Technical Guide

251933-YTG-V-0913
Johnson Controls Unitary Products 5
Features and Benefits
Standard Features
• High Efficiency - High efficiency 3 thru 5 Ton units reach
13.0 SEER, 6 Ton Cooling only or Cooling with Electric
Heat reach 11.2 EER and 6 Ton Cooling with Gas Heat
reach 11.0 EER. Gas/electric units have electronic spark
ignition and power vented combustion with steady state
efficiencies of 80%. High efficiency heat pumps reach 13
SEER and 7.7 H.S.P. F. These efficiencies exceed all
legislated minimum levels and provide low operating
costs.
• Coil Technology – All ZF condensers utilize Micro-
Channel “all-aluminum” condensers which provide
improved heat transfer capabilities and reduced charge
volumes. All evaporators utilize a conventional copper
tube/aluminum fin design for proven reliability and
performance.
• Convertible Airflow Design - All models (including those
with an economizer) are suitable for either bottom or
horizontal duct connections. For bottom duct, remove the
sheet metal panels from the supply and return air openings
through the base of the unit. For horizontal duct, remove
the supply and return air panels on the rear of the unit.
• System Protection - Suction line freezestats are supplied
on all units to protect against loss of charge and coil
frosting when the economizer operates at low outdoor air
temperatures while the compressors are running. Every
unit has solid-core liquid line filter-driers and high and low-
pressure switches. Internal compressor protection is
standard on all compressors.
• Advanced Controls - The Simplicity
®
Lite™ control
boards have standardized a number of features
previously available only as options or by utilizing
additional controls.
• Low Ambient - An integrated low-ambient control
allows all units to operate in the cooling mode down to
0F outdoor ambient without additional assistance.
Optionally, the control board can be programmed to
lockout the compressors when the outdoor air
temperature is low or when free cooling is available.
• Anti-Short Cycle Protection - To aid compressor life,
an anti-short cycle delay is incorporated into the
standard controls. Compressor reliability is further
ensured by programmable minimum run times. For
testing, the anti-short cycle delay can be temporarily
overridden with the push of a button.
• Fan Delays - Fan on and fan off delays are fully
programmable. Furthermore, the heating and cooling
fan delay times are independent of one another. All units
are programmed with default values based upon their
configuration of cooling and heat.
• Safety Monitoring - The control board monitors the
high and low-pressure switches, the freezestats, the gas
valve, if applicable, and the temperature limit switch on
gas and electric heat units. The unit control board will
alarm on ignition failures, compressor lockouts and
repeated limit switch trips.
• Nuisance Trip Protection and Strikes - To prevent
nuisance trouble calls, the control board uses a “three
times, you’re out” philosophy. The high and low-
pressure switches and the freezestats must trip three
times within two hours before the unit control board will
lock out the associated compressor.
• On Board Diagnostics - Each alarm will energize a
trouble light on the thermostat, if so equipped, and flash
an alarm code on the control board LED. Each high and
low-pressure switch alarm as well as each freezestat
alarm has its own flash code. The control board saves the
five most recent alarms in memory, and these alarms can
be reviewed at any time. Alarms and programmed values
are retained through the loss of power.
• Reliable - From the beginning - All units undergo
computer automated testing before they leave the factory.
Units are tested for refrigerant charge and pressure, unit
amperage, and 100% functionality. For the long term - All
ZF/ZR/XP Series units are painted with a long lasting,
powder paint that stands up over the life of the unit. The
paint used has been proven by a 1000 hour salt spray
test.
• Flexible Placement - All models and configurations share
the same cabinet/footprint and thus the same roof curb.
You have the flexibility to set one curb and choose the
correct tonnage size and heating option after the internal
loads have been determined.
• Full Perimeter Base Rails - The permanently attached
base rails provide a solid foundation for the entire unit and
protect the unit during shipment. The rails offer forklift
access from 3 sides, and rigging holes are available so that
an overhead crane can be used to place the units on a roof.
• Easy Installation - Gas and electric utility knockouts are
supplied in the unit underside as well as the side of the
unit. A clearly identified location is provided to mount a
field supplied electrical disconnect switch. Utility
connections can be made quickly and with a minimum
amount of field labor.
• Wide Range of Indoor Airflows - Indoor fan motors are
either direct-drive or belt-drive type providing maximum
flexibility to handle most airflow requirements.
The Simplicity ® control board used in this product
will effectively operate the cooling system down to
0°F when this product is applied in a comfort cool-
ing application for people. An economizer is typi-
cally included in this type of application. When
applying this product for process cooling applica-
tions (computer rooms, switchgear, etc.), please
reference applications bulletin AE-011-07 or call
the applications department for Unitary Products
@ 1-877-UPG-SERV for guidance. Additional
accessories may be needed for stable operation at
temperatures below 30° F.