McQuay MAC Especificaciones descargar pdf (Pagina 7)

Features

Refrigerant Circuit

Models MAC/M4AC080~150C/CR has been designed with two separate refrigerant circuits, i.e. it has two

compressors. By doing so, the unit has part loading capabilities, i.e. 0-50-100% of rated capacity. This will

improve the reliability and energy efficiency of the unit, especially during low loading operations. Each circuit is

factory brazed and evacuated before accurately charged with refrigerant to ensure optimum performance.

Because each circuit is separated, there is no danger of cross-contamination should either one of the compressor

experiences a burnt-up. Each circuit is also equipped with a carefully sized thermostatic expansion valve (for

cooling only units) to give optimum performance characteristic. For the heatpump version, the expansion process

is done with capillary tubes.

Scroll Compressor

Scroll Compressors are used (for model which is available) for the units (MAC/M4AC020C/CR using rotary

compressor) to give quiet and reliable performance over a wide operating temperature range. However, in

order to protect the compressors from damage, a phase protector (for model which is available) is provided to

prevent the compressors from rotating in the wrong directions.

Tandem Compressor

M5AC models are using R410A rotary compressors in tandem configuration. Tandem compressors are highly

efficient and cost saving. It reduces mechanical losses, minimize gas flow losses and turbulence. There are 3

steps capacity loading (0-40-60-100%) for M5AC040/050CR and 2 steps capacity loading (0-50-100%) for

M5AC030/055CR.

Condenser Fan Motor

Models MAC/M4AC080~150C/CR is equipped with two high air flow propeller fan blades which are made of

metal. The fans are driven vertically by weather proof motors which are single phase type.

Evaporator

The heat exchanger is made of stainless steel plates closely arranged and brazed together (BPHE) to ensure

high heat exchange efficiency. For models MAC/M4AC080~150C/CR, the water flow through the BPHE in a

channel on its own, while because of the two compressors, the refrigerant flows through another two separate

channels. The refrigeran t will either be in a counter-flow or parallel-flow with respect to the water, depending on

the mode of operation (cooling or heating).

Safety Procetection

The safety protections provided for the mini chiller are:

a) High and low pressure switches

b) Differential water flow switch

c) Compressor, water pump and fan motor overload protectors

d) Anti-freeze protection sensor

During abnormal condition, chiller panel controller will turn off the unit and then display the faults of operation.

Water Tank And Piping Connection

The models M4AC/MAC080~150C/CR does not come with a water buffer tank. However, the unit does come

with an 8 liters expansion tank. Besides that, an optional 135L hydraulic tank is also available.

The external water piping connection can be made either from the left or right side of the unit. Connection is

done with Ø1-1/4 “ female thread couplings for both supply and return pipes.

Meanwhile, MAC/M4AC020~060C/CR does come with a 22 L or 40 L (refer to specification) water buffer tank.

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McQuay MAC Especificaciones Pagina 7