Spring Isolators (Optional); Compressor Mounting; Chilled Liquid Piping - York YLAA0041 Manual

SECTION 4 – INSTALLATION

SPRING ISOLATORS (OPTIONAL)

When ordered, isolators will be furnished. Identify the
isolator, locate at the proper mounting point, and adjust
per instructions.

COMPRESSOR MOUNTING

The compressors are mounted on four rubber isolators.
The mounting bolts should not be loosened or adjusted
at installation of the chiller.

CHILLED LIQUID PIPING

General – When the unit(s) has been located in its fi-
nal position, the unit water piping may be connected.
Normal installation precautions should be observed in
order to receive maximum operating efficiencies. Pip-
ing should be kept free of all foreign matter. All chilled
water evaporator piping must comply in all respects
with local plumbing codes and ordinances.
Since elbows, tees and valves decrease pump capacity,
all piping should be kept as straight and as simple as
possible. All piping must be supported independent
of the chiller.
Consideration should be given to com-
pressor access when laying out water pip-
ing. Routing the water piping too close to
the unit could make compressor servicing/
replacement difficult.
Hand stop valves should be installed in all lines to fa-
cilitate servicing.
Piping to the inlet and outlet connections of the chiller
should include high-pressure rubber hose or piping
loops to ensure against transmission of water pump vi-
bration. The necessary components must be obtained
in the field.
Drain connections should be provided at all low points
to permit complete drainage of the cooler and system
water piping.
A small valve or valves should be installed at the high-
est point or points in the chilled water piping to allow
any trapped air to be purged. Vent and drain connec-
tions should be extended beyond the insulation to make
them accessible.
The piping to and from the cooler must be designed to
suit the individual installation. It is important that the
following considerations be observed:
38
• The chilled liquid piping system should be laid
out so that the circulating pump discharges di-
rectly into the cooler. The suction for this pump
should be taken from the piping system return line
and not the cooler. This piping scheme is recom-
mended, but is not mandatory.
• The inlet and outlet cooler connection sizes are
provided in Table 6 on page 50 (Physical Data).
• A 40-mesh strainer is provided at the cooler inlet
line just ahead of the cooler. This is important to
protect the cooler from entrance of large particles
that could cause damage to the evaporator.
• All chilled liquid piping should be thoroughly
flushed to free it from foreign material before
the system is placed into operation. Use care not
to flush any foreign material into or through the
cooler.
• As an aid to servicing, thermometers and pressure
gauges should be installed in the inlet and outlet
water lines.
• The chilled water lines that are exposed to out-
door ambients should be wrapped with supple-
mental heater cable and insulated to protect
against freeze-up during low ambient periods, and
to prevent formation of condensation on lines in
warm humid locations. As an alternative, ethylene
glycol should be added to protect against freeze-
up during low ambient periods.
• A chilled water flow switch, (either by YORK
or others) MUST be installed in the leaving wa-
ter piping of the cooler. If the factory wired flow
switch and extension pipe kit is not selected, the
field installed flow switch must be installed so that
there is a straight horizontal run of at least 5 diam-
eters on each side of the switch. Adjust the flow
switch paddle to the size of the pipe in which it
is to be installed (refer to the manufacturer's in-
structions furnished with the switch). The switch
is to be wired to Terminals 13 and 14 of XTBC1
located in the control panel, as shown on the unit
wiring diagram.
The Flow Switch MUST NOT be used
to start and stop the chiller (i.e. starting
and stopping the chilled water pump). It
is intended only as a safety switch.
FORM 150.72-ICOM6
ISSUE DATE: 08/03/2022
JOHNSON CONTROLS