Honeywell PRESTIGE THX9321 User Manual
Page 43
THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ WITH EIM
43
68-0311—02
4050
Outdoor
Temperature used
with Minimum Heat
Recovery Ramp
Rate
Off
-20° F to 100°F
0° F
Commercial No
Off: The heating system will begin recovery
at the time that is scheduled.
When a Minimum Recovery Ramp Rate is
set, the thermostat will begin recovery
early to ensure the temperature is reached
at the scheduled time.
Set a Minimum Recovery Ramp Rate
based on the rate that the heating system
can recover at for a cold day in your region.
Default setting is 5° F / hour.
If an outdoor sensor is installed, set an
Outdoor Temperature that is representative
of a cold day in your region to be
associated with the Minimum Recovery
Ramp Rate. The thermostat will begin
recovery at the optimal time based on a
calculated ramp rate, allowing the system
to recover on time and save energy during
changing outdoor conditions.
During recovery, the setpoint changes at a
rate in degrees per hour depending on the
outdoor temperature. If there is no outdoor
sensor, the Minimum Recovery Ramp
Rate is used.
4060
Maximum Heat
Recovery Ramp
Rate
Off
1° F/hr to 20° F/hr
8° F/hr
Commercial No
Off: The heating system will begin recovery
at the time that is scheduled.
When a Maximum Recovery Ramp Rate is
set, the thermostat will begin recovery
early to ensure the temperature is reached
at the scheduled time.
Set a Maximum Recovery Ramp Rate
based on the rate that the heating system
can recover at for a mild day in your region.
Default setting is 8° F / hour.
Set an Outdoor Temperature that is
representative of a mild day in your region
to be associated with the Maximum
Recovery Ramp Rate. The thermostat will
begin recovery at the optimal time based
on a calculated ramp rate, allowing the
system to recover on time and save energy
during changing outdoor conditions.
During recovery, the setpoint changes at a
rate in degrees per hour depending on the
outdoor temperature.
Table 4. Installer Setup (ISU) Table. (Continued)
ISU
Number
Installer Setup
Name
Settings
Default
Residential,
Commercial
or Both
Requires
EIM
Notes