York YCAV0157-0267, Installation Operation & Maintenance

Page: 29 / 310

29
JOHNSON CONTROLS
FORM 201.21-NM1 (616)
INSTALLATION
LOCATION REQUIREMENTS
To achieve optimum performance and trouble-free
service, it is essential that the proposed installation site
meets the location and space requirements for the model
being installed. For dimensions, refer to the Dimensions
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 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 ex-
posure 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 pro-
tective 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 ex-
tending 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 recom-
mended for rooftop locations.
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-
vided the floor is level and of suitable strength to support
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 re-circulation 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 re-circulation
will affect unit performance.
4