Section 4 Installation; Location Requirements; Outdoor Installations; Indoor Installations - York MILLENNIUM YCAS Installation Operation & Maintenance

LOCATION REQUIREMENTS

To achieve optimum performance and trouble-free ser-
vice, it is essential that the proposed installation site meets
with the location and space requirements for the model
being installed. For dimensions, weight and space re-
quirements, including service access details, refer to the
Technical Data Section.
It is important to ensure that the minimum service ac-
cess space is maintained for cleaning and maintenance
purposes.

OUTDOOR INSTALLATIONS

The units can be installed at ground level, or on a suitable
rooftop location. In both cases an adequate supply of air
is required. Avoid locations where the sound output and
air discharge from the unit may be objectionable.
The location should be selected for minimum sun expo-
sure and away from boiler flues and other sources of
airborne chemicals that could attack the condenser coils
and steel parts of the unit.
If located in an area which is accessible to unautho-
rized persons, steps must be taken to prevent access to
the unit by means of a protective fence. This will help
to prevent the possibility of vandalism, accidental dam-
age, or possible harm caused by unauthorized removal
of protective guards or opening panels to expose rotat-
ing or high voltage components.
For ground level locations, the unit must be installed on
a suitable flat and level concrete base that extends to
fully support the two side channels of the unit base
frame. A one-piece concrete slab, with footings extending
below the frost line is recommended. To avoid noise
and vibration transmission the unit should not be secured
to the building foundation.
On rooftop locations, choose a place with adequate struc-
tural strength to safely support the entire operating weight
of the unit and service personnel. The unit can be mounted
on a concrete slab, similar to ground floor locations, or on
steel channels of suitable strength. The channels should
be spaced at the same centers as the vibration mounting
holes in the unit base frame and must be at least 120 mm
(4-3/4") wide at the contact points. This will allow vibra-
tion isolators to be fitted if required.
YORK INTERNATIONAL
INSTALLATION
Any ductwork or attenuators fitted to the unit must not
have a total static pressure resistance, at full unit airflow,
exceeding the capability of the fans installed in the unit.

INDOOR INSTALLATIONS

The unit can be installed in an enclosed plant room pro-
viding the floor is level and of suitable strength to sup-
port the full operating weight of the unit. It is essential
that there is adequate clearance for airflow to the unit.
The discharge air from the top of the unit must be ducted
away to prevent recirculation of air within the plant room.
If common ducts are used for fans, non-return dampers
must be fitted to the outlet from each fan.
The discharge ducting must be properly sized with a
total static pressure loss, together with any intake static
pressure loss, less than the available static pressure
capability for the type of fan fitted.
The discharge air duct usually rejects outside the build-
ing through a louver. The outlet must be positioned to
prevent the air being drawn directly back into the air
intake for the condenser coils, as such recirculation will
affect unit performance.

LOCATION CLEARANCES

Adequate clearances around the unit(s) are required
for the unrestricted airflow for the air-cooled condenser
coils and to prevent recirculation of warm discharge air
back onto the coils. If clearances given are not main-
tained, airflow restriction or recirculation will cause a
loss of unit performance, an increase in power consump-
tion and may cause the unit to malfunction. Consider-
ation should also be given to the possibility of down drafts,
caused by adjacent buildings, which may cause recircu-
lation or uneven unit airflow.
For locations where significant cross winds are expected,
such as exposed roof tops, an enclosure of solid or lou-
ver type is recommended to prevent wind turbulence
interfering with the unit airflow.
When units are installed in an enclosure, the enclosure
height should not exceed the height of the unit on more
than one side. If the enclosure is of louvered construc-
tion the same requirement of static pressure loss ap-
plies as for ducts and attenuators stated above.
FORM 201.18-NM2
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