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SETTING
LOW HEAT LOCKOUT TEMPERATURE—Sets an outdoor air temperature below which low speed compressor
heating is locked out. Below the specified air temperature, all heating demands that use the compressor use high
speed compressor heating.
Range
•
OFF - Functionality disabled. Compressor heating always starts with first stage compressor Y1 and stages up to
second stage Y1 and Y/Y2 when the demand is sufficient and staging and cycle timer constraints have been
satisfied.
•
20° – 50°F - Outdoor temperature below which both the first and second stages of the compressor are
energized to satisfy all heating demands. This check is performed when the first stage of the compressor is
energized. If at the time the compressor is energized, the outdoor air temperature is less than or equal to the
LOW HEAT LOCKOUT TEMPERATURE, then the second stage of the compressor is energized also. When a
cycle starts under a low heat lockout condition, it will finish the heating cycle on high speed.
•
ON - The Y1 and Y/Y2 outputs are simultaneously energized to satisfy all compressor heating demands,
regardless of outdoor air temperature.
NOTES:
•
If there is no valid outdoor temperature and the LOW HEAT LOCKOUT is set to a temperature (not OFF or
ON), the message OUTDOOR N/A displays in the banner and the low heat lockout setting is ignored (acts as if
the setting is OFF).
•
If the system does not have a 2-stage heat pump, this selection is not available.
TIME BETWEEN FUEL TYPES (ELECTRIC TO GAS)—Sets a minimum amount of time that the system runs on
compressor heat before transitioning to the furnace.
Range - The minimum number of minutes the compressor is energized to satisfy a heating demand before
transitioning to gas heat.
NOTES:
•
This selection is only available if the HEATING EQUIPMENT is set to GAS and the COMPRESSOR is set to
HP.
•
The minimum number of minutes the compressor runs in heating before staging up to gas heat is the larger of
this setting and the STAGE DELAY setting.
CYCLES PER HOUR—Sets a maximum number of equipment cycles per hour. Based on selecting 2, 4, 6 or 8
cycles per hour, this timer is set to 30, 15, 10 or 8 minutes. This time must elapse from the start of one cycle before
another cycle can start.
The Range - The maximum number of times the equipment can turn on per hour.
NOTE: When the equipment is off and the user changes the setpoint to create a heating or cooling demand, the
cycles per hour requirement is ignored to provide a timely response to the user's request. The cycles per hour
limitation become active again when the Y1, Y2, W1 or W2 outputs transition from ON to OFF.
MAX HEAT SETPOINT—Sets a maximum heating setpoint. This is the maximum heat setpoint value that can be
used in the program schedule or when the user adjusts the setpoint to temporarily override the program schedule.
NOTE: This setting is not available if HEATING EQUIPMENT is set to NONE. (HEAT EQUIP = ELEC and HEAT
STAGES = 0)
MIN COOL SETPOINT—Sets a minimum cooling setpoint that can be used in the program schedule or when the
user adjusts the setpoint to temporarily override the program schedule.
NOTE: This setting is not available if the COMPRESSOR is set to NONE.
AUX HEAT LOCKOUT—Sets an outdoor temperature above which the AUX HEAT (W1 and W2) outputs are not
energized in HEAT mode.
If the selected mode is EMERGENCY HEAT, the auxiliary heat is allowed to turn on.
The auxiliary heat lockout is checked when there is sufficient demand to energize W1, but the output has not been
turned on. Once the output has been energized, it remains energized until the demand algorithm no longer requires
the capacity of the auxiliary heat, regardless of the value of the outdoor air temperature.
NOTES:
•
The AUX HEAT LOCKOUT functionality is not available (and is set to the OFF setting) with the OUTDOOR
EQUIPMENT TYPE of NONE or AC selected, because the AUX HEAT LOCKOUT functionality needs HP
heating to operate.
•
If the REMOTE SENSOR is set to something other than ODT, there is no outdoor air temperature being
provided by the server and AUX HEAT LOCKOUT is set to a temperature, the message OUTDOOR N/A is
displayed in the home and dormant screen banners to indicate an outdoor sensor is required but there is no
outdoor temperature information available.
•
In a dual fuel unit, the auxiliary heat lockout temperature is set to a value less than the heat pump lockout
temperature. This is to prevent the condition where the range of outdoor air temperatures between the auxiliary
heat lockout and the heat pump lockout temperature result in no equipment operation. Below the heat pump
lockout temperature, the air source attempts to turn on but the auxiliary heat lockout temperature prevents it
from doing so. If the auxiliary heat lockout temperature is changed so that it is less than the heat pump lockout
temperature, the heat pump lockout temperature is set equal to auxiliary heat lockout temperature value. This
change to the heat pump lockout temperature is not visible to the user while the auxiliary heat lockout
temperature is being changed.
Table 7 — Installer Setting Screen Options (cont)
16
DEFAULT/RANGE
D:
Off
R:
Off
20° to 50° F
On
D:
15 Minutes
R:
10, 15, 20, 25 Minutes
D:
4
R:
2, 4, 6, or 8
D:
88° F
R:
50° to 88° F
(1° F Increments)
D:
52° F
R:
52° to 55° F
(5° F Increments)
D:
Off
R:
Off
5° to 55° F
(5° F Increments)
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