Alarms and Troubleshooting
OAU-SVX005C-EN
55
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 OAG Unit Flame Relays >
400 MBh
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.
AVERTISSEMENT
Procédures d’entretien dangereuses!
Le non-respect de toutes les précautions contenues
dans ce manuel ainsi que sur les étiquettes et les
autocollants peut entraîner des blessures graves voire
mortelles.
Les techniciens, afin d’être protégés des éventuels
risques électriques, mécaniques et chimiques,
DOIVENT suivre les précautions contenues dans ce
manuel, sur les étiquettes et les autocollants, ainsi que
les instructions suivantes : Sauf indication contraire,
coupez toute l’alimentation électrique y compris les
disjoncteurs à distance et déchargez tous les dispositifs
de stockage d’énergie comme les condensateurs avant
l’entretien. Respectez les procédures de verrouillage et
d’étiquetage appropriées pour éviter tout risque de
remise sous tension accidentelle. S’il est nécessaire de
travailler avec des composants électriques sous
tension, demandez à un électricien qualifié et agréé ou
à une autre personne ayant la formation nécessaire
pour manipuler des composants électriques sous
tension d’exécuter ces tâches.
Table 20. Troubleshooting guide for flame relays during problem of safety shutdown (lockout)
Occurs In
Occurs If
Initiate Period
• Purge card is not installed or removed
• Purge card is bad
• Configuration jumpers have been changed (after 200 hours)
• AC line power errors occurred
• Four minute INITIATE period has been exceeded
Standby Period
• Airflow lockout feature is enabled and the airflow switch does not close after ten seconds or within the
specified purge card timing
• Flame signal is detected after 30 seconds
• Ignition/pilot valve/intermittent pilot valve terminal is energized
• Main valve terminal is energized
• Delayed (2
nd
stage) main valve terminal is energized (RM7895C, D/EC7895C, RM7896C/D)
• Internal system fault occurred
• Purge card is removed
• Purge card is bad
