Trane 824 Comfort Control Installation Manual page 35

Feature
Humidification
Installer Setup
Load Value
Lockouts
Reminder Screens
Restore
18-HD72D1-1
There are two options available for humidification:
• Indoor RH setpoint—this controls the humidifier based on the desired indoor humidity setpoint
(options from 10%–45%).
• Frost Control setpoint--The control references the outdoor temperature and indoor environment
to calculate the risk of frost or condensation on interior walls and windows. A scale of 0 to 10
allows for customized settings based on the insulation properties of the home. A higher number
may be selected for well insulated homes, whereas a lower number should be selected on poorly
insulated homes. A lower number should be utilized if condensation is observed.
There are two control options for enabling humidification:
• Humidification with an active call for heat.
• Humidification without an active call for heat (control energizes blower and humidifier).
• Blower speed can be adjusted when there is no active call for heat but a call for humidification
is present
Humidification is only available when in the heating mode (or in the auto mode when the last call
was for heating). A 60 second minimum blower off delay is enforced if "steam" humidification
is selected.
There are two categories for Installer Setup.
• Standard—this is the basic system settings such as heat pump or cooling only, single or multi stage,
compressor type, etc. This is the basic system set up that is self discovered in communicating
mode, but requires manual input when using a Relay Panel for 24 volt configurations.
• Advanced—this provides advanced configuration of the system such as cycles per hour, minimum
run times, humidification and dehumidification setpoints, blower delays and temperature lockouts
to name a few of the customizable features in this set up.
Load Value is a numerical representation of the needed capacity to satisfy the setpoint. Proportional
(distance from setpoint) error plus integral (time away from setpoint) error is used to calculate load
value.
System lockouts will disable a certain function of the system under specific outdoor temperatures:
• Compressor Heating Lockout – will lockout all compressor operation below a set outdoor
temperature (from 5°–70°). This value must be set lower than the auxiliary heat lockout.
• Auxiliary Heating Lockout – will lock out auxiliary heat stages above a set outdoor temperature
(from 40°–70°). This value must be set higher than the compressor heating lockout.
• Defrost Heater Balance Point for W1, W2 & W3 – will lock out specific auxiliary heat stages
when above a set outdoor temperature. (W1 setpoint is from 40°–55°, W2 & W3 setpoints are
from 5°–55°). This feature does not apply to dual fuel systems.
• Compressor Cooling First Stage Lockout – will lock out the first stage compressor above a set
outdoor temperature. (from 80°–120°)
• Compressor Heating First Stage Lockout – will lock out the first stage compressor below a set
outdoor temperature. (from 0°–50°)
• Furnace First Stage Heating Lockout – will lock out first stage furnace operation below a set
outdoor temperature. (from 15°–50°)
First stage lockouts are not available with zoning.
Reminders can be set for filters, UV lamps, humidifier pads, and various other service reminders.
There are three levels of restore:
• Restore from the Setting Screen – this restores all personal configurations, such as program
schedules and home screen customization to their default setting.
• Reset Advanced Options from the Install Set Up screen – this restores all the advanced set
up selections such as system lockouts, accessories, air flow and comfort options to their default
setting.
• Restore Factory Defaults – this restores the control to its "out of the box" condition. All settings
will be set to their factory default condition.
824 Programmable Comfort Control
Description
page 35