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Lennox HP29-024 User Manual

Lennox HP29-024
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Page #11 background image
Page 11
IMPORTANT
Service valves are closed to the heat pump unit
and open to line set connections. Do not open un-
til refrigerant lines have been leak tested and
evacuated. All precautions should be exercised to
keep the system free from dirt, moisture and air.
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 Vapor Line Service Valve:
1 Remove stem cap with an adjustable wrench.
2 Using service wrench and hex head extension (5/16 for
vapor line and 3/16 for liquid line), back the stem out
counterclockwise until the valve stem just touches the
retaining ring.
3 − Replace stem cap tighten firmly. Tighten finger tight, then
tighten an additional 1/6 turn.
FIGURE 12
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)
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 Vapor Line Service Valve:
1 Remove stem cap with an adjustable wrench.
2 − Using service wrench and hex head extension (5/16 for
vapor line and 3/16 for liquid line), turn stem clockwise to
seat the valve. Tighten firmly.
3 − Replace stem cap. Tighten finger tight, then tighten an
additional 1/6 turn.
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Lennox HP29-024 Specifications

General IconGeneral
Cooling Capacity (BTU)24000
Refrigerant TypeR-410A
Number of Stages1
Voltage (V)208/230
Phase1
Unit Weight (lbs)220

Summary

HP29 Series Units

Specifications Overview

Detailed technical specifications for various HP29 models.

Electrical Data

Line Voltage Parameters

Electrical parameters for different HP29 models, including amps and power factor.

Unit Components

Control Box and Wiring

Details on the electrical control box and thermostat wiring identification.

Component Illustration

Illustration of major unit components like compressor and control box.

Unit Components Details

Transformer T5 Details

Description and function of the step-down transformer T5.

Dual Capacitor C12 Function

Explanation of dual capacitors for single-phase motors.

Unit Components Details Continued

Potential Relay K31 Operation

Role of the potential relay in starting single-phase reciprocating compressors.

Start Capacitor C7 Usage

Function and rating of the start capacitor for reciprocating compressors.

Run Capacitor C1 for Fan Motors

Capacitor rating for fan motors in three-phase units.

Outdoor Fan Relay K10 Function

Relay for energizing the outdoor fan motor.

Compressor Contactor K1 Role

Contactor for energizing the compressor.

Defrost System (Reciprocating)

Defrost Thermostat S6

Operation and settings of the defrost thermostat.

Defrost Control CMC1

Functions of the defrost control board, including timing and diagnostics.

Defrost System Features

Defrost Timing Pin Settings

Explanation of timing pin selections for defrost cycle initiation.

Pressure Switch Safety Circuit

How pressure switches interact with the defrost control safety circuit.

Diagnostic LED Interpretation

Interpretation of diagnostic LEDs for troubleshooting defrost control issues.

Defrost System (Post-2002)

Defrost Thermostat Operation

Operation of the defrost thermostat for newer units.

Defrost Control Board Functions

Functions of the defrost control board in newer systems.

Defrost Timing Adjustments

Timing adjustments for the defrost cycle in newer units.

Defrost System Options

Optional Unit Pressure Switch Circuit

Pressure switch integration for optional units.

Optional Unit Diagnostic LEDs

LED indicators for troubleshooting optional units.

Time-Delay Relay Function

Function of the 5-minute time delay feature.

Ambient Thermistor & Service Light

Connections for ambient thermistor and service light.

Compressor Specifications and Rotation

Reciprocating Compressor Data

Specifications for reciprocating compressors used in HP29 units.

Scroll Compressor Data

Specifications for scroll compressors used in HP29 units.

Three-Phase Compressor Phasing

Procedures for ensuring correct three-phase compressor phasing.

Refrigerant System Components

Compressor Cover Details

Description of the compressor cover's construction and purpose.

Crankcase Heater Function

Function and ratings of the crankcase heater for reciprocating compressors.

Condenser Fan Motor Access

Access and specifications for the condenser fan motor.

Reversing Valve Operation

Function of the reversing valve for refrigerant flow control.

Service Valve Description

Description and accessibility of service valves for refrigerant handling.

Refrigerant System Valve Operation

Liquid Line Service Valve Use

Procedures for opening and closing liquid line service valves.

Refrigerant System Valve Operation Continued

Vapor Line Service Valve Use

Procedures for opening and closing vapor line service valves.

Ball Type Vapor Line Valve

Specifics on ball-type service valves for 5-ton units.

Plumbing and Line Sets

Line Set Specifications Table

Table showing line set lengths, liquid and vapor line diameters for models.

Refrigeration Components Diagram

Diagram of outdoor unit refrigerant components.

Charging Procedures

System Pumping Down

Procedure for pumping down the system before leak checking.

System Leak Testing

Steps for leak testing the system before evacuation.

System Evacuation Steps

Procedures for evacuating the refrigerant system to a specific vacuum level.

Charging Methods

Approach Method Charging (TXV)

Charging procedure for ambient temperatures 60°F or above.

Subcooling Method Charging (TXV)

Charging procedure for ambient temperatures below 60°F.

Charging Methods Continued

Normal Operating Pressures

Typical operating pressures for cooling and heating modes.

Refrigerant Line Noise Prevention

Vertical Line Set Installation

Procedures for installing line sets on vertical runs to prevent noise.

Refrigerant Line Noise Prevention Continued

Horizontal Line Set Installation

Procedures for installing line sets on horizontal runs to prevent noise.

Line Set Vertical-Horizontal Transition

Method for transitioning line sets between vertical and horizontal runs.

Outdoor Unit Placement Guidelines

Guidelines for placing the outdoor unit and line set.

Wiring Diagrams and Operation Sequence

Single-Phase Reciprocating Wiring

Wiring diagram for single-phase units with reciprocating compressors.

Single-Phase Reciprocating Wiring Details

Reciprocating Compressor Wiring Diagram

Detailed wiring diagram for HP29 single-phase reciprocating compressor units.

Single-Phase Reciprocating Wiring Diagrams

Reciprocating Compressor Wiring Details

Detailed wiring diagram for HP29 single-phase reciprocating compressor units.

Single-Phase Scroll Compressor Wiring

Scroll Compressor Wiring Diagram

Wiring diagram for single-phase units with scroll compressors.

Single-Phase Scroll Compressor Wiring Details

Scroll Compressor Wiring Details

Detailed wiring diagram for HP29 single-phase scroll compressor units.

Single-Phase Scroll Compressor Wiring Layout

Scroll Compressor Wiring Layout

Detailed wiring diagram for HP29 single-phase scroll compressor units.

Single-Phase Operating Sequence

HP29 P Voltage Sequence

Sequence of operation for HP29 'P' voltage units, covering cooling, heating, and defrost.

Three-Phase Compressor Wiring

Three-Phase Wiring Diagram (Reciprocating/Scroll)

Wiring diagram for three-phase HP29 units with reciprocating or scroll compressors.

Three-Phase Wiring Diagram Details

Three-Phase Wiring Diagram Details

Wiring diagram for three-phase HP29 units with reciprocating or scroll compressors.

Three-Phase Operating Sequence

Three-Phase Operating Sequence

Sequence of operation for three-phase HP29 units, covering cooling, heating, and defrost.

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