Honeywell THX9321 Prestige 2.0 Product Data page 40

®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
ISU Installer Setup
Number Name
3160 Backup Heat Cycles
Per Hour - Stage 2
3170 Cooling Throttling
Range
3180 Cooling Integral
3190 Cooling Derivative
68-0311—02
Table 4. Installer Setup (ISU) Table. (Continued)
Settings
1 to 12 CPH
1° F to 30° F
0, 100 to 25,000 sec
0, 100 to 25,000 sec
®
IAQ WITH EIM
Residential,
Commercial
Default or Both
Default varies Both
based on
heating
equipment type
selected
2° F Commercial
10,000 sec Commercial
0 sec Commercial
40
Requires
EIM Notes
No ISU 3010 Temperature Control Options
must be set to Advanced to view or adjust
cycle rate.
This ISU is only displayed when ISU 2070
or 2130 Backup Heat Stages is set to 2
stages.
Cycle rate limits the maximum number of
times the system can cycle in a 1 hour
period measured at a 50% load. For
example, when set to 3 CPH, at a 50% load,
the most the system will cycle is 3 times
per hour (10 minutes on, 10 minutes off).
The system cycles less often when load
conditions are less than or greater than a
50% load. The thermostat automatically
defaults to the recommended cycle rate
based on the heating equipment type that is
used. You can change the cycle rate as
needed. Default for commonly used
systems are shown below.
Standard Efficiency Gas Forced Air = 5 CPH
High Efficiency Gas Forced Air = 3 CPH
Oil Forced Air = 5 CPH
Electric Forced Air = 9 CPH
Hot Water Fan Coil = 3 CPH
Hot Water Radiant Heat = 3 CPH
Geothermal Radiant Heat = 3 CPH
Steam = 1 CPH
Gravity = 1 CPH
No The default Cooling Throttling range is 2° F
(1.5° C) which is appropriate for most
applications. Do not change this setting
unless advised to do so by Honeywell
technical support.
The throttling range controls the cycling of
the system and helps to compensate for
load changes, equipment sizing and
thermostat mounting location.
No The default Cooling Integral is 10,000
seconds which is appropriate for most
applications. Do not change this setting
unless advised to do so by Honeywell
technical support.
The integral controls how much droop is
used.
No The default Cooling Derivative is 0 seconds
which is appropriate for most applications.
Do not change this setting unless advised
to do so by Honeywell technical support.
The derivative makes adjustments to the
algorithm for fast acting systems.