Table of Contents
Advertisement
ALARM/ALERT
ALARM OR
CODE
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
— Compression 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 imbalance alarm x.25 may be changed to warning x.27 after suc-
cessful start-up of the chiller.
†Compressors are equipped with 2 motor winding temperature thermistors.
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 36 — Alarm and Alert Codes (cont)
WHY WAS THIS
DESCRIPTION
ALARM GENERATED?
Circuit A Low Oil
Level switch input open
Level/Flow
for 4th time in same day.
Circuit B Low Oil
Level switch input open
Level/Flow
for 4th time 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 A shut down after
4th failure in 24 hours.
Circuit B shut down after
4th failure in 24 hours.
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
= Discharge Pressure, P
d
P
= Oil pressure and P
= Economizer pressure
o
e
Two oil pressure set points are used. Oil Set point 1 is always 15 psig.
a. If (P
P
) < 125, then Oil Set point 2 = 0.235 x (P
d -
s
b. If (P
P
) >= 125 and < 165, then Oil Set point 2 = 2.0 x (P
d -
s
c. If (P
P
) >= 165, then Oil Set point 2 = 0.6364 x (P
d -
s
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 120 seconds after starting, the alert will be gen-
erated if (P
- P
) < [(Oil Set point 1)/120] x (Compressor Run time in sec-
o
e
onds) for 3 consecutive readings
c. After 120 seconds of run time, the alert will be generated if:
1)(P
- P
) < Oil Set point 1 for 15 seconds OR
o
e
2)(P
- P
) < Oil Set point 2 for 25 seconds
o
s
2. (P
- P
) is the Oil pressure differential displayed in
o
e
and in
for Circuit B.
50
PROBABLE
RESET METHOD
CAUSE
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, trans-
ducer, or EXV, or Econo-
mizer. Motor cooling
solenoid stuck open.
Manual
Faulty thermistor, trans-
ducer, or EXV, or Econo-
mizer. Motor cooling
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
= Suction pressure,
s
P
) + 0.588
d -
s
P
d -
P
) + 5.0
d -
s
for Circuit A
) - 220.0
s
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
