Lennox GCS16-2753-470

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. . . . . . . . . . . . . .
Библиотека СОК 

Lennox GCS16-2753-470 Specifications

General

Brand	Lennox
Model	GCS16-2753-470
Category	Gas Heater
Language	English

Summary

UNIT INFORMATION

GCS16 SERIES Overview

Overview of GCS16 series packaged combination two-stage gas heat/two-stage dx cool units.

I- APPLICATION

Details on unit applications and requirements for commercial applications.

II- UNIT COMPONENTS

Control Box Components

Description of control box components and their functions.

Heating Components

Description of heating system components.

Cooling Components

Description of cooling system components.

ELECTRICAL DATA

GCS16 Models 823, 953, 1353 & 1603 Electrical Specs

Electrical data for GCS16-823, -953, -1353, and -1603 models.

BLOWER PERFORMANCE DATA

GCS16-823 Blower Performance

Blower performance data for GCS16-823 units.

ACCESSORY AIR RESISTANCE

Total Resistance Data by Accessory Type

Air resistance data for various accessories with different unit models.

PARTS ARRANGEMENT

GCS16-823, -953 Parts Arrangement

Visual breakdown of components for GCS16-823 and GCS16-953.

GCS16-1353, -1603 Parts Arrangement

Visual breakdown of components for GCS16-1353 and GCS16-1603.

GCS16-1853 Parts Arrangement

Visual breakdown of components for GCS16-1853 models.

CONTROL BOX COMPONENTS

GCS16-823, -953 Control Box Components

Identification of components within the GCS16-823 and GCS16-953 control box.

II- UNIT COMPONENTS

A-Lifting Brackets

Information on the use and function of lifting brackets for unit installation.

HEAT EXCHANGER ASSEMBLY

UNITS EQUIPPED WITH SINGLE HEAT EXCHANGER

Diagram of a typical single heat exchanger assembly.

C-Heating Control Box Components

1-Transformer T3

Description of the autotransformer for combustion air blower.

N-Cooling Components

Summary of Features

Overview of the GCS16-1853 cooling circuits, compressors, coils, and fans.

Component Protection and Sensors

3-High Pressure Limit S4, S7 and S28

Function of high pressure limit switches for compressor protection.

III-ELECTRICAL CONNECTIONS

A-Power Supply

Information on power supply connections and voltage requirements.

IV-PLACEMENT AND INSTALLATION

Guidelines for unit placement and installation.

Operation Procedures

VI-COOLING SYSTEM SERVICE CHECKS

Procedures for checking the cooling system performance.

Heating System Service Checks

D-Testing Gas Supply Pressure

How to test gas supply pressure and acceptable ranges.

Burner and Ignition System

J-Ignition (Burner) Control A3

Details on the burner ignition control A3 operation and lockout.

Indoor Blower Operation

B-Determining Unit CFM

Methods for determining unit airflow (CFM) using static pressure.

IX-MAINTENANCE

A-Filters

Guidelines for checking, cleaning, or replacing air filters.

D-Evaporator Coil

Procedures for inspecting and cleaning the evaporator coil.

E-Condenser Coil

Procedures for cleaning and inspecting the condenser coil.

X-ACCESSORIES

C-Economizer

Overview of optional economizer dampers, enthalpy sensor, and controls.

Economizer Controls and Accessories

c-Warm Up Kit

Description of the warm-up kit for economizers and thermostats.

Low Ambient Kit and Status Panels

H-Low Ambient Kit (all units)

How the low ambient kit allows mechanical cooling at low outdoor temperatures.

J-Commercial Controls Hardware

1- Jack J2(opt. Plug P2)

Connection point for the heating section.

2- Jack J3 Plug P3

Connection point for economizers and relay kits.

Control System Wiring Diagrams

3- C1 Wiring Diagram

Wiring for standard thermostats without economizer or warm-up.

WIRING DIAGRAM AND OPERATING SEQUENCE

B1 diagram with C1 diagram GCS16-823 or -953 with basic standard thermostat

Wiring diagram and operating sequence for GCS16-823/-953 with standard thermostat.

C1 DIAGRAM WITH B1 DIAGRAM

Electromechanical Thermostat Connected to GCS16-823 or GCS16-953 (Without Economizer)

Operating sequence for GCS16-823/-953 with electromechanical thermostat.

C1 DIAGRAM WITH B2 DIAGRAM

Electromechanical Thermostat Connected to GCS16-1353 with basic standard thermostat

Wiring diagram for GCS16-1353 with standard thermostat.

C1 DIAGRAM WITH B2 DIAGRAM

Electromechanical Thermostat Connected to GCS16-1353 (Without Economizer)

Operating sequence for GCS16-1353 with electromechanical thermostat.

C1 DIAGRAM WITH B2 DIAGRAM

Electromechanical Thermostat Connected to GCS16-1603 with basic standard thermostat

Wiring diagram for GCS16-1603 with standard thermostat.

C1 DIAGRAM WITH B2 DIAGRAM

Electromechanical Thermostat Connected to GCS16-1603 (Without Economizer)

Operating sequence for GCS16-1603 with electromechanical thermostat.

B9 and A8 diagrams with C1 diagram

GCS16-1853 with basic standard thermostat

Wiring diagrams B9/A8 with C1 for GCS16-1853 and standard thermostat.

C1 DIAGRAM WITH B9 and A8 DIAGRAMS

Electromechanical Thermostat Connected to GCS16-1853 with 235,000 BTUH Input Heat (Without Economizer)

Operating sequence for GCS16-1853 with electromechanical thermostat and heating.

C1 DIAGRAM WITH B41 and A8 DIAGRAMS

Electromechanical Thermostat Connected to GCS16-2553, -2753 or -3003 with 235,000 BTUH Input Heat (Without Economizer)

Operating sequence for GCS16-2553/2753/3003 with thermostat and heating.

C1 DIAGRAM WITH B41 and A8 DIAGRAMS

Electromechanical Thermostat Connected to GCS16-2553, -2753 or -3003 with 470,000 BTUH Input Heat (Without Economizer)

Operating sequence for GCS16-2553/2753/3003 with thermostat and 470K BTUH heating.

C1 diagram with D5 diagram

electromechanical thermostat with modulating economizer

Wiring diagram for thermostat with modulating economizer.

C1 DIAGRAM WITH D5 DIAGRAM

Electromechanical Thermostat Connected to CHA16-1853 with Economizer and Warm-Up

Operation sequence for CHA16-1853 with economizer and warm-up kit.

C2-1 diagram with D5 diagram

electromechanical thermostat with modulating economizer and warm-up

Wiring diagram for thermostat with modulating economizer and warm-up.