Level 5 is currently fed from the old building chiller systems to the CW (Chilled Water) Fanwalls. The Fanwalls are designed with a supply air of 24°C under normal conditions to client’s server intake, with SLA temperatures limits of 16°C (low limit) & 30°C (high limit). Global Switch have built a new chiller system that runs under modern design practices and is more efficient and currently being offline heat load tested. The new hybrid chilled water system runs at elevated to the old system CW water flow temperatures. However, the supply air temperature of 24°C will remain the same because the Fanwalls were oversized at design for this migration. Under abnormal conditions estimated for approximately 0.55% of the year, the CHW system will operate in ‘Drift Mode’, meaning higher CW water flow temperatures resulting in higher supply air temperature expected at 27°C, which is still has a good margin to the high limit. As part of the migration the Fanwalls airflow and valve control will be recommissioned and the modes of operation tested under strict script and control measures to ensure all parts of the system operate as designed.
Posted Apr 28, 2026 - 07:19 UTC
This scheduled maintenance affected: Taiga Cloud Network (Availability United Kingdom (cluster ndcloud-njoerd)).