OAU-SVX01H-EN
65
Alarms and Troubleshooting
Microprocessor Control
The Main Unit Display and RTRM have the ability to
provide the service personnel with some unit diagnostics
and system status information.
1. Verify that the Liteport LED on the RTRM is burning
continuously. If the LED is lit, go to
.
2. If the LED is not lit, verify that 24 Vac is presence
between J1-1 and J1-2. If 24 Vac is present, proceed to
. If 24 Vac is not present, check the unit main
power supply, check transformer (TNS1). Proceed to
if necessary.
3. Utilizing “Method 1” in the RTRM “System Status
Checkout Procedure”, check the following:
•
System status
•
Cooling status
If a System failure is indicated, proceed to
. If no
failures are indicated, proceed to
4. If a System failure is indicated, recheck
, and 24 Vac is present in
, the RTRM has failed. Replace the RTRM.
5. If no failures are indicated, use one of the override
options to start the unit. Following the Override
procedure will allow you to check all of the operating
modes, and all of the external controls (relays,
contactors, etc.) for each respective mode.
6. Refer to the sequence of operations for each mode, to
assist in verifying proper operation. Make the
necessary repairs and proceed to
7. If no abnormal operating conditions appear in the
Override mode, release the override and turn the
power “Off” at the main power disconnect switch.
System Alarms
The Main Unit Display has built in alarms to help the
operator troubleshoot system failures. This section will
describe these alarms and provide a guide to
troubleshooting the all unit operating modes.
Comprehensive system alarms and diagnostics are
accessed through the Alarms icon at the unit display
discussed later in the section, or through Tracer TU
programming on connected computer. Sensor failures
may be viewed through the Alarms icon.
If an alarm is present, the main indicator light on the
UC600 will blink red. If the optional unit display is installed,
the Alarm icon on the display will register ALARM,
illuminate red and flash.
Important:
The space temperature sensor (SPTC) and
space relative humidity sensor (SPHC) will
read failed if they are not connected; they
will Alarm as “In Fault.”
Sensor Failure Alarm Display
Press the Alarm button on the Home display of the Unit
Display to display system sensor status as described in
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.
