Lennox CHA16 User Manual

SERVICE
CHA16
UNIT
INFORMATION
6-25 TON UNITS
Page 1
1994 Lennox Industries Inc.
Corp. 9321-L3 Litho U.S.A.
CHA16 SERIES
CHA16 series units are packaged commercial air condition
ers. All units provide twostage dx cooling. 15 ton units are
equipped with three compressors. All other units are
equipped with two compressors. Optional electric heat sec
tions install inside the cabinet and are available in 10kW
through 90kW input sizes. Electric heat operates in single or
multiple stages depending on kW input size. Units are de
signed for rooftop or side of building installation with either
bottom or horizontal discharge and return air.
For commercial applications, the CHA16 is designed to ac
cept any of several different thermostat control systems with
minimum field wiring. Control options such as economizer,
warm up kit, Honeywell W973 control, Honeywell W7400
control or other field specified controls connect to the unit
with jack-plugs. When plugged in" the controls become an
integral part of the unit wiring. Units are also equipped with a
low voltage terminal strip to facilitate thermostat field wiring.
All specifications in this manual are subject to change.
TABLE OF CONTENTS
Introduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications Pages 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Data Page 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Performance Data Pages 8-10. . . . . . . . . . . . . . . . . . . . . . .
Accessory Air Resistance Data Pages 11-12. . . . . . . . . . . . . . . . .
Parts Arrangement Pages 12-16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I- APPLICATION Page 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II- UNIT COMPONENTS Pages 16-27. . . . . . . . . . . . . . . . . . . . . . . . .
Control Box Components Pages 16-19. . . . . . . . . . . . . . . . . . . . . .
Cooling Components Pages 19-25. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Compartment / Power MakeUp Pages 25-26. . . . . . . . . .
III- ELECTRICAL CONNECTIONS Page 27. . . . . . . . . . . . . . . . . . . .
IV- PLACEMENT AND INSTALLATION Page 27. . . . . . . . . . . . . . .
V- START UP - OPERATION Page 27. . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks Page 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling / Heating Start Up Page 27. . . . . . . . . . . . . . . . . . . . . . . . .
Safety or Emergency Shut Down Page 27. . . . . . . . . . . . . . . . .
VI- COOLING SYSTEM CHECKS Pages 27-28. . . . . . . . . . . . . . . . . .
Gauge Manifold Attachment Page 27. . . . . . . . . . . . . . . . . . . . . . .
Charging Pages 27-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII-INDOOR BLOWER OPERATION / ADJUSTMENT
Pages 28-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Operation Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining Unit CFM Pages 28-29. . . . . . . . . . . . . . . . . . . . . . . . .
Blower Belt Adjustment Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII- MAINTENANCE Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Air Blower Wheel Page 29. . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator and Condenser Coil Page 29. . . . . . . . . . . . . . . . . . . .
Electrical Page 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IX- ELECTRIC HEAT COMPONENTS Pages 30-39. . . . . . . . . . . . .
Matchups and Ratings Pages 30-34. . . . . . . . . . . . . . . . . . . . . . . .
Electric Heat Components Pages 34-39. . . . . . . . . . . . . . . . . . . . .
X- ACCESSORIES Pages 40-54. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMF16 Roof Mounting Frame Page 40. . . . . . . . . . . . . . . . . . . . .
OAD16 Outdoor Air Damper Page 40. . . . . . . . . . . . . . . . . . . . . . .
Economizers Pages 40-46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transitions and Supply / Return Diffusers Page 46. . . . . . . . . . . .
Firestats Page 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cycle Control Kit Pages 46-47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Ambient Kit Page 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Panels Pages 48-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commercial Controls Hardware Pages 49-51. . . . . . . . . . . . . . . .
Optional Commercial Controls Systems Pages 51-54. . . . . . . . .
Clocks / Timers Page 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XI- WIRING DIAGRAMS / OPERATION SEQUENCE
Pages 5687. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Unit Operation Sequence Pages 5657. . . . . . . . . . . . . . . .
REMD16M Economizer Operation Sequence Pages 58-59. . . .
Warm Up Kit Operation Sequence Pages 60-61. . . . . . . . . . . . . .
Unit Operation Sequences Pages 62-68. . . . . . . . . . . . . . . . . . . .
Electric Heat Operation Sequence Pages 69-87. . . . . . . . . . . . . .

Lennox CHA16 Specifications

General

Brand	Lennox
Model	CHA16
Category	Air Conditioner
Language	English