Lennox HP22-411 Service Manual
Lennox HP22-411 Service Manual

Lennox HP22-411 Service Manual

Hp22 series units

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SERVICE
The HP22 is a high efficiency residential split-system
heat pump which features a scroll compressor. It oper
ates much like a standard heat pump, but the HP22's
scroll compressor is unique in the way that it compresses
refrigerant. Several models are available in sizes ranging
from 2 through 3-1/2 tons. The series uses expansion
valves in the outdoor unit and in the indoor unit.
Model No.
Face area (sq.ft.)
inside / outside
Tube diameter (in.)
Outdoor Coil
No. of Rows
Fins per inch
Diameter (in.)
No. of Blades
Motor hp
Outdoor Fan
Cfm
RPM
Watts
Refrigerant-22 (charge furnished)
Liquid line connection
Vapor line connection
Model No.
Line voltage data - 60hz./1 phase
Rated load amps
Power factor
Locked rotor amps
Full load amps
Outdoor Coil
Fan Motor
Locked rotor amps
Max fuse or c.b. size (amps)
*Minimum circuit ampacity
*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
UNIT
INFORMATION
Corp. 8906 L5
Replaces Corp. 8903-L4
t HP22 SERIES UNITS
This manual is divided into sections which discuss the
major components, refrigerant system and charging pro
cedures, maintenance and operation sequences. All
specifications in this manual are subject to change.

SPECIFICATIONS

HP22-261
HP22-311
8.57/
15.34/
11.83
15.94
3/8
3/8
1.75
2
18
18
20
24
4
3
1/6
1/6
2300
3350
840
820
185
210
8 lbs. 1 oz.
10 lbs. 13 oz.
3/8
3/8
5/8
3/4

ELECTRICAL DATA

HP22-261
HP22-311
208/230V
208/230V
11.6
13.5
.96
.96
62.5
76
1.1
1.1
2.0
2.0
25
30
15.6
18.0
Page 1
HP22-411
HP22-461
15.34/
17.53/
15.94
18.22
3/8
3/8
2
2
18
18
24
24
3
3
1/6
1/6
3350
3400
820
820
210
200
11 lbs. 2 oz.
12 lbs. 8 oz.
3/8
3/8
3/4
7/8
HP22-411
HP22-461
208/230V
208/230V
18
20
.96
.97
90.5
107
1.1
1.1
2.0
2.0
35
40
23.6
26.1
HP22
Litho U.S.A.

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Table of Contents
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Summarization of Contents

III-UNIT COMPONENTS
A-Transformer
Explains transformer power source for unit controls.
B-Contactor
Details the contactor for compressor energization.
C-TD1-1 Time Delay
Describes the time delay for compressor startup.
D-Terminal Strip
Explains the terminal strip for wiring connections.
E-Compressor
Shows specifications of compressors used in HP22 units.
F-Temperature Sensor
Describes the compressor temperature sensor function and safety.
G-Outdoor Fan Motor
Details the control of the outdoor fan motor.
H-Temperature Compensation Thermistor
Explains the function of the thermistor in the fan wiring.
I-Service Light Thermostat
Explains the service light thermostat function.
J-Dual Capacitor
Describes the dual capacitor for motor operation.
K-Defrost Thermostat
Details the defrost thermostat's role in the defrost cycle.
L-Reversing Valve and Solenoid
Explains the reversing valve for refrigerant flow control.
M-Defrost Timer
Describes the CMC defrost control operation.
SOLID STATE DEFROST TIMER
Timing Pins
Explains pins for setting defrost intervals.
Timing Jumper
Details the jumper for setting defrost intervals.
24V Terminal
Describes the 24V terminal function.
Defrost Control Terminals
COM Terminal
Explains the COM terminal providing 24VAC Common.
HLD Terminal
Describes the HLD terminal for timer hold function.
OUT Terminal
Explains the OUT terminal controlling the defrost relay.
RST Terminal
Notes that the RST terminal is not used.
TST Pins
Details TST pins for troubleshooting and testing.
IV-REFRIGERANT SYSTEM
A-Plumbing
Details refrigerant piping and line sets.
B-Service Valves
Explains access and use of service valves for charging.
V-CHARGING
A-Leak Testing
Steps for testing refrigerant lines for leaks.
B-Evacuating the System
Steps for evacuating the refrigerant system.
C-Charging
Procedures for charging refrigerant into the unit.
D-Oil Charge
Shows the factory oil charge for HP22 series units.
VI-Maintenance
A-Heat Pump Unit
Cleaning and inspection of the outdoor unit.
B-Indoor Coil
Cleaning and inspection of the indoor coil.
C-Indoor Unit
Maintenance for indoor unit components.
VII-WIRING DIAGRAMS AND OPERATION SEQUENCE
A-Field Wiring
Diagram and explanation of field wiring connections.
UNIT DIAGRAM LOW VOLTAGE OPERATION SEQUENCE
Explains low voltage operation sequence step-by-step.
LINE VOLTAGE OPERATION SEQUENCE
Explains line voltage operation sequence step-by-step.

Table of Contents