12
S
FAN SPEED -- select Low, Med, High for all zones when G
terminal is energized.
S
SHUTDOWN -- shuts off fan and equipment when initiated.
This function is not intended for emergency fire shutdown. It
may be activated by a dry contact from an external device such
as a float switch or a relay. User selects whether the contact is
NC -- normally closed (default) or NO-- normally open. User
Interface displays SYSTEM MALFUNCTION on screen and
registers G terminal shutdown event in Last 10 System Events.
See Fig. 29.
Dehum Drain
Turns off the continuous fan at the end of cooling for five minutes,
in order to drain the indoor coil of water. The fan will only be
turned off if a dehumidify demand existed at the start of or during
the cooling cycle. Default is enabled.
Reheat Dehum
Enables electric heat to be used while Cool to Dehumidify is
running. This will allow the Cool to Dehumidify function to run
much longer, greatly improving humidity control in cooling mode.
Accumulated electrical energy used while reheating (in
kilowatt--hours) is shown on the Fan Coil Run Hours screen and
can be reset there. This is only available with fan coil systems.
Setup -- Heat Pump / AC
Cooling Lockout:
S
NONE (default)
S
45
_
F (7
_
C)
S
50
_
F (10
_
C)
S
55
_
F (13
_
C)
Outside temperature below which cooling will not be provided.
Low Ambient Cooling:
S
NO (default)
S
YES
Selecting
YES
will enable the low ambient cooling operation in
the outdoor unit. This setting is only available with communicating
outdoor units and with Cooling Lockout set to
NONE
. Low
ambient kits are not needed with communicating outdoor units.
For detailed sequence of operation, see outdoor unit installation
instruction.
Entered Size:
S
(dependent on indoor unit model)
Size of the outdoor unit entered during the start--up process. If the
outdoor unit is a communicating model, this value will not be
shown. This size can be changed here but is limited to sizes that the
indoor unit can handle.
Defrost Interval:
S
30 minutes
S
60 minutes
S
90 minutes
S
120 minutes (default)
S
Auto--Defrost interval optimized by outdoor control (default for
communicating HP)
Time interval at which defrost cycles can occur on a heat pump.
Lockout Temp:
S
Off (default)
S
+5 to 55
_
F (--15 to 18
_
C)
Locks out the heat pump from operating below the selected outside
temperature. Appears with a fan coil only. Must be below any
electric lockout temperature in Fan Coil Setup.
Quiet Shift
S
Off (default)
Turns on Quiet Shift function in 1--stage or 2--stage
communicating heat pumps.
High Cool Latch:
S
OFF (default)
S
ON (high cool stage on at all times, unzoned only)
S
80 to 110
_
F (27 to 43
_
C) (unzoned only)
S
DISABLE (disable use of high cool stage)
Outside temperature above which only the high speed (of a 2--stage
outdoor unit) will run when cooling. High Cool Latch setting of
On will not function in zoned systems.
High Heat Latch
S
OFF (default)
S
ON (high heat stage on at all times, unzoned only)
S
20 to 50
_
F (--7 to 10
_
C)
2--stage heat pump runs only high stage heating below a
selectable outdoor temperature. Selections from 20 to 50
_
F ( --7
to 10
_
C) are available in 5
_
increments. High Heat Latch setting
of On will not function in zoned systems.
S
DISABLE (disable use of high heat stage)
Max Heat RPM (Appears with variable capacity heat pump)
Clamps the operating speed of the heat pump to this maximum.
Used to reduce operating noise while in high heating capacity.
Reducing this value will reduce the heating capacity of the heat
pump.
Heat Pump Airflow (Capacity) Limiting
The following settings allow the installer to restrict the heat pump
within certain minimum and maximum airflows. These airflows
are converted to capacities.
The Min and Max limits are
determined by the equipment size. These settings are not the same
as the zoning airflow limits.
Min CFM (only appears with variable capacity heat pump)
Minimum CFM to run a variable capacity heat pump. This will
increase the minimum operating capacity of the heat pump.
Default value is the heat pump air flow for the lowest heat capacity.
Maximum CFM (only appears with variable capacity heat pump)
Maximum CFM to run a variable capacity heat pump This will
reduce the operating capacity of the heat pump. Default value is
the heat pump air flow for the highest heat capacity.
Defrost Fan Delay
Turns on the outdoor unit fan at the end of a defrost cycle for
approximately 12 seconds. This helps to reduce any nuisance
refrigerant noise caused by the switching reversing valve. This
setup is only available on communicating heat pumps
Brownout Disable
Turns off the high voltage brownout detection function in the
outdoor unit control.
Lo Air Multiplier
Adjusts the low airflow speed on non--communicating two--stage
units. Choose 0.65 for units with a Bristol compressor, choose 0.80
(default) for units with a Copeland scroll compressor.
Setup -- Hybrid Heat
HYBRID HEAT SETUP
FURNACE
LOCKOUT:
> 30 F
HEAT PUMP
LOCKOUT:
< 15 F
DEFROST W/FURNACE:
YES
< BACK
HP TO FURNACE
STAGE TIME:
15 MIN
OUTSIDE LOCKOUT TEMPS
A07030
Fig. 30 -- Hybrid Heat Setup
UIZ0
1
--
V
