Lennox HS24-141 Installation and operation manual

SERVICE HS24
UNIT
INFORMATION
Page 1 1992 Lennox Industries Inc.
Corp. 9201ĆL1 Litho U.S.A.
HS24 SERIES UNITS
The HS2 is a highĆefficiency residential splitĆsystem conĆ
densing unit. Extra large condensing coil, coil circuiting
and high condenser air volume result in a high SEER rating
(minimum of 10.0). The series is designed for use with an
expansion valve or RFCII system in the indoor unit.
All compressors are hermetically sealed for troubleĆfree
operation and long service life. Compressor components
are spring mounted within the sealed housing. The comĆ
pressor is installed in the unit on resilient rubber mounts to
assure quiet, vibrationĆfree operation. A builtĆin protection
device assures protection from excessive current and temĆ
peratures.
HS2 -510 through HS2 -650 models are furnished with
crankcase heaters as standard equipment to assure proper
compressor lubrication at all times. The heater is temperaĆ
tureĆactuated and operates only when required.
Several models are available in sizes ranging from 1
through 5 tons.
This manual is divided into sections which discuss the maĆ
jor components, refrigerant system, charging procedure,
maintenance and operation sequence.
All specifications in this manual are subject to change.
SPECIFICATIONS
Model No. HS24Ć141 HS24Ć211 HS24Ć261 HS24Ć311
N t f ( ft )
12 60
12 60
12 60
1 70
Net face area (sq. ft.) 12.60 12.60 12.60 1 .70
Condenser
Coil
Tube diameter (in.) & no. of rows 3/8 Ċ 1 3/8 Ċ 1 3/8 Ċ 1 3/8 Ċ 1
Coil Fins per inch 20 20 20 20
Diameter (in.) & no. of blades 20 Ċ 3 20 Ċ 3 20 Ċ 3 20 Ċ 3
Condenser Motor hp 1/6 1/6 1/6 1/6
Fan Cfm 2500 2500 2500 2700
Rpm 850 850 850 850
Watts 200 200 200 205
*Refrigerant Ċ 22 charge furnished lbs. 5 oz. lbs. 10 oz. 5 lbs. 7 oz. 5 lbs. 12 oz.
Liquid line (o.d. in.) connection (sweat) **3/8 ***3/8 ***3/8 3/8
Suction line (o.d. in.) connection (sweat) 1/2 5/8 5/8 3/
Shipping weight (lbs.) 1 package 121 153 15 168
*Refrigerant charge sufficient for 25 ft. length of refrigerant lines.
** 3/8" x 1/ " reducer furnished to adapt to 1/ field fabricated line set.
*** 3/8" x 5/16" reducer furnished to adapt unit to 5/16" line set.

Page 2
SPECIFICATIONS (cont nued)
Model No. HS24Ć411
HS24Ć413
HS24Ć461
HS24Ć463
HS24Ć511
HS24Ć513
HS24Ć651
HS24Ć653
Net face area Outer coil 1 .70 1 .70 20.00 20.00
Condenser (sq. ft.) Inner coil Ć Ć Ć Ć 9.80 Ć Ć Ć Ć 15. 0
Coil Tube diameter (in.) & no. of rows 3/8 Ċ 1 3/8 Ċ 1.67 3/8 Ċ 1 3/8 Ċ 1.77
Fins per inch 20 20 20 20
Diameter (in.) & no. of blades 20 Ċ 3 20 Ċ 3 2 Ċ 2 Ċ
Condenser Motor hp 1/6 1/6 1/ 1/
Fan Cfm 2700 2 50 3900 000
Rpm 8 0 8 0 835 830
Watts 205 210 3 0 355
*Refrigerant Ċ 22 charge furnished 5 lbs. 15 oz. 9 lbs. 6 oz. 9 lbs. 0 oz. 11 lbs. 5 oz.
Liquid line (o.d. in.) connection (sweat) 3/8 3/8 3/8 3/8
Suction line (o.d. in.) connection (sweat) 3/ 7/8 7/8 1Ć1/8
Shipping weight (lbs.) 1 package 182 223 238 271
*Refrigerant charge sufficient for 25 ft. length of refrigerant lines.
I - UNIT INFORMATION
HS2 condensing units are available in 1, 1 Ć1/2, 2, 2 Ć1/2,
3, 3 Ć1/2, and 5 ton capacities.
All major components (indoor blower/coil) must be
matched according to Lennox recommendations for the
compressor to be covered under warranty. Refer to the EnĆ
gineering Handbook for approved system matchups. A
misapplied system will cause erratic operation and can reĆ
sult in early compressor failure.
II - UNIT COMPONENTS
A - Control Box (F gures 1 and 2)
FIGURE 1
DUAL CAPACITOR
(C12)
START
CAPACITOR
(C7)
POTENTIAL
RELAY K31
(461,511,651)
COMPRESSOR
CONTACTOR
(K1)
HS24 UNIT CONTROL BOX
SINGLE PHASE
GROUNDING
LUG
FIGURE 2
FAN
CAPACITOR
(C1)
HS24 UNIT CONTROL BOX ALL
THREE PHASE UNITS
TRANSFORMER(T5)
J" VOLTAGE
UNITS ONLY
GROUNDING
LUG
COMPRESSOR
CONTACTOR
(K1)
DANGER
Shock Hazard
All s ngle phase HS24 un ts use
s ngleĆpole contactors. One leg of
compressor, capac tor and conĆ
denser fan are connected to l ne
voltage at all t mes. Potent al exĆ
sts for electr cal shock result ng
n njury or death. Remove all powĆ
er at d sconnect before serv c ng.
Can cause personal njury or death.

Page 3
1 - Compressor Contactor K1
The compressor is energized by a contactor located in the
control box. See figures 1 and 2. Contactors are SPST in
single phase units and 3PST in three phase units. The conĆ
tactor is energized by indoor thermostat terminal Y when
thermostat demand is present.
The contactor coil is energized by 2 VAC supplied by the
indoor unit. All other controls in the outdoor unit are powĆ
ered by line voltage. Refer to unit wiring diagram. The
HS2 is not equipped with a line voltage to 2 V transformĆ
er.
2 - Dual Capac tor C12
The compressor and fan in single phase units use permanent
split capacitor motors. The capacitor is located inside the unit
control box (see figure 1). A single dual" capacitor (C12) is
used for both the fan motor and the compressor (see unit wirĆ
ing diagram). The fan side and the compressor side of the caĆ
pacitor have different MFD ratings. See table 1 for dual capacĆ
itor ratings.
TABLE 1
Un t MFD VAC
HS24 (C12) DUAL CAPACITOR RATING
HS2 -261
HS2 -311/ 11
HS2 - 61
HS2 -511
5
30
5
5
5
370
10
50
5
Term nal
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM 0
HS2 -1 1/211 5
25
FAN
HERM
HS2 -651 10
60
FAN
HERM
3 - Start Capac tor C7
All HS2 - 61, 511, 651 units use a start capacitor (C7) wired
in parallel with the compressor side of the dual capacitor. The
capacitor is located inside the unit control box (see figure 1).
C7 is switched off by potential relay (K31) when the compresĆ
sor nears full speed.ĂSee table 2 for startĂcapacitor ratings.
TABLE 2
Un t MFD VAC
HS24 START CAPACITOR RATING
HS2 - 61
HS2 -511
189-227
HS2 -651
330
189-227 330
135-155 320
4 - Transformer T5
Transformer T5 is used on all J" voltage units. T5 is used as
a stepĆdown transformer for fan B . T5 is rated at 3. VA with
a 575 volt primary and a 60 volt secondary.
5 - Potent al (Start) Relay K31
All HS2 - 61, 511, 651 series units use a potential relay
which controls the operation of the starting circuit. The poĆ
tential relay is located inside the unit control box (see figure
1). The relay is normally closed when contactor K2 is deĆenĆ
ergized. When K1 energizes, the compressor immediately
begins startĆup. K31 remains closed during compressor
startĆup and the start capacitor remains in the circuit. As the
compressor gains speed, K31 is energized. When K31 enĆ
ergizes, the contacts open and the start capacitor is taken
out of the circuit.
6 - Fan Capac tor C1
The fan in threeĆphase units use permanent split capacitor
motors. A single capacitor is used for the fan motor. The caĆ
pacitor is located inside the unit control box (see figure 2).
Table 3 shows the ratings of C1.
TABLE 3
Un t MFD VAC
HS24 FAN CAPACITOR RATING (C1)
HS2 - 13/ 63
HS2 -513/653Y,G
HS2 -651J
10 370
10 370
5 370
B - Compressor
Table shows the specifications of compressors used in
HS2 series units.
TABLE 4
Un t Phase LRA RLA O l
fl.oz.
HS2 -211
HS2 -311
HS2 -511
1
1
1
9
71.0
110
32*
5 *
5*
**Shipped with 60% Zerol 300Ċ 0% Sontex 200LT. A 60/ 0 mixture of
Zerol 300/Sontex 200LT may be used if additional oil is required.
9.6
11.7
20.5
HS2 -1 1 1 26.3 .8
HS2 - 13 3 32.8 5 *.6
HS2 -651 1 1 7 2 65*
15**
HS2 -653
HS2 -653
3
3
150
73
65*
65*
16
8.0
HS2 - 63 3 130 70*11.9
60
HS2 - 13 3 65.1 5 *9.2
208/230
HS2 -653 3 50.0 6. 65*
HS2 - 61 1 105 70*16.
HS2 - 11 1 86.7 5 *1 .2
HS2 -261 1 56 5*10.9
HS2 - 63 3 6 70*5.6
HS2 -513 3 92.0 5 *13.
HS2 -513 3 6.0 5 *6.7
HS2 -513
Voltage
208/230
208/230
208/230
208/230
208/230
208/230
208/230
208/230
208/230
208/230
208/230
60
60
60
575
575
HS24 COMPRESSOR SPECIFICATIONS
3 .0 5 *5.3
*Shipped with conventional white oil (Sontex 200LT) or 3GS. 3GS oil may
be used if additional oil is required.

FIGURE 3
HS24-141
ROTARY COMPRESĆ
SOR
COMPRESSOR IS MANUFACTURED BY
TECUMSEH PRODUCTS
Page
1 - Rotary Compressor (-141 Un ts Only)
HS2 Ć1 1 units utilize a
hermetically sealed
rotaryĆtype compressor.
The compressor is
manufactured by TeĆ
cumseh Products. It is ilĆ
lustrated in figure 3.
A rotary compressor utiĆ
lizes four moving parts: a
rotor shaft, eccentric,
roller and a blade. See
figure .
The compressor rotor
shaft is attached directly
to the compressor motor.
The rotor shaft is permaĆ
nently attached to an ecĆ
centric. The eccentric roĆ
tates inside the roller. As
the eccentric rotates, the
roller rotates. A springĆ
loaded blade is forced
against the roller providing a separation between intake
and exhaust ports at all times. The blade edge is slightly
rounded and uses a thin layer of refrigerant oil to form a
leak free seal.
ROLLER
FIGURE 4
BLADE
ECCENTRIC
ROTARY COMPRESSOR INTERĆ
NALS
ROTOR
SHAFT
Figure 5 illustrates the four steps in a rotary compressor cycle.
The springĆloaded blade is compressed fully at the beginning
of an exhaust cycle. At this instant the compression is beginĆ
ning (1). The roller rotates and compression continues (2).
When the blade is fully extended the suction port is separated
from the discharge port (3). Intake continues and the comĆ
pressed vapor is discharged ( ). A rotary compressor has a
continuous intake cycle.
ROTARY COMPRESSOR OPERATION
COMPLETION
OF INTAKE
12
34
COMPRESSION
CONTINUES
COMPRESSION
CONTINUES
COMPRESSED
VAPOR
DISCHARGED
BEGINNING OF
COMPRESSION
INTAKE
CONTINUES
FIGURE 5
INTAKE
CONTINUES
INTAKE
CONTINUES
a - Suct on Muffler (Ć141 Un ts Only)
All HS2 Ć1 1 units are equipped with a suction
muffler that is externally mounted on the comĆ
pressor shell and attaches to the suction line.
The muffler contains two wire mesh screen filters
for added compressor protection. See figure 6.
2 - Accumulator (Ć141 Un ts Only)
All HS2 -1 1 units are equipped with an accumulator that
is mounted in the suction line. The accumulator protects
the compressor from liquid slugging. See figure 6.
FIGURE
6
SUCTION MUFFLER
ACCUMULATOR
HS24Ć141 REFRIGERANT PLUMBING
COMPRESSOR
CONDENSING
COIL SUCTION
LINE
3 - Rec procat ngĂCompressorĂ(all other un ts)
All units except for the -1 1 units utilize a conventional reĆ
ciprocating style compressor.

FIGURE
7
COMPRESSOR COVER
VELCROt
STRAPS
SLIT FOR DISCHARGE LINE
SLIT FOR
SUCTION
LINE
COVER
COMPRESSOR
Page 5
4 - Crankcase Heater
A crankcase heater is used on all HS2 -510 through
HS2 -650 models. The wellĆmounted insertionĆtype heater
is selfĆregulating. Heaters are rated at 27 watts for
HS2 Ć511/513 and 30 watts for HS2 Ć651/653. The heater
is temperatureĆactuated and operates only when required.
5 - Compressor Cover (F gure 7)
A compressor cover
constructed out of vinylĆ
faced fiberglass is used
on all HS2 - 11 through
-651 units. The cover proĆ
vides an acoustic barrier.
The cover slides over the
compressor and is held
secure with velcrot
straps. Slits are provided
for installation around the
discharge and suction
lines.
C - Condenser Fan Motor
All units use single-phase PSC fan motors which require a
run capacitor. The table on page 1 of this manual shows the
specifications of condenser fans used in HS2 s. In all
units, the condenser fan is controlled by the compressor
contactor.
Two different mounting arrangements are used (fan up and
fan motor up) see figures 8 and 9.
CONDENSER FAN MOTOR AND COMPRESSOR
ACCESS (FAN UP" UNITS)
FAN
REMOVE (6) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD
TO ACCESS FAN.
Remove (6)
screws
Screws
MOTOR SPIĆ
DER
LIFT FAN GUARD OFF AFTER REMOVING (6)
SCREWS
Usage:
4 tons and up
FIGURE 8
Access to the condenser fan motor on all units is gained by
removing the six (6) screws securing the fan guard. See
figures 8 and 9.
The condenser fan motor is attached to the fan guard on
motor up" units and is removed with the fan guard. See
figure 9.
FIGURE 9
FAN
Usage:
3.5 tons and under
CONDENSER FAN MOTOR AND COMPRESSOR
ACCESS (MOTOR UP" UNITS)
Remove (6)
screws
Screws
REMOVE (6) SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD/FAN
ASSEMBLY.
MOTOR
FAN GUARD
WIRING
RACEWAY
III - REFRIGERANT SYSTEM
A - Plumb ng
Field refrigerant piping consists of liquid and suction lines
from the outdoor unit (sweat connections). Use Lennox
L10 series line sets as shown in table 5 or field fabricated
refrigerant lines.
Separate discharge and suction service ports are provided
outside the unit for connection of gauge manifold during
charging procedure.
L ne
Set
Model No.
TABLE 5
HS2 -1 1
Length of
Suct. & L q.
L nes (ft.)
L qu d
L ne
(o.d. ft.)
Suct on
L ne
(o.d. ft.)
*Not Available **1/ 1/2
L10-21-20
L10-21-25
L10-21-35
L10-21-50
20
25
35
50
***5/16 5/8
5/8
{5/8
{5/8
***5/16
***5/16
***5/16
HS2 -211
HS2 -261
L10- 1-20
L10- 1-30
L10- 1- 0
L10- 1-50
20
30
0
50
3/8 3/
3/
3/
3/
3/8
3/8
3/8
HS2 -311
HS2 - 10
L10-65-30
L10-65- 0
L10-65-50
30
0
50
3/8 7/8
7/8
7/8
3/8
3/8
HS2 - 60
HS2 -510
HS2 -651 *Not Available 3/8 1-1/8
*Field Fabricate
LINE SET SPECIFICATIONS
Condens ng
Un t
Model No.
*** 3/8" x 5/16" reducer furnished to adapt unit to 5/16" line set.
**3/8" x 1/ " reducer furnished to adapt unit to 1/ field
fabricated line set.

Page 6
B - Serv ce Valves
The liquid line and suction line service valves and gauge
ports are accessible from outside of the unit. Full service
liquid and suction line valves are used. See figures 10 and
11. The service ports are used for leak testing, evacuating,
charging and checking charge.
1 - L qu d L ne Serv ce Valve
A full service liquid line valve is used on all HS2 series
units. Different manufacturers of valves may be used. All
liquid line service valves function the same way, differĆ
ences are in construction. Valves manufactured by Parker
are forged assemblies. Valves manufactured by Primore
are brazed together. Valves are not rebuildable. Defective
valves must be replaced. The liquid line service valve is ilĆ
lustrated in figure 10.
LIQUID LINE SERVICE VALVE
FIGURE 10
STEM CAP
STEM CAP
STEM
CAP
VALVE BACK
SEATED
VALVE
FRONT
SEATED
SERVICE PORT
NOTE: WHEN VALVE IS BACKSEATED SERVICE PORT
IS ISOLATED (BLOCKED OFF) FROM SYSTEM
NOTE: WHEN VALVE IS FRONT SEATED
SERVICE PORT IS NOT ISOLATED
(BLOCKED OFF) FROM SYSTEM
IMPORTANT
A schrader valve s not prov ded on the l qu d l ne
serv ce port. Valve must be backseated to turn off
pressure to serv ce port.
NO SCHRADER
The valve is equipped with a service port. There is no
schrader valve installed in the liquid line service port. A serĆ
vice port cap is supplied to seal off the port.
The liquid line service valve is a front and back seating
valve. When the valve is backseated the service port is isoĆ
lated from the system.
CAUTION
The serv ce port cap s used to seal the l qu d l ne
serv ce valve. Access to serv ce port requ res backĆ
seat ng the serv ce valve to solate the serv ce port
from the system. Fa lure to do so w ll cause refr gerĆ
ant leakage.
IMPORTANT
A schrader valve s not prov ded on the l qu d l ne
serv ce port. Valve must be backseated to turn off
pressure to serv ce port.
To Access Serv ce Port:
1 - Remove the stem cap with an adjustable wrench.
2 - Remove service port cap with an adjustable wrench.
3 - Connect high pressure gauge to liquid line service port.
- Open valve stem (1/2 turn clockwise) from backseated
position.
5 - When finished using port, backseat stem, tighten firmly,
remove gauge; install service port cap, tighten firmly.
Replace stem cap, tighten firmly. See table 6 for serĆ
vice port cap and stem cap torque specifications.
To Close Off Serv ce Port:
1 - Backseat valve with service wrench.
a - Turn stem counterclockwise.
b - Tighten firmly.
To Open L qu d L ne Serv ce Valve:
1 - Remove the stem cap with an adjustable wrench.
2 - Backseat valve with service wrench.
a - Turn stem counterclockwise until backseated.
b - Tighten firmly.
3 - Replace stem cap, tighten firmly. See table 6 for stem
cap torque specifications.
To Close L qu d L ne Serv ce Valve:
1 - Remove the stem cap with an adjustable wrench.
2 - Turn the stem in clockwise to seat the valve. See table 6
for valve seating torque specifications.
3 - Replace stem cap. See table 6 for stem cap torque
specifications.

Page 7
TABLE 6
3/8" LIQUID LINE SERVICE VALVE TORQUE SPECS*
Manufacturer Serv ce Port
Cap Torque
Stem Cap
Torque
Seat ng Torque
Front Seat
PARKER
(Forged Body)
PRIMORE
(Brazed Body) 9Ć12 lbs./ft. 3Ć5 lbs./ft. 20Ć24 lbs./ft.
18Ć22 lbs./ft.8Ć10 lbs./ft.7Ć11 lbs./ft.
*T ghten each component f rmly; f leaks are ev dent, t ghten to
appropr ate torque.
2 - Suct on L ne Serv ce Valve
A full service suction line service valve is used on all HS2 seĆ
ries units. Suction valves are nonĆbackseating type. Three difĆ
ferent manufacturers of valves may be used. All suction line
service valves function the same way, differences are in
construction. Valves manufactured by Aeroquip and Parker
are forged assemblies. Valves manufactured by Primore are
brazed together. Valves are not rebuildable. Defective valves
must be replaced. The suction line service valve is illustrated
in figures 11 and 12.
SUCTION LINE SERVICE VALVE (VALVE OPEN)
FIGURE 11
SCHRADER VALVE
SERVICE PORT
SERVICE
PORT
CAP
STEM CAP
INSERT HEX WRENCH
HERE
SNAP RING
SUCTION LINE SERVICE VALVE (VALVE CLOSED)
FIGURE 12
STEM
CAP
SCHRADER VALVE
SERVICE PORT
SERVICE PORT CAP (VALVEĆ
FRONT SEATED)
NOTE: WHEN VALVE IS FRONT SEATED THE SCHRADER
PORT IS NOT ISOLATED FROM THE SYSTEM.
SNAP RING
The 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.
The suction line service valve is a front-seating valve and
does not backseat.
WARNING
Suct on valves are nonĆbackseat ng. Do not atĆ
tempt to backseat th s valve. Attempts to backseat
th s valve w ll cause snap r ng to explode from
valve body under pressure of refr gerant. PersonĆ
al njury and un t damage w ll result.
To Access Schrader Port:
1 - Remove service port cap with an adjustable wrench.
2 - Install in reverse order. Tighten firmly. See table 7 for
service port cap torque values.
To Open Suct on L ne Serv ce Valve:
1 - Remove stem cap with an adjustable wrench.
2 - Insert a 5/16" hex wrench into the stem.
3 - Back the stem out counterclockwise until the valve
stem just touches the retaining ring.
- Replace stem cap, tighten firmly. See table 7 for stem
cap torque specifications.
TABLE 7
SUCTION LINE SERVICE VALVE TORQUE SPECS*
S ze Stem Cap
Torque
1/2"
6Ć10 lbs./ft.
Manufacturer Seat ng Torque
Front Seat
Serv ce Port
Cap
Parker**
Aeroquip
5/8" Parker**
3/ " Primore
Aeroquip
7/8" Parker**
1 1/8" Primore
Aeroquip
Primore 18Ć20 lbs./ft.
18Ć20 lbs./ft.
18Ć20 lbs./ft.
18Ć22 lbs./ft.
22Ć25 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
6Ć10 lbs./ft.
12Ć16 lbs./ft.
12Ć15 lbs./ft.
15Ć20 lbs./ft.
12Ć15 lbs./ft.
12Ć16 lbs./ft.
15Ć20 lbs./ft.
15Ć20 lbs./ft.
15Ć21 lbs./ft.
**Parker valves have a forged body, Pr more and Aeroqu p valves have a
brazed body.
*T ghten each component f rmly; f leaks are ev dent, t ghten to
appropr ate torque.
18Ć2 lbs./ft.
18Ć2 lbs./ft.
18Ć2 lbs./ft.
To Close Suct on L ne Serv ce Valve:
1 - Remove stem cap with an adjustable wrench.
2 - Insert a 5/16" hex wrench into the stem.
3 - Turn stem in clockwise to seat the valve. Tighten firmly.
See table 7 for valve seating torque specifications.
- Replace stem cap, tighten firmly. See table 7 for stem
cap torque specifications.

Page 8
IV - CHARGING
The unit is factory-charged with the amount of R-22 refrigĆ
erant indicated on the unit rating plate. This charge is
based on a matching indoor coil and outdoor coil with a 25
foot (7620mm) line set. For varying lengths of line set, refer
to table 8 for refrigerant charge adjustment. A blank space
is provided on the unit rating plate to list actual field charge.
LIQUID LINE
1/ in. (6 mm)
5/16 in. (8mm)
3/8 in. (10 mm)
TABLE 8
Ounce per 5 foot (ml per mm) adjust
from 25 foot (7620 mm) l ne set*
1 ounce per 5 feet
(30 ml per 152 mm)
*If l ne set s greater than 25 ft. (7.62m) add th s amount. If l ne set
s less than 25 feet (7.62m) subtract th s amount
SET DIAMETER
2 ounce per 5 feet
(60 ml per 152 mm)
3 ounce per 5 feet
(90 ml per 152 mm)
Units are designed for line sets up to 50ft. Consult Lennox ReĆ
frigerant Piping Manual for line sets over 50ft.
IMPORTANT
If l ne length s greater than 25 feet (7620 mm), add
th s amount. If l ne length s less than 25 feet (7620
mm), subtract th s amount.
A - Leak Test ng
1- Attach gauge manifold and connect a drum of dry nitroĆ
gen to center port of gauge manifold.
CAUTION
When us ng dry n trogen, a pressure reduc ng regĆ
ulator must be used to prevent excess ve presĆ
sure n gauge man fold, connect ng hoses, and
w th n the system. Regulator sett ng must not exĆ
ceed 150 ps g (1034 kpa). Fa lure to use a regulator
can cause equ pment fa lure result ng n njury.
2- Open high pressure valve on gauge manifold
and pressurize line set and indoor coil to 150 psig
(103 kPa).
3- Check lines and connections for leaks.
NOTEĆIf electronic leak detector is used, add a trace of reĆ
frigerant to the nitrogen for detection by leak detector.
- Release nitrogen pressure from the system, correct
any leaks and recheck.
B - Evacuat ng the System
1- Attach gauge manifold. Connect vacuum pump (with
vacuum 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 n the vacuum range.
IMPORTANT
The compressor should never be used to evacuĆ
ate a refr gerat on or a r cond t on ng 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 testing 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 manĆ
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 nitrogen
pressure by opening manifold high pressure valve.
Close manifold high pressure valve to center port.
- Close nitrogen drum valve and disconnect from gauge
manifold center port. Release nitrogen pressure 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 29.7 inches
(75 mm) mercury (5mm absolute pressure) 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.
C - Charg ng
If the system is completely void of refrigerant, the recomĆ
mended and most accurate method of charging is to weigh
the refrigerant into the unit according to the total amount
shown on the unit nameplate and in table 9.

Page 9
Un t
HS2 -211
HS2 -311
HS2 -511/513
HS2 -1 1
HS2 - 13
HS2 -651/653
HS2 - 13
HS2 - 61/ 63
HS2 - 11
HS2 -261
HS24 REFRIGERANT CHARGE
TABLE 9
Refr gerant Charge R-22
lbs. 5 oz.
5 lbs. 7 oz.
5 lbs. 12 oz.
5 lbs. 15 oz.
5 lbs. 15 oz.
6 lbs. 2 oz.
9 lbs. 6 oz.
9 lbs. 0 oz.
11 lbs. 5 oz.
lbs. 10 oz.
If weighing facilities are not available or if unit is just low
on charge, the following procedure applies.
1 - Expans on Valve Systems
The following procedures are intended as a general guide
for use with expansion valve systems only. For best reĆ
sults, indoor temperature should be between
70 °F and 80 °F. Outdoor temperature should be 60 °F or
above. Slight variations in charging temperature and presĆ
sure should be expected. Large variations may indicate a
need for further servicing.
IMPORTANT
The follow ng procedure requ res accurate readĆ
ngs of amb ent (outdoor) temperature, l qu d temĆ
perature and l qu d pressure for proper charg ng.
Use a thermometer w th accuracy of +2 °F and a
pressure gauge w th accuracy of +5 PSIG.
1 - Connect gauge manifold. Connect an upright
R-22 drum to center port of gauge manifold.
2 - Record outdoor ambient temperature.
3 - Operate indoor and outdoor units. Allow outdoor unit
to run until system pressures stabilize.
- Make sure thermometer well is filled with mineral oil
before checking liquid line temperature.
5 - Place thermometer in well and read liquid line temĆ
perature. Difference between ambient and liquid
line temperatures should match values given in
table 10 (approach temperature = liquid line temĆ
perature minus ambient temperature). Refrigerant
must be added to lower approach temperature.
Remove refrigerant from system to increase apĆ
proach temperature.
TABLE 10
Model L qu d Temp M nus Amb ent
Temp. (°F)
HS2 -261
HS2 -311
HS2 - 11/ 13
HS2 - 61/ 63
APPROACH METHOD - EXPANSION VALVE SYSTEMS
+1
8+1
10+1
16+1
HS2 -211 5+1
HS2 -1 1 1+1
HS2 -511/513 7+1
HS2 -651/653 10+1
6 - When unit is properly charged liquid line
pressures should approximate those given in
table 11.
IMPORTANT
Use table 11 as a general gu de for perform ng
ma ntenance checks. Table 11 s not a procedure
for charg ng the system. M nor var at ons n these
pressures may be expected due to d fferences n
nstallat ons. S gn f cant dev at ons could mean
that the system s not properly charged or that a
problem ex sts w th some component n the sysĆ
tem. Used prudently, table 11 could serve as a useĆ
ful serv ce gu de.
TABLE 11
NORMAL OPERATING PRESSURES
OUTDOOR
COIL
ENTERING AIR
TEMPERATURE
HS24-141 HS24-261 HS24-311 HS24-411/413
65° F (TXV)
75°F (TXV)
85°F (TXV)
95°F (TXV)
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
105°F (TXV)
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
HS24-211 HS24-461/463 HS24-511/513 HS24-651/653
LIQ.
+ 10
SUC.
+ 10
PSIG PSIG
LIQ.
+ 10
PSIG
SUC.
+ 10
PSIG
SUC.
+ 10
PSIG
LIQ.
+ 10
PSIG
126
1 9
178
208
236
58
70
77
79
8
133
157
18
21
250
60
68
75
77
80
1 0
16
190
221
25
63
70
76
78
81
151
178
207
238
276
61
67
73
75
78
16
191
218
251
292
60
66
72
7
77
163
188
220
255
29
58
67
73
78
81
1 6
167
200
231
261
63
69
7
76
80
1 7
17
201
233
278
59
66
71
73
76
105°F (RFCII)
95°F (RFCII)
85°F (RFCII)
75°F (RFCII)
65° F (RFCII) 126
1 9
178
208
236
52
6
71
78
83
137
161
188
216
252
56
6
71
77
80
1 2
168
19
220
253
59
66
72
78
81
15
181
210
238
276
58
6
70
75
78
158
185
218
250
283
58
6
70
75
77
166
191
223
255
29
56
65
71
77
80
1 6
167
200
231
261
60
66
71
75
79
152
179
206
233
278
55
62
67
72
75

Page 10
2 - RFCII Systems
The following procedures are intended as a general guide
for use with RFCII systems only. For best results, indoor
temperature should be between 70 °F and 80 °F. Outdoor
temperature should be 60 °F or above. Slight variations in
charging temperature and pressure should be expected.
Large variations may indicate a need for further servicing.
IMPORTANT
The follow ng procedure requ res accurate readĆ
ngs of amb ent (outdoor) temperature, l qu d temĆ
perature and l qu d pressure for proper charg ng.
Use a thermometer w th accuracy of +2 °F and a
pressure gauge w th accuracy of +5 PSIG.
1 - Connect gauge manifold. Connect an upright R-22
drum to center port of gauge manifold.
2 - Operate indoor and outdoor units. Allow outdoor unit
to run until system pressures stabilize.
3 - Make sure thermometer well is filled with mineral oil
before checking liquid line temperature.
- Place thermometer in well and read liquid line temĆ
perature.
5 - Read liquid line pressure.
6 - Convert liquid line pressure to condensing temperĆ
ature.
7 - Subtract liquid line temperature from condensing
temperature to determine subcooling. Compare
with table12.
8 - Add refrigerant to increase subcooling. Remove
refrigerant to decrease subcooling.
9 - When unit is properly charged liquid line
pressures should approximate those given in
table 11.
TABLE 12
Outdoor
Temp. (_F)
L qu d Subcool ng (+ 1
°F)
SUBCOOLING METHOD
Ć141 Ć211 Ć261 Ć311 Ć410 Ć460 Ć510 Ć650
60
65
70
75
80
85
90
95
100
105
110
115
9
8
7
7
6
6
5
4
4
3
3
2
11
11
10
10
9
9
8
8
7
6
6
5
14
14
13
13
12
12
11
11
10
10
9
8
18
17
17
16
16
15
15
14
13
12
11
9
15
14
13
12
11
10
9
8
6
5
4
2
15
15
14
14
13
13
12
12
11
10
10
9
20
19
19
18
18
17
17
16
15
15
14
13
17
16
16
15
15
14
14
13
13
12
11
10
D - O l Charge
Table on page 3 shows the factory oil charge in HS2 units.
V - Ma ntenance
At the beginning of each heating or cooling season, the
system should be cleaned as follows:
A - Outdoor Un t
1 - Clean and inspect condenser coil. (Coil may be
flushed with a water hose).
2 - Condenser fan motor is prelubricated and ports are
sealed with plugs. No further lubrication is required.
Oiling ports can be accessed for lubrication after exĆ
tended operation by removing plugs. Be sure to seĆ
curely seal after servicing.
3 - Visually inspect all connecting lines, joints and coils
for evidence of oil leaks.
IMPORTANT
If nsuff c ent heat ng or cool ng occurs, the un t
should be gauged and refr gerant charge
checked.
B - Indoor Co l
1 - Clean coil if necessary.
2 - Check connecting lines, joints and coil for evidence
of oil leaks.
3 - Check condensate line and clean if necessary.
C - Indoor Un t
1 - Clean or change filters.
2 - Use the following as a guide when lubricating
the blower motor:
a- Motors without Oiling Ports -- Prelubricated
and sealed. No further lubrication required.
b- irect rive Motors with Oiling Ports -- PreluĆ
bricated for an extended period of operation.
For extended bearing life, relubricate with a
few drops of SAE 10 non-detergent oil once
every two years. It may be necessary to reĆ
move blower assembly for access to oiling
ports.
3 - Adjust blower speed for cooling. The static presĆ
sure drop over the coil should be checked to deterĆ
mine the correct blower CFM. Refer to Lennox EnĆ
gineering Handbook for Static Pressure and CFM
tables.
- Check all wiring for loose connections.
5 - Check for correct voltage at unit.
6 - Check amp-draw on blower motor.
Unit nameplate_________Actual_________.

Page 11
OPERATING SEQUENCE
A-HS24 (P Voltage) Operat on Sequence
This is the sequence of operation for HS2 P voltage
units. The sequence is outlined by numbered steps
which correspond to circled numbers on the adjacent
diagram.
NOTE-The thermostat used may be electromechaniĆ
cal or electronic.
Cool ngĆNo Start Components:
1- Cooling demand initiates at Y1 in the thermostat.
2- Compressor contactor K1 is energized
3- K1-1 N.O. closes energizing terminal C" of compresĆ
sor (B1) and condenser fan motor (B ).
- Compressor (B1) and condenser fan motor (B ) begin
immediate operation.
End of Cool ng Demand:
5- Cooling demand is satisfied.
6- Contactor K1 is deĆenergized.
7- K1-1 opens. and compressor (B1) and condenser fan
motor (B ) are deĆenergized and stop immediately.
Cool ngĆW th Start Components:
8- Cooling demand initiates at Y1 in the thermostat.
9- Compressor contactor K1 is energized
10-K1-1 N.O. closes energizing terminal C" of compresĆ
sor (B1) and condenser fan motor (B ).
11-Terminal R is powered by L2 through the contactor. It is
powered at all times. Terminal S is powered by the
start capacitor and the H side of the dual capacitor.
12-As the compressor nears full speed, the potential
relay is energized (terminals 5Ć2) and potential relay
contacts 1Ć2 open.
XII–WIRING DIAGRAMSAND SEQUENCE OF OPERATION
1
2
3
4
6
7
4
5
77
S1
THERMOSTAT
SINGLE PHASE OPERATING SEQUENCE
8
9
10
11
12

Page 12
2
3
4
6
7
47
OPERATING SEQUENCE
B-HS24 (Y, G and J Voltage) Operat on Sequence
This is the sequence of operation for HS2 Y, G and J
voltage units. The sequence is outlined by numbered
steps which correspond to circled numbers on the adjaĆ
cent diagram.
NOTE-The thermostat used may be electromechaniĆ
cal or electronic.
Cool ng:
1- Cooling demand initiates at Y1 in the thermostat.
2- Compressor contactor K1 is energized
3- K1-1 N.O. closes energizing terminal C" of compressor
(B1) and condenser fan motor (B ).
- Compressor (B1) and condenser fan motor (B )
begin immediate operation.
End of Cool ng Demand:
5- Cooling demand is satisfied.
6- Contactor K1 is deĆenergized.
7- K1-1 opens and compressor (B1) and condenser fan
motor (B ) are deĆenergized and stop immediately.
7
15
S1 THERMOSTAT
THREE PHASE OPERATING SEQUENCE