W
innox · Edition 12.20
EN-9
step 6 - Verify settings
1
With burner lit, drive control motor to high fire.
2
Wait for the chamber to reach normal operating conditions (e.g.
chamber temperature, process flows, etc.).
3
Measure high fire fuel using fuel flow measurement device. Com-
pare this to the rated high fire which can be found in the page
10 (Technical data).
4
Measure high fire air differential pressure between Tap
C
and the
chamber.
To chamber
Manometer
Tap C
Verify pressure settings
5
Compare this pressure to the chart: page 13 (Air ΔP vs. Input).
6
Drive the control motor to low fire and verify low fire flame signal
and flame appearance (if viewing).
7
Cycle burner from high to low several times to check repeatabil-
ity of settings.
8
Readjust burner if the settings do not repeat as expected. If nec-
essary, refer to page 10 (Assistance in the event of malfunction).
9
Use the System Schematics, see Technical Information Winnox,
to record all setup data as an aid for future troubleshooting and
setup operations.
CAUtIon
– Do not turn the combustion air blower off until the chamber
temperature is below 250°F (121°C). This will prevent hot
gases from back flowing into the burner and blower causing
damage to the burner.
10
Stop the burner.
MAIntenAnCe
Preventive maintenance is the key to a reliable, safe and efficient
system. The core of any preventive maintenance system is a list of
periodic tasks. The following are suggestions for a monthly list and
a yearly list.
➔
The monthly list and yearly lists are an average interval. If your
environment is dirty, the intervals may be shorter.
Monthly checklist
1
Inspect flame-sensing devices for good condition and cleanliness.
2
Check for proper inlet air/gas ratios.
3
Test all the alarm systems for proper signals.
4
Check ignition spark plugs and proper gap.
5
Check valve motors and control valves for free, smooth action
and adjustment.
6
Check for proper operation of the ventilating equipment.
7
Test the interlock sequence of all safety equipment; manually
make each interlock fail, noting that related equipment closes or
stops as specified by the manufacturer.
8
Test flame monitoring control system by manually shutting off gas
to burner.
9
Test main fuel hand-valves for operation.
10
Clean or replace the combustion air blower filter.
11
Inspect and clean the combustion air blower rotor.
Yearly checklist
1
Test (leak test) safety shut-off valves for tightness of closure.
2
Test air pressure switch settings by checking switch movements
against pressure settings and comparing with actual impulse
pressure.
3
Visually check ignition cable and connectors.
4
Inspect impulse piping for leaks.
5
Clean and inspect all the burners.
6
Make sure that the following components are not damaged or
distorted:
– burner nozzle
– spark plugs
– flame sensors
– flame tube or combustion block
7
If applicable, remove and clean all the orifice plates.
Burner nozzle
A
B
Component inspection
The nozzle can be inspected without removing the burner from the
chamber wall or entering the chamber. See the figures and perform
the following:
1
Shut the burner off and manually close the main gas shut off
cocks.
2
Allow the chamber temperature to cool down to 250°F (121°C).
3
Disconnect the gas piping at a union or the gas inlet flange
A
provided on the burner.
4
Remove the four bolts
B
.
CAUtIon
– Do not attempt to remove the rear cover by removing the inner
circle bolts
e
. Internal burner parts will be damaged.
5
Remove bolts
F
.
6
Remove the rear cover / nozzle assembly
C
from the burner
housing
D
.
7
To reassemble, follow this sequence in the reverse order.
note:
The combustor can be inspected only by removing the burner
from the chamber wall or entering the chamber.
C
D
E
F
Nozzle inspection
