Lennox 15CHAX User Manual
INSTALLATION
2006 Lennox Industries Inc.
Dallas, Texas, USA
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
INSTRUCTIONS
15CHAX SERIES UNITS
PACKAGED ELECTRIC UNIT (2−5 TONS)
505,201M (38152A082)
01/08
Supersedes 05/06
Shipping & Packing List
1 − Assembled packaged electric unit
As soon as the unit is received, it should be inspected for
possible damage during transit. If you find any damage, immediately contact the last carrier.
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 licensed professional installer (or
equivalent) or service agency.
Litho U.S.A.
Table of Contents
Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location Selection 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging & Setting Unit 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Clearances 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Existing Common Vent Systems 5. . . . . . . . . . . . . . . . .
Condensate Drain 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply & Return Connections 6. . . . . . . . . . . . . . . . . . . .
Compressors 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Control Board 9. . . . . . . . . . . . . . . . . . . . . . . . . . .
System Operation Monitor 11. . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up and Operation 13. . . . . . . . . . . . . . . . . . . .
Condenser Fan Clearances 14. . . . . . . . . . . . . . . . . . . . .
Maintenance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNING
If this unit is to be installed in a mobile or manufactured home application, the duct system must be
sized to achieve static pressures within the
manufacturer’s guidelines. All other installation
guidelines must also be followed. Failure to do so
may result in equipment damage, personal injury
and improper unit performance.
CAUTION
Danger of sharp metallic edges. Can cause injury.
Take care when servicing unit to avoid accidental
contact with sharp edges.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
01/08
*2P0108*
Page 1
505,201M
*P505201M*
15CHAX Unit Dimensions − inches (mm)
Model
Number
FG
B
E
D
2−1/2 (64)
DOWN−FLOW
SUPPLY AIR
OPENING
FF
AA
2−3/4
(70)
2−1/2 (64)
D
E
DOWNFLOW
RETURN AIR
OPENING
EE
TOP VIEW
BB
CCDD
Corner Weights
AA
Number
lbs. lbs. lbs. lbs. in. in.
15CHAX−24 75 94 117 94 16 29
C
15CHAX−30 75 94 117 94 16 29
15CHAX−36 83 97 121 104 16 30
15XHAX−42 110 138 163 129 21 33
15CHAX−48 114 139 164 134 21 33.5
15CHAX−60 119 145 171 140 21 33.5
BB CC DD EE FF
Center Of
Gravity
Model No.
15CHAX−24
15CHAX−30
15CHAX−36
15CHAX−42
15CHAX−48
15CHAX−60
2−1/2 (64)
END VIEW
D
2 (51)
D
2−3/4
JK
E
E
(70)
HORIZONTAL
RETURN
OPENINGS
H
AIR
(2)
FRONT VIEW
HORIZONTAL
SUPPLY AIR
A
OPENING
E
D
2−3/4
(70)
BACK VIEW
ELECTRICAL INLET
L
CONDENSATE DRAIN
END VIEW
A B C D E F
in.
34−1/4 870 65−3/8 1661 36−1/2 927 11−1/4 286 17−1/4 438 20 508
38−1/4 972 75 1905 46 1168 11−1/4 286 19−1/4 489 22 559
mm in. mm in. mm in. mm in. mm in. mm
15CHAX−24
15CHAX−30
15CHAX−36
15CHAX−42
15CHAX−48
15CHAX−60
Model No.
F G H J K L
in.
mm in. mm in. mm in. mm in. mm in. mm
20 508 8−1/2 216 3 76 20−1/4 514 4−1/2 114 19 483
22 559 9−1/4 241 3−1/4 83 22−1/4 572 4 102 16−1/4 413
Page 2
Parts Arrangement
General
These installation instructions are intended as a general
guide only, for use by an experienced, licensed contractor
(or equivalent).
The 15CHAX units are single−package electric units
designed for outdoor installation on a rooftop or a slab. The
units are equipped with a transformer and blower control
for applications which do not include electric heat. Electric
heat sections are available for separate order.
The unit must be sized based on heat loss and heat gain
calculations made according to the methods of the Air
Conditioning Contractors of America (ACCA).
The units are shipped assembled. All piping, refrigerant
charge, and electrical wiring are factory−installed and
tested. The units require electric power, condensate drain
and duct connections at the point of installation.
Use of this unit as a construction heater or air conditioner is
not recommended during any phase of construction. Very
low return air temperatures, harmful vapors and operation
of the unit with clogged or misplaced filters will damage the
unit.
If this unit has been used for heating or cooling of buildings
or structures under construction, the following conditions
must be met or the warranty will be void:
A room thermostat must control the unit. The use of
fixed jumpers that will provide continuous heating or
cooling is not allowed.
A pre−filter must be installed at the entry to the return air
duct.
The return air duct must be provided and sealed to the
unit.
Return air temperature range between 55°F (13°C)
and 80°F (27°C) must be maintained.
Air filters must be replaced and pre−filter must be re-
moved upon construction completion.
The unit components, duct system, air filters and evap-
orator coil must be thoroughly cleaned following final
construction clean−up.
The unit operating conditions (including airflow, cool-
ing operation, and heating operation) must be verified
according to these installation instructions.
Requirements
These units must be installed in accordance with all
applicable national and local safety codes.
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or customer’s
expense.
These units are design listed by UL in both the United
States and Canada as follows:
For use as a cooling unit.
For outdoor installation only.
Page 3
For installation on combustible material.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you
to fiberglass wool dust. 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
Location Selection
Use the following guidelines to select a suitable location for
these units.
1 − Unit is designed for outdoor installation only. Unit must
be installed so all electrical components are protected
from water.
2 − Condenser coils must have an unlimited supply of air.
3 − For ground level installation, use a level pre−fabricated
pad or use a level concrete slab with a minimum thick-
ness of 4 inches. The length and width should be at
least 6 inches greater than the unit base. Do not tie the
slab to the building foundation.
4 − Maintain level within a tolerance of 1/4 inch maximum
across the entire length or width of the unit.
Rigging & Setting Unit
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. An
optional lifting lug kit (92M51) may be purchased
separately for use in rigging the unit for lifting. Spreaders
MUST be used across the top of the unit. Recommended
spreader length: 2, 2−1/2, 3−ton units −− 44"; 3−1/2, 4, 5−ton
units −− 54".
CAUTION
Before lifting a unit, make sure that the weight is distributed equally on the cables so that it will lift evenly.
Units may also be moved or lifted with a forklift while still in
the factory supplied packaging.
NOTE − Length of forks must be a minimum of 42 inches.
Accessory Lift Kit
Lifting Bracket
Accessory
Sheet Metal
Screw
Figure 1
Clearances
All units require certain clearances for proper operation
and service. Refer to figure 2 for the clearances required
for combustible construction, servicing, and proper unit
operation.
Service Clearances
REAR
30
(762)
FRONT
*Rear clearance is 18" (457) when required for
accessory maintenance.
NOTE − Top Clearance − 36 in. (914 mm)
NOTE − Entire perimeter of unit base requires
support when elevated above mounting surface.
Figure 2
NOTE − Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet.
In the U.S. units may be installed on combustible floors
made from wood or class A, B, or C roof covering material.
In Canada, units may be installed on combustible floors.
3 (156)*
48 (1219)
24
(610)
Page 4
Existing Common Vent Systems
The 15CHAX packaged cooling units with auxiliary electric
heat may replace an existing furnace which is being removed from a venting system commonly run with separate
gas appliances. In this case, the existing vent system is
likely to be too large to properly vent the remaining attached appliances.
Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must
correct the system as indicated in the general venting requirements section.
1 − Seal any unused openings in the common venting sys-
tem.
2 − Inspect the venting system for proper size and horizon-
tal pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which
could cause an unsafe condition.
3 − Close all building doors and windows and all doors be-
tween the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes dryers and any appliances not connected to the common
venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.
4 − Follow the lighting instructions. Turn on the appliance
that is being inspected. Adjust the thermostat so that
the appliance operates continuously.
5 − After the main burner has operated for 5 minutes, test
for leaks of flue gases at the draft hood relief opening.
Use the flame of a match or candle, or smoke from a
cigarette, cigar, or pipe.
6 − After determining that each appliance connected to the
common venting system is venting properly, (step 3)
return all doors, windows, exhaust fans, fireplace
dampers, and any other gas−burning appliances to
their previous mode of operation.
7 − If a venting problem is found during any of the preced-
ing tests, the common venting system must be modified to correct the problem.
Resize the common venting system to the minimum
vent pipe size determined by using the appropriate
tables in Appendix G. (These are in the current standards of the National Fuel Gas Code
ANSI-Z223.1/NFPA 54 in the USA, and the appropri-
ate Category 1 Natural Gas and Propane appliances
venting sizing tables in the current standards of the
CSA B149 Natural Gas and Propane Installation
Codes in Canada.)
Condensate Drain
The 15CHAX unit is equipped with a 3/4 inch FPT coupling
for condensate line connection. Plumbing must conform to
local codes. Use a sealing compound on male pipe
threads.
The drain line must be properly trapped and routed to a
suitable drain. See figure 3 for proper drain arrangement.
The drain line must pitch to an open drain or pump a
minimum of 1 inch per 10 feet to prevent clogging of the
line. Seal around drain connection with suitable material to
prevent air leakage into return air system.
NOTE − Drain line connection may not carry the weight of
the unsupported drain line. Support the drain line, if
necessary.
Drain piping should not be smaller than drain connection at
coil. An open vent in drain line will some times be required
due to line length, friction and static pressure. Drains
should be constructed in a manner to facilitate future cleaning.
NOTE − The condensate drain line MUST be trapped to
provide proper drainage.
CAUTION
Condensate line connection must be hand−tightened. Do not use tools.
Typical Condensate Drain
Unit
Positive Liquid Seal Required
Drain Connection
12.00”
Max.
Figure 3
1.00” Min.
3.00” Min.
Page 5
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