Lennox GCS16-2753-470

FIGURE 72
NIGHT KIT
P4
RELAY K11
Page 61
CAUTION
Do not connect a warm-up kit to a W7400 relay kit
or to a system using a T7300. Warm-up kit wiring
is not compatible with these control systems and
component damage will result. These control sys
tems have a warm-up feature built in. A warm-up
kit is not needed.
An economizer allows outside air to be used for cooling
when conditions are acceptable and permits a preset
amount of air exchange during all other unit operation.
Warm-up kit holds outdoor air dampers full closed dur
ing first heating demand after night setback (during
morning warm-up).
No wiring is required (see figures 70 and 71). The kit
plugs into the unit wiring harness between the unit
and economizer. Unit plug P3 is removed and dis
carded. Relay kit plug P8 connects to unit jack J3.
Relay kit jack J8 connects to economizer plug P4.
3- C1 Wiring Diagram
Standard 2heat/2cool thermostat for all units without
economizer or warm-up. All wiring connections are
made to the unit low voltage terminal strip.
4- C21 Wiring Diagram
Standard 2heat/2cool thermostat for all units with
economizer and warm-up. CMC3-1 clock and night
thermostat must be added for night setback. Night
relay must also be added to economizer for night set
back. The warm up kit plugsin" to the unit with plug
P8. Warm up kit jack J8 connects to unit jumper plug
P3 or economizer plug P4. The thermostat connects
to the unit's low voltage terminal strip.
5- C11-1 Wiring Diagram
Standard 2heat/2cool
thermostat for all units
without economizer or
warm-up. C11 Night Kit
adds a relay facilitating
night setback function
(see figure 72). CMC3-1
clock and night thermo
stat must also be added to make setback relay
functional.
WARNING
Connect only relay kits designed for this control
system. Relay kits designed for other control sys
tems are not compatible and control damage or
failure will result. For example, do not connect a
warm-up kit to this control system.
All wiring connections are made by jackplug connec
tions to the commercial controls harness in the unit
(see figures 73 and 74). Plug P4 in the economizer
connects to Jack J3 in the unit to make this connec
tion.
The night kit is used only with the C11 wiring diagram.
It cannot be used with any other control system op
tions or control damage will result. This system is de
signed for use with optional CMC3-1 time clock and
night thermostat.
Night (setback relay) kit allows GCS16 units without
REMD16M economizer to automatically set back"
the thermostat to reduce energy consumption during
times when the building is not occupied. The night kit
achieves this by disconnecting thermostat S1 and
connecting a night thermostat during periods when
the building is not occupied. The night thermostat can
then be adjusted with a lower setpoint as needed for
unoccupied heating.
FIGURE 73
J3
NIGHT KIT
PLUG P4
NIGHT KIT RELAY
NIGHT KIT INSTALLED IN FILTER
SECTION OF 12.5 TON AND SMALLER UNITS
FIGURE 74
J24
J3
J33
NIGHT KIT
PLUG P4
NIGHT KIT RELAY
NIGHT KIT INSTALLED IN FILTER
SECTION OF 15 TON AND LARGER UNITS