31
ALM102 5 2 AUTOMATIC
Prevent Circuit Startup
or Hard Stop
ALM-102 VFD Fault -
Lost Communication
With VFDA1
Communication between main
controller with VFDA1 lost for 10
consecutive seconds
Verify comm wiring. Verify correct
terminations at VFD. Verify
grounding to comm wire leg. Enable
auto restart so unit restarts
automatically once comm has been
reestablished.
ALM107 10 10 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-107 Coms Loss -
Lost Communication
With IOB1
Communication between main
controller with IOB1 lost for 10
consecutive seconds
Verify that green LED on board does
not flash. Inspect LEN wiring
between SIOB and 1IOB. Power
cycle boards. Verify address on
board.
ALM108 10 10 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-108 Coms Loss -
Lost Communication
With IOB2
Communication between main
controller with IOB2 lost for 10
consecutive seconds
Verify that green LED on board does
not flash. Inspect LEN wiring
between 1IOB and 2IOB. Power
cycle boards. Verify address of
board.
ALM115 10 10 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-115 Coms Loss -
Lost Communication
With SIOB1
Communication between main
controller with SIOB1 lost for 10
consecutive seconds
Verify that green LED on board does
not flash. Inspect LEN wiring to
SIOB.
ALM117 10 10 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-117 Modbus Client
Coms Error
An error was detected in the Modbus
Client driver
Power cycle PIC6 controller.
ALM118 10 10 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-118 Modbus
Server Coms Error
An error was detected in the Modbus
Server driver
ALM202 0 0 AUTOMATIC
Prevent Unit Startup or
Hard Stop
ALM-202 Invalid Model/
Serial Number
Model number or serial number does
not pass validation checks
Retype model and serial number in
accordance with chiller nameplate.
ALM302 10 10 MANUAL
Prevent Circuit Startup
or Hard Stop
ALM-302 ECO EXV
Motor Fault Cir A
The Motor Failure can occur in the
following cases: Overcurrent
protection; Thermal shutdown;
Undervoltage Lockout
EXV motor windings resistance
should be 52 Ohms (10%) for coil A
and coil B. If motor is faulty a new
part is required.
ALM304 0 0 MANUAL
Prevent Circuit Startup
or Hard Stop
ALM-304 EXV Motor
Fault Cir A
The Motor Failure can occur in the
following cases: Overcurrent
protection; Thermal shutdown;
Undervoltage Lockout:
EXV motor windings resistance
should be 52 Ohms (10%) for coil A
and coil B. If motor is faulty a new
part is required.
ALM401 0 0 MANUAL Prevent Circuit Startup
ALM-401 Prestart
Failure - Low Oil
Pressure at Startup Cir
A
The system shall prevent the unit
from starting if ALL of the following
are TRUE:
• Oil Differential Pressure
(PRESSURE_OIL_PD_A) <
18 psi (124.1 kPa)
• Oil Pump is ON
(OUTPUTS_OILR) for Oil Pres-
sure Verification Time*
* Default value is 60 seconds
Check oil pump operation, check oil
level, check oil filters, check for
frequent start/stop of unit which will
prevent proper oil recovery.
ALM501 0 0 MANUAL
Prevent Circuit Startup
or Hard Stop
ALM-501 Protective
Limit - Compressor
Reverse Rotation Cir A
Discharge pressure
(PRESSURE_DIS_P_A) drops more
than 2 psi for five consecutive
seconds after VFDSTART
(CMPA1CTL_cmd) > 0. This alarm
checking occurs up to 20 seconds
after the start command.
Reverse connections of any two VFD
load connections.
ALM503 3 4 MANUAL
Prevent Unit Startup or
Hard Stop
ALM-503 Protective
Limit - Emergency Stop
When any of the emergency stop
sources are set to TRUE. Local
Emergency Stop (APP_LocalEstop);
CCN Emergency Stop
(PROTOCOL_CCNESTOP);
BACnet Emergency Stop
(PROTOCOL_BACESTOP);
Modbus Emergency Stop
(PROTOCOL_MODESTOP);
Remote Emergency Stop
(INPUTS_E_STOP).
Emergency Stop Input. Investigate
cause of emergency stop prior to
restart of unit.
ALM505 0 4 MANUAL
Prevent Unit Startup or
Hard Stop
ALM-505 Protective
Limit - Low Chilled
Water Flow
Compressor operation is allowed
AND (HYDRCFG_eflo_vt) has
expired
AND IF (HYDRCFG_evapfdtp) = 1
and (INPUTS_EVAP_FSW) is
FALSE
OR IF (HYDRCFG_evapfdtp) = 2
and (PRESSURE_EVAP_WDP) <
(HYDRCFG_evapfldp)
OR IF (HYDRCFG_evapfdtp_ = 3
and (INPUTS_EVAP_FL)
<(HYDRCFG_evapfgpm)
Verify setting in Hydronics
Configuration.
Table 11 — PIC6 Alarm Codes (cont)
CODE
HITS TO
ACTIVATE
HITS TO
RESET
RESET TYPE RESPONSE MESSAGE TRIP CONDITION TROUBLESHOOTING
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