Troubleshooting - Honeywell C7024E User Manual

C7024E,F
ADJUSTMENTS AND CHECKOUT • TROUBLESHOOTING
Flame Detector
a
C7024E,F
a
Shutter operation of the C7024E,F causes fluctuations in the readings. Read the average stable current or voltage
disregarding the peaks.
b
This minimum or greater signal should be obtained if the detector is correctly installed and positioned to properly
sense flame. This current or voltage must be obtained before completing the checkout.
RESPONSE TO OTHER ULTRAVIOLET
RADIATION SOURCES
Some sources of artificial light produce small amounts
of ultraviolet radiation. Under certain conditions, an
ultraviolet detector will respond to them as if it is sens-
ing a flame. Do not use an artificial light source to check
the response of an ultraviolet flame detector. To check
for proper detector operation, conduct Flame Failure
Response Tests under all operating conditions.
WELD THE SIGHT PIPE
When all adjustments have been made and the flame
signal is acceptable, remove the detector and weld the sight
pipe in its final position. (If you are using a swivel mount, the
pipe may already be welded.) Then reinstall the detector.
!
CAUTION
1. Be extremely careful when troubleshooting
the detector; voltages are preset on some of
the terminals when power is on.
2. Open the master switch to disconnect power
before removing or installing the detector
or its cover. More than one disconnect may
be involved.
EQUIPMENT REQUIRED
For 7800 SERIES Controls, an ohm/volt meter with a
minimum sensitivity of 20,000 ohms/volt and a zero to
five or ten Vdc scale is suggested. When the Keyboard
Display Module is included with the control, flame
signal will be displayed on the module.
For replacement parts, see the Specifications section.
UV SENSOR TUBE TEST
See Adjustments and Checkout section.
UNSATISFACTORY FLAME SIGNAL
If a satisfactory flame signal (see Table 1) cannot
be obtained while adjusting the sighting position of
65-0156—1
TABLE 1—FLAME SIGNAL.
Plug-in Flame Flame Safeguard
Signal Amplifier
R7824C Dynamic
Self-Check
Minimuma
Acceptable Steady
Control Voltage (Vdc)
RM7824 1.25
FINAL CHECKOUT
Before putting the burner into service, check out the
installation using the checkout procedures for the appro-
priate Flame Safeguard control. After completing the
checkout, run the burner through at least one complete
cycle to verify correct operation.
!
CAUTION
Do not put the system into operation until all
checkout tests in the instructions for the appro-
priate flame safeguard control, and any others
specified in the burner installation instructions,
are completed satisfactorily.

Troubleshooting

the detector, follow these procedures. If you encounter
other problems in the system, refer to the Trouble-
shooting section in the instructions for the appropriate
flame safeguard control.
NOTE: For instructions for replacing the viewing win-
dow, sensing tube, and coil and shutter assembly, see
the Service section.
TROUBLESHOOTING PROCEDURES
First perform the Preliminary Inspection, then follow
the applicable procedures for either a low reading or a
zero reading on the meter. After reinstalling the detector
or replacing its cover, recheck the meter reading. Adjust
the position of the detector to try to obtain the proper
flame signal. If you complete all of the procedures and
still can-not obtain a proper flame signal, replace the
detector.
Preliminary Inspection
1. Check for 24 Vdc input voltage. Make sure the
master switch is closed, connections are correct and
power supply voltage is correct.
10
Maximum
Expected Voltage
(Vdc)
b
5.0