Biddle HR 25 - Page 30

INSTALLATION HEAT RECOVERY UNIT
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3. Make a bridge between the two switch contacts (NO/
NC).
Caution:
c Do not allow the bridge to remain for longer than 1
minute. Check the input value (step 4) within that
time. If this takes longer, the unit must be powered
down to reset the pressure switch.
4. Check that the value of the fourth input (1-2-3-4) a one
is: x-x-x-1
5. Remove the bridge.
2. Open the indicated panels to check the
operation of the
dampers and f
ans.
3. Connect a pressure difference meter over the extrac
t fan
2.
4.
Check the operation of differ
ent fans and dampers in each
t
est mode. Use the table below for this purpose.
Note:
n The extract fan 2 and the exhaust air damper 4 are
not visible. Check this with reference to the
pressure difference over the extract fan.
In the final test mode (7), the fan runs but there is
no pressure difference because the air damper is
closed.
Note:
n The opening and closing of the dampers can take a
little while.