Carrier 30GTR Specifications Page 49
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- TROUBLESHOOTING
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Table 27 — Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERAED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
112 Alert Circuit A High Suction
Superheat
If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem-
perature is less than MOP
for 5 minutes
Circuit A shutdown
after pumpdown
complete.
Manual Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T7) or cooler
thermistor (T5).
113 Alert Circuit B High Suction
Superheat
If EXV is greater than
98%, suction superheat is
greater than 75 F (41.7 C)
and saturated suction tem-
perature is less than MOP
for 5 minutes
Circuit B shutdown
after pumpdown
complete.
Manual Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T8) or cooler
thermistor (T6).
114 Alert Circuit A Low Suction
Superheat
If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
Circuit A shutdown
after pumpdown
complete.
Automatic restart
after first daily
occurrence. Manual
restart thereafter.
Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T7) or cooler ther-
mistor (T5).
115 Alert Circuit B Low Suction
Superheat
If EXV is greater than
10%, and either suction
superheat is less than
19 F (10.6 C) or saturated
suction temperature is
greater than MOP for
5 minutes
Circuit B shutdown
after pumpdown
complete.
Automatic restart
after first daily
occurrence. Manual
restart thereafter.
Faulty expansion valve
or EXV board, faulty
suction gas thermistor
(T8) or cooler ther-
mistor (T6).
116 Alert Circuit A Low Cooler
Suction Temperature
1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
1. Mode 7 initiated.
No additional
capacity in-
creases. Alert
not tripped.
2. Circuit shutdown
without going
through pump-
down.
1. Automatic reset
if corrected.
2. Manual
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T7) or cooler
thermistor (T5), low
cooler fluid flow.
117 Alert Circuit B Low Cooler
Suction Temperature
1. If the saturated suction
temperature is 24 to
29° F (13.3 to 16.1° C)
below cooler LWT and
is also 2° F (1.1° C)
less than freeze*
2. If the saturated suction
temperature is 30° F
(16.7° C) below cooler
LWT and is also 2° F
(1.1° C) less than
freeze* for 10 minutes
1. Mode 8 initiated.
No additional
capacity in-
creases. Alert
not tripped.
2. Circuit shutdown
without going
through pump-
down.
1. Automatic reset
if corrected.
2. Manual
Faulty expansion valve
or EXV board, low re-
frigerant charge,
plugged filter drier,
faulty suction gas ther-
mistor (T8) or cooler
thermistor (T6), low
cooler fluid flow.
118 Alert Circuit A Low Oil
Pressure
Oil pressure switch open
after 1 minute of continu-
ous operation
Circuit shutdown
without going
through pumpdown.
Manual Oil pump failure, low
oil level, switch failure
or compressor circuit
breaker tripped.
119 Alert Circuit B Low Oil
Pressure
Oil pressure switch open
after 1 minute of continu-
ous operation
Circuit shutdown
without going
through pumpdown.
Manual Oil pump failure, low
oil level, switch failure
or compressor circuit
breaker tripped.
LEGEND
CCN — Carrier Comfort Network
CPCS — Compressor Protection Control System
CXB — Compressor Expansion Board
EMM — Energy Management Module
EXV — Electronic Expansion Valve
FSM — Flotronic™ System Manager
MBB — Main Base Board
MOP — Maximum Operating Pressure
WSM — Water System Manager
*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 −8° F (4.4 C) for single set point and lower of CSP.1/CSP.2
−8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:
1 Zero compressors in a circuit
2 Four compressors in a circuit with two unloaders
3
Four compressors in a circuit with one unloader and hot gas
bypass
4 Two unloaders and hot gas bypass in a circuit.
5 More than one compressor quantity difference between circuits
6 Fluid type of low temperature brine
7
Air cooled head pressure control with common fan staging and
different head pressure control methods for each circuit.
49
- Service, and Troubleshooting 1
- CONTENTS (cont) 2
- INTRODUCTION 2
- LEGEND FOR FIG. 1-4 5
- Fig. 5 — Main Base Board 10
- OPERATING DATA 11
- Sensors — 11
- CEPL130351-01 17
- Head Pressure Control 27
- Tables 6-24) — 29
- Table 22 — Operating Modes 42
- MAX. ALLOWABLE LOAD (%) 46
- (For Thermistors T1-T9) 59
- (For Thermistor T10) 61
- *Lead compressor only 64
- START-UP AND OPERATION 65
- Operating Limitations 65
- APPENDIX A — CCN TABLES 67
- OPTIONS (Unit Parameters) 71
- STRTHOUR 72
- CURRMODS 73
- SETPOINT 73
- LID DEFAULT SCREEN DEFINITION 73
- TABLE TYPE 19 HEX 73
- (Remove and use for job file) 77
- A. Preliminary Information 77
- C. Unit Start-Up (cont) 79
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