Specifications

23
JOHNSON CONTROLS
Form 201.28-NM1.EN.PED/CE (0211)
4
SECTION 4 - INSTALLATION
LOCATION REQUIREMENTS
For optimum performance and trouble-free service, it is
essential that the installation site meet the location and
space requirements for the model being installed.
It is important to ensure that the minimum service
access space is maintained for cleaning and maintenance
purposes.
OUTDOOR INSTALLATIONS
The units are designed for outdoor installation and
can be installed at ground level on a suitable flat level
foundation easily capable of supporting the weight of the
unit, 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
exposure 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 accessible to unauthorized 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 damage, or possible
harm caused by unauthorized removal of protective
guards or opening panels to expose rotating 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
structural 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 with the same centers
as the unit side and front base rails. This will allow
vibration isolators to be fitted if required. Isolators are
recommended for rooftop locations.
LOCATION CLEARANCES
Adequate clearances around the unit(s) are required for
the unrestricted airflow for the air-cooled condenser coils
and to prevent re-circulation of warm discharge air back
onto the coils. If clearances given are not maintained,
airflow restriction or re-circulation will cause a loss of
unit performance, an increase in power consumption, and
may cause the unit to malfunction. Consideration should
also be given to the possibility of down drafts, caused
by adjacent buildings, which may cause re-circulation or
uneven unit airflow.
For locations where significant cross winds are expected,
such as exposed roof tops, an enclosure of solid or
louver 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 construction,
the same requirement of static pressure loss applies as
for ducts and attenuators stated above.
Recommended Minimum Clearances
Recommended clearances for the YVAA units are:
• Side to wall – 6' (1.8 m)
• Rear to wall – 6' (1.8 m)
• Control panel end to wall – 4' (1.2 m)
• Top – no obstructions whatsoever
• Distance between adjacent units – 10' (3 m)