Humidifier Operation; Recovery; Aggressive Recovery; Heating Aggressive Recovery - Trane TCONT824 Installation Manual

• Furnace Heating 1st Stage Lockout – Once enabled,
select an outdoor temperature which forces 2nd stage
furnace heating operation.
7.6

Humidifier Operation

The 824 has the ability to control a humidifier through the
normally open dry AUX Contacts on the Control Sub-base.
Humidification is only enabled while in heating mode of
operation. Control options are:
• RH Control – Dry contacts are closed anytime the
indoor humidity is less than the heating target relative
humidity.
• Frost Control – The 824 Control references the
outdoor temperature and structure integrity to offset
the heating target relative humidity. This helps to
limit the risk of frost or condensation from forming
on interior walls and windows. A scale of 1 to 10 is
provided based on the insulation properties and
expected leakage of the home (1=Leaky with poor
insulation, 10=Very Tight with good insulation). An
outdoor temperature sensor must be connected and
enabled for frost control to be available.
Frost Control Structure Integrity Scale
1 2 3 4
Leaky, Poor Insulation
The 824 Control can be setup to allow humidification
anytime in heating mode or only when actively heating.
The airflow during Humidifier-only is factory set to 100%
but can be adjusted between 35%-100% (this requires
a variable speed indoor blower with BK connected).
All humidifier control options are located in the
Installer Setup>Accessories Settings.
7.7

recovery

The 824 control utilizes a Stage Inhibit to limit equipment
staging. This inhibit can be defeated in the following two
manners.

7.7.1 Aggressive recovery

Disables stage inhibits in heating and cooling mode anytime
the setpoint is adjusted more than 2°F

7.7.2 Heating Aggressive recovery

Disable stage inhibit in heating mode only when the outdoor
temperature falls below the selected outdoor temperature
7.8

Ventilation Operation

The 824 has the ability to control a Ventilation system
through the normally open dry AUX Contacts on the 824
Control Sub-base. The blower is not interlocked on a call
for ventilation. The ventilation run time per hour can be
adjusted to meet ASHRAE 62.2 standards. A temperature
override can be set to prevent ventilation operation when
18-HD72D1-6
5 6 7 8 9
Average Good Insulation, Tight
the outdoor temperature exceeds the minimum or maximum
outdoor temperature selections. If outdoor temperature
overrides are enabled the user can select to accumulate
the missed ventilation run time. Options are below:
• Accumulate missed ventilation run time in 4
hour increments and make up when the outdoor
temperature is within the min/max settings.
• Accumulate missed ventilation run time in 24
hour increments and make up when the outdoor
temperature is within the min/max settings
• Accumulate missed ventilation run time in 4 hour
increments and make up at the end of 4 hour period.
• Accumulate missed ventilation run time in 24 hour
increments and make up at the end of 24 hour period.
All Ventilation control options are located in the
Installer Setup>Accessories Settings.
7.9

Warm Air Discharge

Enabling Warm Air Discharge with BK connected will
reduce the variable speed blower air flow by 20% when
in compressor heating operation. Warm Air Discharge
only applies to compressor heating and is disabled when
hydronic, fossil fuel or electric heat (including supplemental
heat) modes are activated. Warm Air Discharge can be
enabled in Installer Setup>Comfort Settings.

7.10 Wet Heat (Hydronic) Operation

A hot water coil can be applied to either a variable speed
10
or non-variable speed indoor unit. The hot water coil can
be the sole source of heat or used as auxiliary heat when
applied with a heat pump. When applied with a heat pump,
wet heat is considered auxiliary heat and will operate in-
conjunction with heat pump heat. Switching the system
mode to emergency heat would disable the heat pump and
cycle the wet heat only.
If applied with a variable speed air handler with BK
connected, the blower speed during wet heat only heating
will vary based on the system load value. The airflow will
range from 35% to 100% depending on the system load
value. When applied with a heat pump, the blower speed
during heat pump and wet heat operation will be the higher
of the two air flows. There are separate blower "On" and
"Off" delays for wet heat in the 824 Control.
The 824 Control is designed to operate forced air systems
and should not be applied to non-forced air systems (radiant
floors, radiators, etc...)
The hydronic heat blower delay options can be accessed
by navigating to Installer > Setup > Airflow Settings.
824 Programmable Wi-Fi Comfort Control
37