FORM 100.10-NOM2
17
YORK INTERNATIONAL
FIG. 12 –
STANDARD TIE-DOWN W/SNUBBER FOR
UNIT SIZES CP65 - 305
FIG. 14 –
DOWN DISCHARGE DUCT CONNECTIONS
FIG. 15 –
RECOMMENDED DISCHARGE DUCT
ARRANGEMENT WHEN TURNS ARE
REQUIRED
must be made carefully to hold friction loss to a mini-
mum. Avoid short turns, and duct elbows should con-
tain splitters or turning vanes.
Duct work connected to the fan discharge should run in
a straight line for at least
two
equivalent outlet diam-
eters and should be reduced in cross sectional area (See
Figure 15).
A duct turn should NOT be in the same
direction as the fan rotation.
Never deadhead the
discharge into the flat surface of a plenum.
Installation of elbows, discharge
damper and other abrupt flow area
changes installed directly at the fan
outlet will cause system losses. These
losses must be taken into account dur-
ing the design phase and must be
added to any field measurements.
On curb mounted units with a down discharge, duct
connections are contained within the roof curb. (See
Figure 14 for dimensions.)
SOUND AND VIBRATION TRANSMISSION
All roof mounted air handling units generate some sound
and vibration, that may or may not require some special
treatment of the air conditioned space. The noise gen-
erated by the air handling unit is dependent 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 transmissions may be objec-
tionable, good acoustical engineering practices must be
incorporated in the system design.
LD06334
LD06335
FIG. 13 –
SEISMIC SNUBBER FOR UNIT SIZES
CP350 - 1030
5
4
ISOLATOR RAIL
3
DO NOT REMOVE
STANDARD
GUSSET /TIE-DOWN
1
REMOVE
3 BOLTS
2
DO NOT REMOVE
SNUBBER BOLT
(ADJUST SNUBBER
TO BE FREE FLOATING)
DO NOT REMOVE
SNUBBER GROMMET
WELDED SNUBBER NUT
BLOWER RAIL
ISOLATOR RAIL
STANDARD
SPRING ISOLATOR
4
5
7
ISOLATOR HAT
(NOT USED IN CP860 & 1030)
6
GUSSET TIE-DOWN
(WELDED)
3
2
1
REMOVE BOLTS AND
ANY SPACERS FOUND
BETWEEN GUSSET AND
BLOWER RAIL
SNUBBER GUSSET
(WELDED)
DO NOT REMOVE
SNUBBER BOLT
(ADJUST SNUBBER TO BE
FREE FLOATING)
DO NOT REMOVE
SNUBBER GROMMET (RUBBER)
SNUBBER NUT (WELDED)
SNUBBER JAMB NUT (LOCK
AFTER ADJUSTMENT FOR FREE
FLOATING BLOWER BASE)
NOTE: ADJUST SNUBBER TO BE FREE FLOATING
LD06499
LD06500
2
