Honeywell PRESTIGE THX9321 - Manual (Page 29)

THX9321 PRESTIGE ® 2.0 AND THX9421 PRESTIGE ® IAQ WITH EIM
29 68-0311—02
2210 Backup Heat Fan
Operation
No Fan
Equipment Controls Fan
Thermostat Controls Fan Default varies
based on
previous
selections
Both No This ISU is only displayed for heat pumps
when ISU 2180 Backup Heat Type is Other.
Backup Heat Fan Operation:
Electric Forced Air: Thermostat Controls
Fan
Standard Efficiency Gas Forced Air:
Equipment Controls Fan
High Efficiency Gas Forced Air: Equipment
Controls Fan
Oil Forced Air: Equipment Controls Fan
Hot Water Fan Coil: Thermostat Controls
Fan
Hot Water Radiant Heat: Not Applicable
2220 A-L/A Terminal
Setup
None
Time Of Day
Economizer
Heat Pump Failure Indication None Commercial No This ISU is only displayed when ISU 1010
Application is Commercial.
Note: When the thermostat is setup for
Residential, the L/A terminal operates as
described under “Heat Pump Failure
Indication.” The L/A terminal requires no
setup for residential applications.
None: The A-L/A terminal is not used.
Time of Day: The A-L/A terminal is
energized during Occupied periods and
when the user overrides the temperature.
The terminal is de-energized during
Unoccupied periods and in Standby mode.
Economizer: The thermostat controls an
economizer module to provide ventilation
during Occupied periods and free cooling
when outdoor conditions are favorable. The
A-L/A terminal is energized during
Occupied periods and during a call for
cooling in Unoccupied periods. See
“Economizer and Time of Day (TOD)
Operation” beginning on page 126.
Notes: The economizer module determines
when outdoor conditions are favorable for
free cooling. Delta T Diagnostics is not
available when the thermostat is setup for
an Economizer.
Heat Pump Failure Indication: When 24
volts is detected on the L/A terminal
(compressor monitor), the thermostat
displays a message to alert the user when
the heat pump requires service. The L/A
terminal sends a continuous output to a
zone panel when the thermostat is set to
Emergency Heat mode. The zone panel will
not turn on the heat pump when a zone is
set to Emergency Heat mode.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes