Lennox CHA16-060 User Manual

Page 1
 2001 Lennox Industries Inc.
Litho U.S.A.
Corp. 0109-L2
Service Literature
CHA/CHP16
CHP20
2 to 5 ton (7.0 to 17.6 kW)
CHA/CHP16, CHP20 SERIES UNITS
CHA/CHP16 and CHP20 series units in the 2 through 5 ton
(7.0 through 17.6 kW) sizes are designed for outdoor roofĆ
top or ground level installations in light commercial applicaĆ
tions. Electric heat is available in several kW sizes. Models
are available in single or three phase power supply and can
be utilized in downflow or horizontal supply and return air.
CHA/CHP16-024/030 model units are equipped with a
reciprocating compressor. CHA/CHP16-036/060 and
CHP20-024/060 model units are equipped with scroll
compressors. The scroll compressor offers high voluĆ
metric efficiency, quiet operation and the ability to start
under system load. Continuous flank contact, mainĆ
tained by centrifugal force, minimizes gas leakage and
maximizes efficiency. The motor is internally protected
from excessive current and temperature.
CHA/CHP16 and CHP20 model units are designed to acĆ
cept any of several different thermostat control systems
with minimum field wiring. Control options such as econĆ
omizer, warm up kit, Honeywell T7300 thermostat or
Honeywell T8600/T8611/T8621 thermostat controls
connect to the unit with jackĆplugs. When plugged in the
controls become an integral part of the unit wiring. Low
voltage thermostat connections facilitate thermostat
field wiring.
Optional electric heat is field installed. Electric heat operĆ
ates in single or multiple stages depending on the kW size.
5kW through 25 kW sizes are available for the CHA/CHP16
and CHP20 units.
Information in this manual is for use by a qualified service
technicial only. All specifications in this manual are subject
to change. Procedures outlined in this manual are repesĆ
ented as a recommendation only and do not supersede or
replace state or local codes.
IMPORTANT
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personĆ
al injury or loss of life. Installation and service must
be performed by a qualified installer, service agency
or the gas supplier.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconĆ
nect switch(es). Unit may have multiple
power supplies.
WARNING
Refrigerant can be harmful if it is inhaled. Refrigerant
must be used and recovered responsibly.
Failure to follow this warning may result in personal
injury or death.

Lennox CHA16-060 Specifications

General

Cooling Capacity	60, 000 BTU/h
SEER Rating	16
Energy Efficiency Ratio (EER)	12.5
Refrigerant	R-410A
Compressor Type	Scroll
Sound Level	74 dB
Stages	Single Stage
Voltage	208/230V
Phase	1

Summary

Unit Information and Series Overview

Safety Precautions

Critical warnings regarding installation, service, and refrigerant.

Electrostatic Discharge (ESD) Precautions

ESD Prevention Guidelines

Procedures to prevent damage to electronic components from static discharge.

CHA16 Electrical Data

CHP16 Electrical Data

CHP20 Electrical Data

Single Phase Electrical Specifications

Three Phase Electrical Specifications

Defrost Control System (CMC1)

Defrost Control Overview and Timings

Solid state control for automatic defrost switching.

Timing Pin Configuration

Cooling System Components and Operation

Scroll Compressor Technology

Scroll Compressor Design and Operation

Explanation of the scroll compressor's mechanical design and function.

Scroll Compressor Advantages and Limitations

Refrigerant Circuit Components

System Protection and Ancillary Components

Low Ambient Controls (K58, S11)

Optional Electric Heat (ECH16) Components

Electric Heat Matchups and Ratings

Compatibility and performance ratings for electric heat kits.

Electric Heat Relays and Contactors

Electric Heat Safety and Control Components

Thermal Sequencing Relays (K32, K33) and Fuses (F3)

High Temperature Limit Controls (S15, S20)

Electrical Connections and Power Supply

Power Supply Requirements and Safety

Details on power supply, voltage, and safety warnings.

Unit Start-Up Procedures

Crankcase Heater Energization

Preliminary Checks and Voltage Verification

Cooling System Service Checks

Refrigerant Handling and Charging

Safety and procedures for refrigerant handling and charging.

Gauge Manifold Attachment and Setup

Cooling Start-Up and Compressor Rotation

Steps for starting the unit in cooling mode and checking compressor rotation.

Heating System Service Checks

Heat Pump Heating Operation

Indoor Blower Operation and Adjustment

Measuring Discharge Static Pressure

Blower Speed Adjustment

Routine Maintenance Procedures

Motor Lubrication Guidelines

Filter Inspection and Cleaning

Condenser Coil Cleaning and Inspection

Electrical System Checks

Wiring Diagrams and Operation Sequence

CHP16/20 P Voltage Wiring Diagram

Schematic for P voltage units showing electrical connections.

CHP16/20 P Voltage Sequence of Operation

Step-by-step explanation of cooling, heating, and defrost modes.

CHP16/20 Y Voltage Wiring Diagram

CHP16/20 Y Voltage Wiring Diagram

Schematic for Y voltage units showing electrical connections.

CHP16 G, J Voltage Wiring Diagram

CHP16 G, J Voltage Wiring Diagram

Schematic for G/J voltage units showing electrical connections.

CHP16/20 Y and G Voltage Sequence of Operation

Y and G Voltage Operation Sequences

Operational sequences for Y and G voltage units in different modes.

CHA16 P Voltage Wiring Diagram

CHA16 P Voltage Wiring Diagram

Schematic for CHA16 P voltage units showing electrical connections.

CHA16 Y Voltage Wiring Diagram

CHA16 Y Voltage Wiring Diagram

Schematic for CHA16 Y voltage units showing electrical connections.

CHA16 G, J Voltage Wiring Diagram

CHA16 G, J Voltage Wiring Diagram

Schematic for CHA16 G/J voltage units showing electrical connections.

ECH16 5kW Electric Heat Wiring and Sequence

ECH16-5kW-P Voltage Wiring Diagram

Schematic for 5kW electric heat unit wiring.

ECH16 5kW P Voltage Sequence of Operation

Operational sequence for 5kW electric heat unit.

ECH16 7/10kW Electric Heat Wiring and Sequence

ECH16-7/10kW-P Voltage Wiring Diagram

Schematic for 7/10kW electric heat unit wiring.

ECH16-7/10kW-P Voltage Sequence of Operation

Operational sequence for 7/10kW electric heat unit.

ECH16 15/20/25kW Electric Heat Wiring and Sequence

ECH16-15/20/25kW P Voltage Wiring Diagram

Schematic for 15/20/25kW electric heat unit wiring.

ECH16 15/25kW P Voltage Sequence of Operation

Operational sequence for 15/25kW electric heat unit.

ECH16 5/15kW Electric Heat Wiring and Sequence (Y Voltage)

ECH16-5/7/10/15kW Y Voltage Wiring Diagram

Schematic for Y voltage electric heat unit wiring.

ECH16-5/15kW Y Voltage Sequence of Operation

Operational sequence for Y voltage electric heat unit.

ECH16 20/25kW Electric Heat Wiring and Sequence (Y Voltage)

ECH16-20/25kW Y Voltage Wiring Diagram

Schematic for Y voltage electric heat unit wiring.

ECH16-20 / 25kW Y Voltage Sequence of Operation

Operational sequence for Y voltage electric heat unit.

ECH16 G/J/M Voltage Electric Heat Wiring and Sequence

ECH16-7/10/15/20/25kW G, J, M Voltage Wiring Diagram

ECH16-20 / 25kW G, J, M Voltage Sequence of Operation

Electromechanical Thermostat with Economizer Wiring

Thermostat and Economizer Wiring Diagram

Electromechanical Thermostat and Economizer Operation

Thermostat and Economizer Operation Sequence