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EWAD500TZ-SR
Технические данные Страница: 72

Daikin EWAD500TZ-SR [72/75] Technical specifications

TECHNICAL SPECIFICATIONS

Compressors

• Semi-hermetic, single-screw type with one main helical rotor meshing with gaterotor. The gaterotor will be constructed of a carbon

impregnated engineered composite material. The gaterotor supports will be constructed of cast iron.

• Each compressor shall be fitted with inverter drive for variable capacity control. Inverter shall be integrated within the compressor

casing and it shall be cooled by liquid refrigerant.

• The oil injection shall be used in order to get high EER (Energy Efficiency Ratio) also at high condensing pressure and low sound

pressure levels in each load condition.

• Refrigerant system differential pressure shall provide oil flow through service replaceable, 0.5 micron, full flow, cartridge type oil filter

internal to compressor.

• Refrigerant system differential pressure shall provide oil injection on all moving compressor parts to correctly lubricate them.

Electrical oil pump lubricating system is not acceptable.

• The compressor’s oil cooling must be realized, when necessary, by refrigerant liquid injection. External dedicated heat exchanger and

additional piping to carry the oil from the compressor to heat exchanger and vice versa will be not accepted.

• The compressor shall be provided with an integrated, high efficiency, cyclonic type oil separator and with built-in oil filter, cartridge

type.

• The compressor shall be direct electrical driven, without gear transmission between the screw and the electrical motor.

• The compressor casing shall be provided with ports to realize economized refrigerant cycles.

• Shall be present two thermal protection realized by a thermistor for high temperature protection: one temperature sensor to protect

electrical motor and another sensor to protect unit and lubricating oil from high discharge gas temperature.

• The compressor shall be equipped with an electric oil-crankcase heater.

• Compressor shall be fully field serviceable. Compressor that must be removed and returned to the factory for service shall be

unacceptable.

Cooling capacity control system The chiller will have a microprocessor for the control of the compressor capacity through

inverter in order to continuously modulate the compressor’s rotational speed.

• The unit capacity control shall be infinitely modulating, from 100% down to minimum capacity which shall not be higher than 33% on

single circuit units and 15% for dual circuit models. The chiller shall be capable of stable operation to minimum capacity without hot

gas bypass.

• The system shall control the unit based on the leaving evaporator water temperature that shall be controlled by PID (Proportional

Integral Derivative) logic.

• Unit control logic shall to manage frequency level of the compressor electric motor to exactly match plant load request in order to

keep constant the set point for delivered chilled or hot water temperature.

• The microprocessor unit control shall detect conditions that approach protective limits and take self-corrective action prior to an alarm

occurring. The system shall automatically reduce the chiller capacity when any of the following parameters are outside their normal

operating range:

- High condenser pressure

- Low evaporating refrigerant temperature

Unit-mounted Compressor’s Inverter and Electrical Requirement Customer electrical connection for

compressor motor power shall be limited to the main power lead to the single point power connection located into electrical panel.

• The Inverter shall be refrigerant cooled type. Water cooled design or air cooled designs are not acceptable.

• The Inverter full load efficiency shall meet or exceed 97% at 100% Inverter rated capacity.

• Base motor frequency shall permit motor to be utilized at nameplate voltage. Adjustable frequency range, monitored by unit’s

microprocessor control, shall permit a stable unit capacity control down to minimum capacity without hot-gas bypass.

• Unit starting current shall not exceed 3 A.

• Unit displacement power factor shall be not less than 0.95 on entire unit capacity range, from 100% down to minimum capacity.

Page 72 of 75

Daikin EWAD500TZ-SR [72/75] Technical specifications

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