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Compact

air- or water-cooled direct

expansion air conditioners of large

cooling capacities, with downflow air

discharge, designed to guarantee precise

temperature and humidity levels for

information technology applications and

for centralised air conditioning.

With BDA units 1 metre free space must

also be left clear to the right of the unit in

order to allow access to the compressors

for refrigerant charging and other

maintenance operations.

GENERAL DESCRIPTION

FRAME

constructed from steel tube

welded to 2 mm thick steel box section

base, painted with RAL 7021 (dark grey)

epoxy powder.

CONTOUR PANELS

in 1,2 mm steel

sheet, painted with RAL 9001 (cream

colour) epoxy powder and lined with

acoustic and thermal self-extinguishing

insulation, dust and fibre-free. The front

doors are fixed to the frame with quick

release fasteners.

REMOVABLE INTERNAL PANELS

lined with acoustic insulation isolating all

compartments affected by the airstream

in order to:

- decrease the overall noise level;

- ensure air tightness even when the front

doors are open;

- allow checks on internal components

with the unit in operation.

SIDE COMPARTMENT

, containing the

electrical panel, the humidifier and all the

refrigeration components, separated from

the air stream for ease of maintenance

without disturbing operation of the unit.

FILTERS

in self-extinguishing media

with an efficiency of EU4 (doc. Eurovent

4-5), mounted on a metal frame.

FAN SECTION

(belt driven type)

Centrifugal double-inlet fans in galvanised

steel with forward blade impeller and

permanently lubricated bushes.

Class F/IP55 4-pole triphase motors

mounted on adjustable belt-tensioning

supports. The whole mechanism is

completely vibration-free thanks to perfect

balancing and the use of “Taperlock”

pulleys.

AIRFLOW SENSOR

to activate an alarm

in the case of low or zero air flow.

COOLING COIL

constructed of copper

tubes expanded into aluminium fins; the

large frontal surface coil, mounted

upstream of the fans to ensure uniform

air distribution, is mounted on a stainless

steel tray with a flexible hose to drain the

condensate (BD* units are fitted with two

coils).

REFRIGERANT CIRCUIT/S

including:

- liquid receiver with shut-off and safety

valves or, alternatively, water cooled

condenser;

- filter-dryer and liquid sight glass;

- thermostatic expansion valve;

- low and high (manual reset) pressure

switches;

- schraeder valves for charging and for

pressure checks;

- external connections (in air cooled

units).

WATER-COOLED CONDENSER

(water-cooled models)

of the brazed

plate type constructed of stainless steel.

3-STEP ELECTRICAL REHEAT (in

version T or H)

with integral fin elements

constructed of aluminium with a safety

thermostat which, in the event of

overheating, cuts the power supply and

activates the alarm.

ELECTRODE BOILER HUMIDIFIER (in

version D or H)

with modulating steam

production and automatic control of

water salinity to ensure successful

operation on any untreated water supply.

ELECTRICAL PANEL

complying with

IEC recommendations, housed in a

compartment isolated from the air stream

and including:

- 24 V control circuit transformer;

- safety screen for all mains voltage

components;

- mains isolator mechanically interlocked

with the safety screen;

- miniature circuit breakers;

- contactors.

MICROPROCESSOR CONTROL

provide highly accurate real-time control

of environmental conditions, while

providing an exhaustive display of all

operating parameters as well as any fault

conditions.

USER TERMINAL

for the setting and

visualization of the function parameters of

the unit.

OPTIONAL ACCESSORIES

FRESH AIR FILTER

to be connected to a

source of fresh air via flexible ducting.

HIGHER EFFICIENCY FILTER

in non

woven self-extinguishing media with an

efficiency of EU5 (doc. Eurovent 4-5),

mounted on a metal frame.

HEIGHT ADJUSTABLE

(± 25 mm, 200

mm minimum)

MOUNTING FRAME for

installations on a raised floor

, complete

with rubber isolator pads.

SUCTION PLENUM

, lined with acoustic

insulation, to connect the top of the unit

with the ceiling or the ductwork when

return air is ducted; height: 600mm.

SOUND ABSORBING SUCTION

PLENUM

as above, including sound

attenuators; height: 450 mm.

HOT WATER REHEAT COIL

constructed from copper tubes and

aluminium fins, complete with three-way

motorised control valve.

HOT GAS REHEAT COIL

with three-way

solenoid valve for reheating using the

condenser heat of the refrigerant circuit.

BAROSTATIC VALVE (water-cooled

models)

to control condensing pressure

by metering the water flow rate.

CONDENSING PRESSURE

REGULATOR

(pressostatic valve)

for

close circuit water cooled units

, by

means of a three-way valve in the

refrigerant circuit.

SITEC REMOTE CONTROL CARD

(only with mP3 control)

for remote

electrical control of the unit.

ASM2 BOARD FOR DATA

TRANSMISSION (for units with mP3

control)

to a remote BMS station via an

RS422 port or, with an external adaptor,

an RS232 port.

SERIAL ADAPTOR RS422-RS485 (for

units with mP20 control)

for connecting

to supervisory / maintenance systems.

LAN CARD

for local network.

CLOCK CARD

for the management of

time bands and the counting of operating

hours.

LAN CARD

CLOCK CARD

FIRE and/or SMOKE DETECTOR.

WATER LEAK DETECTOR

comprising a

socket-mounted detector connected to as

many leakage sensors as required.

SPECIFICATIONS

UNIT

IDENTIFICATION

SYSTEM

EXAMPLE:

BDA2002HPA is a downflow unit with top air return:
- Air-cooled condensing system;
- An indicative cooling capacity of 20.0 Tons and 2 compressors;
- C Electric Humidifi Dehumidification function;
- MP20 Microprocessor control;
- Supply voltage: 400V.

200

AIR

PATTERN

COOLING

SYSTEM

UNIT SIZE

NUMBER OF

COMPRESSORS

CONFIGURATION

CONTROL

SYSTEM

D = Downflow;