Carrier PC211 specifications Abbreviations and Explanations

Abbreviations and Explanations

Frequently used abbreviations in this manual include:

CCN	—	Carrier Comfort Network	LID	—	Local Interface Device
CCW	—	Counterclockwise	LCW	—	Leaving Chilled Water
CW	—	Clockwise	OLTA	—	Overload Trip Amps
ECW	—	Entering Chilled Water	PIC	—	Product Integrated Control
ECDW	—	Entering Condenser Water	PSIO	—	Processor Sensor Input/Output Module
EMS	—	Energy Management System	RLA	—	Rated Load Amps
HGBP	—	Hot Gas Bypass	SCR	—	Silicon Control Rectifier
I/O	—	Input/Output	SI	— International System of Units
LCD	—	Liquid Crystal Display	SMM	—	Starter Management Module
LCDW	—	Leaving Condenser Water	TXV	—	Thermal Expansion Valve
LED	—	Light-Emitting Diode

The 19XL machines use HCFC-22 and HFC-134a refrigerant. When referencing refrigerant

charges in this manual, the HCFC-22 charge will be listed first and the HFC-134a value will be

shown next to it in [ ].

Words printed in all capital letters or in italics may be viewed on the LID.

The PSIO software version number of your 19XL unit will be located on the front cover.