Doc No. 700070 Page 39 of 56
3.9.10 When the branch has been running for 30 minutes,
disconnect the 0-10V input to the dampers and check the
end vent vacuum reading at the burner
FURTHEST AWAY
.
3.9.11 Adjust the branch damper by engaging the manual
overide and rotating the damper spindle until the high fire
end vent suction is achieved (details of which are given in
table 12). Once the high fire is set, lock the maximum stop
in place.
3.9.12 Adjust the branch damper again until the low fire end
vent suction is achieved (details of which are given in table
12). Once the low fire is set, lock the minimum stop in place.
Modulation adjustment instruction for branch damper.
1. Engage manual overide by pushing in black button (A).
2. Rotate spindle to achieve correct suction (B).
3. Lock stop in place (C) to secure damper position.
4. Repeat for low fire. Min stop not shown in photo
5. Check correct rotation is selected (D)
3.9.13 Proceed to the next radiant branch closer to the fan
and commission in the same manner, observing the ignition
sequence of the burners and amber neon’s.
3.9.14 Check the end vent vacuum readings, adjusting
where neccessary.
3.9.15 Repeat procedure above for any further branches
(where necessary), moving closer to the fan as each branch
is completed.
3.9.16 Re-connect the 0-10Vdc input to the dampers.
The vacuum setting procedure is now complete.
3.10 Non-Inverter Driven Fans, Modulating
Fan Damper (System modulation)
(fans controlled by NRV ‘logic’ driven LRU’s with no inverter)
End vent vacuum settings are made firstly by means of
adjusting the damper at the vacuum fan inlet, this brings
the end vent with the lowest reading to the normal
operating vacuum.
Modulation is then achieved by adjusting this damper via a
0-10Vdc input to the damper motor via an external control.
Ensure that all dampers are locked after adjustment.
Ensure that each burner is electrically disconnected at the
end vent module plug/socket.
3.10.1 Check vacuum fan inlet and branch dampers are fully
open in the first instance and secure.
3.10.2 Ensure the controller is in a programmed ON and
above the actual room temperature.
3.10.3 After a 30s delay the fan should run. disconnect the
0-10V input to the panel.
3.10.4 Working at the end vent burner
FURTHEST AWAY
from the fan, measure the vacuum pressure and adjust
the fan inlet damper by engaging the manual overide and
rotating the damper spindle until the high fire end vent
suction is achieved (details of which are given in the
following table). Once the high fire is set, lock the maximum
stop in place.
3.10.5 Adjust the fan inlet damper again until the low fire
end vent suction is achieved (details of which are given in
table 12). Once the low fire is set, lock the minimum stop in
place.
Modulation adjustment instruction for branch damper.
1. Engage manual overide by pushing in black button (A).
2. Rotate spindle to achieve correct suction (B).
3. Lock stop in place (C) to secure damper position.
4. Repeat for low fire. Min stop not shown in photo.
5. Check correct rotation is selected (D)
B
A
C
D
B
A
C
D
