Honeywell Prestige 2.0 IAQ Installation Instructions Manual page 4

ALERTS AND DELTA T DIAGNOSTICS WITH THE PRESTIGE® 2.0 IAQ THERMOSTAT
2. Select the terminals that are wired to the Discharge
and Return Air Sensors (terminals S1 and S2 at the
EIM).
IMPORTANT
Be sure to select the correct terminals for the
discharge and return air sensors. For example, if
the return air sensor is wired to S1, select S1
(see Fig. 9) for the return air sensor.
3. Select the Discharge and Return Air Sensor Type
(10K).
IMPORTANT
10K sensors must be used for Delta T
Diagnostics.
4. Turn on the Heat and Cool Delta T Diagnostics.
Default is On.
69-2678EFS—03
Fig. 9.
Fig. 10.
Fig. 11.
5. For Air-to-Air Heat Pumps, press the up/down
arrows to set the maximum time duration of a
defrost cycle. Default is 10 minutes. Delta T is not
monitored during a defrost cycle. Check the heat
pump documentation for the defrost cycle time.
6. When you have completed the Installer Setup, you
will be asked to finish setting up Diagnostics.
7. If you press Set Up Diagnostics, you will enter the
Equipment Test. See "Run a Test for Each Stage"
beginning on page 5.
8. If you press I'll do it later, you will be reminded to
finish setting up diagnostics the next time you exit
installer setup. You can also finish setting up
diagnostics by following the procedure in "If You
Decide to Set Up Diagnostics Later".
After Delta T Diagnostics Setup is complete, the
thermostat will detect typical failures such as no heating
or no cooling and performance related issues that are
typically caused by a dirty air filter, blocked registers, loss
of refrigerant, dirty a-coil, frozen a-coil, cracked heat
exchanger, dirty burners, etc.
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Fig. 12.
Fig. 13.
Fig. 14.