Downflow Economiser - Lennox SCA 010 Installation, Operation & Maintenance Manual

DOWNFLOW ECONOMISER

DOWNFLOW ECONOMISER DOWNFLOW ECONOMISER DOWNFLOW ECONOMISER DOWNFLOW ECONOMISER
The economiser are designed for use with standard
(downflow) SMART units.
The economiser opens a set of dampers to allow 0 to 100
percent outdoor air to be used for cooling when outdoor
humidity and temperature are acceptable.
Additional (2nd stage) cooling demand is directed to the
compressor while the dampers remain open. if outdoor air
becomes unacceptable, the outdoor air dampers close to a
predetermined minimum position while the compressor
cooling circuit cycles as needed.
PARTS ARRANGEMENT
Enthalpy control
Access cover
Remote
mounting
base
Damper
motor
(*) : Mixed air sensor should be removed from economiser
and installed in supply air stream as shown in figure 39
Outdoor air
dampers
Outdoor damper
hood
Enthalpy sensor
Return air dampers
Return duct flange
MIXED AIR
SENSOR
Figure 38
PARTS ARRANGEMENT
NOTE : Mixed air sensor should be
removed from economiser and
installed in supply air stream as
shown in figure 39
Enthalpy control on
(connects to jackplug in
remote mounting base
DOWNFLOW ECONOMISER
Outdoor air dampers
Enthalpy control typical
Control access cover
Damper motor
Return air dampers
MIXED AIR SENSOR INSTALLATION
Mixed air sensor
(*)
SENSOR
BULB
Wiring harness
blower compartment)
Factory installed
return air filter
Control harness
CAP TUBE
Access cover removed
FILTER
IOM / Rooftop Smart and Linéa™ Range - Page 33
Outdoor
air damper
hood
Figure 37
Figure 39
Figure 40