SERVICE
UNIT
INFORMATION
Corp. 9428–L10
Replaces Corp. 9330-L4
HP23 SERIES UNITS
HP23
Litho U.S.A.
The HP23 is a high-efficiency residential
split-system heat pump. Extra large outdoor coil,
coil circuiting and high outdoor coil air volume
result in a high SEER rating (minimum of 10.0).
HP23-141 through HP23-510 units are designed for
use with an expansion valve or RFCIII system in the
indoor unit. HP23-651/653 units are designed for use
with an expansion valve only in the indoor unit.
All compressors are hermetically sealed for
trouble-free operation and long service life.
Compressor components are spring mounted within
the sealed housing. The compressor is installed in the
unit on resilient rubber mounts to assure quiet,
vibration-free operation. A built-in limit protects the
compressor from excessive current and temperatures.
A high pressure safety limit is furnished as standard.
HP23–211 through HP23–650 models are furnished with
crankcase heaters as standard equipment. The heater
prevents liquid from accumulating in the compressor.
The heater is temperature-actuated and operates only
when required. A crankcase heater for HP23-141 units is
optional, but suction accumulator is factory installed.
Several models are available in sizes ranging from 1
through 5 tons.
This manual is divided into sections which discuss major
components refrigerant system, charging procedures,
maintenance, and operation sequence.
Canadian specifications are marked (CAN).
All specifications in this manual are subject to change.
SPECIFICATIONS
Model No. HP23-141 HP23-211 HP23-261 HP23-311
Outer coil 12.60 12.60 12.60 14.70
Net face area (sq. ft.)
Condenser
Coil
Condenser
Fan
*Refrigerant — 22 charge furnished 5 lbs. 3 oz. 5 lbs. 6 oz. 6 lbs. 2 oz. 7 lbs. 3 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 3/4
*Refrigerant charge sufficient for 20 ft. length of refrigerant lines.
**3/8” x 1/4” reducer furnished to adapt to 1/4 field fabricated line set.
***3 /8” x 5/16” reducer furnished to adapt unit to 5/16” line set.
Tube diameter (in.) & no. of rows 3/8 — 1 3/8 — 1 3/8 — 1 3/8 — 1
Fins per inch 20 20 20 20
Diameter (in.) & no. of blades 20 — 3 20 — 3 20 — 3 20 — 3
Motor hp 1/6 1/6 1/6 1/6
Cfm 2630 2630 2630 2665
Rpm 840 840 840 850
Watts 210 210 210 210
Inner coil - - - - - - - - - - - - - - - -
Page 1
1993 Lennox Industries Inc.
SPECIFICATIONS (contd.)
Net f
)
Cond
Fan
Model No. HP23-411/HP23-413 HP23-461/HP23-463 HP23-511/HP23-513 HP23-651/HP23-653
Condenser
Coil
enser
*Refrigerant — 22 charge furnished 7lbs. 14oz. / 7lbs. 5oz. 8 lbs. 3 oz. 9 lbs. 6 oz. 12 lbs. 13 oz.
Liquid line (o.d. in.) connection (sweat) 3/8 3/8 3/8 3/8
Suction line (o.d. in.) connection (sweat) 3/4 7/8 7/8 1-1/8
*Refrigerant charge sufficient for 20 ft. length of refrigerant lines.
ace area (sq. ft.
Tube diameter (in.) & no. of rows 3/8 — 1.3 3/8 — 1.0 3/8 — 1.3 3/8 — 2.0
Fins per inch 20 20 20 20
Diameter (in.) & no. of blades 20 — 3 20 — 4 24 — 4 24 — 4
Motor hp 1/6 1/4 1/4 1/4
Cfm 2600 3980 3980 3950
Rpm 845 840 830 825
Watts 200 350 340 370
Outer coil 14.70 20 20.00 20.00
Inner coil 3.9 - - - - 6.3 19
ELECTRICAL DATA
Model No. HP23-141 HP23-211 HP23-261 HP23-311-1 HP23-311-2 HP23-411 HP23-411–2
Line voltage data 208/230v 60hz-1ph
Rated load amps 5.0 8.1 10.9 12.2 13.7 16.3 16.2
Compressor Power factor .97 .99 .95 .97 0.99 .99 .91
Locked rotor amps 26.3 49.0 61.0 71.0 75.0 86.7 96.0
Condenser Coil
Fan Motor
Rec. max. fuse or circuit breaker size
(amps)
*Minimum circuit ampacity 7.4 11.3 14.8 16.4 18.2 21.5 21.3
*Refer to National 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.
Full load amps 1.1 1.1 1.1 1.1 1.1 1.1 1.1
Locked rotor amps 1.7 1.7 1.7 1.7 1.7 1.7 1.7
15 15 25 25 30 35 35
ELECTRICAL DATA
Model No. HP23-413 HP23-461-1 HP23-463-1
Line voltage data — 60hz.
Rated load amps 11.6 5.1 18.6 12.7 5.8
Compressor Power factor .88 .88 .94 .82 .82
Locked rotor amps 65.1 32.8 102.0 91.0 42.0
Condenser Coil
Fan Motor
Rec. max. fuse or circuit breaker size (amps) 25 15 40 30 15
*Minimum circuit ampacity 15.6 7.0 25.0 17.6 8.4
*Refer to National 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.
Full load amps 1.1 0.6 1.7 1.7 1.1
Locked rotor amps 1.7 0.9 3.1 3.1 2.2
208/230
3ph
460v
3ph
208/230v 1ph
208/230v
3ph
460v
3ph
ELECTRICAL DATA
Model No. HP23-511 HP23-513 HP23-651 HP23-653
Line voltage data — 60 hz 208/230v 1ph 208/230v 3ph 460v 3ph 208/230v 1ph 208/230v 3ph 460v 3ph
Rated load amps 24.4 16.1 8.4 30.8 17.4 9.7
Compressor Power factor .98 .78 .78 .98 .78 .78
Locked rotor amps 135.0 137.0 68.0 147.0 150.0 73.0
Condenser Coil
Fan Motor
Rec. max. fuse or circuit breaker size (amps) 50 35 15 60 40 20
*Minimum circuit ampacity 32.2 21.9 10 40.2 23.5 13.3
*Refer to National 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.
Full load amps 1.7 1.7 1.1 1.7 1.7 1.1
Locked rotor amps 3.1 3.1 2.2 3.1 3.1 2.2
Page 2
I – UNIT INFORMATION
HP23 units are available in 1, 1 -1/2, 2, 2 -1/2, 3, 3 -1/2, 4
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 Engineering Handbook for approved system
matchups. A misapplied system will cause erratic
operation and can result in early compressor failure.
II – UNIT COMPONENTS
Unit components are illustrated in figures 1 and 2.
HP23-141, -210, -260, -310 and -410
EXPANSION
VALVE
UNIT COMPONENTS
OUTDOOR
FAN/MOTOR
A – Control Box (Figures 3 and 4)
HP23 UNIT CONTROL BOX SINGLE PHASE UNITS
START CAPACITOR
(C7)
DUAL CAPACITOR
DEFROST
RELAY (K4)
COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
(C12)
POTENTIAL
RELAY (K31)
DEFROST
CONTROL
CMC1
TIMED OFF
CONTROL (A4)
HP24-651 ONLY
LOW VOLTAGE
MAKEUP
AREA
CONTROL
BOX
COMPRESSOR
HP23-141 SHOWN
REVERSING VALVE
SUCTION
MUFFLER HP23-141
ONLY
ACCUMULATOR
HP23-141 ONLY
FIGURE 1
HP23-460, -510 and -650 UNIT COMPONENTS
EXPANSION
VALVE
FAN
SPIDER
OUTDOOR
FAN/MOTOR
FIGURE 3
HP23 UNIT CONTROL BOX THREE PHASE UNITS
FAN CAPACITOR
(C1)
DEFROST
RELAY (K4)
COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
TRANSFORMER(T5)
“J” VOLTAGE
UNITS ONLY
DEFROST
CONTROL
CMC1
TIMED OFF
CONTROL (A4)
HP24-653 ONLY
LOW VOLTAGE
MAKEUP
AREA
FIGURE 4
A low voltage make up area is provided for thermostat
field wiring. Field thermostat wiring is made to color
coded pigtail connections as illustrated in figure 5.
CONTROL BOX
REVERSING VALVE
FIGURE 2
COMPRESSOR
ACCUMULATOR
Page 3
THERMOSTAT WIRING IDENTIFICATION
RED
YELLOW
ORANGE
BEIGE
FROM OUTDOOR UNIT
BLACK
24V (POWER) INPUT
TO OUTDOOR UNIT
(COMPRESSOR)
(REVERSING VALVE)
INPUT
(ELECTRIC HEAT)
DEFROST OUTPUT
(COMMON)
FIGURE5
INPUT
THERMOSTAT
TO INDOOR UNIT/
1 – Compressor Contactor K1
The compressor is energized by a contactor located in
the control box. See figures 3 and 4. Contactors are
SPST in single phase units and 3PST in three phase
units. K1 is energized by the indoor thermostat
terminal Y (24V). HP23 units are not equipped with a line
voltage to 24V transformer. All 24 VAC controls are
powered by the indoor unit. Refer to unit wiring diagram.
DANGER
Shock Hazard
All single phase HP23 units use
single-pole contactors. One leg of
compressor, capacitor and outdoor
fan are connected to line voltage at
all times. Potential exists for
electrical shock resulting in injury
or death. Remove all power at
disconnect before servicing.
Can cause personal injury or death.
2 – Dual Capacitor 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 3). 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. See table 1 for dual capacitor ratings.
HP23 (C12) DUAL CAPACITOR RATING
Unit MFD VAC
HP23–141
HP23–211/261
HP23–311-1/411
HP23–311-2
HP23–411-2
HP23–461
HP23–511/651
3 – Potential Relay K31 (Start)
All single phase units use a potential relay which
controls the operation of the starting circuit. The
potential relay is located inside the unit control box (see
figure 3). The relay is normally closed when contactor
K2 is de-energized. When K1 energizes, the compressor
immediately begins start-up. K31 remains closed
during compressor start-up and start capacitor C7
remains in the circuit. As the compressor gains speed,
K31 is energized. When K31 energizes, the contacts
open and start capacitor C7 is taken out of the circuit.
TABLE 1
Terminal
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM
FAN
HERM
25
35
45
35
40
10
40
10
60
5
5
5
5
5
370
440
4 – Start Capacitor C7
All single phase units use a start capacitor (C7). C7 is
located inside the unit control box (see figure 3). C7 is
wired in parallel with the compressor side of the dual
capacitor. See table 2 for start capacitor ratings.
TABLE 2
HP23 START CAPACITOR RATING (C7)
Unit MFD VAC
HP23–141/211/261
HP23–311-1/411 88–108 330
HP23–311-2 145–175 330
HP23–411 (CAN)
HP23–411–2/461/511
HP23–651 270-324 330
88–108 250
25088–108
189-227 330
5 – Timed Off Control A4 (–651 / –653 only)
A time delay (A4) located in the control box is used on
the HP23-650-2 series. See figures 3 and 4. The time
delay is electrically connected between thermostat
terminal Y and the compressor contactor. After cooling
demand has stopped, A4 begins counting for five
minutes. During the timing period, A4 disables the
compressor contactor. Thermostat demand will have
no effect on the unit.The unit cannot operate. After the
delay, the compressor contactor can be energized.
DANGER
Do not attempt to repair this control. Unsafe
operation will result. If the control has failed,
replace the control.
6 – Fan Capacitor C1
The fan in three-phase units uses a single phase
permanent split capacitor motor. A single capacitor C1 is
used for the fan motor. C1 is located inside the unit
control box (see figure 4). Table 3 shows the ratings of C1.
HP23 FAN CAPACITOR RATING (C1)
Unit MFD VAC
HP23–413Y,G
HP23–463/513/653G
HP23-513,653J
HP23-463/513/653Y 10 370
7 – Transformer T5
Transformer T5 is used on all “J” voltage units. T5 is
used as a step-down transformer for fan B4. T5 is rated at
3.4 VA with a 575 volt primary and a 460 volt secondary.
8 – Defrost Relay K4
The defrost relay controls defrost. The relay is a 3PDT
relay powered 24 VAC from the thermostat. K4 is
enabled during both cooling and heating modes
(except emergency heat). It is only powered when the
defrost control is calling for defrost. When energized,
the reversing valve and indoor auxiliary heat are
energized. Simultaneously, the outdoor fan is
de-energized. K4 latches in for the duration of the
defrost period. Refer to unit wiring diagram and
operation sequence in the back of this manual.
TABLE 3
5 370
7.5 370
Page 4
9 – Defrost Control CMC1
The CMC1 defrost control (figure 6) is a solid state control
manufactured by Hamilton Standard. The control
provides automatic switching from normal heating
operation to defrost mode and back. The control
provides 14 minute defrost periods at 30, 60 or 90 minute
field changeable intervals. The control monitors
thermostat demand and “holds” the timer in place
between thermostat demand. A set of diagnostic pins are
also provided for troubleshooting the unit.
The control contains a solid state timer which switches
an external defrost relay through 1/4” male spades
mounted on the control’s circuit board. When the
defrost thermostat closes (call for defrost), the defrost
timer initiates a 30, 60 or 90 minute (depending on how
the control is preset) timing sequence. If the defrost
thermostat remains closed when the timing sequence
ends, the defrost relay is energized and defrost begins.
HP23 SERIES UNITS TYPICAL DEFROST TIMINGS
Note – Control begins timing at 0 when defrost thermostat closes. Defrost is terminated when defrost
CLOSED, ON
OPEN, OFF
THERMOSTAT DEMAND
DEFROST THERMOSTAT
THERMOSTAT DEMAND
DEFROST THERMOSTAT
relay is de–energized. Anytime defrost thermostat opens, defrost relay is immediately de–energized,
NORMAL HEATING OPERATION: DEFROST TERMINATED BY DEFROST THERMOSTAT
DEFROST RELAY
NORMAL HEATING OPERATION: DEFROST TERMINATED BY TIME
DEFROST RELAY
defrost timer resets and “HOLD” function stops.
30/60/90 MINUTES
SOLID STATE DEFROST CONTROL CMC1
Timing Pins
Timing
Jumper
Troubleshooting Pins
30 60 90
Control Terminals
FIGURE 6
A defrost period can last up to 14 minutes and can be
terminated two ways. If the defrost thermostat does
not open within 14 minutes after defrost begins, the
timer will de–energize the defrost relay and the unit
will resume normal operation. If the defrost
thermostat opens during the 14 minute defrost period,
the defrost relay is de–energized and the unit resumes
normal operation. Refer to figure 7.
DEFROST THERMOSTATOPEN WITHIN 14 MINUTES
NORMAL HEATING OPERATION INTERRUPTED BY THERMOSTAT DEMAND: “HOLD” FUNCTION
THERMOSTAT DEMAND
DEFROST THERMOSTAT
DEFROST RELAY
DEFROST PERIOD INTERRUPTED BY THERMOSTAT DEMAND: “HOLD” FUNCTION
THERMOSTAT DEMAND
DEFROST THERMOSTAT
DEFROST RELAY
30/60/90 MINUTES 14 MIN. 30/60/90 MINUTES
DEFROST THERMOSTAT
MUST REMAIN CLOSED
FOR TIMER TO REMAIN
IN “HOLD”
“HOLD” TIME
30/60/90 MINUTES PLUS “HOLD” TIME
DEFROST THERMOSTAT
MUST REMAIN CLOSED
FOR TIMER TO REMAIN
IN “HOLD”
“HOLD” TIME
30/60/90 MINUTES
14 MIN. PLUS “HOLD” TIME
FIGURE 7
Page 5
Defrost Control Components
1– Timing Pins 30, 60, 90
Each of these pins provides a different timed
interval between defrosts. A jumper connects the
pins to circuit board pin W1. Table 4 shows the
timings of each pin. The defrost interval can be field
changed to 30, 60 or 90 minutes. The defrost period
(14 minutes) cannot be changed. To change the
interval between defrosts, simply remove the
jumper from the pin it is connected to and
reconnect the jumper to one of the other available
pins (see figure 8).
TABLE 4
CMC1 DEFROST
CONTROL
TIMINGS
NORMAL
OPERATION
“TST” PINS
JUMPER
TOGETHER
INTERVAL BETWEEN DEFROSTS
WITH JUMPER CONNECTED TO:
30 60 90
30 + 3 60 + 6 90 + 9 14 + 1.4
MIN. MIN. MIN. MIN.
7 + 0.7 14 + 1.4 21 + 2.1 3.3 + 0.3
SEC. SEC. SEC. SEC.
DEFROST
TIME
4– “HLD” Terminal
Terminal “HLD” holds the internal timer in place
between thermostat demands and allows the unit
to continue timing upon resumption of thermostat
demand. Terminal “HLD” is connected directly to
thermostat demand.
NOTE – Hold function operates between thermostat
demands only when defrost thermostat is closed. This
is the only time that the timer is operating.
5– “TST” Pins
Each board is equipped with a set of test pins for
use in troubleshooting the unit. When jumpered
together, these pins reduce the control timing to
about 1/256 original time (see table 4 and figure 9).
IMPORTANT
Control will begin test mode only if normal load is
applied to control terminals. Do not attempt to
operate or test control out of unit.
DEFROST CONTROL TIMING CHANGES
WARNING – AVOID CONTACT WITH OTHER CONTROL TERMINALS OR CONTROL COMPONENTS.
WARNING – DO NOT
CONNECT TIMING
JUMPER TO EITHER
“TST” PIN.
TO CHANGE CONTROL TIMINGS:
1– Turn off all power to the unit to avoid circuit board damage.
2– Grasp wire connector firmly with fingers.
3–
Gently
4– Select new timing pin. DO NOT SELECT A “TST” PIN.
5– Gently push connector onto desired pin (see Table 4 for timings).
6– Turn on power to unit.
pull connector from pin.
FIGURE 8
2– Timing Jumper
The timing jumper is a factory installed jumper
on the circuit board used to connect pin W1 to
one of the three timing pins. The jumper may be
connected to any one of the timing pins but must
never be connected to either of the “TST” pins.
See Caution below.
CAUTION
3– “COM” Terminal
Terminal “COM” provides 24VAC Common.
DEFROST CONTROL TEST MODE
WARNING – AVOID CONTACT WITH
OTHER CONTROL TERMINALS OR
CONTROL COMPONENTS.
TO PLACE CONTROL
1– Turn off all power to avoid
2– Make sure all control terminals are
3– Connect jumper to “TST” pins as shown.
4– Turn indoor thermostat to heat mode and adjust to highest
5– Turn on power to unit.
6– See Table 4 for control timings in “TST” mode.
7– Be sure to turn off power and remove jumper when test is com-
IN TEST MODE:
damaging the circuit board.
connected as shown on unit wiring
diagram before attempting to place control in
test mode. See NOTE below.
NOTE – Control will not go into test mode when disconnected
from unit. Unit load must be applied to control terminals before
the control will go into test mode.
temperature setting.
plete. Turn on power and re–adjust thermostat.
FIGURE 9
6– “24V” Terminal
Terminal “24V” receives 24VAC from the control
transformer through the defrost thermostat. This
terminal powers the control’s internal timer and
relays. Terminal “24V” is powered only when there is
a call for defrost (defrost thermostat closed). The
timer begins timing at 0 only after terminal “24V”
receives power.
7– “OUT” Terminal
Terminal “OUT” controls defrost when connected
to one side of the defrost relay coil. An internal
relay connected to terminal “OUT” closes to allow
external defrost relay to energize and initiate
defrost. At the end of the defrost period, the
internal relay connected to terminal “OUT” opens
to de-energize the external defrost relay.
Page 6
B – Compressor
All units except for the -141 units utilize a conventional
reciprocating compressor. Table 5 shows the
specifications of compressors used in HP23 series units.
TABLE 5
HP23 COMPRESSOR SPECIFICATIONS
Unit Phase LRA RLA Oil fl.oz.
HP23–141 1 26.3 4.8
HP23–211
HP23–261 1 61 32*9.2
HP23–311-1
HP23–311-2 1 75.0 45*13.7
HP23–411 1 86.7 54*14.2208/230
HP23–411–2 1 96 55*16.2
HP23–413 3 65.1 54*9.2
HP23–413 3 32.8 54*4.6
HP23–411 (CAN) 1 40*
HP23–413 (CAN)
HP23–413 (CAN) 3
HP23–461 1 102 55*20.4
HP23–463 3 91 55*14.0
HP23–463 3 42 55*6.4
HP23–511
HP23–513 3 137.0 65*13.0
HP23–513
HP23–513
HP23–651 1 147 24.0 65*
HP23–653
HP23–653
HP23–653 3 62.0 6.4 65*
*Shipped with conventional white oil (Sontex 200LT) or 3GS. 3GS oil may
be used if additional oil is required.
**Shipped with 60% Zerol 300—40% Sontex 200LT. Zerol 300 may be used
if additional oil is required.
Voltage
208/230
208/230
208/230
208/230
208/230
208/230
208/230
460
208/230
208/230
460
208/230
208/230
460
208/230
208/230
460
575
208/230
208/230
460
575
1
1
3
1
3
3 58.0 65*5.2
3
3
49
71.0
11.7
94 14.5
78 9.4
40 4.8
135
19.0
69.0 65*6.5
150
16.0
73
8.0
15**
32*6.8
32*
40*
40*
65*
65*
65*
1 – Rotary Compressor (-141 Units Only)
HP23-141 units utilize a hermetically sealed
rotary-type compressor manufactured by Tecumseh
Products. It is illustrated in figure 10.
The compressor has
four moving parts: a
rotor shaft, eccentric,
ROTARY COMPRESSOR
roller and a blade. See
figure 11.
The compressor rotor
shaft is attached directly
to the compressor motor.
The rotor shaft is
permanently attached to
an eccentric. The
eccentric is inside the
roller and as the eccentric
rotates, the roller rotates.
The spring loaded blade
is in continuous contact
with the roller. The
COMPRESSOR IS MANUFACTURED BY
contact and a thin layer of
oil form a seal separating
the suction port from the discharge port at all times.
HP23-141
TECUMSEH PRODUCTS
FIGURE 10
ROTARY COMPRESSOR INTERNALS
ROTOR
SHAFT
ROLLER
ECCENTRIC
BLADE
FIGURE 11
Figure 12 illustrates the four steps in a rotary
compressor’s continuous intake cycle. The
spring-loaded blade is compressed fully at the
beginning of an exhaust cycle. At this instant the
compression is beginning (1). The roller rotates and
compression continues (2). The suction port is always
separated from the discharge port (3). Intake continues
and the compressed vapor is discharged (4).
ROTARY COMPRESSOR OPERATION
12
COMPLETION
OF INTAKE
BEGINNING OF
COMPRESSION
INTAKE
CONTINUES
COMPRESSION
CONTINUES
AND DISCHARGE
BEGINS
34
INTAKE
CONTINUES
COMPRESSION
CONTINUES
INTAKE
CONTINUES
FIGURE 12
a – Suction Muffler (-141 Units Only)
All HP23-141 units are equipped with a
suction muffler that is externally mounted on
the compressor shell and attached to the
suction line. The muffler contains two wire
mesh filters for added compressor protection.
Refer to figures 1 and 22.
2 – Accumulator
All HP23–141, -460, -510 and -650 units are equipped
with an accumulator that is mounted in the suction
line. The accumulator protects the compressor from
liquid slugging. Refer to figures 1 and 23.
COMPRESSED
VAPOR
DISCHARGED
Page 7
3 – Compressor Cover (Figure 13)
A compressor cover
constructed of vinyl-faced
fiberglass is used on all
HP23-261 through -650 units.
The cover provides an
acoustic barrier. The cover
slides over the compressor
and is held secure with
velcro straps. Slits are
provided for installation
around the discharge and suction lines.
COMPRESSOR COVER
COVER
SLIT FOR DISCHARGE LINE
SLIT FOR
SUCTION
LINE
VELCRO
STRAPS
COMPRESSOR
FIGURE 13
4 – Crankcase Heater
A crankcase heater is used on all HP23–211 through
HP23–650 models. The well-mounted insertion-type
heater is self-regulating. See table 6 for crankcase heater
specifications. Crankcase heater is optional on -141 units.
TABLE 6
HP23 CRANKCASE HEATER RATINGS
Unit
HP23–211/-261/-311
Rating (Watts)
19 watts
OUTDOOR FAN MOTOR AND COMPRESSOR
ACCESS “MOTOR UP” UNITS (3 TONS AND UNDER)
Remove six
screws
Screws
FAN GUARD
WIRING
RACEWAY
REMOVE SIX SCREWS SECURING FAN GUARD.
REMOVE FAN GUARD/FAN ASSEMBLY.
MOTOR
FAN
FIGURE 14
OUTDOOR FAN MOTOR AND COMPRESSOR
ACCESS “FAN UP” UNITS (3.5 TONS AND LARGER)
LIFT FAN GUARD OFF AFTER REMOVING SIX SCREWS
Remove (6) screws
FAN
MOTOR
SPIDER
HP23–411/-413
HP23–411/-413 (CDN)
HP23-411–2,–461,
-510 and -650
27 watts
30 watts
40 watts
C – Outdoor Fan Motor
All units use single–phase PSC fan motors which require
a run capacitor. In all units, the outdoor fan is controlled
by the compressor contactor and defrost relay.
ELECTRICAL DATA tables in this manual show
specifications for outdoor fans used in HP23s.
Two different mounting arrangements are used (fan
up and fan motor up) see figures 14 and 15.
Access to the outdoor fan motor on all units is gained
by removing the six screws securing the fan guard.
See figures 14 and 15. The outdoor fan motor is
attached to the fan guard on “motor up” units and is
removed with the fan guard. See figure 14.
Screws
REMOVE SIX SCREWS
SECURING FAN GUARD.
REMOVE FAN GUARD
TO ACCESS FAN.
FIGURE 15
The reversing valve requires no
maintenance. It is not rebuildable. If the reversing
valve has failed, it must be replaced.
If replacement is necessary, access reversing valve by
removing the control box. HP23-460 through -650
series units have a filler panel that can also be removed
for reversing valve access. Refer to figure 16.
Page 8
HP23 SERIES REVERSING VALVE ACCESS
(CONTROL BOX REMOVAL)
NOTE-UNIT ELECTRICAL COMPONENTS
AND PLUMBING HAVE BEEN DELETED
FOR CLARITY
1 – Turn off all power to unit and
remove control box cover. If rigid
conduit is used to route wiring
to outdoor unit, disconnect
power leads at contactor,
remove hardware attaching
conduit to control box and
move conduit out of the way.
DISCHARGE CAPACITORS.
Thermostat wiring can be left intact.
2 – Label and disconnect the three fan
motor leads from control box. Remove
unit top. Note-fan guard/fan/fan motor
is left intact.
3 – On HP23-460 thru -650 models remove panel. Do not disconnect plumbing.
4 – Remove four screws securing plate to control box.
5 – Disconnect and label compressor and crankcase leads. Pull leads into com-
pressor compartment. Disconnect reversing valve wiring harness from re-
versing valve coil. Disconnect High-pressure limit switch/rexet button.
6 – Remove four screws securing control box to outdoor coil. Remove control
box by lifting straight up and out of unit.
7 – Reverse procedures for reassembly.
FIGURE 16
HP23 COOLING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
EXPANSION VALVE
FILTER / DRIER
WITH INTERNAL CHECK VALVE
SUCTION
HIGH
PRESSURE
STRAINER
HIGH PRESSURE
LIMIT S4
MUFFLER
OUTDOOR
INTERNAL
COMPRESSOR
COIL
LIMIT
III – REFRIGERANT SYSTEM
Refer to figures 17, 18 and 19 for refrigerant
DISTRIBUTOR
(TO OUTDOOR COIL)
SUCTION
SERVICE
PORT
HP23 LIQUID LINE COMPONENTS
EXPANSION
VALVE
EQUALIZER
LINE
TO SENSING
BULB
REFRIGERANT
FLOW IN
HEATING
STRAINER
MODE
(TO INDOOR COIL)
FIGURE 17
OUTDOOR UNIT
REVERSING
VAL VE
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
PRESSURE TAP FITTING
WITH VALVE CORE
DEFROST
THERMOSTAT
(S6)
DRIER WITH
CHECK VALVE
REFRIGERANT
FLOW IN
COOLING
MODE
INDOOR UNIT
TO
R–22
DRUM
HP23 HEATING CYCLE (SHOWING GAUGE MANIFOLD CONNECTIONS)
DEFROST THERMOSTAT
SUCTION
EXPANSION
VAL VE
FILTER / DRIER
WITH INTERNAL
CHECK VALVE
PRESSURE
TO
R–22
DRUM
STRAINER
HIGH
LIQUID
LINE
SERVICE
PORT
THERMOMETER WELL
HIGH PRESSURE
MUFFLER
LIQUID
LINE
SERVICE
PORT
THERMOMETER WELL
LIMIT S4
COMPRESSOR
COMPRESSOR
FIGURE 18
OUTDOOR
COIL
INTERNAL
COMPRESSOR
LIMIT
FIGURE 19
SUCTION
MUFFLER
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
REVERSING
SUCTION
SERVICE
PORT
SUCTION
MUFFLER
-141 ONLY
ACCUMULATOR
-141,-460,-510 AND -650 ONLY
VAL VE
VAPOR
LINE
VAL VE
VALVE OR RFCIII
VAPOR
LINE
VAL VE
CHECK
VAL VE
INDOOR
EXPANSION
OUTDOOR UNIT
NOTE – ARROWS INDICATE DIRECTION OF
REFRIGERANT FLOW
INDOOR UNIT
CHECK
VAL VE
INDOOR
EXPANSION
VALVE OR RFCIII
COIL
COIL
Page 9
A – Service Valves
The liquid line and vapor line service valves and gauge
ports are accessible from outside of the unit. Full
service liquid and vapor line valves are used. See
figures 20 and 21. The service ports are used for leak
testing, evacuating, charging and checking charge.
1 – Liquid Line Service Valve
A full-service liquid line valve made by one of several
manufacturers may be used. All liquid line service
valves function the same way, differences are in
construction. Valves manufactured by Parker are
forged assemblies. Valves manufactured by Primore
are brazed together. Valves are not rebuildable. If a
valve has failed it must be replaced. The liquid line
service valve is illustrated in figure 20.
LIQUID LINE SERVICE VALVE
STEM CAP
KNIFE EDGE SEAL
VALVE STEM
USE SERVICE
WRENCH
(PART #18P66,
54B64 or 12P95)
OUTLET
(TO INDOOR COIL)
TO LINE SET
STEM CAP
VALVE STEM
USE SERVICE WRENCH
(PART #18P66)
TO LINE SET
VALVE
BACKSEATED
(FROM OUTDOOR COIL)
KNIFE EDGE
SEAL
VALVE FRONT
SEATED
IMPORTANT
A schrader valve is not provided on the liquid line
service port. Valve must be backseated to turn off
pressure to service port.
FIGURE 20
The valve is equipped with a service port. There is no
schrader valve installed in the liquid line service port. A
service port cap is supplied to seal off the port.
SERVICE PORT
CLOSED TO LINE SET
AND UNIT
(NO PRESSURE)
INLET
SERVICE PORT CAP
TO OUTDOOR UNIT
(COIL)
SERVICE PORT
OPEN TO
LINE SET
AND CLOSED
TO UNIT
TO OUTDOOR
UNIT (COIL)
The liquid line service valve is a front and back seating
valve. When the valve is backseated the service port is
not pressurized. The service port cap can be removed
and gauge connections can be made.
CAUTION
The service port cap is used to seal the liquid line
service valve. Access to service port requires
backseating the service valve to isolate the
service port from the system. Failure to do so
will cause refrigerant leakage.
IMPORTANT
A schrader valve is not provided on the liquid line
service port. Valve must be backseated to turn off
pressure to service port.
To Access Service Port:
1 – Remove the stem cap. Use a service wrench
(part #18P66, 54B64 or 12P95) to make sure the
service valve is backseated.
2 – Remove service port cap and connect high pressure
gauge to service port.
3 – Using service wrench, open valve stem (one turn
clockwise) from backseated position.
4 – When finished using port, backseat stem with
service wrench. Tighten firmly.
5 – Replace service port and stem cap. Tighten finger
tight, then tighten an additional 1/6 turn.
To Close Off Service Port:
1 – Using service wrench, backseat valve.
a – Turn stem counterclockwise.
b – Tighten firmly.
To Open Liquid Line Service Valve:
1 – Remove the stem cap with an adjustable wrench.
2 – Using service wrench, backseat valve.
a – Turn stem counterclockwise until backseated.
b – Tighten firmly.
3 – Replace stem cap, finger tighten then tighten an
additional 1/6 turn.
To Close Liquid Line Service Valve:
1 – Remove the stem cap with an adjustable wrench.
2 – Turn the stem in clockwise with a service wrench to
front seat the valve. Tighten firmly.
3 – Replace stem cap, finger tighten then tighten an
additional 1/6 turn.
2 – Vapor Line Service Valve
A full service non-backseating vapor line service valve is
used on all HP23 series units. Different manufacturers of
valves may be used. All vapor line service valves function
the same way, differences are in construction.
Page 10
Valves manufactured by Parker are forged
assemblies. Primore and Aeroquip valves are
brazed together. Valves are not rebuildable. If a valve
has failed it must be replaced. The vapor line service
valve is illustrated in figure 21.
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.
VAPOR LINE SERVICE VALVE (VALVE OPEN)
INSERT HEX WRENCH
HERE (PART #49A71 AND
SERVICE WRENCH)
(FROM INDOOR COIL)
SERVICE PORT
INLET
SCHRADER VALVE
CAP
SERVICE PORT
SNAP RING
KNIFE EDGE
SEAL
STEM CAP
OUTLET
(TO COMPRESSOR)
DANGER
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.
3 – Replace stem cap tighten firmly. Tighten finger
tight, then tighten an additional 1/6 turn.
To Close Vapor Line Service Valve:
1 – Remove stem cap with an adjustable wrench.
2 – Using service wrench and 5/16” hex head
extension (part #49A71) turn stem in clockwise to
seat the valve. Tighten firmly.
3 – Replace stem cap. Tighten finger tight, then
tighten an additional 1/6 turn.
B – Plumbing
See figures 22 and 23 for unit refrigerant components.
Field refrigerant piping consists of liquid and vapor
lines from the outdoor unit (sweat connections). Use
Lennox L10 series line sets as shown in table 7 or field
fabricated refrigerant lines.
VAPOR LINE SERVICE VALVE (VALVE CLOSED)
KNIFE EDGE SEAL
(FROM INDOOR COIL)
SERVICE PORT
SERVICE PORT
SCHRADER VALVE OPEN
TO LINE SET WHEN
INLET
CAP
VALVE IS CLOSED
(FRONT SEATED)
SNAP RING
STEM
CAP
INSERT
HEX WRENCH HERE
(PART #49A71 AND
SERVICE
WRENCH)
(VALVE
FRONT SEATED)
OUTLET
(TO COMPRESSOR)
FIGURE 21
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 tighten an
additional 1/6 turn.
To Open Vapor Line Service Valve:
1 – Remove stem cap with an adjustable wrench.
2 – Using service wrench and 5/16” hex head
extension (part #49A71) back the stem out
counterclockwise until the valve stem just touches
the retaining ring.
TABLE 7
LINE SET SPECIFICATIONS
Condensing
Unit
Model No.
HP23–141
HP23–211
HP23–261
HP23–311
HP23–410
HP23–460
HP23–510
HP23–651
*Field Fabricate
**3/8” x 1/4” reducer furnished to adapt unit to 1/4 field fabricated line set.
*** 3/8” x 5/16” reducer furnished to adapt unit to 5/16” line set.
Line
Set
Model No.
*Not Available
L10–21–20
L10–21–25
L10–21–35
L10–21–50
L10–41–20
L10–41–30
L10–41–40
L10–41–50
L10–65–30
L10–65–40
L10–65–50
*Not Available
Length of
Vapor & Liq.
Lines (ft.)
20
25
35
50
20
30
40
50
30
40
50
Liquid
Line
(o.d. ft.)
**1/4
***5/16
***5/16
***5/16
***5/16
3/8 3/4
3/8
3/8
3/8
3/8 7/8
3/8
3/8
3/8 1–1/8
Vapor
Line
(o.d. ft.)
1/2
5/8
5/8
5/8
5/8
3/4
3/4
3/4
7/8
7/8
IV – CHARGING
Unit charge is based on a matching indoor coil and
outdoor coil with a 20 foot (6096mm) line set depending
on date of manufacture. For varying lengths of line set,
refer to table 8.
Liquid Line
Set Diameter
1/4 in. (6 mm)
5/16 in. (8mm)
3/8 in. (10 mm)
*If line set is greater than 20 ft. (6.10m) add this amount. If line set is less
than 20 ft. (6.10m) subtract this amount
TABLE 8
Ounce per 5 foot (ml per mm) adjust from
20 ft. (6096mm)*
1 ounce per 5 feet (30 ml per 1524 mm)
2 ounce per 5 feet (60 ml per 1524 mm)
3 ounce per 5 feet (90 ml per 1524 mm)
Page 11
HP23-141 REFRIGERATION COMPONENTS
SUCTION
MUFFLER
DISTRIBUTOR
SUCTION LINE
DEFROST
SWITCH S6
FILTER/DRIER
W/INTERNAL
CHECK VALVE
EXPANSION VALVE
HIGH PRESSURE
LIMIT S4
RESET BUTTON
SERVICE
VALVES
LIQUID LINE FROM INDOOR COIL
HP23-211 AND LARGER TYPICAL REFRIGERATION COMPONENTS
HIGH PRESSURE
SERVICE
VALVES
LIMIT S4
RESET BUTTON
A – Pumping Down System
CAUTION
Deep vacuum operation (operating compressor
below 0 psig) can cause internal fusite arcing
resulting in a damaged or failed compressor. This
type of damage will result in denial of warranty
claim.
LIQUID LINE
SERVICE PORT
STRAINER
TO OUTDOOR COIL
FIGURE 22
ACCUMULATOR
-460,-510 AND -650 ONLY
DISTRIBUTOR
COMPRESSOR
LIQUID LINE
SERVICE PORT
DEFROST
SWITCH S6
FILTER/DRIER
W/INTERNAL
CHECK VALVE
FIGURE 23
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 in cooling mode.
4– Monitor suction gauge. Stop unit when 0 psig. is
5– Front seat (close) suction line valve.
ACCUMULATOR
SENSING
BULB
DISCHARGE LINE
SERVICE PORT
HIGH PRESSURE
SWITCH PORT
MUFFLER
ROTARY COMPRESSOR
VAPOR LINE FROM
INDOOR COIL
REVERSING VALVE
SUCTION LINE
SENSING BULB
TO
OUTDOOR COIL
REVERSING
VALVE
HIGH PRESSURE
SWITCH PORT
DISCHARGE LINE
SERVICE PORT
VAPOR LINE FROM
INDOOR COIL
MUFFLER
STRAINER
EXPANSION VALVE
LIQUID LINE FROM
INDOOR COIL
reached.
Page 12
B – Evacuating the System
IMPORTANT
The compressor should never be used to evacuate
a refrigeration or air conditioning 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 in the vacuum range.
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 evacuating system to 29 inches (737mm), close
gauge manifold valves to center port, stop vacuum
pump and disconnect from gauge manifold. 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.
4– 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 (754mm) 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 – Leak Testing (To Be Done Only After
Pump Down)
1– Attach gauge manifold and connect a drum of dry
nitrogen to center port of gauge manifold.
2– Open high pressure valve on gauge manifold and
pressurize line set /indoor coil to 150 psig (1034 kPa).
3– Check lines and connections for leaks.
4– Release nitrogen pressure from the system,
correct any leaks and recheck.
CAUTION
When using dry nitrogen, a pressure reducing
regulator must be used to prevent excessive
pressure in gauge manifold, connecting hoses, and
within the system. Regulator setting must not
exceed 150 psig (1034 kpa). Failure to use a regulator
can cause equipment failure resulting in injury.
NOTE-If electronic leak detector is used, add a trace of
refrigerant to the nitrogen for detection by the leak
detector.
D – Charging
Charging must be done in the cooling mode. If system
is completely void of refrigerant, the recommended and
most accurate method of charging is to weigh the
refrigerant into the unit according to the total amount
shown on the unit nameplate.
If weighing facilities are not available or if unit is just
low on charge, the following procedure applies. RFC
and TXV systems use different charging methods.
Separate discharge and vapor line service ports are
provided outside the unit for connection of gauge
manifold during charging procedure as well as a
suction line service port.
1 – Expansion Valve Systems
The following procedures are intended as a general
guide for use with expansion valve systems only. For
best results, indoor temperature should be between 70 °F
and 80 °F. If outdoor temperature is 60 °F (16 °C) or above
the approach method of charging is used. If outdoor
temperature is less than 60 °F (16 °C) the subcooling
method of charging is used. Slight variations in charging
temperature and pressure should be expected. Large
variations may indicate a need for further servicing.
IMPORTANT
The following procedures require accurate
readings of ambient (outdoor) temperature, liquid
temperature and liquid pressure for proper
charging. Use a thermometer with accuracy of +
°F and a pressure gauge with accuracy of +5 PSIG.
APPROACH METHOD (TXV SYSTEMS)
(Ambient Temperature of 60F [16C] or Above)
1 – Connect gauge manifold. Connect an upright
R–22 drum to center port of gauge manifold.
2 – Record outdoor air (ambient) temperature.
3 – Operate indoor and outdoor units in cooling
mode. Allow outdoor unit to run until system
pressures stabilize.
4 – Make sure thermometer well is filled with
mineral oil before checking liquid line
temperature.
2
Page 13
5 – Place thermometer in well and read liquid line
temperature. Liquid line temperature should be
a few degrees warmer than the outdoor air
temperature. Table 9 shows how many degrees
warmer the liquid line temperature should be.
Add refrigerant to make the liquid line
temperature cooler.
Recover refrigerant to make the liquid line
temperature warmer.
TABLE 9
APPROACH METHOD – EXPANSION VALVE SYSTEMS
AMBIENT TEMPERATURE OF 60 F (16 C) OR ABOVE
Model
HP23–141 6
HP23–211 5
HP23–261
HP23–311
HP23–411/413
HP23–411/413 (CAN)
HP23–461/463
HP23–511/513 11
HP23–651/653 7
Liquid Line °F Warmer Than Outside
(Ambient) Temperature
7
14
14
11
11
SUBCOOLING METHOD (TXV SYSTEMS)
(Ambient Temperature Below 60F [16C] )
NOTE- It may be necessary to restrict air flow in order
to reach liquid pressures in the 200-250 psig range
which are required for checking charge. Block equal
sections of air intake panels as shown in figure 24,
moving obstructions sideways until liquid pressures
in the 200-250 psig range are reached.
BLOCKING OUTDOOR COIL
Block outdoor coil one side at a time
with cardboard or plastic sheets until
proper testing pressures are reached.
CARDBOARD OR PLASTIC SHEET
FIGURE 24
1 – Connect gauge manifold. Connect an upright
R–22 drum to center port of gauge manifold.
2 – Operate indoor and outdoor units in cooling
mode. Allow outdoor unit to run until system
pressures stabilize.
HP23 NORMAL OPERATING PRESSURES (COOLING MODE)
OUTDOOR COIL
ENTERING AIR
TEMPERATURE
65° F (TXV)
° F (TXV)
75
° F (TXV)
85
95
° F (TXV)
° F (TXV)
105
65
° F (RFC III)
° F (RFC III)
75
85
° F (RFC III)
° F (RFC III)
95
105
° F (RFC III)
*For an approved match-up the HP23-651/653 must be used with a TXV.
HP23–141 HP23–261 HP23–311 HP23–410
LIQ.
+ 10
PSIG
137
155
182
210
240
130
155
175
210
240
SUC.
+ 10
PSIG
78
79
80
82
83
59
67
75
82
87
HP23–211
SUC.
LIQ.
+ 10
+ 10
PSIG
PSIG
145
72
165
73
195
74
225
77
255
79
150
61
170
68
195
75
230
81
260
85
LIQ.
SUC.
+
10
+ 10
PSIG PSIG
160
74
185
76
215
78
245
80
275
84
150
60
175
67
205
73
240
78
280
81
LIQ.
SUC.
+ 10
+ 10
PSIG PSIG
170
195
225
255
290
165
190
220
255
285 84
TABLE 11
LIQ.
+ 10
PSIG PSIG
75
175
77
200
78
227
80
260
82
295
62
170
69
205
74
230
80
265
305
3 – Make sure thermometer well is filled with
mineral oil before checking liquid line
temperature.
4 – Read liquid line pressure and convert to
condensing temperature using temperature/
pressure conversion chart.
Condensing temperature (read from gauges)
should be a few degrees warmer than the liquid
line temperature.
5 – Place thermometer in well and read liquid line
temperature. Table 10 shows how much
warmer the condensing temperature should be.
TABLE 10
SUBCOOLING METHOD – EXPANSION VALVE SYSTEMS
AMBIENT TEMPERATURE BELOW 60 F (16 C)
Model Condensing Temp°F Warmer Than Liquid Line
HP23–141
HP23–211
HP23–261
HP23–311
HP23–411/413
HP23–411/413 (CAN)
HP23–461/463
HP23–511/513
HP23–651/653
4 +
9 + 2
13 +
9 +
9 + 2
13 +
8 + 2
6 +
7 +
2
2
2
2
2
2
Add refrigerant to make the liquid line
temperature cooler.
Recover refrigerant to make the liquid line
temperature warmer.
6 – When unit is properly charged liquid line
pressures should approximate those given in
table 11.
IMPORTANT
Use table 11 as a general guide for performing
maintenance checks. Table 11 is not a procedure for
charging the system. Minor variations in pressures
may be expected due to differences in installations.
Significant deviations may mean the system is not
properly charged or that a problem exists with some
component in the system. Used prudently, table 11
could serve as a useful service guide.
HP23–410 (CAN)
SUC.
+ 10
PSIG PSIG
75
76
77
79
81
61
68
73
79
82
LIQ.
+
175
200
230
260
295
160
190
225
255
385
10
HP23–461/463 HP23–511/513 HP23–651/653
LIQ.
SUC.
+ 10
76
77
78
79
81
62
68
70
77
81
SUC.
+
10
+ 10
PSIG PSIG
160
185
215
245
280
155
180
210
240
275
72
74
76
78
80
61
63
68
73
76
SUC.
LIQ.
10
+ 10
+
PSIG PSIG
165
185
210
240
275
155
185
210
245
275
72
73
76
78
80
63
64
69
74
78
LIQ.
+ 10
PSIG
150
175
200
235
265
*
**
*
**
**
SUC.
+ 10
PSIG
73
75
76
78
80
*
*
Page 14
2 – RFCIII Systems
The system should not be charged at ambients below
60 F (15C). If charging below 60 F (15C) is required,
the recommended method of charging is to weigh the
refrigerant into the unit according to the total amount
shown on the unit nameplate. For line sets varying from
20 feet , refer to table 8 for refrigerant charge adjustment.
If ambient temperature is above 60 F (15C) use the
subcoooling method outlined below.
SUBCOOLING METHOD (RFCIII SYSTEMS)
(Ambient Temperature Above 60F [16C] )
1 – Connect gauge manifold. Connect an upright
R–22 drum to center port of gauge manifold.
2 – Operate indoor and outdoor units in cooling
mode. Allow outdoor unit to run until system
pressures stabilize.
3 – Make sure thermometer well is filled with
mineral oil before checking liquid line
temperature.
4 – Read liquid line pressure and convert to
condensing temperature using temperature/
pressure conversion chart.
Condensing temperature (read from gauges)
should be a few degrees warmer than the
liquid line temperature.
SUBCOOLING METHOD––RFCIII Systems*
Condensing Temp°F Warmer
Outdoor
Unit
HP23–141
HP23–211
HP23–261
HP23–311
HP23–410 CB/CBH19–41 17 15 14 11 8 5
HP23–410 (CAN) CB/CBH19–41
HP23–460
*Approved matchups only
Indoor
Unit
CB/CBH19–21
CB/CBH19–21
CB/CBH19–26
CB/CBH19–31
CB/CBH19–41
CB19–51HP23–510
5 – Place thermometer in well and read liquid line
temperature. Table 12 shows how much
warmer the condensing temperature should be.
Than Liquid Line At Various
65F75F85F95 F 105F 115F
5
13
12
12
18 16 15 12 9 6
11
11
5
13
12
12
10
10
Ambients
4
1
13
12
11
9
10
8
7
6
8
7
0
0
6
4
7
5
6
4
4
2
5
2
Add refrigerant to make the liquid line
temperature cooler.
Recover refrigerant to make the liquid line
temperature warmer.
6 – When unit is properly charged liquid line
pressures should approximate table 11.
E – Oil Charge
Refer to table 5 on page 6.
V – MAINTENANCE
At the beginning of each heating or cooling season, the
system should be cleaned as follows:
A – Outdoor Unit
1 – Clean and inspect outdoor coil. (Coil may be
flushed with a water hose).
2 – Visually inspect all connecting lines, joints and
coils for evidence of oil leaks.
IMPORTANT
If insufficient heating or cooling occurs, the unit
should be gauged and refrigerant charge checked.
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 – Adjust blower cooling speed. Static pressure
drop over coil should be checked to determine
correct blower CFM. Refer to Lennox
Engineering Handbook.
3 – Belt Drive Blowers - Check condition and
tension.
4 – Check all wiring for loose connections.
5 – Check for correct voltage at unit.
6 – Check amp–draw on blower motor.
Unit nameplate_________Actual_________.
Page 15
HP23 SINGLE PHASE OPERATING SEQUENCE
25
18
21
19
24
20
20
27
23
1
1
7
11
15
6
12
9
2
16
8
10
13
3
17
4
22
26
5
Page 16
HP23 SINGLE PHASE OPERATING SEQUENCE
A–HP23 P Voltage Operation Sequence
This is the sequence of operation for HP23 “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 electromechanical or electronic.
NOTE– Transformer in indoor unit supplies power (24
VAC) to the thermostat and outdoor unit controls.
COOLING:
1 – Cooling demand initiates at Y1 in the thermostat.
Internal thermostat wiring energizes terminal O
energizing the reversing valve L1.
2 – 24VAC energizes compressor contactor K1.
3 – K1-1 N.O. closes energizing compressor (B1) and
outdoor fan motor (B4).
4 – Outdoor fan motor (B4) begins immediate op-
eration.
5 – Compressor (B1) begins start-up. Hard start
contactor K31 remains closed during start-up
and start capacitor C7 remains in the circuit. As
the compressor gains speed, K31 is energized.
When K31 is energized the contacts open and
start capacitor C7 is taken out of the circuit.
END OF COOLING DEMAND:
6 – Cooling demand is satisfied. Terminal Y1 is de-en-
ergized.
7 – Thermostat terminal O is de-energized.
8 – Reversing valve L1 is de-energized
9 – Compressor contactor K1 is de-energized.
10 – K1-1 opens and compressor (B1) and outdoor
fan motor (B4) are de-energized and stop immediately.
FIRST STAGE HEAT:
11 – Heating demand initiates at W1 in the ther-
mostat.
12 – 24VAC energizes compressor contactor K1.
13 – K1-1 N.O. closes energizing compressor and
outdoor fan motor.
14 – See steps 4 and 5.
END OF FIRST STAGE HEAT:
15 – Heating demand is satisfied. Terminal W1 is
de-energized.
16 – Compressor contactor K1 is de-energized.
17 – K1-1 opens and compressor (B1) and outdoor
fan motor (B4) are de-energized and stop im-
mediately.
DEFROST MODE:
18 – During heating operation when outdoor coil tem-
perature drops below 35 +
(thermostat) S6 closes.
19 – Defrost control CMC1 begins timing. If defrost
thermostat (S6) remains closed at the end of
the 30,60 or 90 minute period, defrost relay K4
energizes and defrost begins.
20 – N.O. K4-3 closes energizing the reversing valve.
21 – N.O. K4-1 closes energizing W1 on TB1 terminal
strip of indoor unit. Indoor unit operates in the
first stage heat mode.
22 – N.C. K4-2 opens and outdoor fan motor B4 stops.
23 – Defrost continues 14 + 1 minutes or until ther-
mostat switch (S6) opens. When defrost ther-
mostat opens defrost control CMC1 loses
power and resets.
24 – Defrost relay K4 is de-energized.
25 – K4-1 opens and W1 on terminal strip TB1 of
indoor unit is de-energized.
26 – K4-2 closes and the outdoor fan begins operation.
27 – K4-3 opens de-energizing the reversing valve.
4 F Defrost Switch
Page 17
HP23 THREE PHASE OPERATING SEQUENCE
24
17
20
23
19
26
6
5
1
14
10
1
7
8
3
9
4
13
21
25
12
16
22
18
2
11
15
Page 18
HP23 THREE PHASE OPERATING SEQUENCE
A–HP23 P Voltage Operation Sequence
This is the sequence of operation for HP23 “Y”, “G”,
and “J” voltage units. The sequence is outlined by
numbered steps which correspond to circled numbers on the adjacent diagram.
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 – Cooling demand initiates at Y1 in the thermostat.
Internal thermostat wiring energizes terminal O
energizing the reversing valve L1.
2 – 24VAC energizes compressor contactor K1.
3 – K1-1 N.O. closes energizing compressor (B1) and
outdoor fan motor (B4).
4 – Compressor (B1) and outdoor fan motor (B4)
begin immediate operation.
END OF COOLING DEMAND:
5 – Cooling demand is satisfied. Terminal Y1 is
de-energized.
6 – Thermostat terminal O is de-energized.
7 – Reversing valve L1 is de-energized
8 – Compressor contactor K1 is de-energized.
9 – K1-1 opens and compressor (B1) and outdoor
fan motor (B4) are de-energized and stop im-
mediately.
FIRST STAGE HEAT:
10 – Heating demand initiates at W1 in the ther-
mostat.
11 – 24VAC energizes compressor contactor K1.
12 – K1-1 N.O. closes energizing compressor
and outdoor fan motor.
13 – Compressor (B1) and outdoor fan motor (B4)
begin immediate operation.
END OF FIRST STAGE HEAT:
14 – Heating demand is satisfied. Terminal W1 is
de-energized.
15 – Compressor contactor K1 is de-energized.
16 – K1-1 opens and compressor (B1) and outdoor
fan motor (B4) are de-energized and stop im-
mediately.
DEFROST MODE:
17 – During heating operation when outdoor coil
temperature drops below 35 +
Switch (thermostat) S6 closes.
18 – Defrost control CMC1 begins timing. If defrost
thermostat (S6) remains closed at the end of
the 30,60 or 90 minute period, defrost relay K4
energizes and defrost begins.
19 – N.O. K4-3 closes energizing the reversing valve.
20 – N.O. K4-1 closes energizing W1 on TB1 terminal
strip of indoor unit. Indoor unit operates in the
first stage heat mode.
21 – N.C. K4-2 opens and outdoor fan motor B4 stops.
22 – Defrost continues 14 + 1 minutes or until ther-
mostat switch (S6) opens. When defrost ther-
mostat opens defrost control CMC1 loses
power and resets.
23 – Defrost relay K4 is de-energized.
24 – K4-1 opens and W1 on terminal strip TB1 of
indoor unit is de-energized.
25 – K4-2 closes and the outdoor fan begins operation.
26 – K4-3 opens de-energizing the reversing valve.
4 F Defrost
Page 19
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