Safety Alarms (Temperature); Communications; Other Lights And Switches On The Control Panel - Lydall Affinity User Manual

Operation

Safety Alarms (Temperature)

These controllers have ALM1 and ALM2 lights. ALM2 may or may not operate depending on
the exact model of the PYX controller. The alarm(s) have been preset at the factory to come on
when the temperature of the circulating coolant is above or below the temperature the chiller
has been set to deliver.
The OUT1 light on the controller (when lit) indicates that the refrigerant solenoid valve is open to
allow refrigerant to flow to the heat exchanger. If the light is on most of the time, most of the
chiller's capacity is being used. If the light is on infrequently, much less than the chiller's full
capacity is being used.

Communications

Pins 2 and 5 on the 9-pin connector provide RS485 Communications from the controllers.

Other Lights and Switches on the Control Panel

HIGH PRESSURE WARNING/ALARM: Amber
COMPRESSOR LOW SUCTION: Amber
LOW REFRIGERANT LEVEL: Amber
COMPRESSOR OVERLOAD: Amber
PHASE LOSS/REVERSAL: Amber
LOOP 1 LOW LEVEL: Amber
Lights when a high pressure condition
exists in the compressor. A flashing light
indicates a warning and a solid light
indicates an alarm.
Flashing. Activated when the compressor
suction pressure is below setpoint. The
chiller will shut down after a time delay.
Solid when a low refrigerant level is sensed
in the receiver.
Flashing. Activated after a 2 second delay
by the current sensor in one of the leads to
the compressor motor when the motor has
been shut down due to excessive
temperature.
Solid. Activated when phases of unit need
to be reversed. May happen on initial start
up of unit. If it occurs, switch phases
exterior to unit and power unit again.
Solid when a low level condition is sensed
by the flow switch in the Loop 1 reservoir.