035-19569-101 (0109)
4-2
GB
4.7 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
isolators 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 levelling bolt(s).
Then the unit can be lowered onto the fl oor.
The levelling 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 Figure .2
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 fl oor 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 fi lled with water and checked for leaks. The
levelling bolts should now be fi nally adjusted until the
wedges and shims can be removed. The unit should now
be in correct level position, clear of the fl oor or foundation
and without any effect from the weight of the piping.
4.8 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 fl exibility, 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 fl ange 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.
NOTE
If the piping is annealed to relieve stress, the
inside of the pipe must be cleaned of scale
before it is fi nally bolted in place.
4.9 Evaporator and Condenser Water Piping
The evaporator and condenser liquid heads have
nozzles which are grooved, suitable for welding 1034
kPa DWP fl anges or the use of Victaulic couplings.
Factory mounted fl anges are optional.
The nozzles and water pass arrangements are delivered
in accordance with the job requirements (see Product
Drawings delivered with the job and Section 9). Standard
units are designed for 1034 kPa DWP on the water side.
If job requirements are for greater than 1034 kPa DWP,
check the unit Data Plate before applying pressure to
evaporator or condenser to determine if the chiller has
provisions for the required DWP.
Inlet and outlet connections are identifi ed by labels
placed adjacent to each nozzle.
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