Rooftop Locations; Noise Sensitive Locations; Spring Isolators (Optional); Compressor Mounting - York YCAL0019 Installation, Operation And Maintenance Manual

SECTION 4 – INSTALLATION

Rooftop Locations

Choose a spot with adequate structural strength to
safely support the entire weight of the unit and service
personnel. Care must be taken not to damage the roof.
Consult the building contractor or architect if the roof is
bonded. Roof installations should have wooden beams
(treated to reduce deterioration), cork, rubber, or vibra-
tion isolators under the base to minimize vibration.

Noise Sensitive Locations

Efforts should be made to assure that the chiller is not
located next to occupied spaces or noise sensitive areas
where chiller noise level would be a problem. Chiller
noise is a result of compressor and fan operation. Con-
siderations should be made utilizing noise levels pub-
lished in the YORK Engineering Guide for the specific
chiller model. Sound blankets for the compressors and
low sound fans are available.

SPRING ISOLATORS (OPTIONAL)

When ordered, four (4) 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 (4) rubber iso-
lators. The mounting bolts should not be loosened or
adjusted at installation of the chiller.

REMOTE COOLER OPTION

Not available at this time.

CHILLED LIQUID PIPING

When the unit(s) has been located in its final position,
the unit water piping may be connected. Normal instal-
lation precautions should be observed in order to re-
ceive maximum operating efficiencies. Piping should
be kept free of all foreign matter. All chilled water
evaporator piping must comply in all respects with lo-
cal 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
piping. Routing the water piping too
close to the unit could make compres-
sor servicing/replacement difficult.
40
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:
1. 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
recommended, but is not mandatory.
2. The inlet and outlet cooler connection sizes are 3"
(YCAL0043 to YCAL0066).
3. A strainer, preferably 40 mesh, must be installed
in the cooler inlet line just ahead of the cooler.
This is important to protect the cooler from en-
trance of large particles which could cause dam-
age to the evaporator.
4. 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.
5. As an aid to servicing, thermometers and pressure
gauges should be installed in the inlet and outlet
water lines.
6. The chilled water lines that are exposed to outdoor
ambients should be wrapped with supplemen-
tal heater cable and insulated to protect against
freeze-up during low ambient periods, and to pre-
vent formation of condensation on lines in warm
humid locations.
7. A chilled water flow switch, (either by YORK or
others) must be installed in the leaving water pip-
ing of the cooler. There should be a straight hori-
zontal run of at least 5 diameters on each side of
the switch. Adjust the flow switch paddle to the
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
JOHNSON CONTROLS