INSTALLATION
E2011 Lennox Industries Inc.
Dallas, Texas, USA
TXV
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
RFC
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a qualified installer or service agency.
CAUTION
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
INSTRUCTIONS
CB(X)26UH(−R) Series Units
AIR HANDLERS
505,059M (65937170)
07/11
Supersedes 05/11
Table of Contents
Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CB(X)26UH Series Units 3. . . . . . . . . . . . . . . . . . . . . . .
Requirements 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Clearances 4. . . . . . . . . . . . . . . . . . . . . . . . .
Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condensate Drain 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System and Filters 8. . . . . . . . . . . . . . . . . . . . . . . .
Connecting Refrigerant Lines 9. . . . . . . . . . . . . . . . . . .
Sealing the Unit 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections 9. . . . . . . . . . . . . . . . . . . . . . . . .
Airflow − Cooling Blower Speed 12. . . . . . . . . . . . . . . . . .
Check−Out Procedures 15. . . . . . . . . . . . . . . . . . . . . . . . .
Operation 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accessories 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cabinet Insulation 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
Package 1 of 1 contains the following:
1 − Assembled air handler unit for upflow or horizontal air
discharge application (includes upflow and horizontal
drain pans)
NOTE For downflow application, order kit 12W61
(0658731−75).
Check equipment for shipping damage. If found,
immediately report damage to the last carrier. Check the
unit rating plate to confirm that delivered unit matches
order.
Litho U.S.A.
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs and HCFCs and HFCs) as of July 1,
1992. Approved methods of recovery, recycling or
reclaiming must be followed. Fines and/or incarceration
may be levied for noncompliance.
IMPORTANT
This unit must be matched with an outdoor unit as specified in Lennox Engineering Handbook.
07/11 505,059M (65937170)
*2P0711* *P505059M*
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass
wool. Breathing this may cause lung cancer. (Fiberglass
wool is known to the State of California to cause cancer.)
Fiberglass wool may also cause respiratory, skin, and
eye irritation.
To reduce exposure to this substance or for further information, consult material safety data sheets available
from address shown below, or contact your supervisor.
Lennox Industries Inc.
P.O. Box 799900
Dallas, TX 75379−9900
Page 1
CB(X)26UH Unit Dimensions − inches (mm)
BC
1 (25)
LINE VOLTAGE RIGHT,
LEFT AND TOP
LOW VOLTAGE
RIGHT SIDE ONLY
AIR FLOW
A
CONDENSATE DRAIN
SUCTION
LINE
F
LIQUID
LINE
PIPING PLATE (4) (2−1/4 X 3−3/4)
FILTER ACCESS
E
D
3/4 (19)
2-1/2 (64)
G
(OPENING) (OPENING)
2-1/2 (64)
1-1/2 (38)
H
1-1/2 (38)
FRONT VIEW SIDE VIEW
OPTIONAL DUCT ADAPTOR KIT (KIT ALLOWS DIRECT
CONNECTION OF THE DUCTWORK TO THE RETURN AIR
OPENING OF THE AIR HANDLER, NOT REQUIRED IF AN
EXTERNAL FILTER IS USED.)
CB(X)26UH Dimensions (for Upflow and LH/RH Horizontal Air Discharge Applications)
−018, −024 −030, −036 −037*, −042, −048* −060
Dimension
A 46−3/4 1187 51 1295 54 1372 60 1524
B 18−1/2 470 21−1/4 540 21-1/4 540 21-1/4 540
C 22 559 22 559 26 660 26 660
D 11 279 12−1/2 318 12 305 11− 3/ 4 298
E 16 406 18−1/2 470 16−3/4 425 17 432
F 5−1/2 140 6 152 4 102 4 102
G 13−1/2 343 16 406 16 406 16 406
H 19 483 19 483 23 584 23 584
Supply Air
Opening
Return Air
Opening
Depth 17 432 17 432 21 533 21 533
Width 16−1/2 419 19−1/4 489 19−1/4 489 19−1/4 489
Depth 18−1/4 464 18−1/4 464 22−1/4 565 22−1/4 565
Width 13−1/2 343 16−1/4 413 16−1/4 413 16−1/4 413
* −037 and −048 units not available in RFC model.
inches mm inches mm inches mm inches mm
505059M 0511
Page 2
CB(X)26UH Series Air Handlers
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.
S 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.
S 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.)
HCFC−22
Model
018 100484−08 (0.057)
024 100484−11 (0.061)
030 100484−21 (0.072)
036 100484−23 (0.074)
042 100484−30 (0.082)
037, 048 not supported
060 100484−44 (0.098)
13HPD / HP13 XC13 / XP13
Note 1 − Orifice ships
with Air Handler.
NOTE 1
HFC−410A
Refer to orifice table in
outdoor unit installation
Note 2 − Orifice ships with
outdoor units.
NOTE 2
manual
S CB26UH−R (RFC) units may be installed with a
matched remote 13HPD/ HP13 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 HCFC−22 (13ACD/AC13), or
HFC−410A refrigerant provided the RFC shipped with
the outdoor unit is installed in place of the RFC device
shipped with the CB26UH−R unit.
Requirements
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
The CB(X)26UH units are designed to match, and must
be used with, outdoor units as rated. The indoor sections
are manufactured with a check/expansion valve (TXV)
or refrigerant flow control (RFC) device to provide optimum refrigerant control and system performance with a
variety of different capacities of outdoor units.
TXV unitsIn some cases, the rating of the outdoor unit
may require that the coil assembly installed TXV be
changed to obtain rated performance.
All models are designed for indoor installation only. The
installation of the air handler, field wiring, duct system, etc.
must conform to the requirements of 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.
Select the final air discharge position which best suits the
site conditions. Consider required clearances, space,
routing requirements for refrigerant line, condensate
disposal, filters, duct system, wiring, and accessibility for
service. Refer to the air handler rating plate on the air
handler for specific information.
WARNING
Excessive Weight Hazard − Use two or more people
when moving and installing the unit. Failure to do so can
result in back or other type of injury.
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
WARNING
Danger of explosion. Keep flammable materials and vapors, such as gasoline, away
from air handler. Place air handler so that
heating elements are at least 18 inches (46
cm) above the floor for a garage installation. Failure to follow these instructions
can result in death, explosion, or fire.
NOTES
During cooling operation, excessive sweating may occur if
the air handler is installed in a very humid space.
If installed in an unconditioned space, sealant should be
applied around the electrical wires, refrigerant tubing, and
condensate lines where they enter the cabinet.
Electrical wires should be sealed on the inside where they
exit the conduit opening. Sealant is required to prevent air
leakage into, and condensate from forming inside of, the
air handler, the control box, and on the electrical controls.
Page 3
CB(X)26UH SERIES
This unit is approved for installation clearance to
combustible material as stated on the unit rating plate.
Accessibility and service clearances must take
precedence over combustible material clearances.
The air handler must be installed so that free access is
allowed to the coil/filter compartment and blower/control
compartment.
Horizontal applications of the air handler must be installed
sloped (approximately 5/8 inch) toward the drain pan
openings to ensure proper condensate drainage.
Installation Clearances
NON−DUCTED RETURN CLOSET INSTALLATION
The air handler can be installed in a closet with a false
bottom to form a return air plenum. It may also be installed
with a return air plenum under the air handler.
Louvers or return air grilles are field-supplied. Local codes
may limit application of systems without a ducted return to
single story buildings.
When a CB(X)26UH unit is installed in a closet with a
louvered return opening, the minimum open area for the
louvers will be:
S 320 square inches for −018 and −024 models;
S 360 square inches for −030 and −036 models;
S 450 square inches for −042 thru −060 models.
If the free area is not known, assume a 25% free area for
wood or a 75% free area for metal louvers or grilles. Using
the louver dimensions and the 25% or 75% assumption,
determine if the open area meets the minimum open area
listed above.
If a return air plenum is used, the return air grille should be
immediately in front of the opening in the plenum to allow
for the free flow of return air. When not installed in front of
the opening, there must be adequate clearance around the
air handler to allow for the free flow of return air.
If a filter is to be installed at the air handler, early models
require a filter rack be formed using factory−supplied
flanges. Lay the unit on its back and pry out the filter rack
tabs as shown in figure 1. Repeat procedure on opposite
side.
Figure 1. Filter Rack Tabs (Pre April 2006)
Later models are equipped with rails in which the filter
slides. Two screws and a bracket must be removed to
insert and remove the filter (see figure 2).
BRACKET
SCREWS
(DUCT ADAPTER AND
SELF TAPPING SCREWS
− OPTIONAL FOR ATTACHING RETURN AIR
DUCT)
Installation
GENERAL INFORMATION
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer or service agency.
CB(X)26UH units are factory−assembled and configured
for installation in upflow or horizontal left−hand air
discharge applications.
Each unit consists of a blower assembly, refrigerant coil,
and controls, in an insulated galvanized steel factory
finished enclosure. Knockouts are provided for electrical
wiring entrance.
For ease in installation, it is best to make any necessary
coil configuration changes before setting air handler in
place.
505059M 0511
FILTER RAILS
Figure 2. Filter Rails (April 2006 and Later)
UPFLOW APPLICATION
1. The air handler must be supported on the bottom only
and set on solid floor or field-supplied support frame.
Securely attach the air handler to the floor or support
frame.
2. If installing a unit in an upflow application, remove the
horizontal drain pan. IMPORTANT − The horizontal
drain pan is not required in upflow air discharge
installations; its removal provides the best
efficiency and air flow.
3. Place the unit in the desired location and level it.
Connect return and supply air plenums as required
using sheet metal screws.
Page 4
4. Install units that have no return air plenum on a stand
that is at least 14" from the floor. This will allow proper
air return.
HORIZONTAL DRAIN PAN
IMPORTANT! REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
HORIZONTAL DRAIN
UPFLOW
DRAIN PAN
UPFLOW DRAIN CON-
NECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
CONNECTIONS
(BOTH SIDES; NOT
USED)
Figure 3. Upflow Configuration
HORIZONTAL APPLICATIONS
IMPORTANT
When removing the coil, there is possible danger of
equipment damage and personal injury. Be careful when
removing the coil assembly from a unit installed in right−
or left−hand applications. The coil may tip into the drain
pan once it is clear of the cabinet. Support the coil when
removing it.
NOTE This unit may be installed in left−hand or
right−hand air discharge horizontal applications. Adequate
support must be provided to ensure cabinet integrity.
Ensure that there is adequate room to remove service and
access panels if installing in the horizontal position.
1. Determine whether left-hand or right-hand air
discharge is required. If right-hand is required, perform
Right−Hand Discharge Modification on page 6.
2. Determine knockouts required for drain line
connections.
3. With access door removed, knock out drain line
opening for installing drain lines.
4. Set unit so that it is sloped toward the drain pan end of
the unit (see figure 10 on page 7).
5. The horizontal configuration is shown in figure 5.
6. If the unit is suspended, the entire length of the cabinet
must be supported. If you use a chain or strap, use a
piece of angle iron or sheet metal attached to the unit
(either above or below) to support the length of the
cabinet. Use securing screws no longer than 1/2 inch
to avoid damaging the coil or filter. See figure 4. Use
sheet metal screws to connect the return and supply
air plenums as required.
AIR FLOW
Drains
ANGLE IRON OR SHEET
METAL
1/2 IN. SCREWS
MAX.
AIR FLOW
FRONT VIEW END VIEW
ELECTRICAL INLET CLEAR-
ANCE 4 IN. (102 MM)
Figure 4. Suspending Horizontal Unit
NOTE When the unit is installed in horizontal
applications, a secondary drain pan is recommended.
Refer to local codes.
NOTE For applications where return air ducting is to be
connected to the bottom of the coil blower, Lennox offers a
duct adapter kit which mounts on the filter door side of the
end of the unit (shown in figure 2). This provides a metal
edge for attaching the return air duct. One duct adapter
and two self−tapping screws are needed for each
installation. Packages of 10 adapters/20 screws are
available: 0658731−85 (Catalog No. X8103) for the
−018/−024 size units; 0658731−86 (Catalog No. X8104) for
the −030 to −060 size units.
KNOCKOUT
LEFT-HAND DRAINS
Figure 5. Left-Hand Discharge Configuration
RIGHT−HAND AIR DISCHARGE MODIFICATION
For horizontal right−hand air discharge, the following field
modifications are required.
1. Remove and set aside blower and coil access covers.
2. Remove the coil support bracket (detail A, figure 7).
3. Remove coil assembly, bottom drain pan and
horizontal drain pan as one assembly from the air
handler.
4. Remove two screws, blow off prevention bracket
(where used; see table 2), and horizontal drip shield.
Rotate the brackets 180º and reinstall using the same
screws.
5. Move the horizontal drain pan to the opposite side of
the coil. Be sure drain holes toward the back of the unit
are plugged (see figure 8). Remove the plugs from the
front drain pan ports.
6. Re−install modified coil/drain pan assembly in air
handler in the same orientation as before.
Page 5
CB(X)26UH SERIES
Loading...