FORM 160.73-N1 (904)
23
YORK INTERNATIONAL
INSTALLATION
RIGGING UNIT TO FINAL LOCATION
Rig the unit to its fi nal location on the fl oor or mount ing
pad, lift the unit (or shell assembly) by means of an
over head lift and lower the unit to its mounting po si tion.
(If op tion al shipping skids are used, remove them be fore
low er ing the chiller to its mounting position.)
At this point units shipped dismantled
should be as sem bled under the su per -
vi sion of a YORK rep re sen ta tive.
If evaporator is to be fi eld insulated, the in su la tion should
be applied to the evaporator before the unit is placed in
po si tion while the unit is in the lift position. Be sure unit
is prop er ly supported. (See IN SU LA TION, page 27.)
LOCATING AND INSTALLING ISOLATOR PADS
(REFER TO FIG. 9 OR 10)
The isolator pad mounts are to be located as shown in
Fig 9 or 10 ( Rubber side down).
After the isolator pads have been placed into position on
the fl oor, lower the chiller onto the pads. When the unit
is in place, remove the rigging equipment and check that
the unit is level. The unit should be level within 1/4"
(6 mm) from one end to the other end and from front
to the rear. If the chiller is not level within the amount
specifi ed, lift it and place shims be tween the isolation
pad and the chiller tube sheets. (Shims furnished by
the in stall er.) Lower unit again and recheck to see that
it is level.
CHECKING THE ISOLATION PAD DEFLECTION
All isolation pads should be checked for the proper
de fl ec tion while checking to see if the unit is level.
Each pad should be defl ected approximately 0.10 inchs
(2.5 mm) to 0.20 inchs (5 mm). If an isolation pad is
under-de fl ect ed, shims should be placed between the
unit tube sheet and the top of the pad to equally defl ect
all pads.
LEVELING THE UNIT
The longitudinal alignment of the unit should be checked
by placing a level on the top center of the evaporator
shell under the compressor/motor assembly. Trans verse
align ment should be checked by placing a level on top
of the shell end sheets.
INSTALLING OPTIONAL SPRING ISOLATORS
(REFER TO FIG. 11 OR 12)
When ordered, spring type isolator assemblies will be
fur nished with the unit. The 4 assemblies are iden ti cal
and can be placed at any of the 4 corners of the unit.
While the unit is still suspended by the rigging, the
iso la tors should be bolted to the unit by inserting the
cap screw(s) through the hole(s) in the mounting bracket
into the tapped hole in the top of the isolator leveling
bolt(s). Then the unit can be lowered onto the fl oor.
The leveling bolts should now be rotated one (1) turn at
a time, in sequence, until the unit end sheets are clear
of the fl oor by the dimension shown in Fig. 11 or 12
and the unit is level. Check that the unit is level, both
lon gi tu di nal ly and trans verse ly (see Leveling the Unit).
If the lev el ing bolts are not long enough to level unit
due to an uneven or slop ing fl oor or foundation, steel
shims (grout ed, if nec es sary) must be added beneath the
iso la tor as sem blies as nec es sary.
After the unit is leveled, wedge and shim under each
cor ner to solidly support the unit in this position while
pip ing con nec tions are being made, pipe hangers ad just ed
and con nec tions checked for alignment. Then the unit is
fi lled with water and checked for leaks. The lev el ing bolts
should now be fi nal ly adjusted until the wedg es and shims
can be removed. The unit should now be in correct level
position, clear of the fl oor or foun da tion and without any
effect from the weight of the pip ing.
PIPING CONNECTIONS
After the unit is leveled (and wedged in place for op tion al
spring isolators) the piping connections may be made;
chilled water, condenser water and refrigerant re lief. The
piping should be arranged with offsets for fl ex i bil i ty, and
ad e quate ly supported and braced in de pen dent ly of the
unit to avoid strain on the unit and vi bra tion trans mis sion.
Hangers must allow for align ment of pipe. Isolators (by
others) in the piping and hangers are highly de sir able,
and may be required by spec i fi ca tions, in or der to
effectively utilize the vi bra tion iso la tion char ac ter is tics
of the vibration isolation mounts of the unit.
Check for piping alignment – Upon completion of
pip ing, a connection in each line as close to the unit as
possible should be opened, by removing the fl ange bolts
or coupling and checked for piping alignment. If any of
the bolts are bound in their holes, or if the connection
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