- 2 -
3. Handling / Rigging
Air handling units can be delivered as
separate section or completely assembled.
To prevent damage to unit cabinet, a
specific lifting method for offloading the
units is recommended as shown in Figure
1. The spreader bars must be in position
to prevent straps or cables from rubbing
the frame panel. Ensure stability and
balance when lifting the units and avoid
twisting or uneven lifting. Uneven lifting
may lead to accident or fatality which is
out of factory responsibility. Care should
be taken to prevent coil connections, drain
pan connection, damper operators and
accessory section from damage.
Do not push hard on the unit it self of on
the metal base. Use large wooden beam
to evenly distribute the force. Dropping
the units will result in permanently
damage of ball bearing, fan shaft or
loosen coil from the mounting.
AHU with metal base
AHU with wooden base
Figure 1 - Lifting method when offloading units
Transportation on the building site should
be done using forklift truck or a crane
(See Figure 2). The forks must only be
applied under the unit base frame and not
against the panel. In case when fork of
the forklift is too short then suitable
extensions should be used.
Figure 2 - Transportation by forklift truck
4. Storage
For external storage prior to installation,
the units must be protected from dust,
rain, constant sun exposure and rodents.
Although covered in shrink-wrapped
plastic sheeting, this is not intended for
long-term storage and should be remove
as soon as it is offloaded. Unit therefore
should be more protected by tarpaulins or
similar. Avoid exposed the units for coil
connection damages by transient load.
The fan impeller or motor drive must be
rotated once every month. Should the
units be stored for a period of exceeding 6
months, then it is recommended that the
drive belts be removed and store
separately.
IMPORTANT
INSTALLATION
AND
MAINTENANCE
ARE
TO
BE
PERFORMED ONLY BY QUALIFIED
AND EXPERIENCED PERSONNEL
WHO
ARE
FAMILIAR
WITH
NATIONAL AND LOCAL CODES
AND REGULATION.
5. Assembly and Installation
5.1 General
The system design and installation should
follow accepted industrial practice, such as
described in the ASHRAE Handbook.
These units are not designed to be
weatherproof (unless equipped with
canopy) and therefore should not be
installed outdoors. Flexible connections
should be used on the outlet and inlet
duct connections for all units. A minimal
amount of air leakage is normal on the
cabinet and it will not affect unit
performance. The air handling units are
not design to be suspended from the top
of the unit. Therefore, when the unit is
ceiling hung, make sure unit is supported
with a base rail of channel.
