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JOHNSON CONTROLS
15
FORM 150.63-NM6 (1020)
6. Protection against corrosive environments is avail-
able by supplying the units with either copper fin,
cured phenolic, or epoxy coating on the condenser
coils. The phenolic or epoxy coils should be of-
fered 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 flow.
Recommended clearances for units are given in DIMEN-
SIONS. 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 the air recirculation were to occur.
FOUNDATION
The unit should be mounted on a flat and level foun
-
dation, floor, or rooftop capable of supporting the entire
operating weight of the equipment. See PHYSICAL
DATA for operating weight. If the unit is elevated be-
yond the normal reach of service personnel, a suitable
catwalk must be capable of supporting service personnel,
their equipment, and the compressors.
GROUND LEVEL LOCATIONS
It is important that the units be installed on a substantial
base that will not settle, causing strain on the refrigerant
lines and resulting in possible leaks. A one-piece con-
crete 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 pre-
cautions, such as unit enclosure options, a fenced-in
enclosure, or locking devices on the panels may be advis-
able. Check local authorities for safety regulations.
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
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.
NOISE SENSITIVE LOCATIONS
Efforts should be made to assure that the unit is not
located next to occupied spaces or noise sensitive areas
where noise level would be a problem. The unit noise is
a result of compressor and fan operation. Considerations
should be made utilizing noise levels published in the
YORK Engineering Guide for the specific unit 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, and locate at the proper mounting
point, and adjust per instructions. See Appendix 1.
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 condensing unit.
ELECTRICAL WIRING
Field Wiring
Power wiring must be provided through a fused discon-
nect switch to the unit terminals (or optional molded dis-
connect switch) in accordance with N.E.C. or local code
requirements. Minimum circuit ampacity and maximum
dual element fuse size are given in the ELECTRICAL
DATA tables.
A 120-1-60, 15 amp source must be supplied for the
control panel through a fused disconnect when a control
panel transformer (optional) is not provided. Refer to
Table 7 and Figures 2 - 4.
See Figures 2 - 4 and unit wiring diagrams for field and
power wiring connections. Refer to section on UNIT
OPERATION for a detailed description of operation
concerning unit contacts and inputs.
Liquid Line Solenoid Connections
The field supplied and installed liquid line solenoid
valves should be installed at the evaporator and wired
using 18 AWG minimum wire. Electrical connections
should be made at Terminal Board CTB3. CTB3 is lo-
cated in the power panel on the left side of the power
panel.
Note that power for the solenoid coil is 120 vac
.
Refer to Figure 7 and unit wiring diagram.
1
Summary of Contents for YCUL0045
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