Doc No. 700070 Page 35 of 56
3.4.19 Rotate jog dial until ‘HSP’ is displayed. Press jog dial
to enter.
3.4.20 Rotate jog dial to adjust the frequency on the
inverter until the high fire end vent suction is achieved
(details of which are given in table 12). Press jog dial to enter
new value.
3.4.21 Remove heat demand from system.
3.4.22 Rotate jog dial until ‘LSP’ is displayed. Press jog dial
to enter.
3.4.23 Rotate jog dial to adjust the frequency on the
inverter until the low fire end vent suction is achieved.
3.4.24 Return heat demand to system.
3.4.25 Proceed to the next radiant branch closer to the fan
and check the end vent vacuum reading at high and low
fire.
3.4.26 Adjust the branch damper (if necessary) located at
the end of the branch to bring the vacuum readings in line
with the normal operating figure shown in table 12. Ensure
the damper is locked securely after adjustment.
Adjustment instruction for branch damper.
1. Loosen grub screw (A).
2. Turn adjustment lever (B).
3. Position of damper blade is indicated by position of bent
adjustment lever.
4. Tighten grub screw (A) to secure damper position.
3.4.27 Repeat procedure 3.4.26 for any further branches
(where necessary), moving closer to the fan as each branch
is completed.
The vacuum setting procedure is now complete.
3.5 Schneider Inverter Driven B80, B160,
B300 Fan, Modulating Branch Damper (Zonal
modulation)
In this method, the fan is driven by the inverter and
adjusted to give the correct output for full fire.
Modulation is achieved by adjusting each branch damper
via a 0-10Vdc input to the damper motor via an external
control.
3.5.1 Ensure that electrical supplies to the end vent modules
and burners in each branch are connected.
3.5.2 Check that the fan and branch dampers are fully open
and secure.
3.5.3 Ensure the controller is in a programmed ON function
and above the actual room temperature.
3.5.4 After a 30s delay the fan should run and the inverter
should be showing the motor frequency in the display.
3.5.5 Press the mode button 3 times until ‘ConF’ appears on
the display.
3.5.6 Press the jog dial to enter. Rotate jog dial until ‘LSP’ is
displayed. Press jog dial to enter.
3.5.7 Rotate jog dial to adjust frequency. Press jog dial to
enter new value, causing the inverter to change its speed.
3.5.8 Adjust the frequency until each burner has lit.
Frequency is usually between 35 and 50 (Hz)
3.5.9 Press the ESC button twice to return the inverter to the
’rdY’ display.
3.5.10 Remove power to the system and allow fan to halt.
3.5.11 Return power to system. After a 30s delay the fan
should run and a red neon should have illuminated on the
rear of each burner.
3.5.12 If the dip-switches have been set correctly, the burner
closest to the manifold (last on branch) should ignite first
followed in order by every burner towards the end vent
burner.
Note: It may be necessary to temporarily break the
union at a burner in order to purge the gas pipe of air.
FOLLOW INSTRUCTIONS ON P39 (3.8) FROM THIS POINT
