Daikin Maverick II MPS062E, Руководство по установке и обслуживанию

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IM 991-2 • MAVERICK II ROOFTOP 34 www.DaikinApplied.com
Preparing Unit for Operation
Relief Damper Tie-Down
Economizer sections with a 30" or 40" return fan have a
relief damper that is tied down for shipping. Remove the two
brackets and two screws before operation to allow movement
of dampers. Access is from inside the economizer section.
Adjustment of Seismic Restraints
Spring mounted supply air and return air fans may be ordered
with factory installed seismic restraints. Refer to Figure 40 . The
system consists of four snubbers, one located next to each
spring isolator. These snubbers will allow free movement of
the fan assemblies during normal operation because normal
operation will not cause fan movements that exceed 0.25" (6
mm). However, they will restrain the fan assembly and limit
movement to 0.25" (6mm) in any direction if an abnormal
condition were to occur.
The position the fan will assume during normal operation will
be determined by actual job site airflow and static pressure.
Therefore, for proper operation, the seismic restraints must
be field adjusted as part of the normal “Check, Test and Start”
procedure. When the fan is operating in a normal manner there
should be no contact between the snubber restrainer angle
and the snubber neoprene bumper. However, in a “seismic
event,” the snubber will limit movement of the spring mounted
fan assembly to 0.25" (6 mm) in any direction, thereby helping
to prevent the fan from being tossed about and damaged, or
causing damage.
When a seismic restraint is properly adjusted and the fan
is operating normally, the neoprene center bumper will be
centered within the 2" (51 mm) diameter hole in the restrainer
angle, and the restrainer angle will be centered vertically
between the flanges of the neoprene center bumper. This
results in 0.25" (6 mm) clearance in all directions. When the
fan is turned OFF the restrainer angle may come to rest on the
neoprene center bumper.
The seismic restraint is adjustable in all directions. Vertical
slots in the restrainer angle and horizontal slots in the blower
base allow the restrainer angle to be adjusted up and down
and back and forth. The neoprene center bumper is mounted
on a slotted hole allowing its adjustment in and out.
Removing the neoprene center bumper bolt allows removal,
disassembly, and replacement of the neoprene components.
Adjusting Supply Fan Thrust Restraints
Thrust restraints are provided when housed double-width fans
are mounted on springs. After the spring mounts are adjusted
for level operation when the fan is running, check the thrust
restraints. With the fan OFF, set the adjustment nuts so the
spring is slightly compressed against the angle bolted to the
fan housing frame. Refer to Figure 41 . When the fan is turned
ON, the fan moves back to a level position and the thrust
restraint springs compresses.
Figure 40: Cross Section of Seismic Restraint
Figure 41: Thrust Restraint Adjustment
Thrust restraint adjustment (with fan OFF)
1. Loosen jam nuts “A”.
2. Turn nut “C” until spring cup and washer contact thrust restraint angle.
3. Turn nut “B” until spring is compressed by two turns of nut “B”.
4. Tighten jam nuts “A”.
Fan base channel
Adjust up or down
or back and forth
Snubber neoprene
bumper
Snubber neoprene
bumper
.25 (6 mm) gap
(fan running)
Adjust in and out
Snubber restrainer angle
Jam nut A
Nut B
Spring clip
Nut
C
Jam nut A
Washer
Fan bulkhead
Thrust restraint angle
Fan housing frame
See Detail A
Detail A
Thrust restraint adjustment (with fan off)
1. Loosen jam nuts “A”.
2. Turn nut “C” until spring cup and washer contact thrust restraint
angle.
3. Turn nut “B” until spring is compressed by two turns of nut “B”.
4. Tighten jam nuts “A”.