Bryant PREFERREDT A07045 - Manual (Page 29)

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OF (off) -- function is disabled. Auxiliary heat is allowed to operate whenever
sufficient demand for heat is available.
5--55_F -- Outdoor temperature above which the auxiliary heat is not allowed to
operate (unless MODE is set to Emergency Heat).
Default is OF (off).
Option 09 — Heat Pump Lockout Temperature
This selection is only available on Hybrid Heat systems. A Hybrid Heat system
is selected via the Option 1 Equipment Type configuration. Configurations
settings are: OF (off), 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55.
OF (off) — the heating cycle will always start with heat pump heating.
5--55_F — the outdoor temperature below which heat pump operation is not
allowed.
When emergency heat mode is selected only auxiliary heat will operate.
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.