Honeywell Home THX9321 Prestige 2.0 Manual page 86

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THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
4. Turn on the Heat and Cool Delta T Diagnostics.
Default is On.
Fig. 152.
Fig. 153.
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.
Fig. 154.
68-0311—08
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IAQ WITH EIM
6. When you have completed Installer Setup (see
"Installer Options" beginning on page 21), 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 87.
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.
If You Decide to Set Up Diagnostics Later
When you are ready to set up diagnostics, follow these
steps:
1. From the Home screen, press MENU.
2. Scroll down and press Installer Options.
3. Enter the passcode and press Done (see Note).
NOTE: The passcode is the date code printed on the
4. Press Set Up Diagnostics.
5. Proceed to "Run a Test for Each Stage".
86
Fig. 155.
back of the thermostat or press
MENU > EQUIPMENT STATUS to find the
date code.
Fig. 156.