Lennox 2SCU13-18, 2SCU13-24, 2SCU13-30, 2SCU13-36, 2SCU13-42 Installation And Maintenance Instructions Manual
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INSTALLATION AND MAINTENANCE INSTRUCTIONS
2SCU13 Series
with Dry Nitrogen Holding Charge
Split System Air Conditioner
These instructions must be read and understood completely before attempting installation.
NOTICE TO INSTALLER
This unit is factory-charged with DRY NITROGEN. The unit is intended for installation
in existing HCFC-22 systems. Carefully follow all installation procedures.
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
Sharp metal edges can cause injury. When installing
the unit, use care to avoid sharp edges.
TABLE OF CONTENTS
INSTALLATION .................................................... 2
START-UP..........................................................10
OPERATION ...................................................... 14
MAINTENANCE ................................................. 14
CONNECTION DIAGRAMS ............................... 16
WARRANTY ....................................................... 18
*P506874-01*
(P) 506874-01
506874-01 Page 1 of 19Issue 1140
INSTALLATION
Fastener
Torque
Stem Caps
8 ft. lbs.
Service Port Caps
8 ft. lbs.
Sheet Metal Screws
16 in. lbs.
#8 Machine Screws
16 in. lbs.
#10 Machine Screws 28 in. lbs.
Compressor Bolts
90 in. lbs.
General
The 2SCU13 air conditioner, which will also be referred to
in this instruction as the outdoor unit, uses HCFC-22
refrigerant. This outdoor unit is intended as a replacement
outdoor component for use in residential systems which
include an existing indoor coil which is functioning properly.
It is NOT intended for new installations.
This outdoor unit is:
• shipped from the factory with nitrogen holding charge
that must be purged from the unit;
• designed for use with HCFC-22 refrigerant only;
• designed for use in systems that use either a RFC
device (orifice) included with outdoor unit or thermal
expansion valve (TXV). See the 2SCU13 product
specification sheet for approved fixed orifice sizes and
expansion valve kit match ups.
IMPORTANT: The air conditioning unit must have properly
matched system components including indoor unit and
refrigerant metering device. Mismatched equipment may
have an impact on the operation, performance, reliability,
and warranty of the air conditioning unit.
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.
Location of Unit
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
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.
Inspection of Shipment
Torque Table
* 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".
Figure 1
Slab Mounting
When installing unit at grade level, install on level slab high
enough so that water from higher ground will not collect
around unit (see Figure 2).
Page 2 of 19 506874-01Issue 1140
Table 1
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.
Slab Mounting
Discharge Air
Mounting Slab
Ground Level
Building
Structure
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
Figure 2
Thermostat Designations
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.
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.
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.
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).
Figure 3
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.
Refrigerant Piping
WARNING
Refrigerant can be harmful if inhaled. Refrigerant must always
be used and recovered responsibly. Incorrect or irresponsible
use of refrigerant can result in personal injury or death.
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 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 (800) 515-
3501.
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'.
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 3).
506874-01 Page 3 of 19Issue 1140
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 energy
Refrigerant Line Set Diameters (in.)
S uc tio n L ine
B T U H
L ine S e t L e ngth a nd S iz e
12 f t. 25 ft. 5 0 ft. 75 ft. 10 0 ft.
18,000 3/4 3/4 3/4 3/4 3/4
24,000 3/4 3/4 3/4 3/4 7/8
30,000 3/4 3/4 3/4 7/8 7/8
36,000 7/8 7/8 7/8 7/8 1-1/8
42,000 7/8 7/8 7/8 1-1/8 1-1/8
48,000 7/8 7/8 7/8 1-1/8 1-1/8
60,000 1-1/8 1-1/8 1-1/8 1-1/8 1-1/8
L iquid L ine
B T U H
L ine S et L ength a nd S iz e
12 f t. 25 ft. 5 0 ft. 75 f t. 100 ft.
18,000 3/8 3/8 3/8 3/8 3/8
24,000 3/8 3/8 3/8 3/8 3/8
30,000 3/8 3/8 3/8 3/8 1/2
36,000 3/8 3/8 3/8 3/8 1/2
42,000 3/8 3/8 3/8 1/2 1/2
48,000 3/8 3/8 3/8 1/2 1/2
60,000 3/8 3/8 3/8 1/2 1/2
Install unit away
from windows
Two 90° elbows installed in lineset
will reduce lineset vibration
Outside Unit Placement
and Installation
Figure 4
Line Set Isolation
Illustrations on the following pages demonstrate procedures
which ensure proper refrigerant line set isolation. Figure 5
shows how to install line sets on horizontal runs. Figure 6
shows how to make a transition from horizontal to vertical.
Figure 7 on page 6 shows how to install line sets on vertical
runs.
For installations exceeding 50', contact
Technical Services at (800) 515-3501.
Table 2
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 4 shows how to place the outdoor
unit and line set to reduce line set vibration.
Page 4 of 19 506874-01Issue 1140
Brazing Connection Procedure
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.
3. Use silver alloy brazing rods (5% or 6% silver alloy for
copper-to-copper brazing or 45% silver alloy for copperto-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.
Anchored
Heavy Nylon
Wire Tie
Wall
Stud
Metal Sleeve
Vapor Line Wrapped
in Armaflex
–
Liquid Line
Wall
Stud
Automotive
Muffler-Type
Hanger
Strap Liquid
Line to Vapor
Line
Metal Sleeve
Vapor Line Wrapped
in Armaflex
–
Liquid Line
Strap Liquid
Line to Vapor
Line
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
Figure 5
Refrigerant Line Sets: Transition from Vertical to Horizontal
506874-01 Page 5 of 19Issue 1140
Figure 6
Model
Part
Number
Drill
Size
2SCU13- 18
2SCU13- 24
2SCU13- 30
2SCU13- 36
2SCU13- 42
2SCU13- 48
2SCU13- 60
100484-07
100484-12
100484-19
100484-24
100484-26
100484-36
100484-43
.055
.062
.070
.076
.078
.089
.096
Refrigerant Line Sets: Installing Vertical Runs (new construction shown)
Outside Wall
Wood Block
Between Studs
IMPORTANT: Refrigerant
lines must not contact wall.
Vapor Line
Liquid Line
Wire Tie
Inside Wall
Strap
Sleeve
Wire Tie
Wire Tie
Strap
Wood Block
Sleeve
Vapor Line Wrapped
with Armaflex
Liquid Line
Caulk
PVC Pipe
Fiberglass
Insulation
Outside Wall
IMPORTANT:
Refrigerant
lines must not
contact structure.
NOTE: Similar installation practices
should be used if line set is to be installed
on exterior of outside wall.
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.
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. See Table 3 for the proper fixed orifice
size for each unit. In nonstandard applications, the fixed
orifice provided with the indoor unit may not be appropriately
sized to be matched with the 2SCU13 unit. If necessary,
replace the existing indoor unit fixed orifice with the orifice
supplied with the 2SCU13 unit. Place the supplied fixed
orifice sticker on the indoor cabinet after installation.
Page 6 of 19 506874-01Issue 1140
Figure 7
Fixed Orifice Data
Figure 8 shows how to install the replacement fixed orifice.
Do not twist distributor tubes when loosening the seal nut from
the orifice housing. Use wrench to back up the distributor.
Table 3
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