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C12 DIAGRAM
Honeywell T7300 Thermostat without Economizer
6-C12 Section
The Honeywell T7300 programmable thermostat allows GCS16 units without economizer to
automatically setback or setup setpoints for unoccupied periods as well as control setpoints
more precisely than electromechanical thermostats.
NOTE - In order to understand how these optional controls affect the operation of the GCS16,
you must first understand how all GCS16 components work. Refer to the operation se
quence for basic unit operation.
NOTE - These thermostats have a builtin clock for controlling setback. Optional time clock
CMC3-1, night thermostat and night relay kit are not needed and are not compatible.
Operation Sequence:
1- The GCS16 with T7300 is designed so that the fan switch in the thermostat should be left in the
ON mode at all times. This allows the blower to be controlled by terminal G in the thermostat.
The blower operates continuously during occupied periods and intermittently during unoccu
pied periods.
2- During a heating demand when the building is not occupied, the blower is activated only when
a heating demand passes through relay K25 in the GCS16. During a cooling demand when the
building is not occupied, the blower is activated through terminal G in the thermostat.
3- Heating demand W1 directly energizes the heat section of the GCS16.
4- Cooling demand Y1 is routed through plug P3 to activate the cooling circuit of the GCS16 di
rectly.
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