Lennox GCS16-1853-235

FIGURE 48
OAD16 AIR DAMPER
Page 48
X-ACCESSORIES
This section describes the application of most of the op
tional accessories which can be connected to the . Some
of the accessories (for example, the Warm Up Control Kit)
are described in the commercial controls section of this
manual.
A-RMF16 Mounting Frame
When installing a unit on a combustible surface for down
flow discharge applications, the Lennox RMF16 roof
mounting (figure 46) frame is used. Otherwise, the RMF16
is recommended but not required. The , if not mounted on
a flat (roof) surface, MUST be supported under all edges
and under the middle of the unit to prevent sagging. The
MUST be mounted level within 1/16" per linear foot in any
direction.
FIGURE 46
TYPICAL MOUNTING FRAME
RMF16-185 SHOWN
DETAIL A
DETAIL B
SUPPLY
OPENING
RETURN
OPENING
FIGURE 47
UNIT BASE
FIBERGLASS
INSULATION
RIGID
INSULATION (FIELD
FURNISHED)
MOUNTING FRAME
(Extends around
entire perimeter of unit)
NAILER STRIP
COUNTER-FLASHING
(FIELD FURNISHED)
ROOF MATERIAL
CANT STRIP
(FIELD FURNISHED)
BASE RAIL
(1-1/2" X 3")
TYPICAL ROOF CURB FLASHING
The assembled RMF16 mounting frame is shown in figure
46. Refer to the RMF16 installation instructions for details
of proper assembly and mounting. The roof mounting
frame MUST be squared to the roof before mounting. Ple
num system MUST be installed before the unit is set on the
mounting frame. Typical roof curbing and flashing is
shown in figure 47. Refer to the RMF16 installation instruc
tions for proper plenum construction and attachment.
B-OAD16 Outdoor Air Damper
OAD16 is a manual outdoor air damper section (figure 48)
which installs in GCS16 to allow a fixed amount of outside
air into the system. OAD16 consists of a set of manually
operated dampers which may be adjusted and locked in
place to allow up to 25 percent outside air into the system
at all times. Automatic operation is available with addition
of an electric springreturn threeposition damper actua
tor. Refer to OAD16
installation instructions
for specific installation
procedure. Washable
filter supplied with the
OAD16 can be
cleaned with water and
a mild detergent. It
should be sprayed with
Filter Handicoater
when dry prior to rein
stallation. Filter Handicoater is R.P. Products coating no.
418 and is available as Lennox Part No. P-8-5069.
C-Economizer
Optional economizer dampers can be applied directly to .
An economizer consists of a mechanically linked recircu
lated air and outdoor air damper assembly, an enthalpy
sensor and damper motor installed in the economizer. An
enthalpy control assembly is also furnished and may be
installed in the filter access area of the unit or in the econo
mizer (depending on model). An exhaust damper assembly
installed in the economizer provides return air exhaust.
Several accessories are available and may be used with
any economizer. Optional Warm Up Kit may be added to
any economizer if electromechanical or simple electronic
control thermostat is used with night setback. Warm Up Kit
forces outdoor air dampers closed during initial morning
warm up. Optional GED16 gravity exhaust dampers may
be installed on any economizer to provide automatic pres
sure relief in return air duct. Optional PED16 power exhaust
damper may be added to larger size economizers in place
of gravity exhaust dampers to provide forced air exchange
during economizer operation. The PED16 installs between
the economizer and the gravity exhaust damper assembly.