Filter
Top Products
251934-YTG-J-0910
Johnson Controls Unitary Products 7
pressure in the supply duct. A pressure transducer and
VAV control board are mounted inside the control box.
The drive comes completely wired and pre-programmed
from the factory.
An optional, factory-installed manual bypass switch
available with factory-installed VFD can be found in the
Blower Motor Access compartment. The switch can be
used to either route power to the VFD for modulating
control of the blower motor, to bypass the drive and
operate the motor at full speed, or to power the drive (and
not the motor) for diagnostic purposes.
Due to space limitations, VAV is not available with any of
the factory-installed BAS options described below, but is
available with ‘BAS-ready’ models. Terminal blocks are
provided in the control box for field wiring of the customer-
installed BAS.
A ‘VFD-ready’ option provides the provisions for a
customer-installed drive. The unit comes with a mounting
bracket installed in the Blower Access compartment which
may accommodate other vendor’s drives depending on
their size. In order to utilize the unit’s mounting bracket,
the maximum recommended drive dimensions are as
follows:
For 5-hp motor applications........................ 13” H x 6” W x 7” D
For 7.5 thru 15-hp motor applications ........ 13” H x 8” W x 8” D
If the drive will not fit in the allotted space, then it will have
to be mounted elsewhere; either within the building on a
perpendicular wall which is not subjected to excessive
temperature, vibration, humidity, dust, corrosive gas,
explosive gas, etc., or within an appropriate enclosure
rated for outside installation to safeguard against
moisture, dust and excessive heat.
A terminal block located in the control box is provided for
field connection of the VFD controls.
• Hot Gas Bypass - To allow for low cooling load operation,
a direct-acting pressure-modulating bypass control valve
installed on the system #1 discharge line is used to divert
high temperature, high pressure refrigerant around the
TXV in order to maintain a desired minimum evaporator
pressure. HGBP is standard on all units with VAV and
optional with CV units.
• Filter Options - Standard units are shipped with 2" throw-
away filters installed. 2" pleated and 4" pleated filters are
offered as a factory installed option.
• Convenience Outlet - This 110 volt outlet can be
"powered" by the unit with a stepdown transformer or you
may order the unit with a "non-powered" convenience
outlet that can be wired in the field.
• Disconnect Switch - For gas heat units and cooling units
with electric heat, a HACR breaker sized to the unit is
provided. For cooling only units, a switch sized to the
largest electric heat available for the particular unit is
provided. Factory installed option only.
• Double Wall Construction - Optional double wall
construction is available to provide smooth inner surfaces
for easy and effective cleaning to reduce risk of dirt and
bacterial accumulation. Fiberglass insulation is sandwiched
between heavy gauge steel sheets to form a durable, rigid
casing to withstand higher working pressures and impact
forces. The heavy-duty construction provides excellent
acoustic and thermal insulation and eliminates erosion of
insulation material and contamination of the air stream.
• York Commercial Comfort System (YCCS) - Provides
rooftop system integration for YCCS single zone, change-
over bypass and VAV systems.
• Smoke Detectors - (supply air & return air) The smoke
detectors stop operation of the unit by interrupting power
to the control board if smoke is detected within the air
compartment.
• Coil Guard - Customers can purchase a coil guard kit to
protect the condenser coil from damage. This is not a hail
guard kit.
• Stainless Steel Heat Exchanger - For applications in
corrosive environments, this option provides a full
stainless steel heat exchanger assembly.
• Stainless Steel Drain Pan - An optional rustproof
stainless steel drain pan is available to provide years of
trouble-free operation in corrosive environments.
• Phase Monitors - Designed to prevent unit damage. The
phase monitor will shut the unit down in an out-of phase
condition.
• High Static Drive - May include a belt, blower pulley,
motor pulley or a motor change to enhance blower
performance.
• Low Static Drive - May include a belt, blower pulley,
motor pulley or a motor change when standard airflow is
not required. (ZJ/ZR/ZF300 only).
• 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. Factory installed option or
field installed accessory.
• Hinged Filter Door/"Tool Free" Blower And Access
Panels (Not Hinged) - This option allows for easy access
and maintenance.
NOTE: Knobs are shipped separately within the unit to prevent
shipping damage. These must be field installed for tool
free operation.
• Hinged/"Tool Free" Blower, Blower Motor, Filter And
Electric Access Panels - This option allows for complete
hinged and tool free access to the unit’s blower, blower
motor, filters and electrical panel sections.
Factory installed smoke detectors in the return air, may
be subjected to freezing temperatures during “off” times
due to out side air infiltration. these smoke detectors have
an operational limit of 32°F to 131°F. smoke detectors
installed in areas that could be out side those limitations
will have to be moved to prevent having false alarms.