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YORK INTERNATIONAL

FOUNDATION

The unit should be mounted on a flat and level founda-
tion, 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 person-
nel, their equipment, and the compressors.

GROUND LEVEL LOCATIONS

It is important that the units be installed on a substan-
tial base that will not settle. A one piece concrete slab
with footers extended below the frost line is highly rec-
ommended. Additionally, the slab should not be tied to
the main building foundations as noise and vibration
may be transmitted. Mounting holes 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 and/or latches on access
panels will prevent casual tampering. However, further
safety precautions such as a fenced-in enclosure or lock-
ing devices on the panels may be advisable.

ROOFTOP LOCATIONS

Choose a spot with adequate structural strength to safely
support the entire weight of the unit and service per-
sonnel. Care must be taken not to damage the roof.

Consult the building contractor or architect if the roof
is bonded. Roof installations should have rubber, or vi-
bration isolators under the base to minimize vibration.

NOISE SENSITIVE LOCATIONS

Efforts should be made to assure that the unit is not
located next to occupied spaces or noise sensitive ar-
eas where noise level would be a problem. The unit
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
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 isola-
tors. The mounting bolts should not be loosened or ad-
justed 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
disconnect switch) in accordance with N.E.C. or local
code requirements. Minimum circuit ampacity and maxi-
mum dual element fuse size are given in the ELECTRI-
CAL DATA tables.

A 120-1-60, 15 amp source must be supplied for the
control panel through a fused disconnect when a con-
trol panel transformer (optional) is not provided. Refer
to Table 6 and Figures 2 - 4.

See Figures 1 - 4 and unit wiring diagrams for field and
power wiring connections. Refer to section on UNIT
OPERATION for a detailed description of operation con-
cerning 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 right side of the panel.
Note that power for the solenoid coil is 120 VAC.
Refer to Figure 7 and unit wiring diagram.

Discharge Air Sensor

The discharge air sensor and associated connector hard-
ware is factory supplied but must be field installed. Field

Installation