Page 42
C-Supply and Return Diffusers
Optional flush mount diffusers/returns FD9 or FD11 and ex-
tended mount diffusers/returns RTD9 or RTD11 are available
for use with the LGA / LCA units. Refer to manufacturer’s in-
structions included with transition for detailed installa-
tion procedures.
D-LAOADM03/07 and LAOD03/07
Outdoor Air Dampers
LAOADM 03/07 and LAOAD03/07 consists of dampers
which may be manually or motor (M) operated to allow up to
25 percent outside air into the system at all times (see figure
32). Washable filters supplied with the outdoor air damp-
ers can be cleaned with water and a mild detergent. It
should be sprayed with Filter Handicoater when dry prior to
reinstallation. Filter Handicoater is R.P. Products coating no.
418 and is available as Lennox Part No. P-8-5069.
E-LAREMD03/07 Economizer
(Field or Factory Installed)
The optional LAREMD03/07 economizer can be used
with LGA / LCA units in downflow and horizontal air discharge
applications. The LAREMD03/07 economizer uses outdoor air
for free cooling when temperature and/or humidity is suitable.
An economizer hood is required and must be ordered sepa-
rately.
NOTE - Gravity exhaust dampers are optional with econo-
mizers.
The economizer is controlled by the economizer control
module A56 which connects to the main control module
A55. Both boards are part of the Integrated Modular Control
(IMC) which controls “L” series unit operation.
The economizer will operate in one of four modes. Each
mode requires a different EM1 economizer DIP switch set-
ting. Each mode also requires different sensors.
LAOADM MOTORIZED OUTDOOR AIR DAMPER
LAOAD MANUAL OUTDOOR AIR DAMPER
FIGURE 32
FILTER BRACKET SIDE VIEW
HOOD TOP
FILTER
16x25x1 (1)
HOOD TOP SEAL
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