EH-105
ADDITIONAL INFORMATON ABOUT ON/OFF INPUTS
EH-105
AH unit control by switches or press buttons (closing contact) connected to the controller:
Contact information that switches on the EMERGENCY-STOP switch. Bypasses the
clock program and other controls and ensures that the AH unit is shut down by
interrupting the relay 3 locking circuit (opening contact). Restart after the alarm
disappears according to the choice “No acknowledg./After acknowl.”.
Explanation:
On the display:
1/1 (1/2) PowerSw
MIN (MAX)PowerSw
Auto switch
Emerg.Stop
C
:
The AH unit is driven to the desired output by external switches or press buttons
(bypasses the clock program). The running time is given in the maintenance mode that
sets the amount of time the AH unit is at the output in question after the press button is
depressed or the switch is freed.
Running information about AH unit control and contradiction alarms (see p. 17):
Running information about AH unit fans.
Running information about AC freq. converter controlled AH unit fans (closing switch
info). Running period control begins when SF running information is received. SF and
EF running information is also used to give contradiction alarms and EF running
information is used to give deviation alarms when contradiction alarms have not been
selected.
AC freq. converter override (e.g., AC freq. converter maintenance). The controller drives
the AH unit to max. output and gives an AC freq. converter override alarm.
SF 1/1 drift
EF1/1 drift
C
SF drift
EF drift
C
Information about automatic control from an external hand switch. If there is no switch
information, the AH unit can only be started up by external switches 1/1 or ½ or by an AC
freq. converter's override switch (SF fConvOver/ EF fConvOver)
C
C
C
SF fConvOver
EF fConvOver
Fan pressure difference switch information. A contradiction alarm is given regardless of
the AH fan alarm selection (Actuator alarm/AH fans selection, p. 32) if the SF or EF
pressure difference switch contact is open 30 s after SF running information (on/off input
or strip conn. 81) is received. A contradiction alarm is also given by the Actuator alarm/AH
fans/ContradicAlrm selection if running information has not been received and the SF or
EF pressure difference switch contact closes.
AH unit heating pump running information. The controller gives a pump alarm (stops the
AH unit) if pump running information is not received (no pump alarm if the controller has
stopped the pump).
AH network main heating pump running information. The controller gives a pump alarm
without an additional alarm (shuts down the AH unit), when the outdoor temperature is
below +12 °C and main pump running information is not received. An additional alarm is
not given after a pump alarm.
”No acknowledg” selection: when the outdoor temperature is below +12 °C, the AH unit
starts up 5 min after the alarm disappears if the heating actuator is 20% open(at the most)
and the return water temperature is above the ”Radiator RetT” set value -3°C. If the
outdoor temperature is above +12°C when the alarm disappears, the AH unit starts up
immediately.
HRU pump running information. The controller gives a pump alarm if HRU pump running
information is not received while the AH unit is running and the controller has not stopped
the pump.
Cooling pump running information. A pump alarm is given if the AH unit is running and
the controller has given a cooling permit and running information is not received from the
cooling pump.
SF fan PDS
EF fan PDS
C
Pump run
+
MainPumpRun
Pump run
+ -
Pump run
-
Contact information from the temp. relay (from the overload protector) for alarms, AH unit shut down or
speed changes:
Alarm information from the AH unit fan's temp. relays. If the supply fan or exhaust fan
temperature relay is triggered (the contact closes), a temperature relay alarm is given
and the AH unit is shut down. Exception; two-speed units whose controller given control
changes from 1/1 to ½ if the SF 1/1 or EF 1/1 temperature relay is triggered
(temperature relay alarm is given regardless). (In AC freq. converter controlled AH
units:SF TRela, EF TRela)
SF 1/1 TRela
SF 1/2 TRela
EF 1/1 TRela
EF 1/2 TRela
C
AH start after
alarm is deactiv
No acknowledg.
After acknowl.
45
