Daikin DM AHU, Manual

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6.1.3 Fan Array
Fan array is available for EC plug fan.
Ensure all fans are control to run
simultaneously and with same speed.
Fans running at unequal speeds can result
uneven airflow that cause performance,
sound, vibration problems that lead to
failure.
In case one of the fan is down, blank off
plate shall be temporarily installed on the
nonfunctional fan to prevent air re-
circulation while waiting fan replacement
(See Figure 33). If present of differential
pressure controller, ensure the pressure
tube of nonfunctional fan is capped and
amend the setting of controller accordingly.
Figure 33 - Fan Array with Blank-off Plate
6.1.4 Vibration Isolator Mount
Ensure the vibration isolator mounts and
flexible connections allow the fan and
motor to move freely without constrain.
For the fan with Restrained Spring Isolator,
ensure that the Alu Angle plates are
removed from the restrained spring
isolator before commissioning.
IMPORTANT
The clearance between flanges
of “Top plate” and “Base plate”
for restrained spring isolator
should be approximately 10-
20mm.
6.1.5 Coils
Check the pipe-work to coil is correctly
connected and the fins are free from
foreign matter or damage.
Check that the condensate drain is trap.
Ensure good sealing of silicon around the
coil headers and drain pipe.
6.1.6 Damper & Filters
Check all dampers are operating correctly
as per design.
Make sure all filter media are installed in
correct airflow direction.
6.1.7 Panel & Section
Ensure all access panels are in position
and secure. Make sure all necessary
section joints are in place.
6.1.8 Electric Heater
Electric Heater –
Before starting-up,
ensure that the air flow through the
heater should not be lower than 2.0 m/s
to avoid overheating heater.
WARNING
FOR 380-415V/3PH, STAR
CONNECTION WITHOUT NEUTRAL
( Figure 34 ), UNBALANCED PHASE
VOLTAGE MAY CAUSE DAMAGE
ON THE ELECTRIC HEATER.
Figure 34 - Wiring Diagram without Neutral
FOR 380-415V/3PH, STAR
CONNECTION WITH NEUTRAL
(
Figure 35
), NEUTRAL POINT MUST
BE CONNECTED IN ACCORDANCE
WITH WIRING DIARGRAM IN
ORDER TO CARRY CURRENT DUE
TO UNBALANCED PHASE
VOLTAGE.
IMPORTANT
SAFETY THERMOSTAT IS FOR
OVERHEATING PROTECTION
ONLY, NOT FOR CONTROL
PURPOSE. DEFAULT SETPOINT IS
60˚C.
IT MUST BE CONNECTED TO
CONTACTOR (WHETHER
SUPPLIED BY FACTORY OR SITE)
TO CUT-OFF HEATER IN CASE OF
OVERHEATING HEATER.