8
Advanced setup options (ISU)
# ISU ISU Name ISU Options (factory defaults
in bold)
Notes
370 Heating Cycle Rate
(Cycles per hour)
1 - 12 This ISU allows you to limit 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 selected:
Hot Water Radiant Heat = 3 CPH; Hot Water
Radiant Floor Heat in A or AF mode = 1CPH; Hot
Water Radiant Floor Heat in F mode = 3CPH; Steam
= 1CPH
388 Minimum On Time
(Boiler short cycling
protection)
0 = Off
2 = 2min
5 = 5min
15 = 15min
This ISU allows you to set minimum on time to protect
equipment from short cycling.
425 Adaptive Intelligent
Recovery
0 = No
1 = Yes
Adaptive Intelligent Recovery (AIR) is a comfort
setting. Heating equipment will turn on earlier,
ensuring the indoor temperature will match the
setpoint at the scheduled time.
431 Maximum Heat
Setpoint
A/AF mode:
40 °F to 90 °F (90 °F);
4.5 °C to 32.0 °C (32.0 °C)
F mode:
40 °F to 99 °F (85 °F);
4.5 °C to 38.0 °C (29.5 °C)
The user cannot set the heating temperature above
this level. Air heating temperature in A/AF mode,
Floor heating temperature in F mode.
432 Minimum Heat
Setpoint
A/AF mode:
40 °F to 90 °F (50 °F);
4.5 °C to 32.0 °C (10 °C)
F mode:
40 °F to 99 °F (50 °F);
4.5 °C to 38.0 °C (10 °C)
The user cannot set the heating temperature below
this level. Air heating temperature in A/AF mode.
Floor heating temperature in F mode.
435 Keypad Lockout 0 = Off
1 = Partial
2 = Full
Unlocked: User has access to all thermostat settings.
Partially Locked: User can modify only temperature
settings.
Fully Locked: User cannot modify any settings.
Screen will be locked by default "1234" factory code
and cannot be changed.
500 Wired Indoor Air
Temperature Sensor
0 = No
1 = Yes
This ISU is only displayed if no Wired Floor
Temperature Sensor (ISU 129) is configured.
515 Wired Indoor Air
Temperature Sensor
Type
0 = 10k
1 = 20k
Choose resistance type of Wired Indoor Air
Temperature Sensor. This ISU is only displayed if
Wired Indoor Air Temperature Sensor (ISU 500) is
configured.
520 Which Indoor Air
Temperature Sensor
will be used for
TEMPERATURE
Control? (Multiple
Sensors are
Averaged)
1 = Thermostat Only
2 = Wired Only
3 = Average
You can choose what Air temperature source to
be used or you can ask thermostat to use both
thermostat and remote wired sensors for higher
accuracy of measurement. This ISU is only displayed
if Wired Indoor Air Temperature Sensor (ISU 500) is
configured.
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