Lennox GCS16H-311-75

SERVICE
GCS16
UNIT
INFORMATION
Page 1
Corp. 8911L7 Litho U.S.A.
2-5 TON UNITS
GCS16 SERIES UNITS
2 THROUGH 5 TON UNITS
GCS16 series units in the 2-5 ton cooling size were
introduced in the summer of 1989. The units are packaged
combination gas heat / dx cool units designed for both resi
dential and commercial applications. Gas heat sections
are available with Lennox' helical heat exchanger in
50,000 , 75,000 , 100,000 and 125,000 Btuh input sizes.
Units are designed for rooftop or side of building installa
tion with either bottom or horizontal discharge.
For commercial applications, the GCS16 is designed to
accept any of several different thermostat control systems
with minimum field wiring. Control options such as econo
mizer, warm up kit, Honeywell W973 control or Honeywell
W7400 control connect to the unit with jackplugs. When
plugged in the controls become an integral part of the unit
wiring. Commercial units are also equipped with a low volt
age terminal strip to facilitate thermostat field wiring.
All specifications in this manual are subject to change.
TABLE OF CONTENTS
Introduction Page 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications Pages 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower / Air Resistance Data Pages 5-9. . . . . . . . . . . . . . . . . . . . .
Parts Arrangement Pages 10-11. . . . . . . . . . . . . . . . . . . . . . . . . . . .
I- APPLICATION Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II- UNIT COMPONENTS Page 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control Box Components Pages 11-14. . . . . . . . . . . . . . . . . . . . . .
Heating Components Pages 15-22. . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling Components Pages 23-28. . . . . . . . . . . . . . . . . . . . . . . . . .
III- PLACEMENT AND INSTALLATION Page 28. . . . . . . . . . . . . . . .
IV- ELECTRICAL CONNECTIONS Page 28. . . . . . . . . . . . . . . . . . . .
V- START UP - OPERATION Page 28. . . . . . . . . . . . . . . . . . . . . . . . .
Preliminary Checks Page 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling / Heating Start Up Page 29. . . . . . . . . . . . . . . . . . . . . . . . .
Safety or Emergency Shut Down Page 29. . . . . . . . . . . . . . . . . .
Extended Period Shut Down Page 29. . . . . . . . . . . . . . . . . . . . . . . .
VI- REFRIGERATION SYSTEM CHECKS Page 29. . . . . . . . . . . . . .
Gauge Manifold Attachment Page 29. . . . . . . . . . . . . . . . . . . . . . . .
Charging Pages 29-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VII- HEATIING SYSTEM SERVICE CHECKS Page 31. . . . . . . . . . . .
A.G.A./C.G.A. Applications and Requirements Page 31. . . . . . . . .
Gas Piping Page 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing Gas Piping and Supply Pressure Page 31. . . . . . . . . . . . .
Check and Adjust Manifold Pressure Page 31. . . . . . . . . . . . . . . . .
Proper Gas Flow Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Derate Page 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inshot Burner and Burner Cone Pages 32-33. . . . . . . . . . . . . . . . .
Burner Plate Gasket Page 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Exchanger Page 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition Control Page 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrode Gap and Flame Sensing Page 35. . . . . . . . . . . . . . . . . .
Combustion Air Blower Page 35. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower / Limit Control Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VIII- INDOOR BLOWER OPERATION / ADJUSTMENT
Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Operation Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Determining Unit CFM Page 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Speed Adjustment 208/230V Pages 36-37. . . . . . . . . . . . .
Blower Speed Adjustment 460V and 575V Page 38. . . . . . . . . . . .
IX- MAINTENANCE Page 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubrication Page 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters Page 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heat Exchanger and Burner Page 39. . . . . . . . . . . . . . . . . . . . . . . .
Combustion Air Blower and Flue Pages 39-40. . . . . . . . . . . . . . . .
Evaporator and Condenser Coil Page 40. . . . . . . . . . . . . . . . . . . . .
Electrical Page 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
X- ELECTRICAL CONNECTIONS Page 40. . . . . . . . . . . . . . . . . . . .
Power Supply and Field Wiring Page 40. . . . . . . . . . . . . . . . . . . . .
XI- ACCESSORIES Page 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lifting Lug Kit Page 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMF16 Roof Mounting Frame Page 42. . . . . . . . . . . . . . . . . . . . . .
Economizers Pages 42-49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RDE16-41 Duct Enclosure Pages 49-51. . . . . . . . . . . . . . . . . . . . .
OAD16 Outdoor Air Damper Page 51. . . . . . . . . . . . . . . . . . . . . . . .
L.P.G. Kit Pages 52-53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser Coil Guard Kit Page 53. . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Kit Page 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Crankcase Heater Page 54. . . . . . . . . . . . . . . . . . . . .
Downflow Filter Kit Page 54. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timed-Off Control Kit Pages 54-55. . . . . . . . . . . . . . . . . . . . . . . . . .
Compressor Monitor Page 55. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Ambient Kit Pages 55-56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Roof Curb Power Kit Page 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firestats Page 57. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transitions and Supply / Return Diffusers Page 58. . . . . . . . . . . . .
Status Panels Pages 58-64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Commercial Controls Hardware Page 65. . . . . . . . . . . . . . . . . . . . .
Commercial Controls Systems Pages 65-67. . . . . . . . . . . . . . . . . .
Controls Mounting Box and Bracket Pages 67-78. . . . . . . . . . . . .
Clocks / Timers Page 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
XII- COMMERCIAL CONTROLS INSTALLATION Page 69. . . . . . . .
Night Kit and Night Relay Page 69. . . . . . . . . . . . . . . . . . . . . . . . . .
W7400 Control System Pages 70-71. . . . . . . . . . . . . . . . . . . . . . . .
Warm-Up Kit Page 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W973 Control System Pages 73-74. . . . . . . . . . . . . . . . . . . . . . . . .
XIV- WIRING DIAGRAMS / OPERATION SEQUENCE
Index and Introduction Page 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagrams and Operation Sequence Pages 76-134. . . . . . . . . . . . .
Библиотека СОК 

Lennox GCS16H-311-75 Specifications

General

Efficiency	80% AFUE
Input Voltage	115V
Weight	130 lbs
Stages	Single Stage
Heating Capacity	75, 000 BTUH
Gas Type	Natural Gas

Summary

II-UNIT COMPONENTS

A-Control Box Components

Details the components found within the control box of the GCS16 unit.

1-Heat Exchanger

2-Burner Assembly

4-Blower Lower Limit Control

Covers the blower and lower limit control, including their functions and specific models.

6-Flame Rollout Switch S47

7-Combustion Prove Air Switch S18

8-Combustion Air Blower B6

Explains the combustion air blower's operation, function, and specifications.

13-Electrode Assembly

14-Ignition Control A3

C-Cooling Components

Describes the cooling system components, including evaporator and condenser coils.

1-Compressor B1

Details the compressor, its specifications, and safety features like overload protection.

3-Loss of Charge Switch S24

Explains the loss of charge switch, its function, and reset procedure for system protection.

7-Compressor Fan and Motor

Describes the specifications and operation of the compressor fan and motor.

9-Blower Motor B3

Explains the blower motor, its speeds, and power specifications.

III. PLACEMENT AND INSTALLATION

A. Power Supply

Outlines requirements for power supply connections and safety precautions.

V-START-UP

Details the procedures for initial unit start-up and checks.

V. REFRIGERATION SYSTEM SERVICE CHECKS

A. Gauge Manifold Attachment

B. Charging

Covers refrigerant charging procedures and considerations.

C. Checking Charge All Units

Details methods for checking refrigerant charge across all unit models.

VII. GAS SUPPLY

B-Gas Piping

C-Testing Gas Piping

Explains procedures for testing gas piping for leaks and integrity.

D-Testing Gas Supply Pressure

E-Check and Adjust Manifold Pressure

VIII. INDOOR BLOWER OPERATION ADJUSTMENT

A-Blower Operation

B-Determining Unit CFM

IX. MAINTENANCE

A-Lubrication

B-Filters

C-Heat Exchanger

D-Burner

XII. WIRING DIAGRAMS AND OPERATION SEQUENCE