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528150-YTG-G-1210
14 Johnson Controls Unitary Products
g. Control board shall monitor each refrigerant safety switch
independently.
h. Control board shall retain last 5 fault codes in non-
volatile memory, which will not be lost in the event of a
power loss.
GAS HEATING SECTION (IF EQUIPPED)
Heat exchanger and exhaust system shall be constructed of
aluminized steel and shall be designed with induced draft com-
bustion with post purge logic, energy saving direct spark igni-
tion, and redundant main gas valve. The heat exchanger shall
be of the tubular type, constructed of T1-40 aluminized steel for
corrosion resistance and allowing minimum mixed air entering
temperature of 40 ºF. Burners shall be of the in-shot type, con-
structed of aluminum-coated steel. All gas piping shall enter the
unit cabinet at a single location, through either the side or bot-
tom, without any field modifications. An integrated control board
shall provide timed control of evaporator fan functioning and
burner ignition. Heating section shall be provided with the fol-
lowing minimum protection:
a. Primary and auxiliary high-temperature limit switches.
b. Induced draft pressure sensor.
c. Flame roll out switch (manual reset).
d. Flame proving controls.
e. All two stage gas units shall have two independent
stages of capacity (70% or 75% 1st stage, 100% 2nd
stage) 3 through 5 ton and (60% 1st stage, 100% 2nd
stage) 6-1/2 through 12-1/2 ton.
ELECTRIC HEATING SECTION (IF EQUIPPED)
An electric heating section, with nickel chromium elements,
shall be provided in a range of 3 thru 54KW. The heating sec-
tion shall have a primary limit control(s) (automatic reset) to pre-
vent the heating element system from operating at an
excessive temperature. The Heating Section assembly shall
slide out of the unit for easy maintenance 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.
• VARIABLE AIR VOLUME (VAV) - The VAV option using
a variable frequency drive (VFD) shall be available on
6-1/2 through 12-1/2 ton models for applications requiring
a constant supply-duct static pressure. Units equipped for
VAV shall be controlled by a duct pressure transducer
with a 0 - 5" WC pressure range. The pressure transducer
shall provide a 0 - 5 VDC output signal to a VAV control
board which, in turn shall provide a 2 - 10 VDC speed
reference signal to the VFD. The VAV control board shall
operate using factory-installed Supply Air, Return Air and
Outside Air Temperature Sensors with a nominal
resistance of 10,000 Ohms. Units equipped with VFD's
shall have factory-installed manual bypass as an option.