Bryant Preferredt Series Installation Instructions Manual page 30

Option 07 — Zoning
This selection should be set to On when the thermostat is to be used as part of a
zoning system. It is assumed that the zoning equipment will take care of time guard
and cycle timers. The minimum on time is still controlled by the thermostat.
Default is OF (off).
Option 08 — Auxiliary Heat Lockout Temperature
This selection is available on heat pump systems with a valid outdoor temperature
sensor connected. Available settings are: Off, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50,
55.
OF (off) - function is disabled. Auxiliary heat is allowed to operate whenever
sufficient demand for heat is available.
5 to 55_F (- 15 to 13_C) - Outdoor temperature above which the auxiliary heat is
not allowed to operate (unless MODE is set to Emergency Heat). If room
temperature falls below 45_F (7_C), the auxiliary heat will be allowed to turn on
and will continue to run until demand is satisfied.
Default is OF (off).
Option 10 — Reversing Valve
This selection is only available on heat pump systems. "O" terminal can be
configured to be energized in either heating mode or in cooling mode, depending
on heat pump operation. "O" is used to describe a heat pump system that energizes
its reversing valve in cooling. "B" is used to describe a heat pump system that
energized its reversing valve in heating.
H — Reversing valve output (O/W2/B) is energized when HEAT mode is selected.
C — Reversing valve output (O/W2/B) is energized when COOL mode is selected.
Default is C.
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