ML442 | v5k
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Expo Technologies UK
T: +44 (0) 20 8398 8011
E: [email protected]
Expo Technologies US
T: +1 (440) 247 5314
E:[email protected]
Expo Technologies China
T: +86 532 8906 9858
E: [email protected]
5. Commissioning
Start by check that the system has been installed in
accordance with this manual.
Disconnect the supply pipe from the inlet to the MiniPurge
system and blow it through for at least 10 seconds per meter
(3ft) of length to remove any debris or condensation.
Connect a temporary pressure gauge or water manometer to
the PE or MiniPurge
system pressure test point (Remove the
red plug on the low pressure sensor and connect 4mm OD
nylon tube).
Figure 11. PE or MiniPurge
system pressure test point
Unless a supply shut-off valve has been specially fitted inside the MiniPurge
system, it may be
advisable to install an external shutoff valve with the same, or larger, thread size as the
MiniPurge
CU inlet fitting upstream of the connection.
5.1 Continuous Flow (CF) Systems
Open the Flow Control Valve (FCV) until the alarm/pressurized indicator just turns from red to
green. Clockwise will reduce the flow and anti-clockwise will increase the airflow.
If the FCV is opened fully and the indicator has still not turned green, check the air supply
pressure
at the inlet to the control unit while flow is taking place
. It must be above the
minimum 4 bar/ 60 psig/ 400kPa specified.
Check that the internal logic gauge reads 2bar /30 psig/200kPa.
The purge timer will start as soon as the ‘alarm/pressurized’
indicator turns from red (alarm) to green (pressurized). Check that
the time delay between the indicator turning green and the
application of power to the PE is not less than the minimum time
required to purge the PE. When the purge time has been
completed, the ‘purge complete’ indicator will turn from red to
green.
After the power has been turned on by the CU, the air flow will
continue at the same rate to provide dilution as required.
Figure 12. Flow Control Valve (FCV)
