Condenser Pump Interlock Opened During Normal Operation Alarm; Condenser Pump Interlock Closed When Pump Is Off Alarm; Strainer Blowdown Scheduled Maintenance Due; Loss Of Communication With Water System Manager - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

P221 (Condenser Pump Interlock Opened During Normal
Operation Pre-alarm)
A221 (Condenser Pump Interlock Opened During Normal
Operation Alarm) — If the unit is configured for D.FL.S=
ENBL Enable Cond Flow Switch (Configuration
condenser flow interlock (if used) circuit was established and
opens for 15 seconds. When this alarm is generated the chiller
is prevented from starting or will be shut down; condenser and
chilled water pumps are shut down.
If this condition is encountered, check the following items:
• Check for a condenser pump failure.
• Check for power at the condenser pump.
• Check condenser pump control wiring.
• Check condenser strainer for a restriction. Flush or
replace as necessary.
• Check the condenser water flow switch operation.
• Check condenser water flow switch wiring.
• If the unit utilizes a flow regulating valve for head pres-
sure control, consider disabling this feature.
A222 (Condenser Pump Interlock Closed When Pump is
Off Alarm) — If the unit is configured for Condenser Pump
Control, D.PM.E Enable Condenser Pump (Configura-
tion OPT1) is 1 (On when Occupied) or 2 (On with Compres-
→
sor), the Condenser Flow Switch is enabled, D.FL.S=ENBL
Enable Cond Flow Switch (Configuration
denser flow interlock (if used) circuit is closed while the pump
is commanded off, this alarm will be generated. When this
alarm is generated the chiller is prevented from starting.
If this condition is encountered, check the following items:
• Check for a welded condenser pump contactor.
• Check for a faulty condenser pump relay
• Check for a wiring error.
T302 (Strainer Blowdown Scheduled Maintenance Due) —
This alert is generated when the S.T.DN Strainer Service
Countdown (Run Status
correctly set: MNTH Month of Year, DAY Day of Month, and
YEAR Year of Century (Time Clock
OPT1) and
→
strainer blowdown. Set S.T.MN Strainer Maintenance Done
(Run Status
• Strainer maintenance is required.
T500, T501, T502 (Current Sensor Board Failure — Circuit
Ax — Alert codes 500, 501, and 502 are for compressors A1,
A2, and A3 respectively. These alerts occur when the output of
the CSB is a constant high value. These alerts reset automati-
cally. If the problem cannot be resolved, the CSB must be
replaced.
T950 (Loss of Communication with Water System Man-
ager) — This alert will be generated if no communications
have been received by the Main Base Board for five (5) min-
utes. When this occurs the Water System Manager (WSM)
forces are removed. The chiller runs in stand-alone mode.
• Check CCN wiring.
• Check for power at the water system manager.
• Check Main Base Board for a communication failure.
OPT1) and con-
→
A951 (Loss of Communication with Chillervisor System
Manager) — This alarm will be generated if no communica-
tions have been received by the Main Base Board for five (5)
minutes. When this alert is generated the Chillervisor System
Manager (CSM) forces are removed, and chiller runs in stand-
alone mode.
• Check CCN wiring.
• Check for power at the Chillervisor System Manager.
• Check Main Base Board for a communication failure.
71
PM) has expired. Be sure date is
→
PM) to YES. Then reset the alert.
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If this condition is encountered, check the following item:
If this condition is encountered, check the following items:
If this condition is encountered, check the following items:
DATE). Complete the
→