T
echnical manual OT-600-060/1
Page 10
9. Annual check of Main Unit
The system must be checked annually by a qualified technician. The following shall then be tested:
•
Visual control of the Main Unit and Hand Controller as well as all hoses and cables.
•
Complete electrical safety test.
•
Check that the main unit is ”air tight” i.e. the compressor is working less than 10% of the time.
•
Check of safety functions as per the list below.
a) Normal start and running.
Connect a standard Mattress to the unit. Connect power cable and Hand Unit. Switch on the
power switch at the Main Unit and note that its green power indicating lamp is lit, that all lamps
on the Hand Controller are lit and that an alarm sounds for about 2 seconds. Start the system
with the start button on the Hand Controller. The default values are +37ºC and 30 mb. Listen
and note that the fan starts once the compressor has inflated the Mattress. Listen and note that
change of air direction takes place every 30 seconds. Listen for unusual fan noise.
b)
When the system is running normally disconnect the power by pulling out the power cable. A
acoustic power alarm will be received. Reconnect the power. An alarm shall now sound from
the Hand Unit, and PO LOS is displayed. Reset the alarm.
c) Hand Controller connection.
Start the system and disconnect the cable to the Hand Controller. An intermittent acoustic alarm
will sound and the system shall stop after about 5 seconds. Reconnect the hand controller and the
system will alarm and display PO LOS. Reset the alarm.
d)
Safe pressure / temperature regulation.
Start the system. Set the temperature to +36ºC and the pressure to 60 mb. Step up the
temperature to 42ºC and note the pressure is stepped down to 35 mb.
e) Control of the air (mattress) temperature
With a mattress connected, start the system with 42ºC & 30 mb. Place an accurate
thermometer/probe, preferably an FLUKE 52 II, in good contact with the air stream at the centre
of the mattress. Place a piece of insulating material on top of the probe to ensure good contact
with the mattress surface. Cover the whole mattress with a sheet. The system should operate >
10 min. with the system in thermal balance (the green temperature indicator permanently lit)
before any reading is done. The received temperature should read set temperature ± 1ºC
f) Check of error code 008, sudden drop of pressure.
With the system running, disconnect one of the air hoses. Note that Err 008 is shown and
that
the unit goes to stand by. Reset the alarm.
g) Check of error code 006, Air leakage
Start the system without a Mattress connected. Note that the unit alarms with Err 006 after
about 4 minutes and goes to Stand by. Reset the alarm.
h) Correct stop of the system.
Start the system and reduce the pressure to 0 mb. Note that the air valve starts releasing the
pressure. The display will show “h” + the number of running hours, then the software version of
the Main Unit (CP) and last the software version of the Hand Controller (PP)
i)
Check of pressure
Connect a pressure measuring device at the mattress connection as well as a mattress- Check
that the measured pressure is - 5 mb
