
JOHNSON CONTROLS 19
FORM 160.76-N1
ISSUE DATE: 06/21/2019
2
SECTION 2 - INSTALLATION
RIGGING UNIT TO FINAL LOCATION
Rig the unit to its final location on the floor or mount-
ing pad, lift the unit (or shell assembly) by means of an
overhead lift, and lower the unit to its mounting posi-
tion. If optional shipping skids are used, remove them
before lowering the chiller to its mounting position.
At this point units shipped dismantled
should be assembled under the supervi-
sion of a Johnson Controls representative.
If the evaporator is to be field insulated, apply the insu-
lation to the evaporator before the unit is placed in po-
sition while the unit is in the lift position. Be sure unit
is properly supported. (See Figure 4 on page 13)
LOCATING AND INSTALLING ISOLATOR PADS
Install the isolator pad mounts in the location shown in
Figure 5 on page 14 (rubber side down).
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 tube sheets. (Shims
furnished by the installer.) Lower unit again and re-
check to see that it is level.
CHECKING THE ISOLATION PAD DEFLECTION
Check all isolation pads for the proper deflection
while also checking to see if the unit is level. Each pad
must be deflected approximately 0.10 in. (2.5 mm) to
0.20 in. (5 mm). If an isolation pad is under-deflected,
shims must 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
evaporator shell under the compressor/motor assem-
bly. Transverse alignment should be checked by plac-
ing a level on top of the shell end sheets.
INSTALLING OPTIONAL SPRING ISOLATORS
When ordered, spring type isolator assemblies are fur-
nished 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
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 adjusting 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 Figure
7 on page 16 and the unit is level. Check that the
unit is level, both longitudinally and transversely (see
Leveling the Unit). If the leveling 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 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 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
vibration transmission. The hangers must allow for
alignment of pipe. Isolators (by others) in the piping
and hangers are highly desirable, and may be required
by specifications, in order to effectively utilize the vi-
bration isolation characteristics of the vibration isola-
tion mounts of the unit.
Check for piping alignment – Upon completion of
piping, 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