Spring Isolators (Optional); Compressor Mounting; Pipework Arrangement; Ductwork Connection - York YLUA0078 Installation Operation & Maintenance

SECTION 4 – INSTALLATION
Noise Sensitive Locations
Efforts should be made to ensure that the unit is not
located next to occupied spaces or noise sensitive areas
where unit noise level would be a problem. Unit noise
is a result of compressor and fan operation. Consider-
ations should be made utilizing noise levels published
in the YORK Engineering Guide for the specific con-
densing unit model. Sound blankets for the compres-
sors and low sound fans are available.
Snow Load
In installations where winter operation is intended and
snow accumulations are expected, additional height
must be provided to ensure normal condenser air flow.
Clearances
Recommended clearances for units are given in Di-
mensions (English).
Corrosive Environments
Protection against corrosive environments is available
by supplying the units with either copper fin, 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.

SPRING ISOLATORS (OPTIONAL)

When ordered, four isolators are 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.

PIPEWORK ARRANGEMENT

The following are suggested pipework arrangements
for single unit installations, for multiple unit installa-
tions, each unit should be piped as shown.
32

DUCTWORK CONNECTION

Recommendations of the Building Services Research
Association.
General Requirements
The following ductwork recommendations are intend-
ed to ensure satisfactory operation of the unit. Failure
to follow these recommendations could cause damage
to the unit, or loss of performance, and may invalidate
the warranty.
When ducting is to be fitted to the fan discharge it is
recommended that the duct should be the same cross-
sectional area as the fan outlet and straight for at least 3
ft (1 m) to obtain static regain from the fan. Ductwork
should be suspended with flexible hangers to prevent
noise and vibration being transmitted to the structure.
A flexible joint is also recommended between the duct
attached to the fan and the next section for the same
reason. Flexible connectors should not be allowed to
concertina.
The unit(s) is not designed to take structural loading.
No significant amount of weight should be allowed to
rest on the fan outlet flange, deck assemblies or con-
denser coil module. No more than 3 ft (1 m) of light
construction ductwork should be supported by the unit.
Where cross winds may occur, any ductwork must be
supported to prevent side loading on the unit.
If the ducts from two or more fans are to be combined
into a common duct, back-flow dampers should be fit-
ted in the individual fan ducts. This will prevent re-
circulation of air when only one of the fans is running.
Units are supplied with outlet guards for safety and to
prevent damage to the fan blades. If these guards are
removed to fit ductwork, adequate alternative precau-
tions must be taken to ensure persons cannot be harmed
or put at risk from rotating fan blades.

WIRING

Condensing Units are shipped with all factory-mount-
ed controls wired for operation.
Field Wiring – Power wiring must be provided
through a fused disconnect switch to the unit terminals
(or optional molded disconnect switch) in accordance
with N.E.C. or local code requirements. Minimum cir-
cuit ampacity and maximum dual element fuse size are
given in Table 9 on page 45.
FORM 150.73-NM1
ISSUE DATE: 09/04/2020
JOHNSON CONTROLS