The plant operating mode cools a room using cooling outside air. The central function sends a "Night cooling request" to the group member rooms. The decision as to whether night cooling makes sense and is energy efficient is made at the central function. Various coordination signals between the primary plant and room automation do the following via central functions:

  • Switch on the fans,
  • Set the mixed air dampers to 100% outside air,
  • Lock all other equipment including heating coils, cooling coils, humidifier.

Night cooling only occurs under the following conditions:

  • The room is vacant (Economy or Protection).
  • The outside temperature is above an adjustable setpoint of 9 °C.
  • The temperature difference to cooling is sufficiently large, i.e. room temperature - outside temperature > 7 K.
  • The temperature deviation from room temperature and temperature setpoint is sufficiently large, i.e. room temperature > room setpoint + 2 K.

Description

Name

Default value

Night cooling

0: Inactive
1: Active

NgtCReq

0: Inactive