York R-407C Optimized Manual
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YORK INTERNATIONAL
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YORK INTERNATIONAL
FORM 201.19-EG4
Application Data
APPLICATION DATA:
The YORK YCAS air cooled chillers are designed for
outdoor installation. When selecting a site for installation,
be guided by the following requirements:
1. Installation sites may be either on a roof or ground
level. (See FOUNDATION)
2. Select a place having an adequate supply of fresh air
for the condensers. Recommended clearances for all
units are shown on the DRAWINGS pages.
3. Avoid locations near windows or structures where
normal operating sounds may be objectionable.
4. The standard condenser fans are not recommended
for use with ductwork, lters, or other resistance in
the condenser air stream.
5. When it is desirable to surround the unit, it is rec-
ommended that the screening be able to pass the
required chiller cfm without exceeding 0.1" external
static pressure.
6. Condenser damage from corrosive environments can
be inhibited by providing either copper ns, or cured
epoxy coating on the condenser coils. The cured
phenolic or epoxy coated coils are recommended
for units installed near seashore, or where salt spay
may hit the unit, or where acid rain is prevalent (cop-
per n coils are not recommended where they may
be exposed to acid rain).
7. On installations where winter operation is intended
and snow accumulations expected, additional ele-
vation must be provided to ensure normal condenser
air ow.
FOUNDATION
The unit should be mounted on a at, level foundation,
ground or roof, capable of supporting the entire oper-
ating weight of the equipment as given in the PHYSICAL
DATA tables.
Roof Locations – Adequate structural strength to
safely support the entire weight of the unit and service
personnel must be provided. Care must be taken not to
damage the roof during installation. If the roof is “bond-
ed,” consult building contractor or architect for special
installation requirements. Roof installations should in-
corporate the use of isolators to minimize transmission
of vibration into the building structure. Additional support
should be provided to the roof at the isolator locations.
Ground Locations – Units must be installed on a sub-
stantial base that will not settle and cause strain on the
refrigerant lines, which could result in leaks. A one-piece
concrete slab, with footers extending below the frost line
is recommended. The slab should not be connected to
the main building foundation to avoid noise and vibration
transmission.
Mounting holes (0.625" or 16 mm diameter) are provided
in the base rails for bolting the unit to its foundation (See
DIMENSIONS)
For ground installations, take precautions to prevent
tampering by, or injury to, unauthorized persons. Fas-
teners on access panels will prevent casual tamper-
ing, however further safety precautions, such as unit
enclosure options, a fence, or locking devices on the
panels may be advisable. Check local authorities for
safety regulations.
CHILLED LIQUID PIPING
The chilled liquid piping system should be laid out so
the circulating pump discharges into the cooler. The
inlet and outlet cooler liquid connections are given in
DIMENSIONS. Hand stop valves are recommended in
all lines to facilitate servicing. Drain and vent connections
should be provided to permit complete drainage of the
cooler and system piping.
A strainer (40 mesh) is recommended for use on the
INLET line to the cooler, and must be in place upon initial
operation of the water pumps. Anti-vibration couplings
should be considered to inhibit noise and vibration
transmission into the occupied space. Pressure gauge
connections are recommended for installation in the inlet
and outlet water lines. Gauges are not provided with the
units and are by others.
Chilled liquid lines exposed to the weather should be
wrapped with a supplemental heater cable and insu-
lated, or glycol should be added to the chilled liquid
to protect against freezing if low ambient periods are
expected.
A ow switch (available as an accessory) must be in-
stalled in the leaving water piping of the cooler and must
not be used to start and stop the unit.