Emerson ITR Manuel D’Utilisation

The compressor pump-down control is accomplished by a liquid-line solenoid valve used in conjunc-

tion with a low pressure switch.

The Liebert manufactured low profile, direct drive propeller fan type air-cooled condenser provides 

quiet, efficient operation.
It is constructed of aluminum with a copper tube and aluminum fin coil for corrosion resistance. An 

integral, factory wired and tested control panel reduces installation time.

The winter control system features a variable speed motor and a specially designed solid-state fan 

speed control transducer.
The transducer senses refrigerant pressure and varies the speed of the fan motor to maintain con-

stant condensing temperature and system capacity. This system permits operation at ambient tem-

peratures as low as -20°F (-29°C).

The Liebert Lee-Temp winter control system’s heated receivers permit startup and positive head 

pressure control at ambient temperatures as low as -30°F (-34.4°C). The Liebert Lee-Temp package 

includes insulated receiver, a pressure relief valve, three-way head pressure control valves, and rota-

lock valves (see Figure 5 below).

Quiet-Line Condensers can help your facility meet the strictest noise codes, and do so at less cost than 

traditional condensers with acoustical shielding.