DELRAC ACS has replaced the chiller at the five- storey Whittles House office block in Pentonville Road, London in just 11 days in a challenging contract.
Delrac ACS maintained the old Carrier chiller installed on site under a sub-contract from Cofatec Heatsave, who are responsible for the overall building maintenance.

Lee Roberts of Delrac ACS explains: “We have had previous dealings and contact with Sanderson Weatherall, the Property and Facilities Management company who were aware that we could supply and install air cooled packaged chillers. We were given the opportunity to tender for the project and have now supplied and installed a Carrier model 30 GX 102A PEE air-cooled packaged chiller of around 320kW capacity.”

The Carrier chiller was specified by project consultant NDC. The chiller provides chilled water to the building VAV air handling unit located in the basement plant area.

As part of the chiller replacement programme, Delrac ACS provided a new steelwork support base for the replacement chiller, removed portions of the chiller enclosure to ensure that the right operating conditions were maintained, and modified the existing roof-level chilled water pipework, connecting this to the new chiller.

Delrac ACS also adapted the existing power supplies to suit the new chiller, disconnected and later reinstated existing control wiring from the site building management system, and stripped out/disconnected roof level trace heating of chilled water pipework.

The primary aim during installation was to minimise equipment down time.

The Crane operation covered: lifting the old chiller from the roof and removing it from site (including the later disposal/recycling of the unit); lifting to roof and positioning of new steelwork support base frame.

New chiller location was in a different orientation compared with the old unit so a new secondary steelwork base was required so as to tie up with the roof’s existing equipment supports.

This was completely manufactured/fully assembled off-site as there was no time for any site assembly works.

New chilled water pipework was installed using the Victaulic jointing system – this was chosen to speed up installation, minimise any noise/disruption and to avoid the necessity for welding/hot works at roof level.

The existing electrical power supply cabling to the chiller was adapted and existing control cables/control systems were studied and traced to identify control connections for the new unit since no site records of these could be found.

In addition to this, 700 litres of glycol was added to the chilled water system to give frost protection of the water circuit.

Delrac ACS

020 8335 3141