Chapter 3.
ADJUSTMENTS FOR TRIAL
OPERATION
22
■
Outline
The following table shows the test adjustment items described in this chapter:
Handling Precautions
•
After adjusting the above items, make sure that all of the adjustment
requirements are satisfied. All of the adjustment requirements must be
satisfied by the final mounting position of the flame detector.
●
Required equipment
• Tester (input impedance, 100 k
Ω
or more)
Range: 0 to 300 Vac, 0 to 5 Vdc
• Two jumper leads with crocodile clips, AWG14 (2 mm
2
) or more, approximate-
ly 30 cm long.
• Insulation tester: 500 Vdc megger
●
Preliminary inspection
• Check all connections.
• Make sure that the controller is mounted at a location within the allowable ambi-
ent temperature.
WARNING
Do not allow the pilot or main burner "Safety Time" (ignition trial time) to
exceed the specifications of the burner or equipment manufacturer. If they do,
fuel may accumulate in the combustion chamber and form an explosive air-
fuel mixture, resulting in a serious explosion hazard.
Even after the power to this device is turned off, terminal F continues to hold
an electrical charge. To avoid electrical shock, do not touch terminal F.
Before the pilot turndown test or ignition spark response test, make sure that
all manual fuel valves are closed.
Do not start regular operation of the equipment without first completing the
trial-run adjustments for this device, as well as the tests specified by the
equipment manufacturer.
CAUTION
Installation, wiring, inspection, adjustment, etc. should be carried out by a
trained and experienced technician who has knowledge and technical skills
related to combustion equipment and flame safeguard control devices.
Check the flame current at least once per month. Doing so can prevent
shutdowns caused by a weak flame current signal.
Item
Applicable Unit
Flame signal measurement method
All units
Pilot turndown test
Units using the pilot burner
Ignition spark response test
All units
Safety shutdown test
All units
