Space Humidistat Control; Relative Humidity Sensor Control; Ccn Communication; Accessories - Carrier 48LC 04 Controls, Start-Up, Operation And Troubleshooting

item. The thermostat
ConfigurationUNITT.CTL, selects the unit response to the
thermostat inputs above. See below for Space Humidity Switch.

Space Humidistat Control

The HUM terminal can be used on the Field Connection board when
the isolation relay is installed between the MBB and TB. The Space
Humidity Switch configuration, ConfigurationUNITRH.SW,
identifies the normally open or normally closed status of this input at
LOW humidity.

Relative Humidity Sensor Control

For units with the economizer option (with the ECB- -economizer
control board), the humidity sensor input is provided on the field
connection terminal board (TB). The sensor can be used in addition to
or instead of a humidistat or thermidistat. The RH Sensor on OAQ
Input configuration, ConfigurationUNITRH.S=YES, identifies
that the sensor is being used instead of an OAQ sensor. Adjust RH
setpoints as needed. Terminal LPWR is the 24vdc loop power and
Terminal SPRH is the 4- -20 mA signal input. Refer to the Field
Installed Accessories and Dehumidification Operation sections for
more information.

CCN Communication

Configure ConfigurationCCNCCN.A to desired element
number. (Default is 1.) Configure ConfigurationCCN CCN.B
to desired bus number.
ConfigurationCCNBAUD to desired code number for baud
rate (Default is 3 = 9600 baud).

Accessories

Below are quick configuration settings for field installed
accessories. If these accessories were installed by the factory, they
will already be configured. See the Field- -Installed Accessories
section, third party control, control connection tables, and CCN or
Display parameter tables for any accessories not mentioned below
and any additional information on accessories.
Economizer
If an Economizer accessory was field installed, the unit must be
configured for it by setting ConfigurationECONEC.EN to
YES. The default settings for the other economizer configurations
should be satisfactory. If they need to be changed, additional
information about these configuration settings can be found in the
Economizer section.
Power Exhaust
If a Power Exhaust accessory was field installed, the unit must be
configured for it by setting ConfigurationECONPE.EN to
ENBL. The default settings for the other power exhaust
configurations should be satisfactory. If they need to be changed,
additional information about these configurations can be found in
the Power Exhaust section.
Electric Heat
If an Electric Heat accessory was field installed, the unit must be
configured for it by setting ConfigurationHEATHT.TY to a
value of 2. The number of electric heat stages must be configured
by setting ConfigurationHEATN.HTR per the installed
heater.
Fire Shutdown
If a Fire Shutdown or Smoke Detector accessory was field
installed, the unit must be configured for it by setting
ConfigurationUNITFS.SW to normally open (1) or normally
closed (2) when there is not a fire alarm. Normally open (1) is the
preferred configuration.
Outdoor Enthalpy
If an Outdoor Enthalpy accessory was field installed, the unit must
be configured for it by setting ConfigurationECONEN.SW,
identifies the normally open or normally closed status of this input
when the outdoor enthalpy is low.
control type configuration,
(Default is 0.) Configure
IAQ Switch
If an IAQ Switch accessory was field installed, the unit must be
configured for it by setting ConfigurationAIR.QII.CF,
identifies the normally open or normally closed status of this input
when the indoor air quality value is low (good) and also selects the
unit response to this input.
NOTE: An IAQ switch cannot be used if an enthalpy switch is
already on this input.
IAQ Sensor
If a CO Sensor accessory was field installed, the unit must be
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configured for it by setting ConfigurationAIR.QIA.CF
selects the unit response to this input. Default conversion to 0 to
2000 ppm.
OAQ Sensor
If an Outdoor Air Quality Sensor accessory was field installed, the
unit must be configured for it by setting ConfigurationAIR.Q
OA.CF selects the unit response to this input. Default
conversion to 0 to 2000 ppm.
Fan Status
If a Fan Status accessory was field installed, the unit must be
configured for it by setting ConfigurationUNITFN.SW to
normally open (1) or normally closed (2). Normally open (1) is the
preferred configuration.
Filter Status
If a Filter Status accessory was field installed, the unit must be
configured for it by setting ConfigurationUNITFL.SW to
normally open (1) or normally closed (2). Normally open (1) is the
preferred configuration.

Programming Operating Schedules

The ComfortLink controls will accommodate up to eight different
schedules (Periods 1 through 8), and each schedule is assigned to
the desired days of the week. Each schedule includes an occupied
on and off time. As an example, to set an occupied schedule for 8
AM to 5 PM for Monday through Friday, the user would set days
Monday through Friday to ON for Period 1. Then the user would
configure the Period 1 Occupied From point to 08:00 and the
Period 1 Occupied To point to 17:00. To create a different weekend
schedule, the user would use Period 2 and set days Saturday and
Sunday to ON with the desired Occupied On and Off times.
NOTE: By default, the time schedule periods are programmed for
24 hours of occupied operation.
To create a schedule, perform the following procedure:
1. Scroll to the Configuration mode, and select CCN
CONFIGURATION (CCN). Scroll down to the Schedule
Number (ConfigurationCCNSCH.O=SCH.N).
password protection has been enabled, the user will be
prompted to enter the password before any new data is
accepted. SCH.N has a range of 0 to 99. The default value
is 1. A value of 0 is always occupied, and the unit will
control to its occupied set points. A value of 1 means the
unit will follow a local schedule, and a value of 65 to 99
means it will follow a CCN schedule. Schedules 2- -64 are
not used as the control only supports one internal/local
schedule. If one of the 2- -64 schedules is configured, then
the control will force the number back to 1. Make sure the
value is set to 1 to use a local schedule.
2. Enter the Time Clock mode. Scroll down to the LOCAL
TIME SCHEDULE (SCH.L) sub- -mode, and press
ENTER. Period 1 (PER.1) will be displayed.
3. Scroll down to the MON.1 point. This point indicates if
schedule 1 applies to Monday. Use the ENTER command
to go into Edit mode, and use the Up or Down key to
change the display to YES or NO. Scroll down through the
rest of the days and apply schedule 1 where desired. The
schedule can also be applied to a holiday.
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