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AUXIis notblinking, check t heDIPswitch p ositions onthe
board, If theredLEDs arenotblinking i n unison, verify that
correct power is being supplied toallmodules,
A blinking r ed
LEDattherate ofonce persecond means that s oftware is not
loaded onthe board, Also, besure t hat t he board i ssupplied
with
the current software,
If necessary,
reload current software,
Aboard
LED that islit continuously
should bereplaced,
Green
LED
The MBB,
ECB and AUX1 each have one green LED,
The Local
Equipment
Network
(LEN)
LED
should
always
be
blinking
whenever
power
is on, If LEN
LED
is not blinking,
check
LEN
connections
for potential
communication
errors (MBB
J3, J4, and
J5), Communication
between
modules
is accomplished
by a 3-wire
sensor bus, These 3 wires run in parallel
from module
to module,
The J4 connector
on the
MBB
also provides
both
power
and
communication
directly
to the Scrolling
Marquee
display,
The J5
connector
on the MBB provides
a LEN interface at the field
connection ternfinal (TB).
Yellow
LED
The MBB
has one yellow
LED
which
is used to indicate
CCN
communication
activity.
The Carrier
Comfort
Network@
(CCN)
LED will blink during
times of network
communication.
Communication
Failures
If the Scrolling Marquee or Navigator display Conmmnication
Failure or the green or yellow LED's do not flash on the boards
then the problem could be the communication chip on one of the
control boards (MBB, ECB or AUX1).
Use an ohm meter to
measure the resistance on the communication pins of the boards to
determine if the board is bad.
If the reading is less than half the
value indicated in Table 7, then the board needs to be replaced.
Table
7 1
LEN
and CCN
Communication
Resistances
Device
(CCN) Resistance between Pins/
Board Serial
Number
Prior to 4702N
Starting 4702N
Prior to 0803N
Starting 0803N
(LEN) Resistance between Pins/
Connector
Pins 5 to 6
7.5K Q
J5
9.9K £-2
J5
Connector
Pins 1 to 2
7.5K _2
J3, J4, & J5
9.9K £-2
J3, J4, & J5
5.2K £-._
J2
9.9K Q
J2
16K Q
J9
Pins 1 to 3
Pins 2 to 3
Pins 5 to 7
Pins 6 to 7
15K C_
7.5K C_
15K C_
7.5K C_
J3, J4, & J5
J3, J4, & J5
J5
J5
MBB
18.9K Q
9.9K Q
18.9K Q
9.9K Q
J3, J4, & J5
J3, J4, & J5
J5
J5
5.9K 0
5K 0
J2
J2
ECB
18.9K Q
9.9K 0
J2
J2
29K 0
13.5K Q
AUX1
J9
J9
-
-
-
IMPORTANT:
The resistive
values should be read when the board is powered
off and the unit is locked out.
Alarms
and Alerts
Viewing and Clearing
Unit
Alarms
Presence
of
active
alarms
will
be
indicated
on the
Scrolling
Marquee
display
by the Alarm Status
light turning on and by the
number
of active alarms being
displayed
in the automatic View of
Run Status. Presence
of active alarms may also be signaled
on the
Alarm Output
terminals.
Each alarm may also be broadcast
on the
CCN
network.
Active
alarms
and past
alarm
history
can
be
reviewed
and cleared via the local display
or a CCN device.
The
following
menu locations
are used for the local display:
Alarms-->R.CURR
(Reset All Current
Alarms)
Change
to YES to reset all active alarms. Turning
unit power
off
will also reset all current
alarms.
Alarms-->R.HIST
(Reset Alarm
History)
Change
to YES to reset the alarm history.
Turning
unit power
off
will not reset the alarm history.
Alarms-->CURR
(Currently
Active Alarms)
Use the ENTER
key, then scroll through any alarm numbers
using
the up and down
arrow keys. Alarms
are displayed
in numerical
order.
Alarms-->HIST
(Alarm
History)
Use the ENTER
key, then scroll through any alarm numbers
using
the up and down
arrow
keys.
Up to 20 alarms are displayed
in
order of occurrence,
with time and date.
The description
for an alarm
can be viewed
on the
Scrolling
Marquee
display
by
pressing
ESCAPE
and
ENTER
keys
sinmltaneously
while displaying
the alarm code number.
Be sure to
expand
description
for each code, because
in some cases there are
different
possible
descriptions
and
causes
for
the
same
code
number.
Diagnostic
Alarm
Codes
and
Possible
Causes
Alert Code T051
There
are 5 different
texts for this alert code.
There
are three
different
alerts, two of which
have corresponding
test mode
alerts
indicated
with "Service
Test" in the expanded
text.
Pressing enter
and esc on the marquee
or navigator
to expand
the T051
alert will
show you one of the below
alerts. Make sure the expanded
text is
read correctly before
troubleshooting.
• Digital Compressor
Control
Board Alarm
This alert occurs when the Digital
Scroll Controller
(DSC)
energizes
its alarm relay.
Refer to the DSC's
LED diagnostic
to
determine
which of the nine codes are present.
Power cycle will
clear the DSC's
LED code.
When the DSC's
alarm clears, this
alert will automatically
clear.
• Compressor
AI Safety Trip
This Alert indicates
that Current
Sensing
AI (CS.AI)
has been
enabled.
The unit does not support
the use of a current sensor at
this time.
Change
the CS.A1 to disable and this alert will clear
and not return.
(Configuration-+COOL
-+CS.41)
• Compressor
AI Current
Detected
After Turnoff
This Alert indicates
that Current
Sensing
A1 (CS.A1)
has been
enabled.
The unit does not support
the use of a current sensor at
this time.
Change
the CS.AI
to disable and this alert will clear
and not return.
(Con figuration--,COOL--,CS.41)
Alert Code T064 - Circuit
A Saturated
Condensing
Temperature
Thermistor
Failure
This alert occurs
when the temperature is outside
the range -40 ° to
240°F
(-40 ° to 116°C).
When
this occurs,
the control
will use
25
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Table of Contents
Troubleshooting
