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The exhaust fan dilutes the air in the main living spaces with outside air to
remove unavoidable contaminants from people, pets, cleaning, off gassing,
etc. The whole house fan ow rate is determined based on the oor space and
the number of bedrooms. The whole house fan provides multiple air exchanges
within the home each day. The operation can be continuous or intermittent
(much higher airow cycled by a timer) if 1 zone or less.
For more information about ASHRAE, go to https://www.ashrae.org.
Heat & Cool
This screen allows changes to how the system operates. Options are single
set-point, heat pump mode (normal or comfort), auxiliary heat and safety
protection.
Settings
1. Temp Hold: Option will only be available in non-zoning systems. This
option allows the user to control both heating and cooling temperatures
with one single temperature setting. Factory default is off (see the following
gure for screen example).
2:31 am
set−to
76
inside
57%
auto
0
modes /schedules
tue | Mar 31, 2015
Home
Figure 12. Temp Hold
NOTE: When set to Temp Hold, the Heat • Cool position indicator changes.
The blue color (cooling) indicator is on the left and heating (red)
indicator is on the right. This is just the opposite on how it is displayed
in normal Heat • Cool mode. Also the Heat • Cool mode indicator will
display Auto instead.
NOTE: Temp Hold is not compatible with Google Assistant. Google Assistant
will not be able to adjust your home temperature.
2. Select Heat Pump Mode: (only available with system using a heat pump).
Options are normal and comfort. Default is normal. Descriptions for what
each setting does is displayed on the screen.
3. Wider Set-Point Range: Changes the default low and high maximum
temperature setting from 60-90°F to 40-99°F (15.5 - 32.0°C to 4.5 - 37.0°C).
4. Balance Point Auxiliary Heat: (only on heat pump systems): An additional
heat source will be used automatically when the indoor temperature drops
to a temperature that can be adjusted using the slider temperature setting
tool.
5. Balance Point Auxiliary Heat: When the outdoor temperature is above
the high balance point, only the heat pump is allowed to run. When outdoor
temperatures are below the low balance point, only the auxiliary heat
source is allowed to run. When outdoor temperatures are between the
high and low balance points, then both the heat pump and auxiliary heat
source are allowed to run.
6. Safety Protection: Alerts you if the home gets too cold or hot. This is set
under this menu option on the setting for both low and high temperatures.
The system will automatically turn on either cooling or heating if the home’s
interior temperature reaches either the low or high setting. A notication
is also sent to the Home screen notication area and Comfort Sync A3
Thermostat App.
Auxiliary Heat Overview
Auxiliary heat is the use of an additional heat source, when the heat pump
BTU capacity is not sufcient to keep up with the home’s heating demand;
sometimes it is also called supplemental heat.
When used in a dual-fuel mode, auxiliary heating is accomplished with a gas
or oil red unit. In this mode of operation, the heat pump must shut down and
uses just the auxiliary heating unit for heating.
If the system is an air handler with electric heat, the auxiliary heat will be in
conjunction with the heat pump when the home heating requires it.
Another use of auxiliary heat with heat pump systems includes a setting called
balance point. Balance point puts temperature limits on when the heat pump
and electric heat work together or independently.
• When the outdoor temperature is above the default high balance point of
50°F (10°C) (default), only the heat pump will be allowed to run (no auxiliary
heat).
• When the outdoor temperature is below the default low balance point of 25°F
(-4.0°C) (default), only the auxiliary heat is allowed to run (no mechanical
heat pump operation).
• When the outdoor temperature is between the low and high balance point
settings both heat sources are allowed to satisfy the heating demand.
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