Subject to changes in line with technical progress.
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Servicing and maintenance
1
Wiring of safety temperature limiter control
8
Display
2
Holder
9
Maintenance door, left
3
Reset button
10
Turn lock
4
Safety temperature limiter (STL)
11
Main switch
5
Electric air heater
12
LED status display
6
Control unit
13
Basic unit
7
INFO
button with integrated LED
14
ALARM
button with integrated LED
7.4.3 Resetting the safety temperature limiter
The safety temperature limiter (4) can trigger automatically to protect the electric air heater against overheating. The
electric air heater (5) is then switched off; no further additional heating of the supply air flow takes place. This is indicat
-
ed by
the red status display LEDs (12) on the basic unit and
ALARM
(14) on the control unit (7). The display (8) of the
control unit indicates an alarm.
The automatic tripping must be reset manually; to do this, proceed as follows:
Step
Action
1
Make sure that an alarm displayed on the control unit (10) is indicating a malfunction of the safety temperature limiter.
2
Switch off the compact air handling unit (see chapter "6.2.4 Switching off the unit" on page 35).
3
Ensure that the main switch (11) is in the
O OFF
position and secured against unintended restart.
4
Disconnect the unit plug.
5
Route the mains lead so that it does not pose a tripping hazard.
6
Ensure that the unit has cooled down sufficiently and that the fans are completely stationary.
7
Unlock the two turn locks (10) of the left-hand maintenance door (9) of the basic unit (13) with the double-bit key.
8
Open the left maintenance door (9).
9
Check that the electric air heater (5) is sufficiently cooled; do not reach into the unit with unprotected hands.
10
Determine the cause of the malfunction of the safety temperature limiter (4) and eliminate it.
11
Acknowledge the malfunction on the safety temperature limiter (4) by pressing the reset button (3).
11
Acknowledge the malfunction on the control unit (6). In this process, follow the enclosed Operating Manual / functional
description of the
Art Tech Level II control.
12
Close the left-hand maintenance door (9) and lock the turn locks (10) with the double bit key.
14
Connect the mains power supply.
15
Switch on the compact air handling unit at the main switch (11),
I ON
; position; it is connected to the power supply. The
settings made on the control unit before the maintenance work are retained.
16
Note the LED status display (12) and the LED in the
INFO
button (7). Both must light up green.
18
Adjust further settings on the control unit if necessary, such as
fan step
and
operating mode switch
. In this process,
follow the enclosed Operating Manual / functional description of the
Art Tech Level II control.
7.5
Circuit diagrams
NOTE
Further information can be found in the
electrical documentation
.
