Wohler DM 2000 Notice D'utilisation page 15

Procedure for Taking
Flue Draft Readings
The typical procedure when using a Wohler me-
chanical draft gauge is as follows:
1. Visually inspect the draft gauge for signs of
damage and/or defect.
2. Ignite a small amount of fuel in the appliance
and leave to burn for 20 minutes.
3. Turn on the unit and allow the display to stabi-
lise and settle to zero.
4. Connect the rubber hose to the negative con-
nector on the unit.
5. Connect the stainless steel probe to the end of
the rubber hose.
6. Insert metal sampling tube into test point pre-
venting secondary air entry.
7. Wait approximately 30 seconds for stabilisation
and then take a draught reading.
NOTE!
Atmospheric or weather conditions may cause in-
correct draft readings.
Depending upon the draft reading obtained, it may
be necessary to adjust the appliance air control
devices and/or the flue draft stabiliser (if fitted).
Any adjustment should be made in accordance
with the manufacturer's instructions and the
draught reading should be retaken after each ad-
justment.
If acceptable draft conditions are not able to be
achieved, the appliance should be taken out of
service and where appropriate the HETAS Unsafe
Situations Procedure should be followed whilst the
fault is rectified. Refer to Unit HTU03K Section 8
for more details.
Flue Draft Test
15