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Service Literature
The 13ACC is a residential split system condensing unit
with SEER ratings up to 14.80. The series is designed for
use with expansion valves (TXV) and RFC. All 13ACC units
utilize scroll compressors.
13ACC condensing units are available in 2, 2 1/2, 3, 3 1/2, 4
and 5 ton capacities. All major components (indoor blower
and coil) must be matched according to Lennox recommen
dations for the compressor to be covered under warranty.
Refer to the Engineering Handbook for approved system
matchups.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are subject
to change.
This manual is divided into sections which discuss the
major components, refrigerant system, charging proce
dure, maintenance and operation sequence.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a qualified installer or service
agency.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in person
al injury or death.
TABLE OF CONTENTS
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Corp. 0219−L5
13ACC SERIES UNITS
1
2
3
3
6
7
9
. . . . . . . . . . . . . . .
12
Page 1
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal
lation and service to protect the unit's electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
13ACC
2002 Lennox Industries Inc.
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Summary of Contents for Lennox 13ACC Series
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Page 1: Table Of Contents
13ACC condensing units are available in 2, 2 1/2, 3, 3 1/2, 4 and 5 ton capacities. All major components (indoor blower and coil) must be matched according to Lennox recommen dations for the compressor to be covered under warranty. -
Page 2: Specifications
SPECIFICATIONS Cooling Cooling Model No. 13ACC−024 13ACC−030 13ACC−036 13ACC−037 Data Nominal Size − Tons (kW) 2 (7.0) 2.5 (8.8) 3 (10.6) 3 (10.6) Connections Liquid line o.d. − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) (sweat) Suction line o.d. − in. (mm) 3/4 (19.1) 3/4 (19.1) 7/8 (22.2) -
Page 3: Electrical Data
The compressor is energized by a contactor located in the 13ACC UNIT COMPONENTS control box. See figure 2. Single−pole contactors are used OUTDOOR in 13ACC series units. K1 is energized by the indoor ther FAN/MOTOR CONTROL mostat terminal Y1 (24V) when thermostat demand is present. - Page 4 NOTE − During operation, the head of a scroll compressor may be hot since it is in constant contact with discharge gas. The compressor and fan in 13ACC series units use per manent split capacitor motors. The capacitor is located SCROLL FORM inside the unit control box (see figure 2).
- Page 5 SUCTION SUCTION INTERMEDIATE PRESSURE ORBITING SCROLL CRESCENT SHAPED GAS POCKET STATIONARY SCROLL SUCTION POCKET FLANKS SEALED BY CENTRIFUGAL SUCTION SUCTION FORCE MOVEMENT OF ORBIT DISCHARGE HIGH PRESSURE GAS POCKET FIGURE 6 Due to its efficiency, the scroll compressor is capable of draw DANGER ing a much deeper vacuum than reciprocating compres sors.
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Page 6: Refrigerant System
(sweat connections) to the indoor Personal injury and unit damage will result. evaporator coil (flare or sweat connections). Use Lennox L15 (sweat) series line sets as shown in table 1. To Close Liquid or Suction Line Service Valve: TABLE 1 1 −... -
Page 7: Charging
*If line set is greater than 20 ft. (6.1m) add this amount. If line set is less than 20 feet (6.1 m) subtract this amount Units are designed for line sets up to 50 feet (15.2 m). Consult Lennox Refrigerant Piping Manual for line sets over 50 feet (15.2 m). Page 7... - Page 8 C − Evacuating the System D − Charging 1− Attach gauge manifold. Connect vacuum pump (with vac The condensing unit should be charged during warm uum gauge) to center port of gauge manifold. With both weather. However, applications arise in which charging must occur in the colder months.
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Page 9: Maintenance
Expansion Valve Systems Charging Using the Subcooling Method TXV & Fixed Orifice Systems Outdoor Temp. Charging Using the Approach Method > 65_F (18_C) TXV Systems − Outdoor Temp. > 65_F (18_C) If you charge a fixed orifice system when the outdoor ambi IMPORTANT ent is 65_F (18_C) or above, use the subcooling method to charge the unit. - Page 10 Table 4 Subcooling (SC) and Superheat (SH)* Reading s are in °F −024 −030 −036 −037 −042 −047 −048 −060 Out. Coil Metering Metering Entering Entering Device SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 SC+2 SH+2 Air°F (°C) 65 (18.3) 70 (21)
- Page 11 Table 5 Normal Operating Pressures In psig (liquid and suction +/− 2 psig)* Out. Coil −024 −030 −036 −037 −042 −047 −048 −060 Unit / Entering Entering M t i Metering LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC. LIQ. SUC.
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Page 12: Wiring And Operating Sequence
V − WIRING DIAGRAMS AND SEQUENCE OF OPERATION 13ACC 2 THROUGH 5 TON OPERATING SEQUENCE NOTE− The thermostat used may be electromechanical or electronic. NOTE− Transformer in indoor unit supplies power (24 VAC) to the thermostat and outdoor unit controls. COOLING: 1−...