Examples of BMS modifications made at 350 Euston Road since the introduction of the new system include:

  • Boilers: Previously the boilers had a fixed temperature set-point of 72°C. The new system adjusts the set-point according to the inside and outside temperatures – so that when it’s warmer outside the boilers don’t have to work as hard. Also, users can set the boilers to switch off up to 60 minutes earlier so that residual heat is used while the building is still occupied. For example, if all the floors are due to be unoccupied at 6pm and the early stop time is set to 30 minutes, then boilers will stop at 5.30pm and fan coil units will stop at 6pm.
  • Low temperature hot water (LTHW) control: Previously the LTHW for the fan coil units had a fixed temperature set-point of 65°C. Now the system adjusts the set-point according to outside air temperatures.
  • Radiators: The secondary LTHW radiator circuit only provides heating for the emergency stairwells. Previously it was interlocked with the time schedule for the fan coil units. Now the radiator pumps are enabled or disabled according to outside air temperatures.
  • Chillers set-point control: Previously the chillers were controlled via a fixed temperature set- point that could only be changed on the chillers themselves. Now the system allows us to programme the set-point for the chillers according to the inside and outside air temperatures.
  •   Chillers start/stop: Like the boilers, the chillers were previously running continually if the floors were occupied. Now the chillers activate when outside air temperatures reach an agreed limit or when the temperature on the floors becomes too high.
  • Additional chillers early stop: Like the boilers, users can now set chillers to switch off up to 60 minutes earlier – so that when it’s cooler outside the chillers don’t have to work as hard. For example, if all the floors are scheduled to be unoccupied at 6pm and the early stop time is set to 30 minutes then the chillers will stop at 5.30pm.
  • Early building purge by air handling units (AHUs): To make the most of cooler temperatures at night in the summer months a ‘Start AHU on Purge’ command had been programmed in. If the inside air temperature is above 23°C (adjustable), cool night/early morning air is pulled in up to three hours (adjustable) before the earliest scheduled start time.
  •   AHU’s 1 & 2 pressure control: The system activates AHU 1 & 2 supply fans according to the required on floor air pressure.

    As the final changes were only made in October the main sets of savings will be experienced next year, but we are still hoping to see a reduction over the winter months.