm
port on the control board (NO,NC).
If all is choosed this is indicated by
”All”
. If only one or more is selected
this is indicated by
”Selected”
.
Auto.reset: Off
Aut. reset: Off
Not installed
Auto.reset: On
Alarm indication
None
Alarm indication
Fire alarm
Sensor open
Sensor shorted
Alarm indication
Fire alarm
Sensor open
Sensor shorted
3
Alarm indication
Overheating
Freese alarm
Supply temp. low
Alarm indication
Rotor temp. low
Fan failure
Rotor failure
Alarm indication
Rotor failure
Filter
Filter timer
Alarm indication
All
Alarm indication
Selected
Reset
2
2
2
Overpressure
Max temperature
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Summary of Contents for HERU LP
Page 10: ...10 REGLERSCHEMA HERU LP som visar samtliga givare fl desriktning h ger...
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Page 44: ...44 CONTROL DIAGRAM HERU LP shows all sensors flow direction right...
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