Table 12 Ð LID Primary and Secondary Messages and Custom Alarm/Alert Messages

with Troubleshooting Guides (cont)

N. OTHER PROBLEMS/MALFUNCTIONS

DESCRIPTION/MALFUNCTION

PROBABLE CAUSE/REMEDY

Chilled Water/Brine Temperature

Chilled water set point set too high. Access set point on LID and verify.

Too High (Chiller Running)

Capacity override or excessive cooling load (chiller at design capacity). Check

 

 

LID status messages. Check for outside air in®ltration into conditioned space.

 

Condenser temperature too high. Check for proper ¯ow, examine cooling

 

tower operation, check for air or water leaks, check for fouled tubes.

 

Refrigerant level low. Check for leaks, add refrigerant, and trim charge.

 

Liquid bypass in waterbox. Examine division plates and gaskets for leaks.

 

Guide vanes fail to open. Use control test to check operation.

 

Chilled water control point too high. Access CONTROL ALGORITHM STA-

 

TUS table, MAINT01 screen, and check chilled water control operation.

 

Guide vanes fail to open fully. Be sure that the guide vane target is released.

 

Check guide vane linkage. Check limit switch in actuator. Check that sensor

 

is in the proper terminals.

Chilled Water/Brine Temperature Too Low (Chiller

Chilled water set point set too low. Access set point on LID and verify.

Running)

Chilled water control point too low. Access CONTROL ALGORITHM STA-

 

TUS tables, MAINT01 screen, and check chilled water control for proper

 

resets.

 

High discharge temperature keeps guide vanes open.

 

Guide vanes fail to close. Be sure that guide vane target is released. Check

 

chilled water sensor accuracy. Check guide vane linkage. Check actuator

 

operation.

Chilled Water Temperature Fluctuates. Vanes Hunt

Deadband too narrow. Con®gure LID for a larger deadband (SERVICE1 screen).

 

Proportional bands too narrow. Either PROPORTIONAL INC BAND or PRO-

 

PORTIONAL DEC BAND should be increased (MAINT01 screen).

 

Loose guide vane drive. Adjust chain drive.

 

Defective vane actuator. Check using control test feature.

 

Defective temperature sensor. Check sensor accuracy.

Low Oil Sump Temperature While Running

Check for proper oil level (not enough oil).

(Less than 100 F [38 C])

 

At Power Up, Default Screen Does Not Appear, ``Tables Load-

Check for proper communications wiring on PSIO module. Check that the

ing'' Message Continually Appears

COMM1 communications wires from the LID are terminated to the COMM1

 

PSIO connection. Check for ground or short on CCN system wiring.

SMM Communications Failure

Check that PSIO communication plugs are connected correctly. Check SMM

 

communication plug. Check for proper SMM power supply. See Control Mod-

 

ules section on page 96.

High Oil Temperature While Running

Check for proper oil level (too much oil). Check water supply to oil cooler.

Blank LID Screen (Minimal Contrast Visible)

Increase contrast potentiometer. See Fig. 49. Check red LED on LID for

 

proper operation, (power supply). If LED is blinking, but green LED's are

 

not, replace LID module, (memory failure). Check light bulb if backlit model.

``Communications Failure'' Highlighted Message At

LID is not properly addressed to the PSIO. Make sure that, on ATTACH TO

Bottom of LID Screen

NETWORK DEVICE screen,. LOCAL DEVICE is set to read the PSIO ad-

 

dress. Check LEDs on PSIO. Is red LED operating properly? Are green LEDs

 

blinking? See Control Module troubleshooting section.

Control Test Disabled

Press the Stop pushbutton. The PIC must be in the OFF mode for the con-

 

trol test feature to operate. Clear all alarms. Check line voltage percent on

 

STATUS01 screen. The percent must be within 90% to 110%. Check volt-

 

age input to SMM; calibrate starter voltage potentiometer for accuracy.

Vanes Will Not Open in Control Test

Low pressure alarm is active. Put chiller into PUMPDOWN mode or equal-

 

ize pressure. Check guide vane actuator wiring.

Oil Pump Does Not Run

Check oil pump voltage supply. Cooler vessel pressure under vacuum.

 

Pressurize vessel. Check temperature overload cutout switch.

LID Default Screen Does Not Update

This is normal operation when an alarm is present. The screen freezes the

 

moment the alarm is activated to aid in troubleshooting. The STATUS01 screen

 

provides current information.

Chiller Does Not Stop When the STOP Button is Pressed

The STOP button wiring connector on the LID module is not properly con-

 

nected or the chiller is in soft stop mode and the guide vanes are

 

closing.

LID Screen Dark

Light bulb burned out. Replace as needed.

 

 

92

Page 92
Image 92
Carrier 17EX specifications DESCRIPTION/MALFUNCTION Probable CAUSE/REMEDY

17EX specifications

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