1. General description

2. Air Conditioning Equipment

2.1 Conditioned Air Modules

2.2 Fantile Units

2.3 Console Terminal Units

2.4 Return Grilles

2.5 underfloor power

Technical Description
Commissioning and Testing
AET Maintenance Services

1. General description

The Hiross Flexible Space System, designed and built in Italy, is an underfloor airconditioning system making use of the floor void directly as a plenum for the distribution of air. Supply and return channels are created by means of baffles.

The above diagram shows a typical layout of a Hiross underfloor system utilising the following equipment:

Conditioned Air Modules (CAM) are suitably located throughout the office space to generate conditioned air locally to serve the needs of the space. The CAM units deliver conditioned air into the floor void supply plena and draw spent air back through the return plena.

Chilled and Heating water supplies are required and are delivered to the CAM by means of small diameter pipework and condensate water is drained away.

Fresh air may be delivered directly to the CAM from outside or via a central ventilation system. Extract air is usually taken away at high level in the space near risers.

Let into the floor over supply plena are individually controlled fan terminals.

Fan Terminal Units can be recessed in the floor.

Console Terminal Units are suitable if there is not sufficient clearance, and are a floor standing configuration.

These terminals introduce air into the space above in accordance with the dictates of their own on-board controls system.

Return air grilles are positioned in the floor over return plena to permit the return of spent air to the CAM unit for re-conditioning.

The flow of air is controlled by underfloor baffles. In addition the building is generally divided up into several zones per floor and these zones are defined by means of fire barriers placed in the floor void.

The whole system is controlled by means of the electronic management system and Hiromatic advanced controller. All CAMs and Fan terminals can be connected into the system permitting centralised monitoring and control of various functions to take place.

The system may be integrated with a Building Management System subject to compatibility and requirements. We believe that this Intelligent Building is going to become increasingly important.

2. Air Conditioning Equipment

2.1 Conditioned Air Modules (CAM)

Each CAM is a vertically arranged air handling unit containing as standard EU5 Filters, copper pipe/aluminium fin cooling and heating coils, Direct drive fans and comprehensive controls system. (An electric heating coil and Humidifier are optional.)

The unit is made with self supporting steel framework clad with acoustically lined steel panels. The unit is finished in standard powder coat finish and stands on a purpose made base frame.

The base frame is available in a variety of configurations to direct the air as required and is height adjustable +/- 35mm for final cutting in on site level with the access floor. Fresh air ductwork may be connected to the unit but this is not standard. Normally the Fresh Air is introduced to the return air plenum.

Acoustic enclosures are available for situations where the CAM will be installed in office space.

Access for maintenance is only required from the front.

Technical Description

Power and Controls:

The electrical wiring meets IEC regulations.

Each CAM is supplied with a complete internal wiring loom connecting all fitted electrical components. A gland is provided for the incoming power and control wiring and all connections of external control and power cabling is carried out by the installing contractor.

The factory wired board is isolated from the air flow and includes all necessary switches and circuit breakers to serve the specified requirements and has a main isolator for complete isolation of the unit during maintenance or other shut down.

Auxiliary circuits are all supplied at 24v via a built in transformer.

Various volt free contacts are available for use by the customer .

Supply and return sensors are supplied with the units along with a length of two core control cable. These sensors are fitted by the contractor and the wiring run to the control panel in each CAM for connection on the relevant terminals. The supply sensor is usually positioned in the supply air void 3 or more meters down stream from the unit discharge. The return air sensor may be positioned in the return air chamber of the unit or mounted on a wall or column within the zone served.

The Automatic control of the unit is electronic and includes a Macroface board. Visualisation of the controls is achieved through a Hiromatic Controller which provides easy access to set point adjustment and all other built in functions.

Through an optional interface it is possible to link the complete Hiross system to the central BMS. The Hiross system is compatible with most systems on the market but the engineering and definition of actual requirements must be investigated to ensure satisfactory operation.

2.2 Fantile Units.

There are two models available. FTU 450 and FTU 300. The 450 range offers a very quiet and user friendly control but requires 215mm clearance within the floor void. The FTU 300 offers a more simplified control without visualisation locally and slightly lower capacity and requires only 150 - 180mm clearance within the floor void. The major difference is that the FTU 450 has two floor grilles whereas the FTU 300 requires only one.

Each unit contains twin scroll fans driven from a single motor, an open/shut control damper, electric heating coil (optional), and a self contained on board control system.

The units require no pipework or ductwork connections and are easily relocated in a matter of minutes.

A standard factory fitted power cable rated at 5amp minimum links the unit to a segregated power supply. This power may be controlled via the BMS and contactor control to enable the default function on fan speed to be utilised. The standard european plug may be replaced with a 13amp fused plug or specialist cable as an option.

An 8 wire flat data cable links the unit back to the CAM to provide monitoring and control options.

2.3 Console Terminal Units

The console terminal unit is located on top of the access floor with vertical discharge grille and is used where obstructions below the floor preclude the use of recessed terminals or where a preference for this configuration exists.

Each unit contains twin scroll fans driven from a single motor, an open/shut control damper, electric heating coil (Optional), and a self contained on board control system.

The units require no pipework or ductwork connections and are easily relocated in a matter of minutes.

A standard factory fitted power cable rated at 5amp minimum links the unit to a segregated power supply. This power may be controlled via the BMS and contactor control to enable the default function on fan speed to be utilised. The standard european plug may be replaced with a 13amp fused plug or specialist cable as an option.

An 8 wire flat data cable links the unit back to the CAM to provide monitoring and control options.

2.4 Return Grilles

Return grilles constructed in the same material as those used for the fantiles are 600mm long and 150mm wide. They comprise solid parallel aerofoil blades supported with transverse bars and coated in neutral silver anodised finish as standard. Other colours are available as an option.

The grilles have the same height adjustment feature as the Fantile grilles for easy alignment with the final floor covering.

The grilles may be supplied with collecting tray, opposed blade control dampers and acoustic attenuator as additional options.

2.5 underfloor power

We recommend that the power to Fan terminals is provided from a segregated supply to enable easy control and isolation.

Modular power track is available in many forms but we recommend the use of Electropatent equipment which under current IEE regulations allows flexible cables in excess of 3m which is the limit for all 63 amp rated busbars.

Simple contactor control at the tenant board enables the fantile circuits to be controlled separately from the CAM units and any other power services in the building.