Lennox CB26UH Series Installation Instructions Manual page 3

I WARNING
All CB(X)26UH air handlers are designed for indoor
installation only. As shipped, the units are ready for
installation in either upflow or horizontal left-hand air
discharge applications. All units may be installed with
optional field-installed electric heat and a matched remote
outdoor unit.
• CBX26UH air handlers may be installed with a
matched HFC-410A remote outdoor unit. These units
are completely assembled, including a factory
installed check/expansion valve.
• CB26UH air handlers may be installed with a matched
HCFC-22 remote outdoor unit. These units are
completely assembled, including a factory installed
check/expansion valve.
Table 1. Orifice (RFC) Part Number (Sizes - in.)
Model
018
O24
O3O
O36
O42
037, 048
O6O
HCFC-22
NOTE 1
13ACD/ AC13
13HPD / HP13
100484-08 (0.057)
100484-11 (0.061)
100484-21 (0.072)
100484-23 (0.074)
100484-30 (0.082)
HFC-410A
NOTE 2
XC13 / XP13
Refer to orifice table
in outdoor unit instal-
lation manual
100484-44 (0.098)
Note 1 - Orifice ships Note 2 - Orifice ships with
with Air Handler. outdoor units.
CB26UH-R (RFC) units may be installed with a
matched remote outdoor unit. These units are
equipped with an HCFC-22 refrigerant flow control
device (see orifice table 1 ). Also, these units can be
used with HFC-410A refrigerant provided the RFC
shipped with the outdoor unit is installed in place of the
RFC device shipped with the CB26UH-RFC unit.
WARNING
These instructions are intended as a general guide and do
not supersede local or national codes in any way. Consult
authorities having jurisdiction before installation.
Compliance with all local, state, or national codes
pertaining to this type of equipment should be determined
prior to installation. Read this instruction manual, as well
as the instructions supplied in separate equipment, before
starting the installation.
In addition to conforming to manufacturer's installation
instructions and local municipal building codes, installation
of Lennox air handler units (with or without optional electric
heat), MUST conform with National Fire Protection
Association (NFPA) standards: "Standard for Installation
of Air Conditioning and Ventilation Systems" (NFPA No.
90A) and "Standard for Installation of Residence Type
Warm Air Heating and Air Conditioning Systems" (NFPA
No. 90B).
IMPORTANT
All models are designed for indoor installation only. The
installation of the air handler, field wiring, duct system, etc.
must conform to the requirements d the National Electrical
Code, ANSI/NFPA No. 70 (latest edition) in the United
States, and any state laws, and local ordinances (including
plumbing or wastewater codes). Local authorities having
jurisdiction should be consulted before installation is
made. Such applicable regulations or requirements take
precedence over the general instructions in this manual.
Install the conditioned air plenum, ducts and air filters (not
provided) in accordance with NFPA 90B Standard for the
Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
The air handler is shipped from the factory completely
assembled. The unit is provided with flanges for the
connection of the duct system.
Do not remove the cabinet knockouts until it has been
determined which knockouts will need to be removed for
the installation.
Page 3
CB(X)26UH SERIES