#
ISU
ISU Name
ISU Options (defaults in
bold)
Notes
255
Aux Heat
Type
Electric, Gas/Oil (or Fossil
Forced Air)
This ISU is displayed only if ISU 200 is set to heat
pump AND if ISU 221 Aux/E heat stages = 1. Note:
Options of this ISU may vary depending on the
model of the thermostat.
256
EM Heat
Type
Electric, Gas/Oil (or Fossil
Forced Air)
This ISU is displayed only if ISU 200 is set to Heat
Pump AND if ISU 221 Aux/E heat stages = 1 AND
if ISU 253 is set to run AUX/E heat separately.
Note: This ISU may not be available at all on some
models.
260
Fossil Kit
Control
Thermostat, External (Fossil
Fuel Kit Controls Backup
Heat)
This ISU is displayed only if ISU 200 is set to Heat
Pump AND if ISU 221 Aux/E heat stages = 1, AND
if ISU 256 is set to Gas/Oil.
Note: This ISU available on TH6320 model only.
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