Carrier Ecologic 30GX080-265 Controls, Start-Up, Operation, Service, And Troubleshooting page 48

ALARM/ALERT ALARM OR
CODE ALERT
68 Alert
70 Alert
71 Alert
72 Alert
73 Alert
74 Alert
75 Alarm
76 Alarm
77 Alarm
78 Alarm
79 Alarm
80 Alarm
81 Alarm
82 Alarm
LEGEND
CCN — Carrier Comfort Network
CPM — Compressor Protection Module
DGT — Discharge Gas Temperature
EWT — Entering Water Temperature
EXV — Electronic Expansion Valve
FSM — Flotronic™ System Manager
HPS — High-Pressure Switch
LCW — Leaving Chilled Water
LWT — Leaving Water Temperature
MCT SP — Maximum Condensing Temperature Set Point
MTA — Compressor Must Trip Amps
SCT — Saturated Condensing Temperature
SST — Saturated Suction Temperature
W/C — Water-Cooled
WSM — Water System Manager
*Current and voltage imbalance alarms x.25 and x.55 may be changed to
warnings x.27 and x.57 after successful start-up of the chiller.
†Compressors are equipped with 2 motor winding temperature ther-
mistors. Verify first that the problem is not a wiring error before using backup
thermistor.
**Reset automatic first time, manual if repeated on the same date.
††Note that the high-pressure switch should trip before this alert is generated.
Check HPS operation if this alert is generated.
Table 33 — Alarm and Alert Codes (cont)
WHY WAS THIS
DESCRIPTION
ALARM GENERATED?
Circuit B High Dis- SCT > MCT_SP + 5 F
charge Pressure (2.8 C)
High Leaving Chilled LCW read > LCW Delta
Water Temperature Alarm limit and total ca-
pacity is 100% and cur-
rent LCW > LCW
reading 1 minute ago
Circuit A Low Oil Level Level switch input open
for 4th time in same
day.
Circuit B Low Oil Level Level switch input open
for 4th in same day.
Circuit A Low Discharge Superheat <5 F (2.8 C)
Superheat for 10 minutes
Circuit B Low Discharge Superheat <5 F (2.8 C)
Superheat for 10 minutes
Comp. A1 Max. Oil (Discharge press − Oil
Delta P, check oil line press) >100 PSI for
more than 5 seconds
Comp. A2 Max. Oil (Discharge press − Oil
Delta P, check oil line press) >100 PSI for
more than 5 seconds
Comp. B1 Max. Oil (Discharge press − Oil
Delta P, check oil line press) >100 PSI for
more than 5 seconds
Comp. B2 Max. Oil (Discharge press − Oil
Delta P, check oil line press) >100 PSI for
more than 5 seconds
Comp. A1 Failed Oil Diff. Oil pressure
Solenoid >2.5 PSI during period
after oil pump starts and
before oil solenoid opens
Comp. A2 Failed Oil Diff. Oil pressure
Solenoid >2.5 PSI during period
after oil pump starts and
before oil solenoid opens
Comp. B1 Failed Oil Diff. Oil pressure
Solenoid >2.5 PSI during period
after oil pump starts and
before oil solenoid opens
Comp. B2 Failed Oil Diff. Oil pressure
Solenoid >2.5 PSI during period
after oil pump starts and
before oil solenoid opens
ACTION TAKEN
BY CONTROL
Circuit shut down
Alert only. None
Circuit A shut down
Circuit B shut down
Circuit A shut down
Circuit B shut down
Comp. A1 shut down
Comp. A2 shut down
Comp. B1 shut down
Comp. B2 shut down
Comp. A1 not allowed
to start
Comp. A2 not allowed
to start
Comp. B1 not allowed
to start
Comp. B2 not allowed
to start
NOTES:
1. Low Oil Pressure Alert Criteria and Set Points
Where: P d = Discharge pressure, P s = Suction pressure,
P o = Oil pressure and P e = Economizer pressure
Two oil pressure set points are used. Oil Set point 1 is always 15 psig.
a. If (P d − P s ) <125, then Oil Set point 2 = 0.235 x (P d − P s ) + 0.588
b. If (P d − P s ) > = 125 and <165, then Oil Set point 2 = 2.0 x (P d − P s )
− 220.0
c. If (P d − P s ) > = 165, then Oil Set point 2 = 0.6364 x (P d − P s ) + 5.0
The 2 set points are used by the control for the Low Oil Pressure alert trip
criteria below:
a. Oil Pressure is ignored during the first 5 seconds after a compressor is
started.
b. In period between 5 and 30 seconds after starting, the alert will be gen-
erated if (P o − P e ) < [(Oil Set point 1)/30] x (Compressor Run time in
seconds) for 3 consecutive readings
c. After 30 seconds run time, the alert will be generated if:
1) (P o − P e ) < Oil Set point 1 for 15 seconds OR
2) (P o − P s ) < Oil Set point 2 for 25 seconds
2. (P o − P e ) is the Oil pressure differential displayed in
and for Circuit B.
48
RESET PROBABLE
METHOD CAUSE
Automatic** Faulty transducer/high
pressure switch, low/
restricted condenser
air/water flow.††
Automatic Building load greater
than unit capacity, low
water/brine flow, or
compressor fault. Check
for other alarms or
alerts.
Manual Low oil level, failed
switch, wiring error,
failed DSIO module
Manual Low oil level, failed
switch, wiring error,
failed DSIO module
Manual Faulty thermistor,
transducer or EXV or
Economizer. Motor cool-
ing solenoid stuck open.
Manual Faulty thermistor,
transducer or EXV or
Economizer. Motor cool-
ing solenoid stuck open.
Manual Plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
Manual Plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
Manual Plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
Manual Plugged oil filter, closed
oil valve, bad oil sole-
noid, compressor oil
check valve stuck, oil
line check valve stuck,
plugged oil strainer
Manual Faulty oil solenoid valve
Manual Faulty oil solenoid valve
Manual Faulty oil solenoid valve
Manual Faulty oil solenoid valve
for Circuit A