Lennox CHA16 User Manual

FIGURE 36
OAD16 AIR DAMPER
Page 40
X-ACCESSORIES
This section describes the application of most of the op
tional accessories which can be connected to the
CHA16.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 CHA16 unit on a combustible surface for
downflow discharge applications, the Lennox RMF16 roof
mounting (figure 34) frame is used.Otherwise, the RMF16
is recommended but not required.The CHA16, if not
mounted on a flat (roof) surface, MUST be supported un
der all edges and under the middle of the unit to prevent
sagging.The CHA16 MUST be mounted level within 1/16"
per linear foot in any direction.
FIGURE 34
TYPICAL MOUNTING FRAME
RMF16-185 SHOWN
DETAIL A
DETAIL B
SUPPLY
OPENING
RETURN
OPENING
FIGURE 35
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)
BASERAIL
(1-1/2"X 3")
TYPICAL ROOF CURB FLASHING
The assembled RMF16 mounting frame is shown in figure
34.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 35.Refer to the RMF16 installation instructions for
proper plenum construction and attachment.
B-OAD16 Outdoor Air Damper
OAD16 is a manual outdoor air damper section (figure 36)
which installs in CHA16 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
CHA16.An economizer consists of a mechanically linked
recirculated air and outdoor air damper assembly, an en
thalpy sensor and damper motor installed in the economiz
er. An enthalpy control assembly is also furnished and may
be installed in the filter access area of the unit or in the econ
omizer (depending on model). An exhaust damper assem
bly 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.

Lennox CHA16 Specifications

General

Brand	Lennox
Model	CHA16
Category	Air Conditioner
Language	English