Conair MPA, MPW manual Warning Alarms, Possible cause Solution

WARNING ALARMS

The chiller has detected a problem that could lead to a shut down condition if it is not corrected.

◆The Alarm LED lights.

◆The chiller continues operating.

◆The control displays a red LED or alarm code indicating the source of the problem.

Alarm Possible cause Solution

Low Deviation

The actual temper- ature of fluid sup- plied to the process is lower than the setpoint deviation limit allows.

Is the low deviation tem- perature set too low?

Increase the low deviation limit setting. The recommend- ed setting is 2° F to 10° F below the process setpoint.

High Deviation

The actual temper- ature of fluid sup- plied to the process is higher than the setpoint deviation allows.

Is the low deviation tem- perature set too high?

Has the process fluid stopped flowing between outlet and inlet?

Is the unloader valve stuck open?

Increase the high deviation limit setting. The recommend- ed setting is 2° F to 10° F above the process setpoint.

Check for plugged pipes and closed valves. Clear any obstructions and open valves.

See CHECKING THE UNLOADER

VALVE.

SPI Communication

The SPI communi- cation link has failed.

Is the unit connected to a host machine?

Are the network address and baud rate correct?

If the chiller is not connected to a host device, set the SPI address to OFF.

❒Check the network address. The address may be set to any number from 32 to 254 (a hexadecimal integer between 20 and FE), as long as that number has not been assigned to another machine on the same network.

❒Make sure the baud rate (9600, 4800, 2400, or 1200) matches the host machine.

Is something wrong with	Check the communication
the cable?	cable condition and connec-
	tions. The cable must conform
	to SPI standards.

6-10TROUBLESHOOTING microKool Portable Chillers UGH004/0999