Lennox 2SCU13 User Manual
INSTALLATION AND MAINTENANCE
INSTRUCTIONS
2SCU13 Series
Split System Air Conditioner
WARNING
The equipment covered in this manual is to be installed by trained and experienced
service and installation technicians. Improper installation, modification, service, or
use can cause electrical shock, fire, explosion, or other conditions which may cause
personal injury, death, or property damage. Use appropriate safety gear including
safety glasses and gloves when installing this equipment.
WARNING
Risk of electrical shock. Disconnect all
remote power supplies before installing or
servicing any portion of the system. Failure
to disconnect power supplies can result in
property damage, personal injury, or death.
WARNING
Installation and servicing of air conditioning
equipment can be hazardous due to internal
refrigerant pressure and live electrical components. Only trained and qualified service
personnel should install or service this equipment. Installation and service performed by
unqualified persons can result in property
damage, personal injury, or death.
WARNING
TABLE OF CONTENTS
INSTALLATION ...................................... 2
START-UP ............................................ 10
OPERATION ........................................ 14
MAINTENANCE ................................... 14
CONNECTION DIAGRAMS ................. 16
WARRANTY......................................... 18
Manufactured By
A.A.C.
A Lennox International Inc. Company
421 Monroe Street
Bellevue, OH 44811
Sharp metal edges can cause injury. When
installing the unit, use care to avoid sharp
edges.
Save these instructions for future reference
# 48283B006 Page 1
*48283B006*
INSTALLATION
Location of Unit
General
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, before
starting the installation. Observe and follow all warnings, cautions, instructional labels, and tags. Failure
to comply with these instructions could result in an
unsafe condition and/or premature component failure.
These instructions are intended as a general guide only
for use by qualified personnel and do not supersede any
national or local codes in any way. The installation must
comply with all provincial, state, and local codes as well as
the National Electrical Code (U.S.) or Canadian Electrical
Code (Canada). Compliance should be determined prior
to installation.
When servicing or repairing HVAC components, ensure
the fasteners are appropriately tightened. Table 1 shows
torque values for fasteners.
Torque Table
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Outdoor units operate under a wide range of weather
conditions; therefore, multiple factors must be considered
when positioning the unit. The unit must be positioned to
give adequate clearances for sufficient airflow and servicing. Refer to Figure 1 for installation clearances.
Installation Clearances
36"
36 *"
36 *"
* A service clearance of 30" must be maintained on
one of the sides adjacent to the control box.
Clearance to one of the other three sides must be
36". Clearance to one of the remaining two sides
may be 12" and the final side may be 6".
A clearance of 24" must be maintained between units.
48" clearance required on top of unit. Maximum soffit
overhang is 36".
36"
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Table 1
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. Any
concealed damage discovered should be reported to the
last carrier immediately, preferably in writing, and should
include a request for inspection by the carrier’s agent.
If any damages are discovered and reported to the carrier
DO NOT INSTALL THE UNIT, as claim may be denied.
Check the unit rating plate to confirm specifications
are as ordered.
Figure 1
Slab Mounting
When installing unit at grade level, install on slab high
enough above grade to allow adequate drainage of water
(see Figure 2). Top of slab should be located so runoff
water from higher ground will not collect around unit.
Refer to roof mounting section for barrier construction if
unit must face prevailing winter winds.
Roof Mounting
Install unit at a minimum of 4" above surface of the roof.
Care must be taken to ensure weight of unit is properly
distributed over roof joists and rafters. Either redwood or
steel supports are recommended.
If unit coil cannot be mounted away from prevailing winter
winds, a wind barrier should be constructed (see Figure 3).
Size barrier at least the same height and width as the
outdoor unit. Mount barrier 24" from the sides of the unit in
the direction of the prevailing winds.
Page 2 # 48283B006
Building
Power
Indoor Unit
Thermostat
Outdoor
Unit
Y1 Outdoor Unit
Heat
Cooling
Indoor Blower
R
W1
Y
G
C
R
W
Y
G
C
C Outdoor Unit
Structure
Slab Mounting
Discharge Air
Mounting Slab
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage field
wiring should be trimmed or secured away from the
low voltage field wiring.
2. Ground unit at unit disconnect switch or to an earth
ground. To facilitate conduit, a hole is in the bottom of
the control box. Connect conduit to the control box using
a proper conduit fitting. Units are approved for use only
with copper conductors. 24V Class II circuit connections
are made to the low voltage pigtails. A complete unit
wiring diagram is located inside the unit control box
cover (see also pages 16 and 17 of this instruction).
Ground Level
2° or 2" per 5' slope tolerance away from building
structure.
Figure 2
Wind Barrier Construction
Prevailing Winter Winds
Wind Barrier
Inlet Air
Inlet Air
24"
Inlet Air
3. Install room thermostat on an inside wall that is not
subject to drafts, direct sunshine, or other heat sources.
4. Install low voltage wiring from outdoor to indoor unit and
from thermostat to indoor unit (see Figure 4).
5. Do not bundle any excess 24V control wire inside control
box. Run control wire through installed wire tie and tighten
wire tie to provide low voltage strain relief and to maintain
separation of field-installed low and high voltage circuits.
Thermostat Designations
Figure 3
Electrical Wiring
All field wiring must be done in accordance with the
National Electrical Code (NEC) recommendations,
Canadian Electrical Code (CEC) and CSA Standards, or
local codes, where applicable.
See unit wiring diagram for power supply connections.
If the indoor unit is not equipped with a blower relay,
one must be field supplied and installed.
Do not connect C (common) connection between
indoor unit and thermostat except when required by
the indoor thermostat. Refer to thermostat installation
instructions. C (common) connection between indoor
unit and outdoor unit required for proper operation.
WARNING
Unit must be grounded in accordance with
national and local codes. Failure to ground unit
properly can result in personal injury or death.
Refer to the furnace or blower coil Installation Instructions
for additional wiring application diagrams and refer to unit
rating plate for minimum circuit ampacity and maximum
overcurrent protection size.
# 48283B006 Page 3
Refrigerant Piping
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections) to the indoor
coil (flare or sweat connections).
Select line set diameters from Table 2 on page 4 to
ensure that oil returns to the compressor. Size vertical
Figure 4
suction riser to maintain minimum velocity at minimum
capacity. Recommended line length is 50' or less. If more
than 50' line set is required, contact Technical Services at
(419) 483-4840.
Table 2 shows the diameters for line sets up to 100'
although vertical lift applications and trapping requirements need to be reviewed with Technical Services for
line sets over 50'.
Refrigerant Line Set Diameters (in.)
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000,818/38/38/38/38/3
000,42 8/3 8/3 8/3 8/3 8/3
000,038/38/38/38/32/1
000,63 8/3 8/3 8/3 8/3 2/1
energy or vibration can be expected. Close attention to
line set isolation must be observed.
Following are some points to consider when placing and
installing a high-efficiency outdoor unit:
Placement
Be aware that some localities are adopting sound ordinances
based on how noisy the unit is at the neighbor’s home, not at
the original installation. Install the unit as far as possible from
the property line. When possible, do not install the unit
directly outside a bedroom window. Glass has a very high
level of sound transmission. Figure 5 shows how to place the
outdoor unit and line set to reduce line set vibration.
Outside Unit Placement
and Installation
Install unit away
from windows
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000,814/34/34/34/34/3
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000,034/34/34/38/78/7
000,63 8/7 8/7 8/7 8/7 8/1-1
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000,84 8/7 8/7 8/7 8/1-1 8/1-1
000,068/1-18/1-18/1-18/1-18/1-1
For installations exceeding 50', contact
Technical Services at (419) 483-4840.
Two 90° elbows installed in lineset
will reduce lineset vibration
Figure 5
Line Set Isolation
Illustrations on the following pages demonstrate procedures which ensure proper refrigerant line set isolation.
Figure 6 shows how to install line sets on horizontal runs.
Figure 7 shows how to make a transition from horizontal
to vertical. Figure 8 on page 6 shows how to install line
sets on vertical runs.
Brazing Connection Procedure
Table 2
Installing Refrigerant Line
During the installation of an air conditioning system, it is
important to properly isolate the refrigerant line to prevent
unnecessary vibration. Line set contact with the structure
(wall, ceiling, or floor) may cause objectionable noise
when vibration is translated into sound. As a result, more
Page 4 # 48283B006
1. Cut ends of refrigerant lines square (free from nicks
or dents). Debur the ends. The pipe must remain
round; do not pinch end of line.
2. Before making line set connections, use dry nitrogen to
purge the refrigerant piping. This will help to prevent
oxidation and the introduction of moisture into the system.
To hang line set from joist or rafter,
use either metal strapping material
or anchored heavy nylon wire ties.
Strapping Material
(around vapor line only)
8’
8’
Tape or Wire Tie
Strap the vapor line to the joist or rafter
at 8 intervals then strap the liquid line
to the vapor line.
’
Floor Joist or
Roof Rafter
Metal Sleeve
Floor Joist or Roof Rafter
Tape or Wire Tie
Wire Tie
(around vapor line only)
Refrigerant Line Sets: Installing Horizontal Runs
Anchored
Heavy Nylon
Wall
Stud
Wire Tie
Metal Sleeve
Figure 6
Refrigerant Line Sets: Transition from Vertical to Horizontal
Automotive
Muffler-Type
Hanger
Strap Liquid
Line to Vapor
Vapor Line Wrapped
–
in Armaflex
Line
Liquid Line
Wall
Stud
Metal Sleeve
Vapor Line Wrapped
–
in Armaflex
Strap Liquid
Line to Vapor
Line
Liquid Line
# 48283B006 Page 5
Figure 7
Refrigerant Line Sets: Installing Vertical Runs (new construction shown)
NOTE: Similar installation practices
should be used if line set is to be
installed on exterior of outside wall.
IMPORTANT:
Refrigerant
lines must not
contact structure.
Wood Block
Between Studs
Vapor Line Wrapped
with Armaflex
Outside Wall
Outside Wall
Liquid Line
Caulk
IMPORTANT: Refrigerant
lines must not contact wall.
Vapor Line
Liquid Line
Wire Tie
Inside Wall
Strap
Sleeve
Wire Tie
Wood Block
Wire Tie
Strap
PVC Pipe
Fiberglass
Insulation
Figure 8
3. Use silver alloy brazing rods (5% or 6% silver alloy for
copper-to-copper brazing or 45% silver alloy for
copper-to-brass or copper-to-steel brazing) which are
rated for use with HCFC-22 refrigerant.
4. Remove the Schrader core assemblies before brazing
to protect them from damage due to extreme heat.
Replace the cores when brazing is complete.
5. Wrap a wet cloth around the valve body and copper tube
stub to protect them from heat damage during brazing.
6. Braze the line set to the service valve. Quench the joints
with water or a wet cloth to prevent heat damage to the
valve core and opening port. The tube end must stay
bottomed in the fitting during final assembly to
ensure proper seating, sealing, and rigidity.
7. Install the factory-supplied fixed orifice (or thermal
expansion valve which is sold separately and which is
approved for use with HCFC-22 refrigerant) in the
liquid line at the indoor coil.
Sleeve
Refrigerant Metering Device
2SCU13 units are designed for use with either fixed orifice
or TXV systems. Refer to the appropriate following section
for information on installing the chosen refrigerant metering device.
Fixed Orifice Systems
2SCU13 units are shipped with a fixed orifice refrigerant
metering device. Replace the existing indoor unit fixed
orifice with the orifice supplied with this unit. Place the
supplied fixed orifice sticker on the indoor cabinet after
installation. See Table 3 for the proper fixed orifice size for
each unit. In nonstandard applications, the provided fixed
orifice may not be appropriately sized.
Install the fixed orifice as shown in Figure 9. Do not twist cap
tubes when loosening the seal nut from the orifice housing.
Use wrench to back up the distributor.
Expansion Valve Systems
Expansion valves equipped with Chatleff-type fittings are
available from the manufacturer. See Table 4 for proper
TXV for each unit.
Page 6 # 48283B006
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