Lennox 13ACC Series User manual

Page 1 2002 Lennox Industries Inc.
Corp. 0219−L5
13ACC
Service Literature
13ACC SERIES UNITS
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
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Data 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I Unit Components 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II Refrigerant System 6. . . . . . . . . . . . . . . . . . . . . . . . . . .
III Charging 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV Maintenance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V Wiring and Operating Sequence 12. . . . . . . . . . . . . . .
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.

Page 2
SPECIFICATIONS
Cooling Model No. 13ACC−024 13ACC−030 13ACC−036 13ACC−037
Cooling
Data Nominal Size − Tons (kW) 2 (7.0) 2.5 (8.8) 3 (10.6) 3 (10.6)
Connections
(t)
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) 7/8 (22.2)
Condenser
Cil
Net face area
ft ( 2)
Outer coil 15.21 (1.41) 15.21 (1.41) 15.21 (1.41) 19.83 (1.84)
Coil  sq. ft. (m2)Inner coil 5.44 (0.51) 14.50 (1.35) 14.50 (1.35) 18.90 (1.76)
Tube diameter − in. (mm) & number of rows 5/16 (8) − 1.37 5/16 (8) − 2 5/16 (8) − 2 5/16 (8) − 2
Fins per inch (m) 22 (866) 22 (866) 22 (866) 22 (866)
sRefrigerant (HCFC22) furnished 5 lbs. 4 oz. (2.38
kg)
6 lbs. 13 oz. (3.09
kg)
7 lbs. 6 oz. (3.35
kg)
9 lbs. 3 oz. (4.17
kg)
Condenser
F
Diameter − in. (mm) & Number of blades 18 (457) − 3 18 (457) − 4 18 (457) − 4 18 (457) − 4
Fan Motor output − hp (W) 1/6 (124) 1/6 (124) 1/6 (124) 1/6 (124)
Cfm (L/s) 2500 (1180) 2450 (1155) 2450 (1155) 2410 (1135)
Rpm 1100 1100 1100 1100
Watts 200 200 200 180
Shipping Data lbs. (kg) 1 package 155 (70) 175 (79) 180 (82) 191 (87)
Optional Accessories – MUST BE ORDERED EXTRA
Compressor Crankcase Heater 18K20 18K20 18K20 18K20
Compressor Monitor (Canada Only) 45F08 45F08 45F08 45F08
Hail Guard 17L73 17L73 17L73
ÉÉÉÉÉÉ
Low Ambient Kit (LB57113BC) 24H77 24H77 24H77 24H77
Plastic
Mti
Model Number − Catalog Number MB2S − 69J06 MB2S − 69J06 MB2S − 69J06 MB2S − 69J06
Mounting
Base
Dimensions − W x D x H − in. 22−1/4 x 22−1/4 x 3 22−1/4 x 22−1/4 x 3 22−1/4 x 22−1/4 x 3 22−1/4 x 22−1/4 x 3
Base mm 565 x 565 x 76 565 x 565 x 76 565 x 565 x 76 565 x 565 x 76
Shipping Weight 6 lbs. (3 kg) 6 lbs. (3 kg) 6 lbs. (3 kg) 6 lbs. (3 kg)
Refrigerant
Li S t
20 ft. (6 m) length L15−41−20 L15−41−20 Not Available Not Available
g
Line Set 30 ft. (9.1 m) length L15−41−30 L15−41−30 L15−65−30 L15−65−30
40 ft. (12.2 m) length L15−41−40 L15−41−40 L15−65−40 L15−65−40
50 ft. (15.2 m) length L15−41−50 L15−41−50 L15−65−50 L15−65−50
Suction Line o.d. − in. (mm) 3/4 (19) 3/4 (19) 7/8 (22.2) 7/8 (22.2)
Liquid Line o.d. − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
Timed−Off Control (LB−50709BK) 47J27 47J27 47J27 47J27
Unit StandOff Kit 94J45 94J45 94J45 94J45
*Refrigerant charge sufficient for 20 ft. (6.1 m) length of refrigerant lines.
Cooling Model No. 13ACC−042 13ACC−047 13ACC−048 13ACC−060
Cooling
Data Nominal Size − Tons (kW) 3.5 (12.3) 4 (14.1) 4 (14.1) 5 (17.6)
Connections
(t)
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) 7/8 (22.2) 11/8 (28.6) 7/8 (22.2) 11/8 (28.6)
Condenser
Cil
Net face area
ft ( 2)
Outer coil 15.21 (1.41) 24.5 (2.28) 21.11 (1.96) 21.11 (1.96)
Coil  sq. ft. (m2)Inner coil 14.50 (1.35) 23.56 (2.19) 20.31 (1.89) 20.31 (1.89)
Tube diameter − in. (mm) & number of rows 5/16 (8) − 2 5/16 (8) − 2 5/16 (8) − 2 5/16 (8) − 2
Fins per inch (m) 22 (866) 22 (866) 22 (866) 22 (866)
sRefrigerant (HCFC22) furnished 7 lbs. 14 oz. (3.57 kg) 11 lbs. 1 oz. (5.02 kg) 10 lbs. 1 oz. (4.56 kg) 10 lbs. 11 oz. (4.85 kg)
Condenser
F
Diameter − in. (mm) & Number of blades 18 (457) − 4 22 (559) − 4 22 (559) − 4 22 (559) − 4
Fan Motor output − hp (W) 1/3 (249) 1/4 (186) 1/3 (249) 1/3 (249)
Cfm (L/s) 2930 (1385) 3830 (1805) 3890 (1835) 3890 (1835)
Rpm 1100 825 1085 1085
Watts 310 330 375 375
Shipping Data lbs. (kg) 1 package 186 (84) 226 (103) 250 (113) 254 (115)
Optional Accessories – MUST BE ORDERED EXTRA
Compressor Crankcase Heater 18K20 18K20 18K20 18K20
Compressor Monitor (Canada Only) 45F08 45F08 45F08 45F08
Hail Guard 17L73
ÉÉÉÉÉÉ
17L74 17L74
Low Ambient Kit (LB57113BC) 24H77 24H77 24H77 24H77
Plastic
Mti
Model Number − Catalog Number MB2S − 69J06 MB2L − 69J07 MB2L − 69J07 MB2L − 69J07
Mounting
Base
Dimensions − W x D x H − in. 22−1/4 x 22−1/4 x 3 32 x 34 x 3 32 x 34 x 3 32 x 34 x 3
Base mm 565 x 565 x 76 813 x 864 x 76 813 x 864 x 76 813 x 864 x 76
Shipping Weight 6 lbs. (3 kg) 15 lbs. (7 kg) 15 lbs. (7 kg) 15 lbs. (7 kg)
Refrigerant
Li S t
20 ft. (6 m) length Not Available Field Fabricate Not Available Field Fabricate
g
Line Set 30 ft. (9.1 m) length L15−65−30 Field Fabricate L15−65−30 Field Fabricate
40 ft. (12.2 m) length L15−65−40 Field Fabricate L15−65−40 Field Fabricate
50 ft. (15.2 m) length L15−65−50 Field Fabricate L15−65−50 Field Fabricate
Suction Line o.d. − in. (mm) 7/8 (22.2) 1−1/8 (28.5) 7/8 (22.2) 1−1/8 (28.5)
Liquid Line o.d. − in. (mm) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5) 3/8 (9.5)
Timed−Off Control (LB−50709BK) 47J27 47J27 47J27 47J27
Unit StandOff Kit 94J45 94J45 94J45 94J45
*Refrigerant charge sufficient for 20 ft. (6.1 m) length of refrigerant lines.

Page 3
Torque requirements
Part Recommended Torque
Service Valve Cap 8 ft. − lb 11 NM
Sheet metal screws 16 in. − lb. 2 NM
Machine screws #10 28 in. − lb. 3 NM
Compressor bolts 90 in. − lb. 10 NM
Gauge port seal cap 8 ft. − lb. 11 NM
ELECTRICAL DATA
General
Data
Model No. 13ACC−024
−230
13ACC−030
−230
13ACC−036
−230
13ACC−037
−230
13ACC−042
−230
13ACC−047
−230
13ACC−048
−230
13ACC−060
−230
Line voltage data − 60 hz 208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
208/230v −
1ph
Rec. Max. fuse size (amps) 20 30 35 30 35 40 50 60
Minimum circuit ampacity 14.0 18.0 20.4 19.5 22.5 24.6 31.5 38.0
Compressor Rated load amps 10.3 13.5 15.4 14.7 16.5 18.3 23.7 28.9
Power factor .96 .96 .96 .98 .98 .94 .96 .96
Locked rotor amps 56.0 72.5 88.0 83.0 95.0 109.0 129.0 169.0
Outdoor Coil
Fan Motor
Full load amps 1.1 1.1 1.1 1.1 1.9 1.7 1.9 1.9
Fan Motor Locked rotor amps 1.9 1.9 1.9 1.9 4.1 3.1 4.1 4.1
*Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.
NOTE  Extremes of operating range are plus 10% and minus 5% of line voltage.
I − UNIT COMPONENTS
COMPRESSOR
CONTROL
BOX
SUCTION LINE
SERVICE VALVE
DISCHARGE LINE
OUTDOOR
FAN/MOTOR
13ACC UNIT COMPONENTS
FIGURE 1
LIQUID LINE
SERVICE VALVE
SUCTION
LINE
A − Control Box (Figure 2)
13ACC units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
Electrical openings are provided under the control box cov
er. Field thermostat wiring is made to colorcoded pigtail
connections.
1 − Compressor Contactor K1
The compressor is energized by a contactor located in the
control box. See figure 2. Single−pole contactors are used
in 13ACC series units. K1 is energized by the indoor ther
mostat terminal Y1 (24V) when thermostat demand is
present.
FIGURE 2
DUAL CAPACITOR
(C12)
TIMED OFF
CONTROL. (TOC)
(OPTION)
COMPRESSOR
CONTACTOR
(K1)
13ACC UNIT CONTROL BOX
GROUNDING
LUG
DANGER
13ACC units use singlepole con
tactors. One leg of compressor,
capacitor and condenser fan are
connected to line voltage at all
times. Potential exists for electri
cal shock resulting in injury or
death. Remove all power at dis
connect before servicing.
Can cause personal injury or death.

Page 4
2 − Dual Capacitor C12
The compressor and fan in 13ACC series units use per
manent split capacitor motors. The capacitor is located
inside the unit control box (see figure 2). A single dual"
capacitor (C12) is used for both the fan motor and the
compressor (see unit wiring diagram). The fan side and
the compressor side of the capacitor have different MFD
ratings. Ratings will be on compressor nameplate and
condenser fan nameplate.
3 − Timed Off Control TOC (option)
The time delay is electrically connected between thermo
stat terminal Y and the compressor contactor. Between
cycles, the compressor contactor is delayed for 5 minutes ±
2 minutes but may last as long as 8 minutes. At the end of
the delay, the compressor is allowed to energize. When
thermostat demand is satisfied, the time delay opens the
circuit to the compressor contactor coil and the compressor
is de−energized.
Without the time delay it would be possible to short cycle
the compressor. A scroll compressor, when short cycled,
can run backward if head pressure is still high. It does not
harm a scroll compressor to run backward, but it could
cause a nuisance tripout of safety limits (internal overload).
For this reason, if a TOC delay should fail, it must be re
placed. Do not bypass the control.
B − Compressor
FIGURE 3
SCROLL COMPRESSOR
DISCHARGE
SUCTION
All 13ACC units utilize a scroll compressor. The scroll com
pressor design is simple, efficient and requires few moving
parts. A cutaway diagram of the scroll compressor is shown in
figure 3. The scrolls are located in the top of the compressor
can and the motor is located just below. The oil level is immedi
ately below the motor.
The scroll is a simple compression concept centered around
the unique spiral shape of the scroll and its inherent properties.
Figure 4 shows the basic scroll form. Two identical scrolls are
mated together forming concentric spiral shapes (figure 5).
One scroll remains stationary, while the other is allowed to "or
bit" (figure 6). Note that the orbiting scroll does not rotate or
turn but merely orbits the stationary scroll.
NOTE − During operation, the head of a scroll compressor may
be hot since it is in constant contact with discharge gas.
FIGURE 4
SCROLL FORM
FIGURE 5
STATIONARY SCROLL
ORBITING SCROLL
DISCHARGE
SUCTION
CROSS−SECTION OF SCROLLS
TIPS SEALED BY
DISCHARGE PRESSURE
DISCHARGE
PRESSURE
The counterclockwise orbiting scroll draws gas into the outer
crescent shaped gas pocket created by the two scrolls (figure
6 − 1). The centrifugal action of the orbiting scroll seals off the
flanks of the scrolls (figure 6 − 2). As the orbiting motion contin
ues, the gas is forced toward the center of the scroll and the
gas pocket becomes compressed (figure 6 − 3). When the
compressed gas reaches the center, it is discharged vertically
into a chamber and discharge port in the top of the compressor
(figure 5). The discharge pressure forcing down on the top
scroll helps seal off the upper and lower edges (tips) of the
scrolls (figure 5). During a single orbit, several pockets of gas
are compressed simultaneously providing smooth continuous
compression.
The scroll compressor is tolerant to the effects of liquid return.
If liquid enters the scrolls, the orbiting scroll is allowed to sepa
rate from the stationary scroll. The liquid is worked toward the
center of the scroll and is discharged. If the compressor is re
placed, conventional Lennox cleanup practices must be used.

Page 5
12
34
SUCTION
POCKET
SUCTION
ORBITING SCROLL
STATIONARY SCROLL
SUCTION SUCTION
DISCHARGE
POCKET
SUCTION INTERMEDIATE PRESSURE
GAS
CRESCENT
SHAPED
GAS POCKET
HIGH PRESSURE GAS
FLANKS SEALED
BY CENTRIFUGAL
FORCE
MOVEMENT OF ORBIT
FIGURE 6
Due to its efficiency, the scroll compressor is capable of draw
ing a much deeper vacuum than reciprocating compres
sors. Deep vacuum operation can cause internal fusite
arcing resulting in damaged internal parts and will result
in compressor failure. Never use a scroll compressor for
evacuating or to pump system into a vacuum. This type
of damage can be detected and will result in denial of
warranty claims.
The scroll compressor is quieter than a reciprocating com
pressor, however, the two compressors have much different
sound characteristics. The sounds made by a scroll com
pressor do not affect system reliability, performance, or indi
cate damage.
See compressor nameplate or ELECTRICAL DATA for
compressor specifications.
C − Condenser Fan Motor
All units use single−phase PSC fan motors which require a run
capacitor. In all units, the condenser fan is controlled by
the compressor contactor.
ELECTRICAL DATA tables in this manual show specifi
cations for condenser fans used in 13ACCs.
Access to the condenser fan motor on all units is gained
by removing the seven screws securing the fan assem
bly. See figure 7. The condenser fan motor is removed
from the fan guard by removing the four nuts found on
the top panel. Drip loops should be used in wiring when
servicing motor. See figure 8 if condenser fan motor re
placement is necessary.
Make sure all power is disconnected before
beginning electrical service procedures.
DANGER
FAN
CONDENSER FAN MOTOR
AND COMPRESSOR ACCESS
Remove (7) screws
REMOVE (7) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/FAN
ASSEMBLY.
MOTOR
FAN GUARD
WIRING
FIGURE 7
RACEWAY
Remove (4) nuts
ALIGN FAN HUB FLUSH WITH END OF SHAFT
FIGURE 8

Page 6
II − REFRIGERANT SYSTEM
A − Plumbing
Field refrigerant piping consists of liquid and suction lines
from the condensing unit (sweat connections) to the indoor
evaporator coil (flare or sweat connections). Use Lennox
L15 (sweat) series line sets as shown in table 1.
TABLE 1
Condensing
Unit
Line Set
Model No.
(L10 or
Length of
Lines
Liquid Line
Outside Dia.
Suction Line
Outside Dia.
Unit
Model No. (L10 or
L15) ft. m in. mm in. mm
L154120 20 6
13ACC024
13ACC030
L154130 30 9
3/8
95
3/4
19
13ACC030
L154140 40 12
3/8 9.5 3/4 19
L154150 50 15
13ACC036 L156530 30 9
13ACC036
13ACC037
13ACC042 L156540 40 12 3/8 9.5 7/8 22.2
13ACC042
13ACC048 L156550 50 15
13ACC047
13ACC060 *Notavailable 3/8 9.5 11/8 28.5
*Field fabricate.
The liquid and suction line service valves (figures 9 and 10)
and gauge ports are accessible from outside the unit.
The valve is equipped with a service port. The service ports
are used for leak testing, evacuating, charging and checking
charge. A schrader valve is factory installed. A service port cap
is supplied to protect the schrader valve from contamination
and serve as the primary leak seal.
NOTEAlways keep valve stem caps clean.
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is completed, replace service port cap.
Tighten finger tight, then an additional 1/6 turn.
To Open Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and 5/16" hex head extension
back the stem out counterclockwise until the valve stem
just touches the retaining ring.
3 − Replace stem cap and tighten finger tight, then tighten
an additional 1/6 turn.
Do not attempt to backseat this valve. Attempts to
backseat this valve will cause snap ring to explode
from valve body under pressure of refrigerant.
Personal injury and unit damage will result.
DANGER
To Close Liquid or Suction Line Service Valve:
1 − Remove stem cap with an adjustable wrench.
2 − Using service wrench and 5/16" hex head extension, turn
stem clockwise to seat the valve. Tighten firmly.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
FIGURE 9
LIQUID LINE SERVICE VALVE (VALVE OPEN)
SCHRADER
VALVE
SERVICE
PORT
SERVICE
PORT
CAP
INSERT HEX
WRENCH HERE
INLET
(TO INDOOR COIL)
OUTLET
(TO COMPRESSOR)
STEM CAP
SCHRADER VALVE OPEN
TO LINE SET WHEN VALVE IS
CLOSED (FRONT SEATED)
SERVICE
PORT
SERVICE
PORT CAP
RETAINING RING STEM CAP
OUTLET
(TO COMPRESSOR) INSERT HEX
WRENCH HERE
LIQUID LINE SERVICE VALVE (VALVE CLOSED)
(VALVE FRONT
SEATED)
INLET
(TO INDOOR COIL)

Page 7
B − Service Valves
Suction Line (Ball Type) Service Valve
A balltype full service valve is used on all 13ACC units.
Valves are not rebuildable. If a valve has failed it must be re
placed. A ball valve is illustrated in figure 10.
The ball valve is equipped with a service port. A schrader valve
is factory installed. A service port cap is supplied to protect the
schrader valve from contamination and assure a leak free
seal.
SUCTION LINE (BALL TYPE) SERVICE VALVE
(VALVE OPEN)
FIGURE 10
SCHRADER CORE
SERVICE PORT
SERVICE
PORT
CAP
STEM CAP
INLET
(FROM INDOOR COIL)
OUTLET
(TO COMPRESSOR)
STEM
USE ADJUSTABLE WRENCH
ROTATE STEM CLOCKWISE 90_TO CLOSE
ROTATE STEM COUNTERCLOCKWISE 90_TO OPEN
BALL
(SHOWN OPEN)
III − CHARGING
The unit is factory−charged with the amount of R−22 refrig
erant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with a 20
foot (6.1 m) line set. For varying lengths of line set, refer to
table 2for refrigerant charge adjustment. A blank space is pro
vided on the unit rating plate to list actual field charge.
IMPORTANT
If line length is greater than 20 feet (6.1 m) add this
amount. If line length is less than 20 feet (6.1 m),
subtract this amount.
LIQUID LINE
3/8 in. (10 mm)
TABLE 2
Ounce per 5 foot (ml per mm) adjust
from 20 foot (6.1m) line set*
*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
SET DIAMETER
3 ounce per 5 feet (90 ml per 1524 mm)
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).
A − Pumping Down System
CAUTION
Deep vacuum operation (operating compressor at 0
psig or lower) can cause internal fusite arcing
resulting in a damaged or failed compressor. This
type of damage will result in denial of warranty claim.
The system may be pumped down when leak checking the
line set and indoor coil or making repairs to the line set or
indoor coil.
1− Attach gauge manifold.
2− Front seat (close) liquid line valve.
3− Start outdoor unit.
4− Monitor suction gauge. Stop unit when 0 psig is reached.
5− Front seat (close) suction line valve.
B − Leak Testing (To Be Done
Before Evacuating)
1− Attach gauge manifold and connect a drum of dry nitro
gen to center port of gauge manifold.
2− Open high pressure valve on gauge manifold and
pressurize line set and indoor coil to 150 psig (1034
kPa).
3− Check lines and connections for leaks.
NOTE−The preferred method is to use an electronic leak or
Halide detector. Add a small amount of R22 (3 to 5 psig
[20kPa to 34kPa]) then pressurize with nitrogen to 150 psig.
4− Release nitrogen pressure from the system, correct any
leaks and recheck.
CAUTION
When using dry nitrogen, a pressure reducing reg
ulator must be used to prevent excessive pres
sure in gauge manifold, connecting hoses, and
within the system. Regulator setting must not ex
ceed 150 psig (1034 kpa). Failure to use a regulator
can cause equipment failure resulting in injury.

Page 8
C − Evacuating the System
1− Attach gauge manifold. Connect vacuum pump (with vac
uum gauge) to center port of gauge manifold. With both
manifold service valves open, start pump and evacuate
indoor coil and refrigerant lines.
IMPORTANT
A temperature vacuum gauge, mercury vacuum
(U−tube), or thermocouple gauge should be used.
The usual Bourdon tube gauges are not accurate
enough in the vacuum range.
IMPORTANT
The compressor should never be used to evacu
ate a refrigeration or air conditioning system.
2− Evacuate the system to 29 inches (737mm) vacuum.
During the early stages of evacuation, it is desirable to
stop the vacuum pump at least once to determine if there
is a rapid loss of vacuum. A rapid loss of vacuum would
indicate a leak in the system and a repeat of the leak test
ing section would be necessary.
3− After system has been evacuated to 29 inches
(737mm), close gauge manifold valves to center port,
stop vacuum pump and disconnect from gauge man
ifold. Attach an upright nitrogen drum to center port of
gauge manifold and open drum valve slightly to purge
line at manifold. Break vacuum in system with nitro
gen pressure by opening manifold high pressure
valve. Close manifold high pressure valve to center
port.
4− Close nitrogen drum valve and disconnect from
gauge manifold center port. Release nitrogen pres
sure from system.
5− Connect vacuum pump to gauge manifold center
port. Evacuate system through manifold service
valves until vacuum in system does not rise above
.5mm of mercury absolute pressure or 500 microns
within a 20−minute period after stopping vacuum pump.
6− After evacuation is complete, close manifold center port,
and connect refrigerant drum. Pressurize system
slightly with refrigerant to break vacuum.
D − Charging
The condensing unit should be charged during warm
weather. However, applications arise in which charging
must occur in the colder months. The method of charging is
determined by the unit’s refrigerant metering device and
the outdoor ambient temperature.
Measure the liquid line temperature and the outdoor ambi
ent temperature as outlined below:
1. −Connect the manifold gauge set to the service valves:
low pressure gauge to suction valve service port; high
pressure gauge to liquid valve service port. Connect
the center manifold hose to an upright cylinder of
HCFC22. Close manifold gauge set valves.
2. − Set the room thermostat to call for heat. This will create
the necessary load for properly charging the system in
the cooling cycle.
3. −Use a digital thermometer to record the outdoor ambi
ent temperature.
4. −When the heating demand has been satisfied, switch
the thermostat to cooling mode with a set point of 68_F
(20_C). When pressures have stabilized, use a digital
thermometer to record the liquid line temperature.
5. −The outdoor temperature will determine which charg
ing method to use. Proceed with the appropriate charg
ing procedure.
Weighing in the Charge Fixed Orifice or
TXV Systems  Outdoor Temp < 65_F (18_C)
If the system is void of refrigerant, or if the outdoor ambient
temperature is cool, the refrigerant charge should be
weighed into the unit according to the total amount shown
on the unit nameplate. This may be done after any leaks
have been repaired. If weighing facilities are not available
or if unit is being charged during warm weather, follow one
of the other procedures outlined below.
1 − Recover the refrigerant from the unit.
2 − Conduct a leak check, then evacuate as previously
outlined.
3 − Weigh in the factory charge according to the amount
recorded on the outdoor unit nameplate.

Page 9
Expansion Valve Systems
Charging Using the Approach Method
TXV Systems − Outdoor Temp. > 65_F (18_C)
IMPORTANT
The following procedure requires accurate read
ings of ambient (outdoor) temperature, liquid
temperature and liquid pressure for proper
charging. Use a thermometer with accuracy of +2
°F (+ 1.1°C) and a pressure gauge with accuracy
of +5 PSIG ( +34.5 kPa).
When an expansion valve system is being charged when
the outdoor ambient temperature is 65_F (16_C) or above,
it is best to charge the unit using the approach method.
Subtract the outdoor ambient temperature from the liquid
line temperature to determine the Approach temperature.
(Liquid Line _F (_C) − Outdoor Ambient _F (_C) = Ap
proach Temperature.) The resulting difference (Approach
temperature) should agree with the values given in table 3.
If not, add refrigerant to lower the approach temperature or
recover refrigerant from the system to increase the ap
proach temperature.
Table 3
Approach Temperatures
(TXV Systems Only)
Model No. Approach Temperature
Liquid Line − Outdoor Ambient _F (_C)
13ACC−024 9 (5) + 1
13ACC−030 6 (3) + 1
13ACC−036 10 (6) + 1
13ACC−037 12 (7) + 1
13ACC−042 8 (4) + 1
13ACC−048 7 (4) + 1
13ACC−047 10 (6) + 1
13ACC−060 12 (7) + 1
NOTE − For best results, use the same digital thermometer to check
both outdoor ambient and liquid temperatures.
Charging Using the Subcooling Method
TXV & Fixed Orifice Systems  Outdoor Temp.
>65_F (18_C)
If you charge a fixed orifice system when the outdoor ambi
ent is 65_F (18_C) or above, use the subcooling method to
charge the unit.
1 − With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital ther
mometer to record the liquid line temperature.
2 − At the same time, record the liquid line pressure reading.
3 − Use a temperature/pressure chart for HCFC22 to de
termine the saturation temperature for the liquid line
pressure reading.
4 − Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine sub
cooling. (Saturation temperature − Liquid line tem
perature = Subcooling)
5 − Compare the subcooling value with those in table 4. If
subcooling is greater than shown, some refrigerant
must be recovered. If subcooling is less than shown,
some refrigerant must be added.
E − Oil Charge
Refer to compressor nameplate.
IV − MAINTENANCE
Make sure all power is disconnected before
beginning electrical service procedures.
DANGER
At the beginning of each cooling season, the system should be
cleaned as follows:
A − Outdoor Unit
1 − Clean and inspect condenser coil. (Coil may be
flushed with a water hose).
2 − Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
NOTEOutdoor fan motors are permanently
lubricated.
B − Indoor Coil
1 − Clean coil if necessary.
2 − Check connecting lines and coil for evidence of oil
leaks.
3 − Check condensate line and clean if necessary.
C − Indoor Unit
1 − Clean or change filters.
2 − Bearings are prelubricated and need no further oiling.
3 − Check all wiring for loose connections.
4 − Check for correct voltage at unit.
5 − Check amp−draw on blower motor.
Unit nameplate_________Actual_________.

Page 10
Table 4
Subcooling (SC) and Superheat (SH)*
Reading s are in °F
Metering Out. Coil
Entering
−024 −030 −036 −037 −042 −047 −048 −060
Metering
Device Entering
Air°F (°C) SC+2SH+2SC+2SH+2SC+2SH+2SC+2SH+2SC+2SH+2SC+2SH+2SC+2SH+2SC+2SH+2
65 (18.3) 9 17 9 13 7 20 8 19 8 18 9 19 11 27 16 21
70 (21) 9 16 8 14 7 18 8 18 8 18 10 19 10 26 15 20
75 (23.9) 8 17 8 14 8 18 8 18 8 18 10 18 10 24 14 18
80 (27) 8 17 8 14 8 17 8 18 9 18 10 17 10 24 13 17
13ACC
85 (29.4) 7 17 8 15 8 18 8 17 9 18 10 19 9 23 13 17
13ACC
TXV 90 (32) 6 18 9 16 8 18 9 16 9 19 9 17 9 23 13 17
TXV
95 (35) 6 18 9 17 8 19 7 16 9 19 9 17 9 23 13 17
100 (38) 6 19 9 17 8 20 8 16 9 19 9 18 9 23 12 17
105 (40.6) 7 19 8 17 8 20 9 17 10 19 9 19 9 24 12 18
110 (43) 6 20 8 17 8 20 8 18 10 19 9 19 8 24 10 18
115 (45) 6 21 9 17 9 22 8 19 11 20 9 18 7 24 10 17
RFC SIZE 0.063
42J4301
0.071
42J4701
0.078
42J5101
0.077
42J5001
0.079
25M5601
0.084
42J5401
0.093
78L7401
0.099
42J6201
Out. Coil
Entering
Air°F (°C)
SC+1SH+1SC+1SH+1SC+1SH+1SC+1SH+1SC+1SH+1SC+1SH+1SC+1SH+1SC+1SH+1
65 (18.3) 14 25 10 29 12 32 10 32 13 30 8 29 13 36 19 31
70 (21) 14 24 10 29 11 30 9 29 13 28 8 28 13 33 18 29
75 (23.9) 13 24 10 28 11 28 10 27 12 26 7 27 13 30 18 27
13ACC
RFC
80 (27) 12 23 10 25 10 27 9 25 11 24 7 25 13 29 17 25
RF
C
85 (29.4) 11 22 9 22 8 25 9 22 10 22 7 24 12 27 16 22
90 (32) 9 21 8 20 7 22 8 18 9 19 6 22 11 25 15 20
95 (35) 8 19 7 15 7 19 8 16 8 17 6 20 10 23 14 18
100 (38) 7 18 6 9 5 14 8 6 8 13 6 17 10 20 13 14
105 (40.6) 5 16 6 3 4 11 8 2 7 9 5 11 10 15 13 9
110 (43) 4 13 5 4 3 5 7 1 5 3 5 4 9 11 12 3
115 (45) 4 7 4 2 3 2 6 1 4 2 4 1 8 2 10 2
* Reading taken at compressor.