Airedale OptiChill FreeCool 500kW - 1365kW - Manual (Page 11)

Chillers OPTICHILL
™
Chillers
11
Technical Manual : 6530166 V1.6.0 02_2013
General Description
STANDARD FEATURES
Electronic Expansion
Valves (EEV) ES Electronic expansion valves differ to the normal thermostatic expansion valves in
their ability to maintain control of the suction superheat at reduced head
pressures. This can lead to significant energy savings particularly at reduced
loading and low ambient temperatures. Factory fitted, for full details refer to
Design Features & Information , on page 19.
Head Pressure Control -
Voltage Regulated -
HED Models Only Electronic fan speed controllers are fitted which modulate the fan speed by means of
voltage regulation, maintaining a constant condensing pressure, allowing the system to
operate satisfactorily in ambient temperatures as low as -20°C.
Head pressure can be set and monitored at the microprocessor display.
For optimum efficiency, optional electronically commutated (EC) fans with inbuilt inverter
driven motors are available as an option, refer to
Optional extras , below.
OPTIONAL EXTRAS
Power Factor Correction When applied to the motors of each compressor, the compressor power factor is
controlled to a minimum operating value of 0.95 at the full operating capacity. This
satisfies many supply authorities that may impose surcharges on equipment with power
factor less than 0.95.
Electronically
Commutated (EC) Fan
Motor -
HED Models
ES
Each fan incorporates on board electronics with AC/DC Conversion and inverter
driven DC motor control to offer unparalleled high efficiency levels combined with
smooth stepless speed control and quiet operation.
Sickle blades reduce air turbulence to minimise sound levels and power
consumption whilst maximising performance.
The long bellmouth design provides improved aerodynamics, up to 10% more air
movement, and an extended vertical throw of air to reduce the chance of air re-
circulation. As standard the enclosure is complete with an integral
fingerproof grille.
The fans offer maximum airflow performance while keeping sound levels to
a minimum.
For further details, please refer to Design Features & Information , on page 17.