Lennox GCS16-1853-235

FIGURE 77
CMC3-1 TIME CLOCK FIELD WIRING
120V
120V
TO TB1 TERMINAL 6*
TO TB1 TERMINAL 11
LINE
FRONT TERMINALS
TIME CLOCK
REAR TERMINALS
12 3
13
*IF SSP11 IS USED CONNECT
TO SSP11 TERMINAL 20
Page 63
The W973 is used only with the C81 and C141 wiring
diagrams. It cannot be used with any other control sys
tem options or control damage will result.
The Honeywell W973 control, when added to a
GCS16, allows use of electronic ramping" thermo
stats, discharge temperature sensors, return air tem
perature sensors and/or remote thermostats and
transmitters. The W973 control system is designed
for use with Honeywell T7067 electronic ramping"
thermostat and Q667 subbase.
An interconnecting W973 relay kit must be used to
adapt the W973 to the GCS16. Optional CMC3-1
time clock must also be used for night setback capa
bilities. The relay kit changes the thermostat set
points for night setback. A night thermostat is not
needed.
12- C14-1 Wiring Diagram
W973 control system for units with economizer and
warm-up. Requires W973 relay kit. Also requires
CMC3-1 clock and night relay for night setback. Wir
ing connections are similar to C81 diagram except
with addition of warm up kit. Warm up kit plug P8 con
nects to W973 relay Kit jack J5 and all other jackplug
connections are made as described in previous sec
tions. Room temperature sensor connections are
made to the unit's low voltage terminal strip.
13- C12 Wiring Diagram
T7300 electronic thermostat for units without econo
mizer. T7300 thermostat wiring connections are made
to the unit's low voltage terminal strip.
14- C12-2 Wiring Diagram
T7300 electronic thermostat for units with economiz
er. Warm-up is built in.
L-Clocks / Timers (CMC3-1)
Two optional clocks (both designated model# CMC3-1)
are available for use with either the electromechanical
thermostat or the Honeywell W973 control system. Both
allow mechanical thermostats to set back" during unoccu
pied periods. The clocks, models 202A and 702A, allow
24hour and 7day programmability respectively.
Other CHA16 control system options (W7400, T7300,
Pro-stat, etc.) are equipped with builtin clocks for this pur
pose and do not need CMC3-1.
Both CMC3-1 clocks are alike except for programmability.
The clocks are rated 24VAC*, 60Hz and have SPDT con
tacts rated at 15A and 120VAC.
*NOTE-Some clocks may be 120VAC while most are
24VAC. Be sure to check clock motor rating and wire
clock according to its rating.
Wiring connections
should be made to
N.O. terminal 1 and 3
(see figure 77). Refer
to the sequence of
operation for the con
trol system being
used (back of this
manual) for correct
wiring connections.
Refer to the manufac
turer's operation and installation instructions printed inside
the front cover of each clock.