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.
Purpose of Project To migrate CHW systems on levels 5 from the current CHW system onto the new NE chiller quadrant, with new water temperatures of 20°C / 30°C. Systems Impacted
1 fan wall unit will be impacted systematically however with the current loads within the data suite, the data hall will never be reduced to N.
Risk / impact Increased temperatures in the data halls / Breach SLA’s, risk of damage to equipment
Risk details: The room temperatures will be monitored throughout work effort.
Risk Analysis The fans walls will be migrated one unit at a time in a controlled manner. The system will be monitored to ensure cooling is stable prior to moving onto the next fan walls.
If you have any concerns during this maintenance window, please contact Taiga Cloud Customer Support via the ticket portal or email cloud-support@taigacloud.com.
Posted Jan 27, 2026 - 08:02 UTC
This scheduled maintenance affects: Taiga Cloud Network (Availability United Kingdom (cluster ndcloud-njoerd)).