Technical data

Checking the Isolator Pad Deflection
All isolator pads should be checked for the proper
deflection while checking to see if the unit is level. Each
pad should be deflected approximately 4 mm. 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.
Levelling the Unit
The longitudinal alignment of the unit should be checked
by placing a level on the top centre of the evaporator
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.
4.6 Installing Optional Spring Isolators
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
isolator mounting brackets should be bolted to the unit.
Place the four spring isolators in position. The threaded
adjusting bolts in each isolator should be screwed out of
the isolator until the extended head of the screw fits
snugly into the isolator bracket hole. The unit should be
lowered over the adjusting bolts.
The levelling bolts should now be rotated one (1) turn at
a time, in sequence, until the unit end sheets are clear of
the floor by 22 mm and the unit is level. Check that the
unit is level, both longitudinally and transversely (see
Levelling the Unit). If the levelling 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 levelled, 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
levelling 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 (spring isolator deflection should be
approximately 25 mm).
4.7 Piping Connections
After the unit is levelled (and wedged in place for
optional 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
independently of the unit to avoid strain on the unit and
vibration transmission. 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 utilise the vibration
isolation characteristics of the vibration isolation 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 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
applying heat to anneal the pipe.
If the chiller/cooling water piping needs to be
welded directly to the water pipe nozzles, the
temperature sensors should be removed to
prevent heat damage.
If the piping is annealed to relieve stress, the
inside of the pipe must be cleaned of scale
before it is finally bolted in place.
4-2 160.81-ICOM-GB0 (01/02)
Adjusting
Bolt
Cap
Screw
Shell
End
Sheet
12.7 mm
35 mm
9.5 mm
177.8 mm
177.8 mm
Figure 4.2 Optional Spring Isolators