7
Maintenance
7.1 System owner's responsibility
WARNING!
Only authorised specialist personnel are allowed
to perform the described maintenance measures.
The system owner is responsible for maintenance. The
system owner is responsible for creating a maintenance
plan, for defining the maintenance goals, and for the
functional reliability of the equipment.
The legal regulations must be observed during mainte-
nance, e.g. the system owner is responsible for hygienic
operation in accordance with VDI 6022.
7.2 Maintenance
The VAV terminal unit, the actuator and the electric/
pneumatic control components are maintenance-free
with regard to wear, but the VAV terminal unit must still
be included in the regular cleaning of the ventilation
system. Regular care and maintenance ensure opera-
tional readiness, functional reliability, and long service
life of the VAV terminal unit.
7.3 Inspection measures
DANGER!
Danger of electric shock! Do not touch any live com-
ponents! Electrical equipment carries a dangerous
electrical voltage.
–
Only skilled qualified electricians are allowed to
work on the electrical system.
–
Switch off the power supply before working on
any electrical equipment.
CAUTION!
Crushing hazard.
The damper blade may suddenly open or close.
Switch off the voltage supply before you start
working on the unit.
Personnel:
Skilled qualified electrician
Protective equipment:
Safety shoes
1.
Remove any contamination that affects the func-
tion of the terminal unit, especially around sensor
tubes and measuring probes.
2.
Check all screws for firm seating and retighten
them, if necessary.
3.
Check electrical feeder cables for damage and
firm seating in the terminals.
4.
Adjust the zero point of the differential pressure
transducer, see the documentation for the elec-
tronic control component.
Zero point correction
Only required for control components with
static diaphragm pressure transducer. Control
components with static diaphragm pressure
transducers can be identified by the installation
orientation sticker
Ä
5.
Test the functions of the closed circuits (including
volume flow rate) and, if necessary, correct the set
operating parameters.
6.
Check if the measured values are plausible.
7.
Check special functions (override controls, alarm
suppression on monitoring systems) and make
corrections, if necessary.
8.
Check sequence control functions (room bal-
ancing) and make corrections, if necessary.
9.
Document maintenance measures and measure-
ment results.
7.4 Repair
Repair work is only allowed to be carried out by spe-
cialist personnel or by the manufacturer. Only genuine
replacement parts must be used.
7.5 Maintenance service
Regular maintenance by the TROX Technical Service is
recommended in order to ensure operational readiness,
functional reliability, and long service life of the unit.
The TROX Technical Service can establish the actual
condition of the unit, adapt or correct it if necessary, and
ensure that the unit is in proper condition after mainte-
nance.
Necessary adjustments and parameter setting can be
conducted as part of maintenance so that a high level of
safety is always maintained.
Maintenance
Maintenance service
VAV terminal units VARYCONTROL
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