York Millenium YK D Series, Руководство по установке, Страница: 22 / 28

22 YORK INTERNATIONAL
INSTALLATION
RIGGING UNIT TO FINAL LOCATION
Rig the unit to its final location on the floor or mounting
pad, lift the unit (or shell assembly) by means of an
overhead lift and lower the unit to its mounting position.
(If optional shipping skids are used, remove them be-
fore lowering the chiller to its mounting position.)
NOTE: At this point units shipped dismantled should be
assembled under the supervision of a YORK
representative.
If cooler is to be field insulated, the insulation should be
applied to the cooler before the unit is placed in posi-
tion while the unit is in the lift position. Be sure unit is
properly supported. (See INSULATION, page 26.)
LOCATING AND INSTALLING ISOLATOR PADS
(REFER TO FIG. 5)
The isolator pad mounts are to be located as shown in
Fig 5.
After the isolator pads have been placed into position
on the floor, lower the chiller onto the pads. When the
unit is in place, remove the rigging equipment and check
that the unit is level both longitudinally and transversely.
The unit should be level within 1/4" from one end to the
other end and from front to the rear. If the chiller is not
level within the amount specified, lift it and place shims
between the isolation pad and the chiller tube sheets.
(Shims furnished by the installer.) 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-
flection while checking to see if the unit is level. Each
pad should be deflected approximately 0.15 inch. If an
isolation pad is under-deflected, shims should be placed
between the unit tube sheet and the top of the pad to
equally deflect all pads.
LEVELING THE UNIT
The longitudinal alignment of the unit should be checked
by placing a level on the top center of the cooler shell
under the compressor/motor assembly. Transverse
alignment should be checked by placing a level on top
of the shell end sheets at each end of the chiller.
INSTALLING OPTIONAL SPRING ISOLATORS
(REFER TO FIG. 6)
When ordered, 4 spring type isolator assemblies will be
furnished with the unit. The 4 assemblies are identical
and can be placed at any of the 4 corners of the unit.
While the unit is still suspended by the rigging, the iso-
lators 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 floor.
The leveling bolts should now be rotated one (1) turn at
a time, in sequence, until the unit end sheets are clear
of the floor by the dimension shown in Fig. 6 and the
unit is level. Check that the unit is level, both longitudi-
nally and transversely (see Leveling the Unit). If the lev-
eling bolts are not long enough to level unit due to an
uneven or sloping floor or foundation, steel shims
(grouted, if necessary) must be added beneath the iso-
lator assemblies as necessary.
After the unit is leveled, wedge and shim under each
corner to solidly support the unit in this position while
piping connections are being made, pipe hangers ad-
justed and connections checked for alignment. Then
the unit is filled with water and checked for leaks. The
leveling bolts should now be finally adjusted until the
wedges and shims can be removed. The unit should
now be in correct level position, clear of the floor or
foundation and without any effect from the weight of the
piping.
PIPING CONNECTIONS
After the unit is leveled (and wedged in place for op-
tional spring isolators) the piping connections may be
made; chilled water, condenser water and refrigerant
relief. The piping should be arranged with offsets for
flexibility, and adequately supported and braced inde-
pendently of the unit to avoid strain on the unit and vi-
bration transmission. Hangers must allow for alignment
of pipe. Isolators (by others) in the piping and hangers
are highly desirable, and may be required by specifica-
tions, in order to effectively utilize the vibration isolation
characteristics 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 flange bolts
or coupling and checked for piping alignment. If any of
the bolts are bound in their holes, or if the connection
springs are out of alignment, the misalignment must be
corrected by properly supporting the piping or by apply-
ing heat to anneal the pipe.
NOTE: If the piping is annealed to relieve stress, the
inside of the pipe must be cleaned of scale be-
fore it is finally bolted in place.