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C7735A1000 DISCHARGE AIR TEMPERATURE SENSOR
69-1521-2 2
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
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.
TROUBLESHOOTING
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.
C7735A WITH
COVER REMOVED
TL
TL
ZoneMAX
ZONING PANEL
M14879
When Zoning Panel LED is... It means... It is corrected when...
Flashing IDLE light five times on
initial power-up (TZ-3).
No DATS is wired to the panel or
there is an open circuit.
Circuit is closed. Note that the DATS
Sensor is optional and not required for the
TZ-3 to operate.
Flashing IDLE continuously (TZ-3).
Flashing system light (EMM-3).
Flashing purge light (EMM-3U).
A DATS failure or no sensor. Unhook the loads and verify the resistance
using step 5 of the Installation instructions.
Flashing HEAT light continuously. DATS has tripped on high temper-
ature limit and all stages of heating
are shut off.
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.
Flashing COOL light continuously DATS has tripped on low
temperature limit and all stages of
cooling are shut off.
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.