Piping Connections; Check For Piping Alignment - York MILLENNIUM YS Manual

The adjusting bolts should now be rotated one (1) turn
at a time, in sequence, until the unit end sheets are about
7/8 inch (22mm) off the floor or foundation, and the unit
is level. Check the level of the unit both longitudinally
and transversly. If the adjusting bolts are not long enough
to level the 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 can be filled with water and checked for leaks. The
adjusting bolts should now be finally adjusted and 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. When the unit is properly supported, spring
isolator deflection should be approximately 1 inch
(25mm).

PIPING CONNECTIONS

After the unit is leveled (and wedged in place for op-
tional spring isolators) the piping connections may be
fabricated; chilled water, condenser water and refriger-
ant relief. The piping should be arranged with offsets
for flexibility, and adequately supported and braced in-
dependently of the unit to avoid strain on the unit and
vibration transmission. Hangers must allow for align-
ment of pipe. Isolators (by others) in the piping and hang-
ers are highly desirable, and may be required by speci-
fications. This is done to effectively utilize the vibration
isolation characteristics of the isolator mounts on the
unit.
YORK INTERNATIONAL

CHECK FOR PIPING ALIGNMENT

When piping is complete, check for alignment try open-
ing a connection in each line, as close to the unit as
possible, by removing the flange bolts or coupling. If
any of the bolts are bound in their holes, or if the con-
nection springs are out of alignment. The misalignment
must be corrected by properly supporting the piping or
by applying heat to anneal the pipe.
It may be necessary to weld chilled
water piping directly to the water pipe
nozzles. Since chiller water tempera-
ture sensor wells are often in close
proximity to these connection points,
sensors in the wells may often see tem-
peratures of several hundred degrees.
We have reason to believe that some
potential exists for damaging these
sensors from the transferred heat. Any
damage will most likely show up as
error in the sensor.
It is advisable to remove the sensors
from the wells during the welding pro-
cess as a precautionary measure. If the
sensor is removed, assure that it bot-
toms out when it is placed back in the
well.
This same precaution should also be
observed whenever condenser water
temperature sensors are present in the
chiller system and condenser water
piping is to be welded to the chiller.
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.
FORM 160.47-NOM3
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