Alarms and Troubleshooting
RRU-SVX01F-EN
53
Flame Current Measurement
Flame current of the device can be measured using a
standard micro-ammeter by simply inserting the meter
probes into the holes labeled FLAME CURRENT.
•
Flame current must be measured with pilot valve lit but
no main gas flowing.
•
Disconnect MV leadwire from the control before
measuring flame current.
•
Set meter to DC µAmp scale.
•
Ensure meter leads are positioned correctly [+/-].
Note:
Trying to measure the pilot flame current in series
with the wiring will not be accurate.
Recommended Minimum Pilot Only Flame Current:
•
Must read steady 1 µAmp DC minimum.
•
Flame current should be 2 µAmp or greater for reliable
appliance operation.
Direct-Fired Unit Flame Relays > 400 MBh
Table 14. Lockout models B, H D, and J only—Green LED status codes
Green LED Flash
Code
(a)
Indicates
Next System Action
Recommended Service Action
OFF
No “Call for Heat”
Not applicable
None
Flash Fast
Power up - internal check Not applicable
None
Heartbeat
Normal startup - ignition
sequence started
(including prepurge)
Not applicable
None
4 Seconds ON
then “x” flashes
Device in run mode.
“x” = flame current to the
nearest
μ
A.
Not applicable
None
2
Lockout - Failed trial for
ignition
Remain in lockout until “Call for Heat” is cycled.
Check gas supply, pilot burner, spark and flame
sense wiring, flame rod contaminated or out of
position, burner ground connection.
3
Recycle
- Flame failed during run
Initiate new trial for ignition. Flash code will remain
through the ignition trial until flame is proved.
If system fails to light on next trial for ignition,
check gas supply, pilot burner, flame sense
wiring, contamination of flame rod, burner
ground connection.
4
Flame sensed out of
sequence
If situation self corrects within 10 seconds, control
returns to normal sequence. If flame out of
sequence remains longer than 10 seconds, control
will resume normal operation 1 hour after error is
corrected.
Check for pilot flame. Replace gas valve if pilot
flame present. If no pilot flame, cycle “Call for
Heat.” If error repeats, replace control.
6
Control Internal Error
Control remains in wait mode. When the fault
corrects, control resumes normal operation.
Cycle “Call for Heat”. If error repeats, replace
control.
7
Flame rod shorted to
ground
Control remains in wait mode. When the fault
corrects, control resumes normal operation.
Check flame sense lead wire for damage or
shorting. Check that flame rod is in proper
position.Check flame rod ceramic for cracks,
damage or tracking.
8
Low secondary voltage
supply
Control remains in wait mode. When the fault
corrects, control resumes normal operation.
Check transformer and AC line for proper input
voltage to the control. Check with full system
load on the transformer.
(a) Flash Code Descriptions:
- Flash Fast: Rapid blinking.
- Heartbeat: Constant 1/2 second bright, 1/2 second dim cycles.
- 4 second solid on pulse followed by “x” 1 second flashes indicates flame current to the nearest
μ
A. This is only available in run mode.
- A single flash code number signifies that the LED flashes X times at 2 Hz, remains off for two seconds, and then repeats the sequence.
WARNING
Hazardous Service Procedures!
Failure to follow all precautions in this manual and on
the tags, stickers, and labels could result in death or
serious injury.
Technicians, in order to protect themselves from
potential electrical, mechanical, and chemical hazards,
MUST follow precautions in this manual and on the
tags, stickers, and labels, as well as the following
instructions: Unless specified otherwise, disconnect all
electrical power including remote disconnect and
discharge all energy storing devices such as capacitors
before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be
inadvertently energized. When necessary to work with
live electrical components, have a qualified licensed
electrician or other individual who has been trained in
handling live electrical components perform these
tasks.
