JOHNSON CONTROLS
48
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 2 – INSTALLATION
DUCT SYSTEM
Duct Connection Guidelines
All intake and discharge air duct connection to the
unit may be made directly to the unit. These air duct
connections should be on flexible material and should
be installed so they are sufficiently loose. Duct runs
and transitions must be made carefully to hold friction
loss to a minimum. Avoid short turns, and duct elbows
should contain splitters or turning vanes.
Duct work connected to the fan discharge should run in
a straight line for at least
two
equivalent outlet diame-
ters. Never deadhead the discharge into the flat surface
of a plenum.
Refer to
for available supply and return duct connection
configuration.
Installation of elbows, discharge damper
and other abrupt flow area changes in
-
stalled directly at the fan outlet will cause
system losses. These losses must be taken
into account during the design phase and
must be added to any field measurements.
SOUND AND VIBRATION TRANSMISSION
All roof mounted air handling units generate some
sound and vibration, which may or may not require
some special treatment of the air conditioned space.
The noise generated by the air handling unit is depen-
dent on the speed of the fan, the amount of air the fan
is moving, the fan type and the static efficiency of the
fan. In applications where sound and vibration trans-
missions may be objectionable, good acoustical engi-
neering practices must be incorporated in the system
design.
The YORK YPAL unit is designed for lower sound lev-
els than competitive units by using flexible fan connec-
tions, fan spring isolators, double-wall construction,
multiple fan options, and lower speed and horsepower
fans. For VAV applications, VFDs are used instead of
inlet guide vanes. Additional sound attenuation can be
obtained using compressor sound blankets and field-
supplied sound attenuators when necessary.
TABLE 18 -
SUPPLY AIR DUCT CONNECTION CONFIGURATIONS
UNIT CONFIGURATION
SUPPLY AIR
BOTTOM
LEFT
RIGHT
50-61
TONS
Cooling Only
√
√
√
Cool / Gas Heat 1125 MBH
√
n/a
n/a
Gas Heat not available with External Cabinet
TABLE 19 -
RETURN AIR DUCT CONNECTION CONFIGURATIONS
UNIT CONFIGURATION
SUPPLY AIR
BOTTOM
LEFT
RIGHT
50-61
TONS
No Exhaust
√
√
√
Barometric Relief Damper
√
√
n/a
Powered Exhaust Fan
√
√
n/a
Return Fan
√
n/a
n/a
BOTTOM
FRONT
LEFT
RIGHT
FRONT
Discharge
Return
LD08045
NOTE:
This diagram is provided as a visual reference of the York YPAL discharge and return air openings and locations for all sizes.
Please refer to Figures 5 through 10
for exact size and location of panels and openings.
FIGURE 18 -
DISCHARGE AND RETURN AIR OPENINGS
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