Airedale Dry coolers DR10 - Manual (Page 8)

DR10-95
DRY COOLERS
8
Precision Air Conditioning
Technical Manual :6877401 12 / 2011
8
Dry coolers
Technical Manual :6877401 V1.1.0 02_2013
Optional Extras - Energy Saving
ELECTRONICALLY
COMMUTATED (EC) FAN
MOTOR Shall incorporate external EC rotor motor technology to provide highly accurate
discreet speed control. The fans offer maximum air flow performance while keeping
sound levels to a minimum.
Each fan shall incorporate electronically commutated DC motor control using semi-
conductor modules responding to a signal from the Airedale indoor unit.
EC motors are DC motors with integrated AC to DC conversion; this gives the
flexibility of connecting to AC mains with the efficiency and simple speed control of a
DC motor. The EC fan shall offer significant power reduction in comparison with
equivalent AC fan at both full and modulated fan speeds. The inbuilt EC fan control
module shall allow for fan speed modulation from 0-100%, the modulating range of a
standard AC fan is typically 40-100% of full fan speed.
Optional Extras
– General
SHORT CASE AXIAL FANS
(SCAF) Short case axial fans shall be supplied for indoor installations where discharge air
requires to be ducted to an outdoor location. The fans shall meet duty plus nominal
75Pa of external static pressure.
CORROSION RESISTANT
COATED COILS For aggressive atmospheres a corrosion resistant coating shall be applied to the
aluminium fins.
SHUT OFF VALVES Where unit isolation for easier maintenance is required, shut off valves shall be
supplied loose for on site fitment.
COIL GUARDS Protective mesh guards can be fitted to each of the outer coils to protect against
damage.