Lennox CHA16-048 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 CHA16-048 Specifications

General

Brand	Lennox
Model	CHA16-048
Category	Air Conditioner
Language	English

Summary

Unit Information

Safety Precautions

Highlights important safety warnings regarding installation and service.

CHA16 Specifications

Cooling and Electric Heat Ratings

Lists cooling capacity, SEER, EER, and electric heat ratings for CHA16 models.

CHP16 Specifications

Cooling and Heating Specifications

Lists cooling, high temp heating, and low temp heating ratings for CHP16.

Blower and Coil Data

Details blower, indoor coil, and outdoor coil specifications.

CHP20 Specifications

Cooling and Heating Performance

Lists cooling and heating capacities, ratings, and C.O.P. for CHP20.

Component Specifications

Details blower, coil, and electrical data for CHP20 units.

Electrical Data CHA16

Single Phase Electrical Data

Provides electrical data for single-phase CHA16 units.

Three Phase Electrical Data

Details electrical data for three-phase CHA16 units.

Electrical Data CHP16

Single Phase Electrical Data CHP16

Electrical specifications for single-phase CHP16 units.

Three Phase Electrical Data CHP16

Electrical specifications for three-phase CHP16 units.

Blower Data CHA16

Blower Data CHP16/20

Unit Components

Control Box Components Overview

Unit Components (Continued)

Defrost Control CMC1

Details the solid-state defrost control and its functions.

Timing Pins and Jumper Configuration

Cooling Components

Reciprocating Compressor Description

Scroll Compressor

Freezestat Switch S49 Operation

Scroll Compressor (Continued)

Optional Electric Heat Components

Electric Heat Relays and Contactors

Thermal Relays, Fuses, and Limits

Start-Up and Operation

Crankcase Heaters and Preliminary Checks

Cooling System Service Checks

Gauge Manifold Attachment and Cooling Start Up

Steps for refrigerant charging and cooling start-up.

Compressor Rotation and Charging

Procedures for compressor rotation and refrigerant charging.

Heating System Service Checks

Heat Pump Heating Checks

Indoor Blower Operation and Adjustment

Blower Operation and Static Pressure Measurement

Maintenance Procedures

Lubrication and Filter Maintenance

Condenser Coil and Electrical Checks

Accessories Overview

Economizer Operation and Control

Explains economizer operation and enthalpy control setpoints.

Wiring Diagrams and Operation Sequence

CHP16/20 P Voltage Wiring Diagram

Wiring diagram for P voltage units.

Sequence of Operation - Cooling and Heating

Detailed sequences for cooling, heating, and defrost modes.

Wiring Diagrams and Operation Sequence (Continued)

CHP16/20 Y Voltage Wiring Diagram

Wiring diagram for Y voltage units.

CHP16 G, J Voltage Wiring Diagram

Wiring diagram for G and J voltage units.

Y and G Voltage Sequence of Operation

Details cooling, heating, and defrost sequences for Y/G voltage.

Sequence of Operation - Y Voltage

Sequence of Operation - G, J Voltage

Electromechanical Thermostat with Economizer

Thermostat Wiring Diagram

Wiring diagram for the thermostat and economizer controls.

Thermostat Operation Sequence

Describes economizer operation sequences based on enthalpy.