APPLICATION
The C7835A1009 Discharge Air Temperature Sensor
(DATS) is a duct-mounted temperature probe that
provides capacity control of heating and cooling
equipment. It is used only with Honeywell networked
zoning. Mounted in the supply air duct, the DATS senses
the delivered air temperature and cuts off the heating or
cooling when the delivered air temperature goes above
or below normal operating limits. The heating and cooling
limits are field-adjustable.The DATS also compares the
discharge air temperature to the room temperature and,
if out of tolerance, a heating or cooling alert is issued. In
normal operation, the heat and cool lights are off, and the
COM light blinks periodically with activity on the
Enviracom bus.
When either limit setting is reached, the heating or
cooling shuts off, and the LEDs operate according to
Table 1. The call still exists and heated or cooled air is
still being supplied to the calling zones. Once the
delivered air temperature drops ten degrees for heating,
or rises ten degrees for cooling, the heating or cooling
equipment is brought back on. The ten degree differential
provides adequate minimum time-off to avoid damaging
the equipment.
NOTE: When using 50 Hz power, cut Jumper W1.
The location of the DATS is critical; it should not be
placed in line-of-sight of the heat exchanger or cooling
coil because the DATS could activate prematurely. It
should also be located before the bypass damper, when
applicable. See Fig. 1 for dimensions.
The DATS requires only three wires. Normal 18-22
gauge thermostat wire is used.

IMPORTANT
Do not locate the DATS probe in a duct near the
heat exchanger or strip heat, which can cause
false temperature readings.

DATS Sensor Ohm Chart: