KOJA Future S, Инструкция по эксплуатации и обслуживанию

Страница: 18 / 41

FUTURE® S AIR HANDLING UNIT
OPERATION AND MAINTENANCE
INSTRUCTIONS
15 December 2020 Ver 1.7 (We reserve the right to changes without prior notice) 16
3 Fans
3.1 Operating conditions
The maximum permissible air temperature upstream of the fan is + 40
°
C.
3.2 Safety
WARNING
Observe general and section-specific safety instructions
WARNING
An EC motor rotating freely generates voltage to the internal motor connections. These
voltages can be dangerously high. After the motor has stopped, wait at least five minutes
to allow dangerous voltages to discharge.
3.3 Commissioning
The fans’ EC motors are equipped with an integrated control unit. EMC requirements do not apply to the EC
motor power cabling. Nevertheless, it is advisable to use screened cable control wires. The bus conductors
must be screened and of the twisted pair type. Any control cable screens are connected on the EC motor end
only. The equipment must be protected against short circuits and the installations against overloading with,
for example, fuses.
• Make sure that the inside of the fan section and the fan are free from any loose parts, debris, etc.
that could get into the fan impeller.
• Check that the electrical cables are intact and routed to the motor flexibly and that the type of the
cable is correct.
•
Check that the drive and fan operate freely by turning the impeller a couple of turns by hand.
• Make sure that the fan’s direction of rotation is correct.
•
All filters, louvres, valves and other parts of the air-conditioning plant must be installed and pre-set
before long-term operation. The fan must not be started with the inlet and outlet dampers closed.
• If necessary, clean the fan casing and impeller with a brush, vacuum cleaner or damp cloth.
•
Check the condition of the motor visually.
• Make sure that the access door gaskets are in place and intact. Close the access door and make sure
that every latch tightens properly.
• If the unit is installed in a place where it is accessible to persons other than service personnel, the
handles of the access doors must be removed and locked in a safe place.
3.4 Maintenance
• The recommended maintenance interval is 6 months.