Lenoxx Electronics Air Conditioner 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 per-  
sonal 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 discon-  
nect power supplies can result in property  
damage, personal injury or death.  
TABLE OF CONTENTS  
INSTALLATION....................................... 2  
START-UP .............................................. 5  
MAINTENANCE ..................................... 5  
WIRING DIAGRAMS .............................. 6  
WARRANTY ........................................... 8  
WARNING  
Installation and servicing of air conditioning  
equipment can be hazardous due to internal  
refrigerant pressure and live electrical compo-  
nents. Only trained and qualified service  
personnel should install or service this equip-  
ment. Installation and service performed by  
unqualified persons can result in property  
damage, personal injury or death.  
Manufactured By  
A.A.C.  
A Lennox International Company  
421 Monroe Street  
Bellevue, OH 44811  
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.  
Save these instructions for future reference  
 
# 41718L098  
Page 1  
Minimum Clearances  
TO  
POWER  
SUPPLY  
THERMOSTAT  
WEATHERPROOF  
DISCONNECT  
SWITCH  
TO  
INDOOR  
UNIT  
48" OVERHEAD  
CLEARANCE  
NEC CLASS 1  
WIRING  
12" CLEARANCE  
TO  
EVAPORATOR  
COIL  
NEC CLASS 2  
WIRING  
NAMEPLATE  
LOCATION  
24" SERVICE  
ACCESS CLEARANCE  
SEAL OPENING(S)  
WITH PERMAGUM  
OR EQUIVALENT  
12" CLEARANCE  
BOTH SIDES  
NOTE: ALL OUTDOOR WIRING  
            MUST BE WEATHERPROOF  
Figure 1  
Refrigerant Piping Connections  
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.  
Check the indoor piston orifice to see if it matches the  
required piston for the indoor and outdoor combina-  
tion being installed. Refer to the refrigerant charge  
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.  
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.  
For optimum system performance, indoor coils  
should be washed with a suitable detergent to remove  
any residue from the coil manufacturing processes.  
5. After wrapping the service valves with a wet rag,  
braze the tubing to the valve connections.  
Refer to the following instructions when making the  
refrigerant piping 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 feet of  
properly sized refrigerant tubing. Refer to the unit  
rating plate for the exact amount of this factory charge.  
7. Following the leak test, evacuate the indoor coil and  
line set to a minimum of 500 microns to remove  
contamination and moisture.  
8. After evacuation, open both the vapor and liquid  
service valves fully.  
2. Refer to the refrigerant charge label located on the  
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  
 
Factory charge contains refrigerant for condenser, evapo-  
rator and 20 feet of 3/8” line set. For line set other than 20  
feet, adjust charge at 0.60 oz. per foot of 3/8” o.d. liquid  
line and 1.2 oz. per foot of 1/2”. To obtain optimum  
performance, system charge should be weighed in  
accordance to amount specified on unit rating plate and  
any adjustments for additional line length over 20 feet, as  
stated above.  
toward the compressor. For long vertical risers, additional  
traps are recommended for each additional 20 feet of pipe  
to insure proper oil movement.  
A crankcase heater is recommended for applications  
where additional field added charge results in a system  
with a reciprocating compressor requiring more than 6 lbs.  
of refrigerant or a scroll compressor requiring more than  
10 lbs. of refrigerant.  
System performance may be verified by using the  
refrigerant charging labels provided with each unit.  
In air conditioning systems, horizontal suction lines should  
be slightly sloped toward the condensing unit. Piping must  
avoid dips or low spots can collect oil. To aid in the return  
of oil, a trap should be installed at the bottom of any  
suction riser. The top end of the riser must be pitched  
Suction Line Sizes  
Liquid Line Sizes  
LINE SET LENGTH AND SIZE  
LINE SET LENGTH AND SIZE  
BTU/HR 12 FT. 25 FT.  
50 FT. 75 FT. 100 FT.  
BTU/HR 12 FT. 25 FT.  
50 FT.  
3/8  
75 FT. 100 FT.  
12,000  
18,000  
24,000  
30,000  
36,000  
42,000  
48,000  
60,000  
3/4  
3/4  
3/4  
3/4  
7/8  
7/8  
7/8  
7/8  
3/4  
3/4  
3/4  
3/4  
7/8  
7/8  
7/8  
7/8  
3/4  
3/4  
3/4  
3/4  
7/8  
7/8  
7/8  
7/8  
3/4  
3/4  
3/4  
3/4  
12,000  
18,000  
24,000  
30,000  
36,000  
42,000  
48,000  
60,000  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
1/2  
1/2  
1/2  
3/8  
3/8  
3/8  
1/2  
1/2  
1/2  
1/2  
1/2  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/8  
3/4  
7/8  
7/8  
7/8  
7/8  
1 1/8  
1 1/8  
1 1/8  
1 1/8  
1 1/8  
1 1/8  
1 1/8  
Table 2  
Table 3  
For installations exceeding 100 feet, contact the Armstrong Air Conditioning Inc.  
Technical Services Department at (419) 483-4840.  
Page 4  
# 41718L098  
 
START-UP  
MAINTENANCE  
WARNING  
The procedure for start-up of the unit is as follows:  
1. Operate the unit for a period of at least 15 minutes to  
allow for pressures and temperatures to stabilize.  
Unless matched with an indoor section using an  
expansion valve, the superheat method can be used  
to check the system refrigerant charge. It should be  
noted that this method is not accurate at low load  
conditions or at outdoor ambients above 106° F.  
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.  
Homeowner Maintenance  
2. Using accurate gauges and temperature measuring  
devices, determine the suction line pressure and  
temperature as well as the outdoor ambient tempera-  
ture.  
Leaves and other large obstructions should be carefully  
removed from the outdoor coil surfaces without damaging  
the fin surface of the coil.  
3. Refer to the refrigerant charging instruction label  
located on the inside of the outdoor unit access panel.  
Locate the intersection of the measured outdoor  
temperature and suction line pressure on the chart.  
Routinely clean or change the indoor air filter. Should the  
coil become dirty, thus restricting airflow, call a qualified  
service person to carefully clean the coil surface.  
Dealer Maintenance  
4. If the suction line temperature is higher than the  
intersection temperature, the system is undercharged.  
If the actual suction line temperature is lower than the  
chart temperature, the system is overcharged.  
An annual inspection by a qualified service person should  
be performed to ensure continued quality performance.  
Outdoor coil surfaces should be cleaned, taking care not  
to damage the fin surface of the coil.  
DischargeThermostat (if used)  
Some models come equipped with a discharge thermostat  
(loss of charge control) to guard against the compressor  
overheating from loss of charge. The temperature cut out  
for this control is set at 250°F, as determined by compres-  
sor manufacturer’s recommendation. Discharge tem-  
peratures exceeding 250°F will cause compressor oil  
breakdown that will lead to premature compressor  
failure. If the control trips during unit operation, a problem  
exists within the system. Check for the following as  
possible causes:  
Several weep holes located in the unit base should be  
inspected and cleaned, if necessary, to ensure that proper  
drainage can occur.  
All electrical wiring and connections should be inspected;  
as should all physical connections of individual compo-  
nents within the units.  
Low system charge  
High discharge pressures  
A thorough inspection of the system should be made to  
determine the cause. The discharge gas temperature may  
be verified by attaching an electronic type thermometer or  
thermocouple to the discharge line near the control.  
The control resets automatically. If the unit does not have  
a discharge thermostat, an add-on kit is available.  
# 41718L098  
Page 5  
 
CONNECTION  
DIAGRAM  
EQUIPMENT GROUND  
FAN  
CAPACITOR  
LINE VOLTAGE - FACTORY  
LINE VOLTAGE - FACTORY (IF USED)  
LINE VOLTAGE - FIELD  
LOW VOLTAGE - FACTORY  
LOW VOLTAGE - FACTORY (IF USED)  
LOW VOLTAGE - FIELD  
FAN  
MOTOR  
BROWN  
VIOLET  
RED  
COMP  
T2  
T1  
T3  
CONTACTOR  
NOTE:  
T1  
L1  
L2  
L3  
BLACK  
REPLACEMENT WIRE MUST  
BE THE SAME GAGE AND  
INSULATION THICKNESS,  
105° APPLIANCE WIRING  
MATERIAL.  
T2  
T3  
YEL  
YEL  
DISCHARGE  
THERMOSTAT  
(IF USED)  
HIGH PRESS  
SWITCH  
(IF USED)  
REFER TO RATING  
CONNECT TO “C” AND  
“Y” TERMINALS OF  
INDOOR CONTROL  
CIRCUIT HAVING MIN.  
40 VA, 24 VOLT N.E.C.  
CRANK CASE  
HEATER  
(IF USED)  
PLATE FOR LINE  
VOLTAGE 3 PHASE  
POWER SUPPLY. USE  
MINIMUM 75°C  
COPPER WIRE ONLY.  
CLASS II TRANSFORMER.  
SCHEMATIC  
OF POWER  
CIRCUIT  
OUTDOOR POWER SUPPLY  
L3  
T3  
L2  
L1  
T1  
CRANKCASE HEATER  
COMPRESSOR  
CONTACTOR  
(IF USED)  
T2  
COMPRESSOR  
MOTOR  
T2  
T3  
T1  
FAN  
MOTOR  
TYPICAL  
SCHEMATIC  
OF CONTROL  
CIRCUIT  
R
COMPRESSOR  
CONTACTOR COIL  
HIGH PRESSURE  
SWITCH (IF USED)  
DISCHARGE THERMOSTAT  
(IF USED)  
C
Y
THERMOSTAT TERMINALS  
PART NO. 38942D005  
Figure 3  
Page 6  
# 41718L098  
 
START  
YEL  
ASSIST  
CONNECTION  
DIAGRAM  
START CAP.  
DEVICE  
(IF USED)  
(IF USED)  
START RELAY  
(IF USED)  
COM  
FAN HERM  
2
1
5
LINE VOLTAGE - FACTORY  
LINE VOLTAGE - FACTORY (IF USED)  
LINE VOLTAGE - FIELD  
LOW VOLTAGE - FACTORY  
LOW VOLTAGE - FACTORY (IF USED)  
LOW VOLTAGE - FIELD  
FAN  
COMP  
RUN  
CAP  
RED  
RED  
BROWN  
BLK  
VIOLET  
NOTE:  
BLK  
IF ANY OF THE ORIGINAL  
WIRE IS REPLACED, THE  
SAME SIZE AND TYPE WIRE  
MUST BE USED.  
RED  
CONTACTOR  
COMP  
C
T1  
T2  
L1  
L2  
RR  
S
L1  
L2  
T1  
T2  
YEL  
BLK  
RED  
GROUND  
SCREW  
YEL  
ALT.  
CONTACTOR  
HIGH PRESSURE  
SWITCH  
DISCHARGE  
THERMOSTAT  
(IF USED)  
(IF USED)  
CRANK CASE  
HEATER  
BLUE  
TO SINGLE PHASE  
(IF USED)  
POWER SUPPLY PER  
RATING PLATE WITH  
MINIMUM 75°C COPPER  
WIRE ONLY. CIRCUIT  
PROTECTION PER  
RATING PLATE.  
CONNECT TO “C” AND  
“Y” TERMINALS OF  
LOW PRESSURE  
SWITCH  
INDOOR CONTROL  
(IF USED)  
C C  
CIRCUIT HAVING MIN.  
40 VA, 24 VOLT N.E.C.  
CLASS II TRANSFORMER.  
LOAD  
TIME DELAY RELAY  
T'STAT  
(IF USED)  
SCHEMATIC OF POWER CIRCUIT  
GROUND  
SCREW  
OUTDOOR POWER SUPPLY  
L1  
L2  
T2  
CRANKCASE HEATER  
COMPRESSOR  
CONTACTOR  
(IF USED)  
T1  
R
COMPRESSOR  
C
MOTOR  
S
5
2
R
COMPRESSOR  
RUN  
CAPACITOR  
START  
START RELAY  
(IF USED)  
ASSIST  
DEVICE  
(IF USED)  
1
START CAPACITOR  
(IF USED)  
FAN  
MOTOR  
TYPICAL  
SCHEMATIC  
OF CONTROL  
CIRCUIT  
TDC  
R
COMPRESSOR  
CONTACTOR COIL  
HIGH PRESSURE  
TIME DELAY  
LOW PRESSURE  
DISCHARGE THERMOSTAT  
SWITCH  
RELAY  
SWITCH  
(IF USED)  
(IF USED)  
(IF USED)  
(IF USED)  
C
Y
THERMOSTAT TERMINALS  
PART NO. 38602D008  
Figure 4  
# 41718L098  
Page 7  
 
Limited Warranty  
August 1, 1997  
This warranty gives you specific legal rights and you may have other rights  
which vary from state/province to state/province.  
Warrantor: Armstrong Air Conditioning Inc., 421 Monroe St., Bellevue, OH 44811  
Armstrong Air Conditioning Inc. products are available under the following names: Air Ease, Armstrong Air, American Aire, Concord  
Subject to the limitations stated in this warranty, we warrant to the first buyer for use the residential heating, cooling or heat pump unit,  
when installed, operated and maintained as required by this warranty, to be free of defects in workmanship or material for a period of five  
years (two years for commercial equipment) from the time of installation. We will replace any defective component without cost or  
expense to you except for the costs of delivery and labor for removal and replacement of the defective component.  
The SCU 12, 13 and E Series carry a 10 year compressor warranty. All other SCU Series air conditioners carry a 5 year compres-  
sor warranty.  
Warranty Begins  
The warranty period begins when the installation is complete and the product is ready to operate. You must be able to verify this date  
whenever a warranty claim is made. Original bill of sale, installer’s invoice or other similar document will suffice. If the beginning date  
cannot be verified, we will consider warranty coverage to begin six months after the date the product was shipped from our factory.  
Limitations on Implied Warranties  
Implied warranties of merchantability or, to the extent applicable, fitness for a particular purpose are limited to five years, the same  
duration as the basic limited written warranty provided herein. Some states/provinces do not allow limitations on how long an implied  
warranty of merchantability or fitness lasts, so the above limitations or exclusions may not apply to you.  
Only Warranty  
This written Limited Warranty is the only warranty made by the warrantor; this warranty is in lieu of and excludes all other warranties,  
express or implied. The warrantor does not authorize any person to provide any other warranty or to assume for it any further obligation  
in connection with the warranted product.  
What is NOT Covered  
1. Cabinets or cabinet pieces.  
2. Normal maintenance items such as filters, fan belts, fuses or other consumable items.  
3. Damage caused by misuse, failure to maintain properly, accidents or acts of God.  
4. External wiring, piping, venting or attachment of accessory products not integral to our product, including without limitation,  
humidifier, air cleaner, vent damper, thermostat or other mechanical devices not manufactured by the warrantor.  
5. Products that have been operated in a corrosive atmosphere where a concentration of acids, halogenated hydrocarbons or  
other corrosive elements causes deterioration to metal surfaces or integral components. NOTE: Operation in a corrosive  
atmosphere is considered abuse and voids this warranty.  
6. Products that have NOT been installed in accordance with our published installation instructions, applicable local, state/  
provincial or national codes, ACCA published standards.  
7. Products that have NOT been installed by competent, qualified installers.  
8. Products that have been moved from their original place of installation.  
Warranty on Replacement Components  
Any replacement component furnished by us will assume the remaining (unused) portion of the Limited Warranty.  
Consequential Damages  
The warrantor shall not be responsible for any consequential damages caused by any defect in the product. Some state/provinces do not  
allow the exclusion or limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you.  
NOTE: After the first year, in the event that a gas or oil heat exchanger is no longer being manufactured by the warrantor, the warrantor  
will allow a credit equal to the then current wholesale price of an equivalent heat exchanger towards the purchase of a new Armstrong gas  
or oil furnace.  
This product must be installed, used and cared for in accordance with the instruction manual. You are responsible for required periodic  
maintenance or service, such as changing or cleaning of air filters and lubrication or cleaning of components. Failure to properly install,  
operate or maintain your unit voids this warranty.  
Owner Record  
Model # ________________________ Serial # _________________ Installation Date __________________  
INSTALLED BY:  
Dealer _____________________________________________________________________________________  
Address ____________________________________________________________________________________  
Telephone # ____________________________  
License # _______________________________  
Page 8  
# 41718L098  
 

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