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J-Commercial Controls Hardware
All GCS16 units are factory equipped with the hardware
required to connect and operate Lennox' Commercial
Controls (W973, W7400, economizer, warm-up, etc...).
The hardware consists of an economizer wiring harness, a
control system wiring harness and associated jackplugs.
The economizer and control harnesses are pre-wired to
facilitate economizer, controls and/or warm-up connec
tions.
Each unit is equipped with marked jackplugs at various
locations throughout the unit. Each jack is marked with a J"
number on the jack (for example J5) and a corresponding
P" number on the plug (for example P5). The J16/P16 jack
plug and the J3/P3 jackplug are used as connection points
for commercial control systems in all Lennox commercial
equipment. Lennox supplied control systems are supplied
prewired with plugs which match the corresponding jack
plugs in the unit.
Following is a list of important jackplugs found in Lennox
commercial equipment and the function of each:
1- Jack J2 / (opt. Plug P2)
Jack J2 is located in the heating section of the unit
and is wired to the unit wiring harness. It is used for
the connection of the heating section. GCS16 and
CHA16 units are identical on the J2 side of the har
ness.
The matching plug P2 is located in the heating con
trol box (if unit is furnished with a heating section).
The only difference between GCS16 (gas heating)
units and CHA16 (electric heating) units is the wiring
on the P2 side of the harness (see unit wiring dia
grams).
In GCS16 equipment 12.5 tons and smaller, the gas
heating section is considered an integral part of the
unit. Jackplugs are not included between the unit and
the heating section.
2- Jack J3 / Plug P3
Jack J3 is located in the unit filter section of all units. It
is wired to the unit wiring harness and is used for the
connection of an economizer or any of the relay kits
which are used to interface optional controls to the
unit.
The mating plug P3 is a jumper plug which is neces
sary to complete circuits internal to the unit when the
unit is operated without accessories. When the unit is
operated with accessories, P3 is removed and dis
carded.
3- Jack J16 / Plug P16
Jackplug J16/P16 is located in the unit control box.
Jackplug J16/P16 is used exclusively as a connec
tion point for the control portion of optional control
systems. Plug P16 is wired to the unit low voltage ter
minal strip and jack J16 is wired to the unit wiring har
ness.
4- Jack J18 / Plug P18
(used in 15 ton and larger units only)
Jackplug J18/P18 is used as an extension harness
to connect power exhaust damper fans in the econo
mizer to the PED16 relay kit located in the unit filter
section.
5- Jack J24 / (opt. Plug P24)
(used in 15 ton and larger units only)
Jack J24 is located in the filter section. It is wired to
the unit wiring harness and is used for the connection
of an optional power exhaust damper (PED16) con
trol kit.
The matching plug P24 is located in the optional
PED16 control kit. The PED16 control kit installs in
the filter access area of the unit.
6- Jack J25 / (opt. Plug P25)
(used in 15 ton and larger units only)
Jack J25 is located in the unit control box. It is wired to
the unit wiring harness and is used for the connection of
an optional SP11 or SSP11 status panel.
The matching plug P25 is located in the optional sta
tus panel relay kit.
7- Jack J33 / (opt. Plug P34)
(used in 15 ton and larger units only)
Jack J33 is located in the heating section of the unit
and is wired to the unit wiring harness. It is used for
the connection of an optional third stage (W3) heating
relay.
The matching plug P34 is provided in the optional
third stage heating relay kit.
8- Jack J35 / Plug P35
(used in 12.5 ton and smaller units only)
Jackplug J35/P35 is located in the unit control box
is used for assembly line tests only. J35/P35 is not
used for the connection of any control or control sys
tem.
9- Jack J36 / Plug P36
(used in 15 ton and larger units only)
Jackplug J36/P36 is located in the unit control box is
used for assembly line tests only. J36/P36 is not used
for the connection of any control or control system.
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