Emerson 3000 User Manual

The drycooler should be located for maximum security and maintenance accessibility. Avoid ground-

level sites with public access or areas which contribute to heavy snow or ice accumulations. To assure 

adequate air supply, it is recommended that drycoolers be located in a clean air area, away from loose 

dirt and foreign matter that may clog the coil. In addition, drycoolers should not be located in the 

vicinity of steam, hot air or fume exhausts. Also, drycoolers should not be located closer than 3 feet 

(1 meter) from a wall, obstruction or adjacent unit.

For roof installation, mount drycoolers on steel supports in accordance with local codes. To minimize 

sound and vibration transmission, mount steel supports across load bearing walls. For ground 

installation, a concrete pad will provide adequate support. Drycooler legs have mounting holes for 

securing the drycooler to steel supports or concrete pad.

Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer to 

electrical schematic when making connections. Make all wiring and electrical connections in 

accordance with local and national codes.

Line voltage electrical service is required for all drycoolers at the location of the drycooler. This power 

supply does not have to be the same voltage as the indoor unit. This separate power source may be 

208, 230, 460, or 575 V, 60 Hz; or 200, 230, or 380/415 V, 50 Hz. The disconnect switch is factory-

supplied and mounted in the electric panel.

A control interlock between the drycooler and the indoor unit is required and is connected between 70 

and 71 in the handy box of the indoor unit and the pump and drycooler control box of the drycooler. 

NEC Class 1 wiring is required.

All wiring to the pump and drycooler from the control box should be done in accordance with the 

electrical schematic on the inside lid of the drycooler control box and with local and national codes.

Risk of electric shock. Can cause injury or death.
Potentially lethal voltages exist within this equipment during operation. Observe all cautions 

and warnings on unit and in this manual.
The Liebert iCOM

®

 microprocessor does not isolate power from the unit, even in the “Unit 

Off” mode. The only way to ensure that there is NO voltage inside the unit is to install and 

open a remote disconnect switch. Refer to unit electrical schematic.
Use voltmeter to make sure power is turned Off before making any electrical connections.

Risk of loose electrical wiring connections. Can cause overheating of wire, smoke and fire 

resulting in building and/or equipment damage, injury or death.
Use copper wire only and verify that all connections are tight.