I have lingered for a while now without posting. I have not followed up with Carrier specifically, but I received a notification from one of my vendors regarding my 19XL's in a specific building:
...Carrier Model 19XL Centrifugal Chiller PSIO Control Module Obsolescence
The purpose of this communication is to discuss the obsolescence of the Processor Sensor Input/Output (PSIO) module
that provides direct digital control for the Carrier model: 19XL high pressure centrifugal chillers currently operating at
The modules are no longer manufactured and the remaining Carrier Replacement Components Division stock has been
If the PSIO module fails, the chiller will be completely down until a Carrier 32RetroPIC11 controls conversion can be
performed. The retrofit would take approximately 7-10 days at a cost of $40,000 to $45,000 to complete.
Given the age and operating hours of the existing chillers, it might be more cost effective to budget replacement rather
than performing the direct digital controls retrofit.
I would be pleased to provide a cost effective comparison regarding energy and operating cost savings associated with
replacing the existing centrifugal chillers.
Have any of you run into problems procuring parts for these chillers? The last thing I've had to purchase was an actuator for the IGV.