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73SS-PRC003-EN
Mechanical
Specifications Condensing Units
FACTORY INSTALLED ACCESSORIES
Black Epoxy Coated Condenser Coil —
This option is designed to provide
corrosion protection of air cooled
condenser coils for seacoast
application. The black epoxy coil
protection is a factory applied
thermoset vinyl coating, bonded to
normal aluminum fin stock. The uniform
thickness of the bonded vinyl layer
exhibits excellent corrosion protection
in salt spray tests performed in
accordance with ASTM B177.
ACCESSORIES
Low Ambient Head Pressure Control —
Shall modulate the RPM of unit outdoor
fan motor in response to outdoor
ambient temperature and discharge line
pressure. Accessory provides unit
cooling operation to outdoor
temperatures of 0F.
Vibration Isolation Packages — Shall
reduce transmission of noise and
vibration to building structures,
equipment and adjacent spaces.
Packages shall be available in either
neoprene-in-shear or spring-flex types.
Hot Gas Bypass Kit — Shall be
available to provide capacity
modulation.
Time Delay Relay — Shall prevent
compressors in dual compressor unit
from coming on line simultaneously.
Timer shall be 24-volt, 60 cycle, with
four minute timing period.
Anti-Short-Cycle Timer — Shall prevent
rapid on-off compressor cycling in light
load conditions by not allowing
compressor to operate for
5-7 minutes upon shutdown. Shall
consist of a solid state timing device, 24-
volt, 60 cycle with either 5 or 7 minute
fixed-off timing period.
Condenser Coil Guard — Metal grille
with PVC coating shall be provided to
alleviate coil damage.
Controls
Condensing units shall be completely
factory wired with necessary controls
and contactor pressure lugs or terminal
block for power wiring. Unit shall
provide an external location for
mounting a fused disconnect device.
A choice of microprocessor or electro-
mechanical controls shall be available.
The 24-volt electro-mechanical control
circuit shall include control transformer
and contactor pressure lugs for power
wiring. Units shall have single point
power entry as standard.
The microprocessor controls shall
provide for all 24-volt control functions.
The resident control algorithms shall
make all heating, cooling and/or
ventilating decisions in response to
electronic signals from sensors
measuring indoor and outdoor
temperatures. The control algorithm
maintains accurate temperature
control, minimizes drift from set point,
and provides better building comfort. A
centralized microprocessor shall
provide anti-short cycle timing and time
delay between compressors to provide
a higher level of machine protection.
Time delay timers shall be provided to
help prevent compressors in dual
compressor units from simultaneous
start-up. An anti-short cycle timer shall
be available as an optional accessory.
Zone Sensor
This field installed control shall be
provided to interface with the Micro
equipped units and shall be available in
either manual, automatic programmable
with night setback, with system
malfundtion lights, or remote sensor
options.
Thermostat
Two stage heating and cooling operation
or one stage heating and cooling shall be
available for field installation in either
manual or automatic changeover.
Automatic programmable electronic with
night setback shall also be available.
LonTalk® Communication Interface
This factory or field installed option shall
be provided to allow the unit to communi-
cate as aTracer™ LCI-R device or directly
with generic LonTalk Network Building
Automation System Controls.
Low Ambient Operation
Standard units shall start and operate to
approximately 50°F when matched with
air handlers and coils. Optional head
pressure control accessory permits
operation to 0°F.