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APPLICATION
The C7735A1000 Discharge Air Temperature Sensor
(DATS) is a duct-mounted temperature probe that
provides capacity control of heating and cooling
equipment. The DATS is used only with zoning solutions,
including TZ-3, MABS EZ-2 and MABS EZ-4, and EMM-
3 and EMM-3U control panels. 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.
When either limit setting is reached, the appropriate heat
or cool light emitting diode (LED) flashes on the TZ-3 or
EMM series panels, indicating that heating or cooling is
shut off. 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. EMM series has a 2.5 minute
timer as equipment protection.
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. DATS dimensions are shown in Fig. 1.
The DATS requires only two wires. Normal 18 to 22
gauge thermostat wire is used for shorter runs. For
longer runs or when wiring near voltage, shielded cable
is used.
4-1/8 (102)
3-7/8
(77)
Fig. 1. C7735A dimensions in in. (mm).
® U.S. Registered Trademark
Copyright © 2001 Honeywell •
C7735A1000 Discharge Air
1-1/4
(25)
3-3/4
(77)
M14926
• All Rights Reserved
Temperature Sensor
INSTALLATION INSTRUCTIONS
INSTALLATION
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
IMPORTANT
Do not locate the DATS probe in a duct near the
heat exchanger or strip heat, which can cause
false temperature readings.
1. Locate the DATS on the supply trunk between the
bypass damper and the evaporator coil and/or heat
exchanger. If a bypass damper is not used, locate
the DATS between the zone dampers and the
evaporator coil and/or heat exchanger. See Fig. 2.
BY PASS DAMPER
PLACE SENSOR
INTHIS AREA.
Fig. 2. DATS mounting location.
ZONE DAMPERS
DO NOT
EVAPORATOR COIL
PLACE
SENSOR IN
THIS AREA.
HEAT EXCHANGER
BLOWER
M14877
69- 1521- 2
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Summary of Contents for Honeywell C7735A1000
- Page 1 C7735A1000 Discharge Air Temperature Sensor INSTALLATION INSTRUCTIONS APPLICATION INSTALLATION The C7735A1000 Discharge Air Temperature Sensor When Installing this Product... (DATS) is a duct-mounted temperature probe that provides capacity control of heating and cooling 1. Read these instructions carefully. Failure to follow equipment.
- Page 2 C7735A1000 DISCHARGE AIR TEMPERATURE SENSOR 2. Drill a 1/4 in. hole in the duct at the location that settings between the lines are approximate selected for the sensor. settings. The cooling low limit is fixed at 40 °F 3. Remove the cover from the DATS case and insert (4°C) on the TZ-3, Rev 2 and 3 panels.
- Page 3 C7735A1000 DISCHARGE AIR TEMPERATURE SENSOR Table 1. DATS Resistance Cross Reference. Temperature (°F) Resistance Temperature (°F) Resistance 33630 3915 32668 3830 31737 3747 30835 3666 29962 3587 29117 3510 28298 3435 27505 3362 26737 3290 25993 3221 25272 3153 24573...
- Page 4 C7735A1000 DISCHARGE AIR TEMPERATURE SENSOR Table 1. DATS Resistance Cross Reference. (Continued) Temperature (°F) Resistance Temperature (°F) Resistance 9281 1466 9055 1438 8835 1411 8621 1385 8412 1359 8210 1334 8013 1309 7821 1285 7634 1261 7453 1238 7276 1215...