69
The input value is either less than 2 mA or greater than 22 mA.
The reset function will be disabled when this occurs.
T177 (4 to 20 mA Demand Limit Input Failure)
— This
alert indicates a problem has been detected with demand limit
4 to 20 mA input. The input value is either less than 2 mA or
greater than 22 mA. The reset function will be disabled when
this occurs.
P200 (Coder Flow/Interlock Contacts Failed to Close at
Start-Up Pre-Alarm)
T200 (Cooler Flow Interlock Contacts Failed to Close at
Start-Up Alert) — If Cooler Pump Control is enabled, (Con-
figuration→OPT1→CPC=ON) and the Cooler Flow Switch/
Cooler Pump Interlock Contacts failed to close within 1 minute
of a start command, a P200 alarm will be declared. This is a
non-broadcasting alarm. The control will wait for flow to be
established before starting any compressors. If after 5 minutes,
the Cooler Flow Switch/Cooler Pump Interlock Contacts have
not closed, the T200 alarm is declared.
Cooler Pump Interlock Contacts failed to close within 1
minute of a start command, a P200 alarm will be declared.
This is a non-broadcasting alarm. The control will wait for
flow to be established before starting any compressors. If after
5 minutes, the Cooler Flow Switch/Cooler Pump Interlock
Contacts have not closed, the T200 alarm is declared.
If Cooler Pump Control is not enabled, (Configura-
tion
→OPT1→CPC=OFF) and the Cooler Flow Switch/Cooler
Pump Interlock Contacts failed to close within 5 minutes of a
start command, a T200 alarm will be declared.
If this condition is encountered, check the following items:
• Check the chilled water flow switch for proper operation.
• Check the flow switch cable for power and control.
• Check the chilled water loop to be sure that it is com-
pletely filled with water, and all air has been purged.
• Check the chilled water pump interlock circuit for proper
operation.
• Check the pump electrical circuit for power.
• Check the pump circuit breaker.
• Check the pump contactor for proper operation.
• Check the chilled water pump for proper operation.
Look for overload trips.
• Check the chilled water strainer for a restriction.
• Check to be sure that all isolation valves are open
completely.
P201 (Cooler Flow/Interlock Contacts Opened During Nor-
mal Operation Pre-alarm)
A201 (Cooler Flow/Interlock Contacts Opened During Nor-
mal Operation Alarm) — This alarm will be generated if the
chilled water flow switch opens for at least three (3) seconds
after initially being closed, and a P201 - Cooler Flow/Interlock
Contacts Opened During Normal Operation Alarm will be gen-
erated and the machine will stop. If flow is proven, the machine
will be allowed to restart. If after 5 minutes, the cooler flow
switch/interlock contacts do not close, the alarm will change to
a A201 - Cooler Flow/Interlock Contacts Opened During Nor-
mal Operation Alarm. When this alarm is generated the chiller
is shut down.
If this condition is encountered, check the following items:
• Check the chilled water flow switch for proper operation.
• Check the flow switch cable for power and control.
• Check the chilled water loop to be sure that it is
completely filled with water, and all air has been purged.
• Check the chilled water pump interlock circuit for proper
operation.
• Check the pump electrical circuit for power.
• Check the pump circuit breaker.
• Check the pump contactor for proper operation.
• Check the chilled water pump for proper operation.
Look for overload trips.
• Check the chilled water strainer for a restriction.
• Check to be sure that all isolation valves are open
completely.
A202 (Cooler Pump Interlock Closed When Pump Is Off
Alarm) — This alarm will be generated if the unit is config-
ured for CPC=ON Cooler Pump Control, (Configura-
tion
→OPT1) without a call for the Chilled Water Pump,
C.LWP=OFF (Outputs→GEN.O) and the chilled water switch
is closed, FLOW=ON Cooler Flow Switch (Inputs
→GEN.I)
for 5 minutes. When this alarm is generated the chiller is not al-
lowed to start.
If this condition is encountered, check the following items:
• Check for a wiring error for the chilled water flow
switch, the chilled water flow switch’s connection to the
MBB, or a wiring error to the chilled water pump.
• Check to see if the chilled water pump control has been
manually bypassed.
• Check for a faulty or grounded chilled water flow switch.
• Check chilled water pump contactor for welded contacts.
Table 55 — Illegal Configurations (Alarm A151)
ILLEGAL CONFIGURATION POSSIBLE CAUSES
AUX BOARD INCORRECT REVISION
Check to see if the AUX Board is an older revision not compatible with the current software.
Check the red LED on the AUX Board to be sure that it is blinking in unison with the other
boards in the unit. If it is not, it is not communicating:
- Check the LEN Communication wiring for continuity to the Main Base Board.
- Check the AUX Board DIP Switch settings for the address.
For 208 volt systems, check the control transformer to be sure that it is tapped correctly.
Consider cycling power to the AUX Board.
AUX BOARD SOFTWARE REV
MUST BE 3 OR HIGHER
Check to see if the AUX Board is an older revision not compatible with the current software.
The AUX Board software revision can be found in the vendor part number, CEPL130567-03.
The -03 indicates Revision 03.
AUX BOARD SHOULD BE AUX1, NOT AUX2
Check the part number of the AUX Board. It should have the Carrier Part Number
32GB500442EE (UTEC Part Number CEPL130567-03). This board is required for the digital
compressor output as well as the Motormaster drive signal. An AUX2 Board, Carrier Part
Number 332GB500432EE (UTEC Part Number CEPL130568-02) does not have the capability
to supply these outputs.
INVALID UNIT SIZE HAS BEEN ENTERED Check to be sure that a valid unit size Configuration
UNIT
SIZE has been entered.
UNIT CONFIGURATION SET TO
INVALID TYPE
Digital compressor, Configuration
UNIT
A1.TY=YES, and hot gas Configuration
OPT1
MLV=YES are both enabled. Only one can be enabled.
FLUID IS WATER, ICE MAKING ENABLED
Ice mode is enabled, Configuration
OPT2
ICE.M=ENBL, but fluid type Configura-
tion
OPT1
FLUD= 1 (water).
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