Honeywell Prestige 2.0 THX9421 Manual page 39

ISU Installer Setup
Number Name
1 to 12 CPH
3160 Backup Heat Cycles
Per Hour - Stage 2
1° F to 30° F
3170 Cooling Throttling
Range
0, 100 to 25,000 sec
3180 Cooling Integral
0, 100 to 25,000 sec
3190 Cooling Derivative
1° F to 30° F
3200 Heating Throttling
Range
THX9321 PRESTIGE
Table 4. Installer Setup (ISU) Table. (Continued)
Settings Default
Default varies
based on
heating
equipment type
selected
2° F
10,000 sec
0 sec
2° F
39
®
2.0 AND THX9421 PRESTIGE
Residential,
Commercial Requires
or Both EIM
Both 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
Commercial 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.
Commercial 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.
Commercial 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.
Commercial No The default Heating 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.
®
IAQ WITH EIM
Notes
68-0311—07