Optus – Head Office Perth

HVAC | AC installation, Computer Room AC installation, BMS & Energy Monitoring Upgrade & Fire Relief Suspression
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Apex Technical Services is currently under taking electrical and mechanical works at Optus at 2 Victoria Ave.

This project included:

  • Supply and installation of new AC’s and CRAC units as designed by the Engineering Consultants.
  • Supply and installation of new duct and diffusion
  • Supply and installation of new Building Management System and CREMS System
  • Supply and installation of new Exhaust System
  • Value Engineering from Temperzone Units to Daikin Water Cooled VRF

GENERAL DESCRIPTION

The project involves the provision of office space for Optus on level 3, 2 Victoria Avenue, Perth.

The existing base build provision comprises a completed toilet facilities and open plan office space to a Green Star Rating of 6. No Green Star rating is being sought for the fitout works.

The fitout includes the provision of open plan office and break out spaces as well as a number of enclosed rooms including but not limited to meeting rooms, quiet rooms, store rooms, a training room and a board room. Staff amenity areas are provided in the form of a “Social Area”, a “Pit Stop Area” as well as a Parents Room and a Prayer Room.

A server and hub room are to be provided to accommodate relevant IT equipment.

Wherever possible the existing services installation shall be re-used with minimal modification however some areas have the existing ceiling tile system being replaced with plasterboard ceilings.

Fan – In Line Centrifugal

General

  1. In-duct mounted type of approved manufacture with the motor located in the air
  2. Select fans and motors for air flow rates of 10% more than specified against corresponding increase in system
  3. Provide fan operating status/interlock by flow switch mounted in the discharge side of the fan, conditioner, casing or
  4. Alternatively differential pressure sensor or current sensor as part of the control system may be
  5. Fan contactors and auxiliary relays fed from the fan power supply are not to be used for fan status or interlock signals unless in series with a remote sensor such as differential pressure switch or flow switch.
  6. Noise spectra to be provided for all proposed fans in terms of Sound Power Levels measured in accordance with ISO 5136:2003 (BS 848-2.5:2003) in 1/1 Octave Bands Centre Frequencies 63 Hz – 8

Construction

  1. Fan casing: Galvanised sheet steel or rigid PVC, with facility for removal of impeller/motor assembly without disconnecting the fan assembly from the
  2. Fan impeller, Aluminium, GRP, galvanised steel or rigid PVC with backward inclined

Fan/Motor Assembly

  1. Comply with the ‘Motors’ Clause, in this Section of the
  2. Motor bearings: Ball or roller type, sealed for life selected for an operating life of not less than 30,000 hours.

Air Conditioning Unit – Water Cooled

General

  1. Units approved manufacture with local factory
  2. Units to be quiet running and free from vibration to the building
  3. Operate on refrigerant, R410A, R-134a or other approved non-CFC/HCFC
  4. Units to be complete with flexible connections, anti-vibration mountings or hangers as applicable, air filters, refrigeration system, pipework and drain pans and

Casings

  1. Unit casings fabricated from not less than 1.15mm zinc coated steel sheet factory
  2. Casings to be fitted with removable panels to provide full access for
  3. Casings and access panels to be internally thermally insulated with not less than 25mm of aluminium foil faced mineral wool or 12mm of foil faced polyethylene
  4. One piece fully welded drip tray fabricated from minimum 1.55mm zinc coated steel sheet suitably painted to avoid corrosion or use 15mm stainless or fibreglass and insulated to suit application.
  5. 25mm drain connections.

Fans and Motors

  1. All fans to be double inlet double width forward curved type, fully balanced both statically and dynamically.
  2. Fan bearings to be of self aligning ball bearing packed for life
  3. Motors to be of drip proof type with a speed of not more than 24 rps and a power capacity to handle at least 110% of design air capacity without overloading and under 24 hour continuous operation if required.
  4. Motors to be fitted with thermal overloads and manual
  5. Fan discharge velocity to not exceed 9m/s.
  6. Fan drives may be direct or multiple matched V-belts.

Condensers

  1. Water connections to be arranged to permit easy removal of the condenser and maybe flanged, have unions or rolled groove
  2. Condensers to be mechanically cleanable type and to be suitable for 1350kPa working pressure on the water side and 2000kPa on the refrigerant
  3.  Each condenser to be fitted with a water regulating valve directly controlled by the condensing pressure of the respective refrigeration system. Pressure drop at maximum design flow through these regulating valves not to exceed

Cooling Coils

  1. Copper tube aluminium fins mechanically
  2. Face velocity to be maximum 0m/s.

Compressors

  1. Hermetic or accessible hermetic
  2. Helical rotor or reciprocating type operating at not greater than
  3. Protect compressors from electrical shortcircuit. Also provide manual reset thermal cutout on motor windings.
  4. Compressors to be fitted with:
    1. Fully automatic splash or pressure feed lubrication system designed to maintain positive lubrication of all moving parts at any operating
    2. Crankcase heaters; on when the compressors not running; served by separately fused
    3. Discharge
    4. Anti-vibration mounts.
    5. Filter
    6. Controls:
      1. Automatic reset low pressure
      2. anual reset high pressure switch.
      3. Start limiting

Air Conditioning Unit – Water Cooled, Computer Room

General

  1. Units to be Schneider Electric, Stulz or Emerson or equal and
  2. Units to have local factory
  3. Units to be quiet running and free from
  4. Units to be complete with outer casing, evaporator coil and fan, compressor/motor assembly, humidifier, heating elements and water cooled
  5. Operate on refrigerant, R410A, R-134a or other approved non-CFC/HCFC

Casing

  1. Unit casings fabricated from welded and galvanised steel frame and 1.15mm zinc coated steel sheet with factory
  2. Casings to be braced as necessary and fitted with removable panels to provide full access for maintenance. Panels to be gasketted for air tightness and catches to be simple to operate without tools and close firmly on
  3. Casings and access panels to be internally insulated with not less than 25mm of aluminium foil faced mineral wool or 12mm of foil faced polyethylene foam.
  4. One piece fully welded drip tray suitably treated to avoid corrosion and
  5. 25mm drain connections.

Fans and Motors

  1. All fans to be double inlet double width forward curved type, fully balanced both statically and dynamically. Where specified, fans to be EC
  2. Fan bearings to be of self aligning ball bearing packed for life type selected for 100,000 hours
  3. Motors to be of drip proof type with a speed of not more than 24 rps and a power capacity to handle at least 110% of design air capacity without overloading and under 24 hour continuous operation if required.
  4. Motors to be fitted with thermal overloads and manual
  5. Fan discharge velocity to not exceed 8 m/s.
  6. Fan drives may be direct or multiple matched V-belts.

Condensers

  1. Condensers to be of mechanically cleanable type and to be suitable for 1350kPa working pressure on the water side and 2000kPa on the refrigerant
  2. Water connections to be arranged to permit easy removal of the entire unit and the
  3. Each condenser to be fitted with a water regulating valve directly controlled by the condensing pressure of the respective refrigeration system. Pressure drop at maximum design flow through these regulating valves to not exceed

Cooling Coils

  1. Two independent evaporator circuits where multiple compressors are
  2. Copper tube and aluminium fins mechanically bonded and treated to resist corrosion with stainless steel condensate tray with trapped drain pipe of not less than 20mm extended to the face of the unit
  3. Face velocity maximum 0m/s.

Compressors

  1. Serviceable hermetic or accessible hermetic type at 24rps maximum
  2. Helical rotor or reciprocating type operating at 48rps maximum
  3. Protect compressors from electrical shortcircuit. Also provide manual reset thermal cutout on motor windings.
  4. Compressors to be fitted with:
    1. Fully automatic splash or pressure feed lubrication system designed to maintain positive lubrication of all moving parts at any operating
    2. Crankcase heaters; on when the compressors not running; served by separately fused
    3. Discharge
    4. Anti-vibration mounts.
    5. Filter dryer, oil strainer.
    6. Controls:
      1. Automatic reset low pressure
      2. Manual reset high pressure switch.
      3. Start limiting
      4. Head pressure control devices and automatic pump down as

Filters

  1. Removable filters of Type 1, Class A as defined by AS 1324.1, or other as
  2. Not less than 50% efficient by the N.B.S. Automatic Dust Spot
  3. Accessible for service.
  4. Frames and holding frames to be complete with airtight

Electrical and Controls

  1. Electrical sub-board incorporating circuit breakers, contactors, overloads and controls factory fitted, wired within the unit and connected as required to terminal strip for field
  2. Supplementary additional equipment necessary for satisfactory operation shall be
  3. Compressor lead/lag sequence switch and timers to limit the number of starts of each compressor to 12 per hour.
  4. Automatic control by an electric or integrated solid state control system including temperature and humidity controls and visual display of operating modes and
  5. Where EC fans are specified, multiple units shall be able to run in parallel and automatically take the load upon the failure of one unit, where redundant capacity is

FUNCTIONS

  1. Separate stop and start
  2. Alarm mute
  3. Alarm indication (red) for:
    1. Loss of air
    2. Filter pressure drop.
    3. High space temperature and
    4. Low under floor supply temperature and
    5. High head pressure – Compressor No.
    6. High head pressure – Compressor No.
    7. Operating indication (white or green)
  1. Available alarms and indicators to be nominated as standard or

Water Detection System

Water sensing elements on the floor, and alarm/display panel.

Mounting

  1. Supported off the floor slab by an adjustable galvanised steel stand specifically designed to support the unit in a level position at the raised floor height.
  2. Down blow units to be complete with air turn ‘scoop’ to direct air under the raised
  3. Neoprene anti-vibration pads fitted between the unit and the

Commissioning

  1. Factory tested and supplier commissioned and tested on
  2. Commissioning data to be submitted to the

Spare parts

Complete stock of spare parts to be readily available in Perth.

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