251934-YTG-G-0708
Johnson Controls Unitary Products
5
Features and Benefits
Standard Features
•
High Efficiency
- High efficiency units reach as high as
12.4 EER. Gas/electric units have electronic spark ignition
and power vented combustion with steady state efficiencies
of 80%. These efficiencies exceed all legislated minimum
levels and provide low operating costs.
•
Balanced Heating
-
•
Gas Heat
- All gas heat units are built with two heating
sections for two equal stages of capacity control. Each
section includes a durable heat exchanger with
aluminized steel or optional stainless steel tubes, a
redundant gas valve, spark ignition, power venting, an
ignition module for 100% shut-off and all of the safety
controls required to meet the latest ANSI standards.
The gas supply piping can be routed into the heating
compartment through a hole in the base pan of the unit
or through a knockout in the piping panel on the front of
the unit.
•
Electric Heat
- All electric heat models (factory installed
only) are wired for a single power source and include a
bank of nickel chromium elements mounted at the
discharge of the supply air blower to provide a high velocity
and uniform distribution of air across the heating elements.
Every element is fully protected against excessive current
and temperature by fuses and two thermal limit switches.
The power supply wiring can be routed into the control
box through a threaded pipe connection in the base pan
of the unit or through a knockout in the wiring panel on
the front of the unit.
•
BAS Controls
- York’s Sunline™ series units offer factory
mounted BAS controls such as
Simplicity
®
Intelli
-
Comfort
™
, Novar, Honeywell, Johnson, York Commercial
Comfort System (YCCS) and CPC.
•
Convertible Airflow Design
- All models (including those
with an economizer) are suitable for either bottom or
horizontal duct connections.
Models with factory
installed power exhaust are suitable for bottom duct
connections
only. For bottom duct, you remove the sheet
metal panels from the supply and return air openings
through the base of the unit. For horizontal duct, you
replace the supply and return air panels on the rear of the
unit with a side duct flange accessory.
•
Factory Mounted Outdoor Air Dampers
- All models are
available with these "factory mounted" outdoor air damper
options:
• Single enthalpy economizer with or without power
exhaust
• BAS-ready economizer with or without power exhaust
• Motorized outdoor air damper
• Barometric Relief Damper
A fixed outdoor air intake assembly will be shipped in the
return air compartment of all units ordered without an
economizer or motorized outdoor air damper option. The
assembly includes a rain hood with a damper that can be set
for 10, 15 or 25% outdoor air. With bottom duct connections,
the intake damper assembly should be mounted over the
opening in the return air panel. With horizontal ductwork, it
should be mounted on the return air duct.
•
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. Crankcase heaters are
standard on reciprocating compressors. Scroll compressors
do not require crankcase heaters. Phase Monitors are
standard on units with scroll compressors. This accessory
monitors the incoming power to the unit and protects the
unit from phase loss and reversed phase rotation.
•
Advanced Controls
-
Simplicity
™ ZJ/ZR/ZF 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.
•
Lead-Lag
- An integrated Lead-Lag option allows equal
run time hours on all compressors, thereby extending
the life of all compressors. This option is selectable on
the unit control board.
•
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
