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Installation and reassembly
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 before lowering the chiller to its mounting position.)
Note: Units shipped dismantled should be assembled under the supervision of a Johnson
Controls representative.
If the evaporator is to be field insulated, the insulation should be applied to the evaporator before
the unit is placed in position while the unit is in the lift position. Be sure unit is properly supported.
Locating and installing isolator pads
See Figure 12 through Figure 19.
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. The unit
should be level within 1/4 in. (6 mm) 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 end 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 deflection while checking to see if the unit
is level. Each pad should be deflected approximately 0.10 in. (2.5 mm) to 0.20 in. (5 mm). If an
isolation pad is under-deflected, shims should be placed between the unit end 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
evaporator shell. Transverse alignment should be checked by placing a level on top of the shell end
sheets.
Installing optional spring isolators
See Figure 20. When ordered, spring type isolator assemblies will be furnished with the unit. The
spring assemblies are identical and can be placed at any of the corners of the unit.
While the unit is still suspended by the rigging, the isolators should be bolted to the unit by
inserting the cap screws through the holes in the mounting bracket into the tapped hole in the top
of the isolator leveling bolts. Then the unit can be lowered onto the floor.
The leveling bolts should now be rotated one turn at a time, in sequence, until the unit end sheets
are clear of the floor by the dimension shown in Figure 20 and the unit is level. Check that the unit
is level, both longitudinally and transversely (see
long enough to level unit due to an uneven or sloping floor or foundation, steel shims (grouted, if
necessary) must be added beneath the isolator 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 adjusted 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.
Centrifugal Liquid Chillers
Leveling the
unit). If the leveling bolts are not
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