Lennox GCS16 Series

Page 75
XIII-WIRING DIAGRAMS AND OPERATION SEQUENCE
The following section shows the wiring diagrams for all
units and all possible control systems. An operation se
quence is provided with each diagram.
How the diagrams are organized
The operation sequence of each unit is unique and inde
pendent of the control system. For example, a
GCS16-651-125 unit proceeds through a set operation
sequence after receiving a cooling demand regardless of
which thermostat control systems is installed.
Likewise, the operation sequence of each control system
is independent of the unit it is connected to. For example, a
W973 control processes a cooling demand in a set way re
gardless of whether it is connected to a singlephase,
threephase, singlestage or twostage unit.
To simplify this section of the manual, the operation se
quence of each unit is shown connected only to the sim
plest thermostat control (C1 - electromechanical thermo
stat). For instructional purposes, this allows the instructor
or student to concentrate on basic unit operation.
Operation sequence of the optional control systems can
be complex and more difficult to understand. For this rea
son, the unit diagram was omitted from the optional con
trol system diagrams in order to concentrate on basic con
trol system operation.
Why the diagrams are organized this way
It is imporatnt to remember, however, that it is not neces
sary to see the control system diagram and unit diagram
connected together in order to understand the operation
sequence or to troubleshoot the unit. This concept is easi
er to see once it is understood that the control system (op
eration sequence) and unit (operation sequence) are inde
pendent.
A complete diagram including the unit diagram, control
system diagram and unit accessory diagrams, can be
found stuck to the inside face of the unit control box access
panel. The diagrams should be affixed by the installer in a
manner that will allow the diagrams to be read in their com
plete form.
WIRING DIAGRAM INDEX
Introduction Page 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A- RESIDENTIAL THERMOSTAT SYSTEMS
and RESIDENTIAL UNITS Pages 76-81. . . . . . . . . . . . . . . . . . . .
Basic Thermostat GCS16R and GCS16H
C24 Diagram with B34 Diagram Pages 76-77. . . . . . . . . . . . . . . . .
Commercial Application GCS16H and 3-position Economizer
C19 Diagram with B34 Diagram and D8 Diagram Pages 78-79. .
Commercial Application GCS16H and Modulating Economizer
C19 Diagram with B34 Diagram and D5 Diagram Pages 80-81. .
B- COMMERCIAL THERMOSTAT SYSTEMS
and COMMERCIAL UNITS Pages 82-96. . . . . . . . . . . . . . . . . . . .
Single Phase Unit with Electromechanical Thermostat
C1 Diagram with B34 Diagram Pages 82-83. . . . . . . . . . . . . . . . . .
Three Phase Units with Electromechanical Thermostat
C1 Diagram with B35 or B36 Diagram Pages 84-86. . . . . . . . . . . .
Electromechanical Thermostat with 3-position Economizer
C1 Diagram with D8 Diagram Pages 87-88. . . . . . . . . . . . . . . . . . .
Electromechanical Thermostat with Modulating Economizer
C1 Diagram with D5 Diagram Pages 89-90. . . . . . . . . . . . . . . . . . .
Electromechanical Thermostat, 3-position Econ. and Warm-up
C2-1 Diagram with D8 Diagram Pages 91-92. . . . . . . . . . . . . . . . .
Electromechanical Thermostat, Modulating Econ. and Warm-up
C2-1 Diagram with D5 Diagram Pages 93-94. . . . . . . . . . . . . . . . .
Electromechanical Thermostat with Night-Kit
C11-1 Diagram Pages 95-96. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C- COMMERCIAL ELECTRONIC THERMOSTATS Pages 97-116.
Flexstat and Prostat
C3 Diagram / C5 Diagram Pages 97-98. . . . . . . . . . . . . . . . . . . . . .
Flexstat and Prostat with 3-position Economizer
C3 or C5 Diagram with D8 Diagram Pages 99-101. . . . . . . . . . . .
Flexstat and Prostat with Modulating Economizer
C3 or C5 Diagram with D5 Diagram Pages 102-104. . . . . . . . . . .
Flexstat/Prostat, 3-position Economizer and Warm-up
C4 or C6 Diagram with D8 Diagram Pages 105-107. . . . . . . . . . .
Flexstat/Prostat, Modulating Economizer and Warm-up
C4 or C6 Diagram with D5 Diagram Pages 108-110. . . . . . . . . . .
Honeywell T7300
C12 Diagram Pages 111-112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Honeywell T7300 with 3-position Economizer
C12 Diagram with D8 Diagram Pages 113-114. . . . . . . . . . . . . . . .
Honeywell T7300 with Modulating Economizer
C12 Diagram with D5 Diagram Pages 115-116. . . . . . . . . . . . . . . .
D- HONEYWELL W7400 CONTROL SYSTEM Pages 117-120. . . .
W7400 Control with 3-position Economizer
C7-3 Diagram with D8 Diagram Pages 117-118. . . . . . . . . . . . . . .
W7400 Control with Modulating Economizer
C7-3 Diagram with D5 Diagram Pages 119-120. . . . . . . . . . . . . . .
E- HONEYWELL W973 CONTROL SYSTEM Pages 121-134. . . . .
W973 Control
C8-1 Diagram Pages 121-122. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
W973 Control with 3-position Economizer
C8-1 Diagram with D8 Diagram Pages 123-125. . . . . . . . . . . . . . .
W973 Control with Modulating Economizer
C8-1 Diagram with D5 Diagram Pages 126-128. . . . . . . . . . . . . . .
W973 Control and 3-position Economizer with Warm-up
C14-1 Diagram with D8 Diagram Pages 129-131. . . . . . . . . . . . . .
W973 Control and Modulating Economizer with Warm-up
C14-1 Diagram with D5 Diagram Pages 132-134. . . . . . . . . . . . . .