Logicool ™ chillers, General description – Airedale LogiCool FreeCool 40kW User Manual
Page 6
LOGICOOL
™
Chillers
6
Chillers
Technical Manual : 6521355 V1.8.0 07/2014
General Description
STANDARD FEATURES - ENERGY SAVING
Evaporator
Stainless steel high efficiency brazed plate heat exchanger(s) will allow optimum heat
transfer between media. Each heat exchanger is insulated with closed cell polyurethane
foam to Class 1 fire rating and the material is UV resistant.
A self-regulating pad heater is fitted to the single evaporator and will protect against
freeze up in ambient temperatures as low as -20°C.
Condenser
Large surface area coil(s) ideally positioned to optimise airflow and heat transfer,
manufactured from refrigeration quality copper tubes with mechanically bonded
aluminium fins.
The copper tube is internally rifled for improved heat transfer.
Free-Cooling Coil
Large surface area coil(s) ideally positioned to optimise airflow and heat transfer,
manufactured from refrigeration quality copper tubes with mechanically bonded
aluminium fins.
Spacing between condenser and free-cooling coils is provided for cleaning maintenance
along with top access holes and drain holes to the base.
Fan & Motor Assembly
Sickle bladed fan assemblies with integral long bellmouth and fingerproof grille;
incorporate external rotor ac motor technology, capable of highly accurate discreet speed
control, 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; refer to
Head Pressure Control
3 phase head pressure controllers are fitted which modulate the fan speed to maintain a
constant condensing pressure in the DX mechanical cooling mode and afford reductions
in input power when overcooling in low ambients.
A pressure transducer is fitted to the liquid line which in turn feeds back the head
pressure to the microprocessor. The condenser fan speed can then modulate via the
controller to provide optimum control under varying ambient conditions. The head
pressure can be monitored via the display keypad.
Additional refrigeration valves are fitted to allow mechanical and free-cooling functions to
operate simultaneously in order to maximise free-cooling and minimise
energy consumption.