Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 36)

OptiChill Freecool
Active Cabinet Exhaust
Chillers
36
Chillers
Technical Manual : 7197700 v1.2.0. 02_2013
Fan & Motor Assembly
AC Fan Motor Sickle bladed fan assemblies with integral long bellmouth and fingerproof grille;
incorporate external rotor AC motor technology, capable of highly accurate discreet
speed control and discharges air vertically. The fans offer maximum airflow performance
while keeping sound levels to a minimum.
Each fan is speed controllable and operates from a 3 phase electrical supply.
Energy efficient Electronically Commutated (EC) fans are also available.
Compressor
Twin screw semi hermetic compressors comprising:

Electronic Protection Module featuring:
Motor, discharge gas and oil monitoring
Rotation direction protection
Phase failure protection

Low current Star/Delta Start

Internal pressure relief

Discharge non return valve

Oil separator

Oil sight glass

Oil heater

Slide valve stepped capacity control

Suction gas motor cooling
The compressors are mounted to the rigid galvanised heavy duty sub-frame with the use
of vibration reducing isolation.
Liquid injection is not required under normal operating conditions, leading to an increase
in cooling and efficiency
Closed transition Star/Delta compressor start is available as an optional extra; refer to
Design Features & Information , on page 49 for further details.
Maintainable Dual
Pressure Relief Valve
A 3-way dual shut-off valve assembly incorporating 2 relief valves per circuit allows the
maintenance of individual pressure relief valves without the need for
refrigerant evacuation.
Refrigeration
Each refrigeration circuit is supplied with the following:

Full operating charge of R134a

Electronic Expansion Valves (EEV)

Discharge line ball valve

Liquid line ball valve

Large capacity filter drier with replaceable cores

Liquid line sight glass

Low pressure switch with Auto reset

High pressure switch with manual reset

Suction and liquid pressure transducers

Discharge line mufflers (X Models)