95
Table 98 — Time Guard Display Table
Table 99 — Software Version Numbers Display Table
Alarms and Alerts —
There are a variety of different
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.
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.
ITEM
EXPANSION
RANGE
UNITS
POINT
WRITE STATUS
TMGD
TIMEGUARDS
TG.A1
Compressor A1 Timeguard
CMPA1_TG
TG.A2
Compressor A2 Timeguard
CMPA2_TG
TG.B1
Compressor B1 Timeguard
CMPB1_TG
TG.B2
Compressor B2 Timeguard
CMPB2_TG
TG.H1
Heat Relay 1 Timeguard
HS1_TG
TG.H2
Heat Relay 2 Timeguard
HS2_TG
TG.H3
Heat Relay 3 Timeguard
HS3_TG
TG.H4
Heat Relay 4 Timeguard
HS4_TG
TG.H5
Heat Relay 5 Timeguard
HS5_TG
TG.H6
Heat Relay 6 Timeguard
HS6_TG
ITEM
EXPANSION
RANGE
UNITS
POINT
WRITE STATUS
VERS
SOFTWARE VERSION NUMBERS
MBB
CESR131343-xx-xx
string
ECB1
CESR131249-xx-xx
string
ECB2
CESR131465-xx-xx
string
SCB1
CESR131226-xx-xx
string
CEM
CESR131174-xx-xx
string
SCB2
CESR131226-xx-xx
string
RXB
CESR131465-xx-xx
string
EXV
CESR131172-xx-xx
string
VFD
MARQ
CESR131171-xx-xx
string
NAVI
CESR130227-xx-xx
string
Summary of Contents for Carrier Weathermaker 48A2
Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
