02/06
*2P0206*
Page 1
505,176M
*P505176M*
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
2006 Lennox Industries Inc.
Dallas, Texas, USA
Table of Contents
Shipping & Packing List 1. . . . . . . . . . . . . . . . . . . . . . . . .
Unit Dimensions 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Requirements 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location Selection 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rigging & Setting Unit 4. . . . . . . . . . . . . . . . . . . . . . . . . .
Clearances 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Existing Common Vent Systems 5. . . . . . . . . . . . . . . . . .
Condensate Drain 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply & Return Connections 6. . . . . . . . . . . . . . . . . . . .
Compressors 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start−Up and Operation 10. . . . . . . . . . . . . . . . . . . .
Condenser Fan Clearances 11. . . . . . . . . . . . . . . . . . . . .
Maintenance 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INSTALLATION
INSTRUCTIONS
13CHA SERIES UNITS
PACKAGED ELECTRIC UNIT (2−5 TONS)
505,176M (38152A076)
02/06
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 qualified installer or service agency.
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.
Litho U.S.A.
HORIZONTAL
SUPPLY AIR
OPENING
BACK VIEW
END VIEW
TOP VIEW
A
B
FRONT VIEW
HORIZONTAL
RETURN AIR
OPENING
C
L
FG
H
JK
D
E
E
D
DOWN−FLOW
SUPPLY AIR
OPENING
DOWN−FLOW
RETURN AIR
OPENING
E
D
E
D
END VIEW
CONDENSATE DRAIN
ELECTRICAL INLET
2−1/2 (64)
2−1/2 (64)
2−3/4
(70)
2−3/4
(70)
2−3/4
(70)
2−1/2 (64)
AA
CCDD
FF
BB
EE
Page 2
13CHA Unit Dimensions − inches (mm)
Corner Weights
Center Of
Gravity
Model
Number
AA
BB CC DD EE FF
Number
lbs. lbs. lbs. lbs. in. in.
13CHA−24 73 91 114 92 16 29
13CHA−30 73 91 114 92 16 29
13CHA−36 80 93 117 100 16 30
13CHA−42 102 128 151 120 21 33
13CHA−48 105 129 152 124 21 33.5
13CHA−60 105 129 152 124 21 33.5
A B C D E
Model No.
in.
mm in. mm in. mm in. mm in. mm
13CHA−24
13CHA−30
13CHA−36
34−1/4 870 65−3/8 1661 36−1/2 927 11−1/4 286 17−1/4 438
13CHA−42
13CHA−48
13CHA−60
38−1/4 972 75 1905 46 1168 11−1/4 286 19−1/4 489
F G H J K L
Model No.
in.
mm in. mm in. mm in. mm in. mm in. mm
13CHA−24
13CHA−30
13CHA−36
20 508 8−1/2 216 3 76 20−1/4 514 4−1/2 11 4 19 483
13CHA−42
13CHA−48
13CHA−60
22 559 9−1/4 241 3−1/4 83 22−1/4 572 4 102 16−1/4 413
Page 3
Parts Arrangement
General
These installation instructions are intended as a general
guide only, for use by an experienced, qualified contractor.
The Merit
®
Series 13CHA 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.
Page 4
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.
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".
Figure 1
Accessory Lift Kit
Lifting Bracket
Accessory
Sheet Metal
Screw
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.
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.
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