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262292-YTG-B-0107
4 Unitary Products Group
FEATURES
All models are available with a wide variety of factory-mounted
options such as stainless steel heat exchangers, phase
monitor, dirty filter switch, and coil guard to make them suitable
for almost every application.
All units are self-contained and assembled on full perimeter
base rails with holes in the four corners for overhead rigging.
Every unit is completely piped, wired, charged and tested at the
factory to simplify the field installation and to provide years of
dependable operation.
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.
All models are available with these “factory mounted” outdoor
air damper options:
• Single enthalpy economizer
• Single enthalpy economizer with power exhaust
• Motorized outdoor air 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.
All supply air blowers are equipped with a belt drive that can be
adjusted to meet the exact requirements of the job. A high static
drive option is available for applications with a higher CFM and/
or static pressure requirement. A variable air volume (VAV)
option using a variable frequency drive is available for
applications requiring a constant supply duct pressure. A
differential pressure transducer is used to monitor supply duct
static pressure and return a speed reference signal to the VFD
to control the output of the indoor blower motor.
All compressors include scroll compressors and internal
pressure relief. Every refrigerant circuit includes an expansion
valve, a liquid line filter-drier, a discharge line high pressure
switch and a suction line with a freezestat and low pressure/
loss of charge switch to protect all system components. A hot
gas bypass option, consisting of an adjustable compressor
discharge bypass valve, is available for low cooling load
applications.
• Simplicity® Controls - Simplicity® 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 can
be reviewed at any time. Alarms and programmed values
are retained through the loss of power.
All units have long lasting powder paint cabinets with 1000 hour
salt spray test approval under ASTM-B117 procedures.
All models are CSA approved.
• Warranty - All models include a one-year limited parts
warranty on the complete unit. Compressors and electric
heater elements carry a five-year warranty. Gas heat
exchangers carry a 10-year parts warranty.
• Gas Heat Operation - 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.