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Operation and Maintenance
Envistar Flex
DSEF191101.05.EN
Continuous product development may give rise to specification changes without notice.
5 Operation
5.1 Hygiene inspection
Envistar Flex conforms to guidelines in VDI 6022 Part 1: Hygiene and Hygiene
Inspections of HVAC Systems.
For this to apply, a hygiene inspection of the system must be carried out and the
system must be cleaned thoroughly as needed before start-up.
For units, code MK, US,UC:
NB!
Pressure surges on filters and air ducts must be prevented
through the design of the duct system and the settings/
configuration of the control system (e.g. gradual start of fans,
open damper when the fans are in operation).
5.2 Actions in case of standstill
According to guidelines for hygienic design VDI 6022 Part 1:
In case of prolonged standstill in air treatment systems (more than 48 hours), it
should be ensured that no moist areas can be found downstream of the cooling
coils or humidifier.
In order to avoid the accumulation of moisture – turn off the cooling coils and
humidifier in good time and ventilate the air ducts dry (gradual shut-down). Also,
be sure to set up or program the required functions in the building’s automation/
control system for automatic dry blowing of air coolers and downstream
sections.
