bonitron M3345, Reference Manual

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User’s Manual
21
5. M
AINTENANCE AND
T
ROUBLESHOOTING
Repairs or modifications to this equipment are to be performed by Bonitron approved
personnel only. Any repair or modification to this equipment by personnel not approved
by Bonitron will void any warranty remaining on this unit.
5.1.
P
ERIODIC
T
ESTING
There are no requirements for periodic testing of these units. It may be beneficial to
repeat start-up procedures and checks when performing routine maintenance.
5.2.
M
AINTENANCE
I
TEMS
Check the fan periodically for debris, and blow out with an air hose if it has become
obstructed or not running at full capacity.
Power should not be applied when
blowing dust and debris out of unit
.
5.3.
T
ROUBLESHOOTING
CAUTION!
There are no user serviceable parts within the M3345 Regen unit. If you
are still experiencing problems after you have reviewed this whole Section
you may contact Bonitron for additional assistance at (615) 244-2825.
The 3345C2 Control Board has 3 LEDs which may be useful in diagnosing problems
with the unit or system. The cover may need to be removed in order to access the
control board.
Do not remove any covers with power applied to the unit!
Refer
to Figure 3-12 for location of the LEDs on the circuit board. Following is a brief
description of the LEDs and indications:
5.3.1.
POWER
LAMP IS OUT
:
•
Check AC input voltage at fuses
•
Check voltage at output side of fuses
•
Check connection to lamp from PCB
5.3.2.
RUN
LIGHT IS OUT
The
RUN
LED indicates that the module is enabled and in a ready
condition. This LED is directly related to the status contact at the I/O
terminal. If the
RUN
LED is ON the status contact should be closed. If the
LED is ON and the status contact does not change there is most likely a
wiring issue. When the power is applied to the module, the
RUN
LED will
normally come ON after a startup delay of approximately 2 seconds.
Thereafter, the
RUN
LED should be ON, indicating that the system is ready
to operate. If the
RUN
LED fails to come ON, one of several faults may be
indicated.
•
If the
OVERLOAD
LED is lit or briefly comes on other than at power-
up, refer to Section 5.3.6.
•
If no LEDs are lit, remove power and unplug TB2 and measure
continuity of the purple and purple/tr wires on the connector. This
should be 0 ohms. If connection measures open, the thermostat is
either indicating high temperature or is defective. Switch opens at
175°F and closes at 140°F on all chassis EXCEPT the Y chassis