SERVICE GCS16
UNIT
INFORMATION 6-25 TON UNITS
Page 1 1994 Lennox Industries Inc.
Corp. 9322-L3 Litho U.S.A.
GCS16 SERIES
GCS16 series units in the 6 ton and larger cooling size are
packaged combination two-stage gas heat / two-stage dx
cool units designed for commercial applications. Gas heat
sections are designed with Lennox' aluminized steel tube
heat exchangers ranging in size from 135,000 to 470,000
Btuh input. Units are designed for rooftop or side of building
installation with either bottom or horizontal discharge and
return air.
For commercial applications, the GCS16 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.
GCS16-1853 SHOWN
TABLE OF CONTENTS
Introduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications Pages 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Data Page 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Data Pages 11-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Resistance Data Pages 17-18. . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts Arrangement Pages 18-22. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I- APPLICATION Page 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II- UNIT COMPONENTS Pages 22-41. . . . . . . . . . . . . . . . . . . . . . . . .
Control Box Components Pages 22-25. . . . . . . . . . . . . . . . . . . . . .
Heating Components Pages 26-34. . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Components Pages 34-40. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Compartment Components Pages 40-41. . . . . . . . . . . . . .
III- ELECTRICAL CONNECTIONS Page 41. . . . . . . . . . . . . . . . . . . .
IV- PLACEMENT AND INSTALLATION Page 41. . . . . . . . . . . . . . .
V- START UP - OPERATION Pages 41-42. . . . . . . . . . . . . . . . . . . . .
Preliminary Checks Page 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling / Heating Start Up Pages 41-42. . . . . . . . . . . . . . . . . . . . . .
Safety or Emergency Shut Down Page 42. . . . . . . . . . . . . . . . .
VI- COOLING SYSTEM CHECKS Page 42. . . . . . . . . . . . . . . . . . . . .
Gauge Manifold Attachment Page 42. . . . . . . . . . . . . . . . . . . . . . .
Charging Page 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII- HEATIING SYSTEM SERVICE CHECKS Pages 42-46. . . . . . . .
A.G.A./C.G.A. Applications and Requirements Page 42-43. . . . .
Gas Piping Page 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Gas Piping Page 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Supply Pressure Page 43. . . . . . . . . . . . . . . . . . . . . . . . . .
Check and Adjust Manifold Pressure Page 43-44. . . . . . . . . . . . .
Proper Gas Flow Page 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Derate Pages 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inshot Burner Pages 44-45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Exchanger Page 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control Page 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrode Gap and Flame Sensing Pages 45-46. . . . . . . . . . . . .
Combustion Air Blower Page 46. . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII- INDOOR BLOWER OPERATION / ADJUSTMENT
Pages 46-47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Operation Page 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining Unit CFM Page 46. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Belt Adjustment Pages 46-47. . . . . . . . . . . . . . . . . . . . . . .
IX- MAINTENANCE Page 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters Page 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication Page 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Air Blower Wheel Page 47. . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator and Condenser Coil Page 47. . . . . . . . . . . . . . . . . . . .
Electrical Page 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X- ACCESSORIES Pages 48-63. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMF16 Roof Mounting Frame Page 48. . . . . . . . . . . . . . . . . . . . .
OAD16 Outdoor Air Damper Page 48. . . . . . . . . . . . . . . . . . . . . . .
Economizers Pages 48-54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transitions and Supply / Return Diffusers Page 54. . . . . . . . . . . .
Firestats Page 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cycle Control Kit Page 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Ambient Kit Page 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Panels Pages 56-57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commercial Controls Hardware Pages 58-59. . . . . . . . . . . . . . . .
Optional Commecial Controls Systems Pages 59-63. . . . . . . . . .
Clocks / Timers Page 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XI- WIRING DIAGRAMS / OPERATION SEQUENCE
Pages 64-79. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Operation Sequence Pages 64-75. . . . . . . . . . . . . . . . . . . . .
REMD16M Economizer Operation Sequence Pages 76-77. . . .
Warm Up Kit Operation Sequence Pages 78-79. . . . . . . . . . . . . .
