Liebert Essential Guide to Dry Cooler Piping Diagram and Glycool Systems

							Piping Schematics
Figure 59	Piping schematic—water/glycol, semi-hermetic compressor models
			For systems with drycoolers,
			refer to 12.11.3 - Drycooler Settings.
			Liebert		Optional Dual Pump System Shown
				Expansion
Customer Heat Rejection			Heat Rejection	Tank**		Glycol Pumps
							Check Valves*
			Drycooler		Pressure		(on Dual Pump
					Port *		Systems only)
Cooling Tower			(Glycol )	Aquastat
	and Pump			Sensing			Gate Valves *
	System by			Bulb
	Others			Hose		Air Vents	Pressure Port *
					Shutoff Valve *
				Bib *		(typical) ***
							Flow Switch
							Supplied with Dual
							Pump Systems
	Return	Supply		Shutoff Valve *			Flow-Regulating
							Valve

Return Supply

Liebert DS Unit			Hot Gas Reheat		Return	Supply
(and associated piping)				Optional
	Liquid				Shutoff Valve *	Shutoff Valve *
				3-Way
		Sensing	Evaporator	Regulating	Hose
Service	Cylinder	Bulb	Coil	Valve	Bib *	Hose Bib *
Valve	Unloader (s)	Suction

			Hot Gas Reheat
			Valve
Compressor		External	Check Valve
Muffler	Service Equalizer
Discharge Valve
			Paradenser®
			Condenser
Expansion	Sight
Valve	Glass	Relief valve(s)
Solenoid		supplied with50Hz	To Second
		EU CE units rated
Valve	Filter	maximum 480 PSIG	Refrigeration
	Dryer	(33 Bar).	Circuit

2-Way Regulating Valve

Bypass Valve

Sensor

Factory Piping

Field Piping

Optional Factory Piping

Service/Schrader (Access) Connection No Valve Core

Service/Schrader (Access) Connection With Valve Core

Note: Schematic representation shown. This schematic does not imply or define elevations and component location unless specifically noted ..

Two refrigeration circuits provided. Single refrigeration circuit shown for clarity.

*Components are not supplied by Liebert, but are recommended for

proper circuit operation and maintenance.

**Field-installed at highest point In system on return line to pumps

***Locate at tops of all risers and any intermediate system high points

DPN00895

Rev. 2

84