K-Series Packaged Gas / Electric 7.5 to 12.5 Ton / Page 8
ECONOMIZER OPTIONS
Factory or Field Installed
Economizer
(Standard and High Performance
Common Features)
Downflow or Horizontal with
Outdoor Air Hood and Barometric
Relief Dampers with Exhaust
Hood.
Barometric Relief Dampers allow
relief of excess air, aluminum blade
dampers prevent blow back and
outdoor air infiltration during off
cycle, bird screen furnished.
NOTE - Optional Horizontal Low
Profile Barometric Relief Dampers
with Exhaust Hood are available
for field installation in a reduced
space.
Occupied/Unoccupied mode with
field furnished setback thermostat.
Demand Control Ventilation (DCV)
ready using optional CO
2
sensors.
Mixed Air Sensor is furnished for
field installation in the rooftop unit.
Sensor is factory installed when
Economizers are factory installed.
Single sensible sensor is furnished
with Economizer and enables
economizer operation if the
outdoor temperature is less than
the setpoint of the control.
Standard Economizer Features
(Not for Title 24)
Gear-driven action, return air
and outdoor air dampers, plug-
in connections to unit, nylon
bearings, neoprene seals, 24-volt,
fully-modulating spring return
motor.
Standard Economizer
Control Module
The Standard
Economizer
Control Module
can be adjusted
to operate based
on outdoor air
temperatures.
K
L
Economizer Controls:
• Damper Minimum Position
- Can be set lower than
traditional minimum air
requirements resulting in cost
savings.
• IAQ Sensor - Signals
dampers to modulate and
maintain 55°F when CO
2
is
higher than the CO
2
setpoint.
• Demand Control Ventilation
(DCV) LED - A steady green
Demand Control Ventilation
LED indicates the IAQ reading
is higher than setpoint and
requires more fresh air.
•
Free Cool LED - A steady
green LED indicates outdoor
air is suitable for free cooling.
Free Cooling runs when outdoor
air temperature is lower than
the set temperature on the
economizer control.
NOTE: The Free Cooling
default setting for outdoor air
temperature sensor is 55°F.
High Performance
Economizer Features
Approved for California Title 24
building standards.
Low leakage dampers are Air
Movement and Control Association
International (AMCA) Class 1A
Certified - Maximum 3 CFM per sq.
ft. leakage at 1 in. w.g.
ASHRAE 90.1-2010 compliant
Gear-driven action, high torque
24-volt fully-modulating spring
return damper motor, return air
and outdoor air dampers, plug-in
connections to unit, stainless steel
bearings, enhanced neoprene
blade edge seals and flexible
stainless steel jamb seals to
minimize air leakage.
NOTE - High Performance
Economizers are not approved for
use with enthalpy controls in Title
24 applications.
High Performance
Economizer Control Module
Module
provides inputs
and outputs
to control
economizer
based on
parameter settings. Module
automatically detects sensors by
polling to determine which sensors
are installed in system.
Module displays any alarm messages
(fault detection and diagnostics) as
an aid in troubleshooting.
Non-volatile memory retains
parameter settings in case of
power failure.
Keypad with four navigation
buttons and LCD screen is
furnished for setting economizer
parameters.
•
Menu Up/Exit
button
returns to the main menu.
• Arrow Up button moves
to the previous or next
parameter within the selected
menu.
• Arrow Down button moves
to the next parameter within
the selected menu.
• Select (enter) button
confirms parameter selection.
Main Menu Structure:
• STATUS (economizer and
system operation status)
• SETPOINTS (settings for
various setpoint parameters)
• SYSTEM SETUP (settings/
information about the system)
• ADVANCED SETUP (freeze
protection, CO
2
settings,
stage 3 delay and additional
calibration settings)
• CHECKOUT (damper
positions)
• ALARMS (output signal that
can be configured for remote
alarm monitoring)
OPTIONS / ACCESSORIES
