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271846-YTG-B-0208
4 Johnson Controls Unitary Products
FACTORY INSTALLED
OVERSIZED EVAPORATOR FAN MOTORS
Increased horsepower motors and drive components are
available for those applications where external static pres-
sure requirements exceed the capability of the standard
motor.
CORROSION RESISTANT COATINGS
Evaporator coil shall receive a 1-mil thickness of a cathodic
epoxy type electro-deposition coating, applied in a multiple
dip and bake process.
STAINLESS STEEL DRAIN PAN
Evaporator coil (and optional Water Side Economizer coil)
drain pan shall be fabricated 304 stainless steel material The
3/4 in NPT drain connection fitting is also of 304 stainless
steel.
HOT GAS BYPASS
Adjustable hot gas regulator and all necessary piping shall be
installed on lead compressor circuit. Bypass capacity shall be
minimum 50% of compressor capacity. The bypass valve
opens at a preset suction pressure to prevent coil freeze-up
at light evaporator load, or low airflow conditions. The use of
factory installed Condenser Pressure Control option is
strongly recommended when Hot Gas Bypass is installed.
ANTI-SHORT CYCLE TIMER
Time delay relay will be provided for each compressor circuit.
Compressor will be lock out for 5 minutes when thermostat
contacts open, or there is a momentary power outage.
FIELD INSTALLED
WATER SIDE ECONOMIZER
Commercial Water Cooled Air Conditioners can achieve sub-
stantial operating cost reductions by utilizing the cooling
effect made available by low temperature water. The Water-
side Economizer Kit consists of a field installed water cooling
coil, pre-assembled external piping sections, a three-way
motorized valve, and all necessary controls for unit operation
from a conventional 24-Volt thermostat.
HOT WATER & STEAM COILS
Hydronic heating coils shall mount on return air side of cool-
ing coil.
RETURN AIR GRILL
Available on 5-15 ton CU models only. Recommended for
applications where return air is not ducted and air is drawn
directly from the conditioned space.
DISCHARGE PLENUM
Plenums mount on top of the evaporator section, with fans
arranged for vertical discharge. Double deflection grills shall
allow air discharge in multiple directions.
OVERSIZED EVAPORATOR FAN MOTORS
Increased horsepower motors and drive components are
available as a kit. Units are field upgradeable for applications
where external staic pressure requirements exceed the capa
-
bility of the standard motor.
CONDENSER PRESSURE CONTROL
Water regulating valves provide control of the quantity of con-
denser water supplied to the unit by sensing the condensing
temperature. The field installed Condenser Control Option
provides a regulating valve for each internal condenser water
circuit. Standard Water Regulating Valve carries a 150 psig
working pressure rating. The valve is installed inside of the
unit cabinet.