Options & Accessories - Lennox Energence LGH Manual

OP TION S / A CC ES S O RIES
ECONOMIZER (continued)
Factory or Field Installed
Single Enthalpy Temperature Control
• Outdoor air enthalpy sensor enables Economizer if the
outdoor enthalpy is less than the setpoint of the control
Differential Enthalpy Control
• Order two Single Enthalpy Controls
• One is field installed in the return air section
• One is installed in the outdoor air section
• Allows the economizer control to select between
outdoor air or return air, whichever has lower enthalpy
Field Installed
Outdoor Air CFM Control
• Maintains constant outdoor air volume levels on the
supply air fan and varying unit airflows
• Velocity sensor located in the rooftop unit outdoor
air section, the Prodigy
®
economizer position to help minimize the effect of
supply fan speed changes on outdoor air volume levels
• Setpoint for outdoor air volume is established by field
testing
NOTE - Not available with Demand Control Ventilation
(CO2 Sensor) or Building Pressure Control.
Building Pressure Control
• Maintains constant building pressure level
• Includes a static pressure transducer and outdoor static
pressure assembly
• Using differential pressure information between the
outdoor air and the building air, the Prodigy
controller changes the economizer position to help
maintain a constant building pressure
NOTE - Not available with Demand Control Ventilation
(CO2 Sensor) or Outdoor Air CFM Control.
Energence Packaged Gas / Electric 45.7 to 88 kW - 50 Hz / Page 10
®
unit controller changes the
unit
®
EXHAUST
Factory or Field Installed
Downflow Barometric Relief Dampers
• Allow relief of excess air
• Aluminum blade dampers prevent blow back and
outdoor air infiltration during off cycle
• Exhaust hood is factory installed when dampers are
factory installed with economizer
• Exhaust hood is furnished with dampers when ordered
for field installation
• Bird screen furnished
N N
Power Exhaust Fans
• Install internal to unit for downflow applications only
with economizer option
• Provides exhaust air pressure relief
• Interlocked to run when supply air blower is operating
• Fans run when outdoor air dampers are 50% open
(adjustable)
• Motor is overload protected
NOTE - Requires Economizer with Outdoor Air Hood and
Downflow Barometric Relief Dampers. Dual fans
are 508 mm diameter with 5 blades with (2) 0.25
kW motors.
Field Installed
Horizontal Barometric Relief Dampers
• For use when unit is configured for horizontal
applications requiring an economizer
• Allows relief of excess air
• Aluminum blade dampers prevent blow back and
outdoor air infiltration during off cycle
• Field installed in return air duct
• Bird screen and hood furnished