JOHNSON CONTROLS
98
Application Data
UNIT LOCATION
The YCAL chillers are designed for outdoor installation.
When selecting a site for installation, be guided by the
following conditions:
1.
For outdoor locations of the unit, select a place
having an adequate supply of fresh air for the con-
denser.
2. Avoid locations beneath windows or between
structures where normal operating sounds may be
objectionable.
3. Installation sites may be either on a roof, or at ground
level. (See FOUNDATION.)
4. The condenser fans are the propeller-type, and
are not recommended for use with duct work in the
condenser air stream.
5. When it is desirable to surround the unit(s), it is
recommended that the screening be able to pass
the required chiller CFM without exceeding 0.1" of
water external static pressure.
6. Protection against corrosive environments is avail-
able by supplying the units with either copper n,
cured phenolic, or epoxy coating on the condenser
coils. The phenolic or epoxy coils should be offered
with any units being installed at the seashore or
where salt spray may hit the unit.
In installations where winter operation is intended and
snow accumulations are expected, additional height
must be provided to ensure normal condenser air
ow.
Recommended clearances for units are given in DI-
MENSIONS. When the available space is less, the
unit(s) must be equipped with the discharge pressure
transducer option to permit high pressure unloading in
the event that air recirculation were to occur.
FOUNDATION
The unit should be mounted on a at and level foun-
dation, ground or roof, capable of supporting the entire
operating weight of the equipment. Operating weights
are given in the PHYSICAL DATA tables.
ROOF 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 during installation. If the roof is
“bonded”, consult the building contractor or architect
for special installation requirements. Roof installations
should incorporate the use of spring-type isolators to
minimize the transmission of vibration into the building
structure.
GROUND LEVEL INSTALLATIONS – It is important that
the units be installed on a substantial base that will not
settle, causing strain on the liquid lines and resulting in
possible leaks. A one-piece concrete slab with footers
extending below the frost line is highly recommended.
Additionally, the slab should not be tied to the main
building foundation as noises will telegraph.
Mounting holes (11/16" diameter) are provided in the
steel channel for bolting the unit to its foundation. See
DIMENSIONS.
For ground level installations, precautions should be
taken to protect the unit from tampering by or injury
to unauthorized persons. Screws on access panels
will prevent casual tampering; however, further safety
precautions, such as unit enclosure options, a fenced-in
enclosure, or locking devices on the panels may be ad-
visable. Check local authorities for safety regulations.
C
HILLED LIQUID PIPING
The chilled liquid piping system should be laid out so
that the circulating pump discharges into the cooler.
The inlet and outlet cooler liquid connections are given
in DIMENSIONS.
Hand stop valves are recommended for use in all lines
to facilitate servicing. Drain connections should be
provided at all low points to permit complete drainage
of the cooler and system piping. Additionally, a strainer
(40 mesh) is recommended for use on the INLET line
to the cooler.
Pressure gauge connections are recommended for
installation in the inlet and outlet water lines. Gauges
are not furnished with the unit and are to be furnished
by other suppliers.
The chilled liquid lines that are exposed to outdoor am-
bients should be wrapped with a supplemental heater
cable and covered with insulation. As an alternative,
ethylene glycol should be added to protect against
freeze-up during low ambient periods.
A ow switch is available as an accessory on all units.
The ow switch (or its equivalent) must be installed in
the leaving water piping of the cooler and must not be
used to start and stop the unit.
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