York YCAS0130 - Manual (Page 29)

29 YORK INTERNATIONAL
FORM 201.19-NM1 (204)
INSTALLATION
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 requirements, including service access, refer
to the Technical Data Section.
It is important to ensure that the minimum service ac-
cess space is maintained for cleaning and main te nance
purposes.
OUTDOOR INSTALLATIONS
The units can be installed at ground level, or on a
suitable rooftop location. In both cases an adequate
sup ply of air is required. Avoid locations where the
sound out put and air discharge from the unit may be
ob jec tion able.
The location should be selected for minimum sun ex-
po sure and away from boiler fl ues 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 un au tho 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 re mov al of
pro tec tive guards or opening panels to expose ro tat ing
or high voltage components.
For ground level locations, the unit must be installed
on a suitable fl at 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-
tend ing be low the frost line is recommended. To avoid
noise and vibration transmission the unit should not be
se cured to the building foundation.
On rooftop locations, choose a place with adequate
struc tur al strength to safely support the entire op er at ing
weight of the unit and service personnel. The unit can
be mount ed on a concrete slab, similar to ground fl oor
locations, or on steel channels of suitable strength. The
channels should be spaced at the same centres as the
vibration mounting holes in the unit base frame and
must be at least 4-3/4" (120 mm) wide at the con tact
points. This will allow vibration isolators to be fi tted
if required.
Any ductwork or attenuators fi tted to the unit must
not have a total static pressure resistance, at full unit
air fl ow, exceeding the capability of the fans installed
in the unit.
INDOOR INSTALLATIONS
The unit can be installed in an enclosed plant room
pro vid ing the fl oor is level and of suitable strength
to sup port the full operating weight of the unit. It is
es sen tial that there is adequate clearance for airfl ow
to the unit. The discharge air from the top of the unit
must be duct ed away to prevent recirculation of air
within the plant room. If common ducts are used for
fans, non-return damp ers must be fi tted to the outlet
from each fan.
The discharge ducting must be properly sized with a
total static pressure loss, together with any intake stat ic
pressure loss, less than the available static pressure
ca pa bil i ty for the type of fan fi tted.
The discharge air duct usually rejects outside the build-
ing through a louver. The outlet must be positioned to
pre vent the air being drawn directly back into the air
in take for the condenser coils, as such recirculation
will affect unit performance.
LOCATION CLEARANCES
Adequate clearances around the unit(s) are required for
the unrestricted airfl ow for the air-cooled con dens er
coils and to prevent recirculation of warm discharge
air back onto the coils. If clearances given are not
main tained, airfl ow restriction or recirculation will
cause a loss of unit performance, an increase in power
con sump tion and may cause the unit to malfunction.
Con sid er ation should also be given to the possibility of
down drafts, caused by ad ja cent buildings, which may
cause recirculation or un even unit airfl ow.
For locations where signifi cant cross winds are ex-
pect ed, such as exposed roof tops, an enclosure of
sol id or lou ver type is recommended to prevent wind
tur bu lence in ter fer ing with the unit airfl ow.
When units are installed in an enclosure, the en clo sure
height should not exceed the height of the unit on more
than one side. If the enclosure is of louvered con struc -
tion the same requirement of static pres sure loss ap plies
as for ducts and at ten u a tors stated above.
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