Sterling GP Series specifications Operation, Panel Buttons, Indicator Lights, and Switches

Chapter 4: Operation

4-1 Panel Buttons, Indicator Lights, and Switches

Microprocessor Controller

The standard chillers use a microprocessor-based PID controller. The Carel PCO controller along with the Carel PGD1 Interface is a modular, self-contained unit that can slide from its mounting housing. It is factory set and adjusted; no field adjustment to the internal controls is necessary. The standard operation range is 20ºF to 80ºF (-7ºC to 27ºC).

Figure 3 - Controller Display

Button	Button Description	Detailed description
	Menu Button	Used to access the menus structure of the PGD interface
	On/Off Button	Used to turn the entire chiller On or Off. The button is backlit and will
		turn amber when the chiller is On.
	Back Button	Used to back up from a menu and return to the main status screen
	Up Arrow Button	Used to increment a data field or scroll up within a menu structure.
	Enter Button	Used to accept a data field value or to select a menu item.
	Down Arrow Button	Used to decrement a data field or scroll down within a menu structure.

GP Series Portable Chillers Chapter 4: Operation 22 of 44