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C7735A1000 DISCHARGE AIR TEMPERATURE SENSOR
2. Drill a 1/4 in. hole in the duct at the location
selected for the sensor.
3. Remove the cover from the DATS case and insert
the probe into the hole drilled in step 2.
4. Secure the DATS to the side of the duct, through
the two mounting holes in the back of the case,
with the screws supplied.
IMPORTANT
Use normal 18-22 gauge thermostat wire for
shorter runs. For longer runs or when wiring
near voltage, use shielded cable.
5. Check the resistance across the sensor leads and
cross reference with Table 1.
6. Connect the two DATS wires, using the wire nuts
supplied, to wires that connect to the TL and TL
terminals on the TZ-3, MABS EZ-2, MABS EZ-4 or
to the ZMS and ZMS terminals on the EMM series
panels, through the wiring hole in the DATS case.
See Fig. 3.
7. Replace the cover on the DATS case.
8. Adjust the MAX Temp dial on the TZ-3 to the
appropriate high limit setting. This can be set
between 110°F and 160° F (43°C and 71°C). Note
TROUBLESHOOTING
When Zoning Panel LED is...
Flashing IDLE light five times on
initial power-up (TZ-3).
Flashing IDLE continuously (TZ-3).
Flashing system light (EMM-3).
Flashing purge light (EMM-3U).
Flashing HEAT light continuously.
Flashing COOL light continuously
See Table 1 for readings in resistance for each temperature to determine if the DATS is reading the correct
temperature. To obtain the correct resistance measurement, remove the two wires from the wire nuts and measure the
resistance across the two wires.
69-1521-2
It means...
No DATS is wired to the panel or
there is an open circuit.
A DATS failure or no sensor.
DATS has tripped on high temper-
ature limit and all stages of heating
are shut off.
DATS has tripped on low
temperature limit and all stages of
cooling are shut off.
2
that settings between the lines are approximate
settings. The cooling low limit is fixed at 40 °F
(4°C) on the TZ-3, Rev 2 and 3 panels. The TZ-3,
Rev 4 panel, can be set at either 40 °F (4°C) or
48 °F (9°C). See TZ-3 panel instructions for further
information.
9. Set the upper and lower limits on the EMM-3U
using DIP switches 5 and 6.
Fig. 3. DATS wiring to TZ-3 panel.
It is corrected when...
Circuit is closed. Note that the DATS
Sensor is optional and not required for the
TZ-3 to operate.
Unhook the loads and verify the resistance
using step 5 of the Installation instructions.
Reset because delivered air temperature
drops 10ºF (-12°C) from MAX Temp setting
on the TZ-3 panel. 2.5-minute minimum
wait required on EMM series panels.
Reset because delivered air temperature
rises 10ºF above fixed low temperature
setting of 40°F (4°C) on TZ-3, Rev 2 and 3
panels, or 40º and 48°F (4°C and 9°C) on
TZ-3, Rev 4 panels. 2.5-minute minimum
wait required on EMM series panels.
C7735A WITH
COVER REMOVED
ZONING PANEL
ZoneMAX
TL
TL
M14879
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