Emerson Liebert InteleCool 2 Manual de usuario descargar pdf (Pagina 7)

Stan dard fea tures - all sys tems

Cabinet

The cabinet is manufactured from zinc coated steel, it is then

de-greased and painted in “Pearl White” (RAL7032) dry

powder epoxy resin paint. The paint finish is easily cleaned

and is hard wearing.

The cabinet has been designed specifically for outdoor

applications, all materials, fittings and components have been

selected to provide maximum weather protection, durability

and security (vandal-proof cabinet). The unit has removable

panels (a special key is required) which give access to all

internal components.

The condenser air inlet is through metallic grilles at the side

of the unit. Condenser air outlet is from the bottom of the front

panel. A metal safety grid prevents accidental contact with

the fan and the coil. The compressor is located in the bottom of

the unit. The panels are insulated with 10 mm, 70 kg/m

density, mineral wool.

Refrigeration circuit

The units are single circuit with a hermetic compressor (rotary

on models LEX04/05/06E, scroll on models LEX08/10/14E).

The circuit incorporates a thermostatic expansion valve

(capillary tube on models LEX04/05/06E) which controls the

refrigerant flow to the evaporator. A filter dryer is provided in

the liquid line to eliminate moisture from the system and

maximum efficiency for increased working life.

The compressor has a manual-reset high pressure switch for

high pressure protection and a high pressure alarm circuit to

warn of high system pressures, allowing corrective action to

be taken before a significant loss of temperature control

occurs. The low pressure switch is auto-resetting and detects

low pressure conditions such as loss of refrigerant charge. The

low-pressure switch incorporates a delay for winter start

operation.

Crank case heat ers

Crankcase heaters are standard on all models. They maintain

minimum refrigerant temperature and are energised while the

unit is powered and the compressor is off.

Evaporator section

Evapo ra tor coil

The evaporator coil is constructed from copper tubes with

aluminium fins to ensure maximum heat transfer. It is

designed to maximise the available surface area resulting in

low face velocities, low internal air pressure drops and the

high sensible heat ratios. A corrosion resistant drain pan is

provided on all models.

Evapo ra tor fan mo tor

The units are equipped with two centrifugal fans with forward

curved impellers, housed in galvanised steel. A single

double-shafted motor is directly coupled to the two fans

(Model LEX14E has two direct drive fan motors). The fan

impellers are statically and dynamically balanced and

equipped with self-lubricating bearings. The fan is mounted

on vibration-absorbing rubber supports to reduce vibration

transmission between the fan and the unit frame. This

vibration attenuation helps to keep noise emission to a

minimum.

The fan motor is single-phase, IP44 rated and complete with

internal thermal protection.

Condenser section

Con denser coil

The condenser coil is constructed from copper tubes with

aluminium fins to ensure maximum heat transfer. It is

designed to maximise the available surface area resulting in

low face velocities and low internal air pressure drops.

Con denser fan

The condenser section is equipped with a single axial fan with

integral motor. It is also statically and dynamically balanced.

The fan impeller and casing are made from zinc-coated steel

to protect against corrosion. The direct drive motor includes

sealed-for-life bearings. The fan motor is IP54 rated and

complete with internal thermal protection. The fan motor is

controlled by a pressure switch to maintain a steady

condensing temperature.

Fan speed con trol ler

A factory fitted solid state fan speed controller is installed to

maintain the refrigerant condensing pressure. The controller

varies airflow through the condenser to maintain a constant

pressure. The advantages of fan speed control are two-fold.

Higher reliability of the system due to less starts/stops of the

compressor and a lower noise level because the fan is running

at a lower speed, mainly during night time.

SLE ICX TDM E.2 (06/99) 3

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Emerson Liebert InteleCool 2 Manual de usuario Pagina 7

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