Form 155.16-N3 (899), IsoFlow Absorption Chillers with Buffalo ...

INSTALLING THE ABSOLUTE PRESSURE GAUGE
The absolute pressure gauge is shipped separately for
field installation. Mount the gauge on the gauge bracket
which is located on the lower shell of the unit adjacent
to the purge piping. Use #10-24 UNC x 1 inch long flat
head machine screws and #10-24 UNC hex nuts. Make
sure the gauge is absolutely vertical by placing a level
on the side edge of the gauge before tightening the
mounting screws. The gauge can be connected to the
manometer isolation hand valve via tubing. When doing
so, make sure the hand valve is in the closed position.
COMPLETING THE PURGE PUMP CONNECTIONS
The purge pump should already be mounted on the side
of the unit with a special adaptor fitting, tee and ball
valve installed at the discharge port of the purge pump.
The suction port of the purge pump must be connected
to the oil trap canister connection which is located above
the purge pump. As part of the unit ship loose parts,
there should be two hose clamps and a length of wire
reinforced clear 3/4" I.D. tubing. Use this tubing and
clamps to complete the connection between the purge
pump suction port and the oil trap.
DISCHARGE
PORT
YORK INTERNATIONAL
SUCTION
PORT
FIG. 10 – PURGE PUMP
OIL
TRAP
LD04564
UNIT WATER PIPING
FORM 155.16-N3
When the assembly of the unit is complete, and unit is
level, the condenser water and chilled water piping may
be made.
As standard, the unit nozzles will be provided with
victaulic connections suitable for 150 PSIG DWP ANSI
flanges for 150 or 300 PSIG DWP are provided only as
an option. The piping must be installed in accordance
with accepted piping practice and any applicable local
piping codes. Provide adequate temperature and pressure
wells or taps on all supply and return piping.
All water piping must be adequately
supported and braced independent of
the chiller. No strain is to be placed
on the unit nozzles and/or connection
flanges.
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 are not necessary but
may be desirable, and may be required by customer
specifications.
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 piping is annealed to relieve
stress, the inside of the pipe must be
cleaned of scale before it is finally
bolted in place.
Inlet and outlet nozzle connections are identified by labels
placed adjacent to each nozzle. Provide adequate
temperature and pressure wells or taps on all supply
and return piping. A chilled water flow switch is supplied
as a ship loose item, which must be installed in
either the supply or return chilled water circuit close to
the unit. See Fig. 11. YORK highly recommends always
mounting the flow switches in a horizontal length of pipe
with the switch in a vertical position. It is not recommended
to mount the flow switches in a vertical pipe
with an upward flow due to the fact that minimum flow
may not be substantial enough to lift the switch’s paddle.
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