Time Guard Display Table; Alarms And Alerts - United Technologies Carrier Weathermaker 48A2 Controls, Start-Up, Operation, Service, And Troubleshooting

ITEM
TMGD TIMEGUARDS
TG.A1 Compressor A1 Timeguard
TG.A2 Compressor A2 Timeguard
TG.B1 Compressor B1 Timeguard
TG.B2 Compressor B2 Timeguard
TG.H1 Heat Relay 1 Timeguard
TG.H2 Heat Relay 2 Timeguard
TG.H3 Heat Relay 3 Timeguard
TG.H4 Heat Relay 4 Timeguard
TG.H5 Heat Relay 5 Timeguard
TG.H6 Heat Relay 6 Timeguard
ITEM
VERS SOFTWARE VERSION NUMBERS
MBB CESR131343-xx-xx
ECB1 CESR131249-xx-xx
ECB2 CESR131465-xx-xx
SCB1 CESR131226-xx-xx
CEM CESR131174-xx-xx
SCB2 CESR131226-xx-xx
RXB CESR131465-xx-xx
EXV CESR131172-xx-xx
VFD
MARQ CESR131171-xx-xx
NAVI CESR130227-xx-xx
Alarms and Alerts —
alerts and alarms in the system.
• P — Pre-Alert: Part of the unit is temporarily down. The
alarm is not broadcast on the CCN network. The alarm relay
is not energized. After an allowable number of retries, if the
function does not recover, the pre-alert will be upgraded to
an alert or an alarm.
• T — Alert: Part of the unit is down, but the unit is still
partially able to provide cooling or heating.
• A — Alarm: The unit is down and is unable to provide
cooling or heating.
All alarms are displayed with a code of AXXX where the A
is the category of alarm (Pre-Alert, Alert, or Alarm) and XXX
is the number.
The response of the control system to various alerts and
alarms depends on the seriousness of the particular alert or
alarm. In the mildest case, an alert does not affect the operation
of the unit in any manner. An alert can also cause a "strike." A
"striking" alert will cause the circuit to shut down for 15 min-
utes. This feature reduces the likelihood of false alarms causing
a properly working system to be shut down incorrectly. If three
strikes occur before the circuit has an opportunity to show that
it can function properly, the circuit will strike out, causing the
shutdown alarm for that particular circuit. Once activated, the
shutdown alarm can only be cleared via an alarm reset.
Circuits with strikes are given an opportunity to reset their
strike counter to zero. As discussed above, a strike typically
causes the circuit to shut down. Fifteen minutes later, that
circuit will once again be allowed to run. If the circuit is able to
run for 1 minute, its replacement circuit will be allowed to shut
down (if not required to run to satisfy requested stages). How-
ever, the "troubled" circuit must run continuously for 5 minutes
with no detectable problems before the strike counter is reset to
zero.
All the alarms and alerts are summarized in Table 100.
Table 98 — Time Guard Display Table
EXPANSION
Table 99 — Software Version Numbers Display Table
EXPANSION
There are a variety of different
RANGE UNITS
RANGE UNITS
DIAGNOSTIC ALARM CODES AND POSSIBLE CAUSES
T051, P051 (Circuit A, Compressor 1 Failure)
T052, P052 (Circuit A, Compressor 2 Failure)
T055, P055 (Circuit B, Compressor 1 Failure)
T056, P056 (Circuit B, Compressor 2 Failure) — Alert codes
051, 052, 055, and 056 are for compressors A1, A2, B1, and
B2 respectively. These alerts occur when the current sensor
(CS) does not detect compressor current during compressor
operation. When this occurs, the control turns off the compres-
sor and logs a strike for the respective circuit. These alerts reset
automatically.
If the current sensor board reads OFF while the compressor
relay has been commanded ON for a period of 4 continuous
seconds, an alert is generated.
Any time this alert occurs, a strike will be called out on the
affected compressor. If three successive strikes occur the
compressor will be locked out requiring a manual reset or
power reset of the circuit board. The clearing of strikes during
compressor operation is a combination of 3 complete cycles or
15 continuous minutes of run time operation. So, if there are
one or two strikes on the compressor and three short cycles
(ON-OFF, ON-OFF, ON-OFF) less than 15 minutes each
occur, the strikes will be reset to zero for the affected compres-
sor. Also, if the compressor turns on and runs for 15 minutes
straight with no compressor failure, the compressor's strikes
are cleared as well.
NOTE: Until the compressor is locked out, for the first two
strikes, the alert will not be broadcast to the network, nor will
the alarm relay be closed.
The possible causes are:
• High-pressure switch (HPS) open. The HPS is wired in
series with compressor relays on the MBB. If the high-pres-
sure switch opens during compressor operation, the com-
pressor stops, and the CS no longer detects current, causing
the control to activate this alert.
95
POINT WRITE STATUS
CMPA1_TG
CMPA2_TG
CMPB1_TG
CMPB2_TG
HS1_TG
HS2_TG
HS3_TG
HS4_TG
HS5_TG
HS6_TG
POINT WRITE STATUS
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