Lenoxx Electronics 41718L098 User Manual
INSTALLATION AND MAINTENANCE
INSTRUCTIONS
SCU 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 ser vice performed by
unqualified persons can result in property
damage, personal injury or death.
WARNING
Before performing maintenance operations on
system, turn off all main power switches to
indoor and outdoor units. Turn off accessory
heater power switch if applicable. Electrical
shock could cause personal injury or death.
TABLE OF CONTENTS
INSTALLATION....................................... 2
START-UP .............................................. 5
MAINTENANCE ..................................... 5
WIRING DIAGRAMS.............................. 6
WARRANTY........................................... 8
Manufactured By
A.A.C.
A Lennox International Company
421 Monroe Street
Bellevue, OH 44811
# 41718L098 Page 1
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INSTALLATION
General
Read this entire instruction manual, as well as the
instructions supplied in separate equipment, bef ore
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 m ust
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.
This unit has been factory charged with a quantity of
refrigerant (R22) sufficient for a matched indoor coil
and 20 feet of refrigerant tubing. If installed with other
indoor sections or with tubing sets other than 20 feet in
length, adjustments to the total system charge must be
made.
The unit has been designed to operate within the range of
indoor and outdoor temperatures as outlined in Table 1.
Following these recommendations will minimiz e component failures and maximize system perf ormance.
Optimum T emperature Range
roodtuO
roodnI
* If extended run times are anticipated below
outdoor temperatures of 65° F, a low ambient kit
must be installed.
ot)muminim(*F°56
)mumixam(F°511
otbwF°75/bdF°26
bwF°27/bdF°09
Table 1
Location of Unit
Install the unit on a solid, level mounting pad. To minimize
transmission of vibration, the pad should not be in direct
contact with any building walls or f oundations.
This outdoor unit has been ARI rated with sev eral Armstrong matching indoor sections for various types of
installations. To obtain optimum performance, a matched
indoor section must be installed. ARI ratings are based on
properly charged systems running at rated indoor cfm
levels . Ductwork should be specified to insure the correct
indoor airflow is obtainable.
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is f ound, 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. An y
concealed damage discovered should be reported to the
last carrier immediately , pref erab ly 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 c laim may be denied.
Check the unit rating plate to confirm specifications
are as ordered.
Limitations
This unit is designed and approved for outdoor use
only .
The outdoor unit must not be installed with any ductwork
in the airstream. The outdoor fan is not designed to
operate against any additional static pressure.
This unit has been designed to be located outdoors with
sufficient clearance for free entrance to the inlet and
discharge air openings. Adequate service clearance must
also be provided. Refer to Figure 1 for a detailed description of minimum clearances. Position the unit to avoid
direct contact of water , sno w or ice from a roof line
overhead.
Av oid placing the unit near quiet areas suc h as
sleeping quarters or study rooms. Normal operating
sound levels may be objectionable if the unit is placed
near certain rooms.
Electrical Wiring
All field wiring must be done in accordance with the
National Electrical Code recommendations, Canadian
Electrical Code and CSA Standards, or local codes, where
applicable. Refer to the unit rating plate for information
needed for wire sizing and branch circuit protection. An
adequately sized branch circuit disconnect should be
installed, per the NEC, within sight of and readily accessible to the unit. Route properly sized copper conductors
from the disconnect to the unit high voltage connections at
the contactor. A properly sized ground wire must be
connected to the ground screw or wire located in the
control panel. T wo low voltage thermostat wires must be
connected to the yellow wires connected to the contactor
coil. Use copper conductors only.
Page 2 # 41718L098
12" CLEARANCE
48" OVERHEAD
CLEARANCE
Minimum Clearances
WEATHERPROOF
DISCONNECT
SWITCH
NEC CLASS 1
WIRING
TO
POWER
SUPPLY
NEC CLASS 2
WIRING
THERMOSTAT
TO
INDOOR
UNIT
TO
EVAPORATOR
COIL
NAMEPLATE
LOCATION
12" CLEARANCE
BOTH SIDES
NOTE: ALL OUTDOOR WIRING
MUST BE WEATHERPROOF
24" SERVICE
ACCESS CLEARANCE
Figure 1
Refrigerant Piping Connections
Check the indoor piston orifice to see if it matches the
required piston for the indoor and outdoor combination being installed. Refer to the refrigerant char ge
label located on the inside of the outdoor unit access
panel for the correct piston orifice size requirements.
Replace the piston orifice with the correct size if this
size is not already installed in the indoor coil.
For optimum system performance, indoor coils
should be washed with a suitable detergent to remove
any residue from the coil manufacturing processes.
Refer to the follo wing instructions when making the
refrigerant piping connections:
SEAL OPENING(S)
WITH PERMAGUM
OR EQUIVALENT
3. Route tubing to fittings on the outdoor unit vapor and
liquid service valves using properly sized refrigerant
grade tubing. Run the refrigerant tubing in as direct a
path as possible avoiding unnecessary turns and
bends.
4. Ensure that the vapor line is insulated properly and
that both vapor and liquid lines are not in direct
contact with floors, walls, ductwork, floor joists or
other piping.
5. After wrapping the service valves with a wet rag,
braze the tubing to the valve connections .
6. After brazing the tubing connections at the indoor coil,
leak test the refrigerant tubing and indoor coil.
1. The unit has been factory charged with refrigerant
(R22) suitable for a matched indoor coil and 20 f eet of
properly sized refrigerant tubing. Ref er to the unit
7. Following the leak test, e vacuate the indoor coil and
line set to a minimum of 500 microns to remove
contamination and moisture.
rating plate for the e xact amount of this f actory charge.
8. After evacuation, open both the vapor and liquid
2. Refer to the refrigerant charge label located on the
service valves fully.
inside surface of the outdoor unit access panel.
Locate the outdoor and indoor models being installed
and note any refrigerant adjustments that must be
made to the system. Adjustments to the system
charge must also be made if an interconnecting line
set other than 20 feet is installed.
# 41718L098 Page 3
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