Airedale Condensing Units (CU) 3kW - 80kW - Manual (Page 2)

CUS 15 - 60
Condensing Units
Chillers & Condensing Units
Technical Manual : v1.2.0 07_2014
2
COMPRESSOR CUS 15-30D
All units utilise hermetic scroll compressors fitted with crankcase (oil sump) heater to
guard against refrigerant migration during the off cycle and to eliminate oil foaming on
start up. Features include internal motor protection and internal vibration eliminators.
CUS 40-60D
All units utilise hermetic tandemscroll compressors fitted with crankcase (oil sump)
heater to guard against refrigerant migration during the off cycle and to eliminate oil
foaming on start up. Features include internal motor protection and internal vibration
eliminators.
REFRIGERATION Each circuit is fitted with a liquid line shut off valve, complete with integral schraeder
connections for ease of maintenance and installation, The suction line is capped and
sealed for customer connection. A large capacity filter drier is supplied loose for on
site installation. A factory set dual HP/LP switch is fitted to each circuit and features
manual reset on high pressure and auto reset on low pressure.
CONTROLS All units are configured to operate without pump down control.
ELECTRICAL The panel is sub divided into mains and control sections thereby ensuring voltage
integrity between mains (400/230V) and controls (24V). The controls section can be
accessed during normal operation of the unit thereby eliminating the possibility of
coming into contact with any mains voltage. The panel houses all the necessary sub
circuit protection, starters and timers to ensure continuous and efficient operation of
the unit. All units are wired to the latest European codes and standards.
OPTIONS
Head Pressure Control Head pressure is maintained by a factory fitted, pressure actuated head pressure
controller which varies the speed of the fan(s) to provide optimum control under
varying ambient conditions.
Alternative Refrigerant The units can be supplied with Ester oil compressors for use with R407C.
Mains Isolator CUS 15-30D
A weatherproof mains isolator can be fitted to ensure mains isolation of the electrical
panel during adjustment and maintenance.
CUS 40-60D
A weatherproof door interlocking mains isolator can be fitted to prevent access to the
mains section when the electrical power is switched on.
LP Start Kit If unit operation in an ambient below -5°C is envisaged, a low pressure start kit can be
factory fitted which prevents low pressure nuisance tripping on start up.
Phenolic Condenser
Coils In atmospheres where high corrosion is anticipated phenolic coated aluminium finned
coils can be supplied.