246824-YTG-G-1208
12
Johnson Controls Unitary Products
d. Flame proving controls. Unit shall have two independent
stages of capacity (60% 1
st
stage, 100% 2
nd
stage).
ELECTRIC HEATING SECTION (IF EQUIPPED)
An electric heating section, with nickel chromium elements,
shall be provided in a range of 9 thru 54 KW, offering two states
of capacity all sizes. The heating section shall have a primary
limit control(s) (automatic reset) to prevent the heating element
system from operating at an excessive temperature. The Heat-
ing Section assembly shall slide out of the unit for easy mainte-
nance and service. Units with Electric Heating Sections shall be
wired for a single point power supply with branch circuit fusing
(where required).
UNIT OPERATING CHARACTERISTICS
Unit shall be capable of starting and running at 125 ºF outdoor
temperature, exceeding maximum load criteria of ARI Standard
340/360. The compressor, with standard controls, shall be
capable of operation down to 0 ºF outdoor temperature. Unit
shall be provided with fan time delay to prevent cold air delivery
before heat exchanger warms up. (Gas heat only)
ELECTRICAL REQUIREMENTS -
All unit power wiring shall
enter unit cabinet at a single factory provided location and be
capable of side or bottom entry to minimize roof penetrations
and avoid unit field modifications. Separate side and bottom
openings shall be provided for the control wiring.
STANDARD LIMITED WARRANTIES
-
Compressor – 5 Years,
Heat Exchanger – 10 Years, Elect. Heat Elem. – 5 Years,
Parts – 1 Year
FACTORY INSTALLED OPTIONAL OUTDOOR AIR
(Shall be
made available by either/or):
•
ELECTRONIC ENTHALPY AUTOMATIC ECONOMIZER
– Outdoor and return air dampers that are interlocked and
positioned by a fully-modulating, spring-return damper
actuator. The maximum leakage rate for the outdoor air
intake dampers shall not exceed 2% when dampers are
fully closed and operating against a pressure differential
of 0.5 IWG. A unit-mounted potentiometer shall be
provided to adjust the outdoor and return air damper
assembly to take in outdoor air to meet the minimum
ventilation requirement of the conditioned space during
normal operation. During economizer operation, a mixed-
air temperature control shall modulate the outdoor and
return air damper assembly to prevent the supply air
temperature from dropping below 55 ºF. Changeover from
compressor to economizer operation shall be provided by
an integral electronic enthalpy control that feeds input into
the basic module. The outdoor intake opening shall be
covered with a rain hood that matches the exterior of the
unit. Water eliminator/filters shall be provided.
Simultaneous economizer/compressor operation is also
possible. Dampers shall fully close on power loss.
Available with barometric relief or power exhaust.
•
MOTORIZED OUTDOOR AIR DAMPERS
– Outdoor and
return air dampers that are interlocked and positioned by
a 2-position, spring-return damper actuator. The
maximum leakage rate for the outdoor air intake dampers
shall not exceed 2% when dampers are fully closed and
operating against a pressure differential of 0.5 IWG. A
unit-mounted potentiometer shall be provided to adjust
the outdoor and return air damper assembly to take in the
design CFM of outdoor air to meet the ventilation
requirements of the conditioned space during normal
operation. Whenever the indoor fan motor is energized,
the dampers open up to one of two pre-selected positions
– regardless of the outdoor air enthalpy. Dampers return
to the fully closed position when the indoor fan motor is
de-energized. Dampers shall fully close on power loss.
ADDITIONAL FACTORY INSTALLED OPTIONS
•
ALTERNATE INDOOR BLOWER MOTOR
– For
applications with high restrictions, units are available with
optional indoor blower motors that provide higher static
output and/or higher airflow.
•
CONVENIENCE OUTLET (POWERED/NON-POWERED)
–
Unit can be provided with an optional 120VAC GFCI outlet
with cover on the corner of the unit housing the compressors.
•
ELECTRIC HEAT
- Electric Heaters range from 9 kW to
54 kW and are available in all the voltage options of the
base unit.
•
PHASE MONITOR
- Designed to prevent damage in out-
of-phase condition.
•
COIL GUARD
- Designed to prevent condenser coil
damage.
•
BAS CONTROLS
- Include supply air sensor, return air
sensor, dirty filter indicator and air proving switch.
•
DIRTY FILTER SWITCH
– This kit includes a differential
pressure switch that energizes the fault light on the unit
thermostat, indicating that there is an abnormally high-
pressure drop across the filters.
•
BREAKER
– An HACR breaker can be factory installed
on gas heat units or cooling units with electric heat.
•
DISCONNECT SWITCH
- A disconnect can be factory
installed on a cooling only units sized for the largest
electric heat available.
•
STAINLESS STEEL HEAT EXCHANGER
– For
applications in a corrosive environment, this option
provides a full stainless steel heat exchanger assembly.
•
SMOKE DETECTOR
– A smoke detector can be factory
mounted and wired in the supply and/or return air
compartments.
OTHER PRE-ENGINEERED ACCESSORIES AVAILABLE
•
ROOF CURB
- 14” and 8” high, full perimeter knockdown
curb, with hinged design for quick assembly.
•
BAROMETRIC RELIEF DAMPER
– (Unit mounted –
Downflow, Duct Mounted – Horizontal) – Contains a rain
hood, air inlet screen, exhaust damper and mounting
hardware. Used to relieve internal air pressure through
the unit during economizer operation.
