370
Heat 1 CPH
(Heating
cycle rate
stage 1)
1 – 12 CPH
This ISU is only displayed when Heat Stages is
set to 1 stage or more 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 recommended (default) cycle rate
settings are below for each heating equipment
type:
Standard Efficiency Gas Forced Air = 5 CPH;
High Efficiency Gas Forced Air =
3 CPH; Oil Forced Air = 5 CPH; Electric Forced
Air = 9 CPH; Fan Coil = 3 CPH; Hot Water
Radiant Heat = 3 CPH; Steam = 1 CPH.
371
Heat 2 CPH
(Heating
cycle rate
stage 2)
1 – 12 CPH
This ISU is only displayed when Heat Stages is
set to 2 stages. The recommended (default) cycle
rate settings are below for each heating
equipment type:
Standard Efficiency Gas Forced Air = 5 CPH;
High Efficiency Gas Forced Air = 3 CPH; Oil
Forced Air = 5 CPH; Electric Forced Air = 9
CPH; Fan Coil = 3 CPH; Hot
Water Radiant Heat = 3 CPH; Steam = 1 CPH.
375
Aux Heat
CPH
(Heating
cycle rate
Auxiliary
Heat)
1 – 12 CPH
This ISU is only displayed when ISU 200 = Heat
Pump and ISU 221=1. It is only displayed when
Auxiliary Heat is configured. The recommended
cycle rate settings are below for each heating
equipment type:
Standard Efficiency Gas Forced Air = 5 CPH;
High Efficiency Gas Forced Air = 3 CPH; Oil
Forced Air = 5 CPH; Electric Forced Air = 9
CPH.
Table 4.
#
ISU
ISU Name
ISU Options (defaults in
bold)
Notes
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