Carrier /50HC 04-28, Controls, Start-Up, Operation And Troubleshooting, Page: 12 / 144

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The Unit Control Type configuration, Configura-
tion

UNIT

U.CTL , must be set to Space Sensor (3). The
jumper wire in the installer’s packet must be connected be-
tween R and W1 on TB for heating mode to operate.
T-58 Communicating Room Sensor
Install the T-58 communicating thermostat. Connect the CCN
communication bus from the T-58 to the CCN terminals on the
field connection terminal board located at the unit control box.
Configure the unit’s CCN communication element number, bus
number, and baud rate. Configure the T-58 sensor’s CCN com-
munication bus number and baud rate the same as the unit, while
the element number has to be different. Configure the T-58 to
send SPT to the unit’s element number. Refer to the Field-In-
stalled Accessories section page 86 for additional information.
The Unit Control Type configuration,
Configuration

UNIT

U.CTL , must be set to Space Sensor (3). The jump-
er wire in the installer’s packet must be connected between R
and W1 on TB for heating mode to operate.
CCN Linkage Control
The CCN communication must be properly configured for the
48/50HC units and all other devices. Linkage configuration is
automatically done by the supervisory CCN Linkage device.
The Unit Control Type configuration,
Configuration

UNIT

U.CTL must be set to Space Sensor (3). The jumper
wire in the installer’s packet must be connected between R and
W1 on TB for heating mode to operate.
Installation of an accessory supply air temperature (SAT) sen-
sor in the supply duct is recommended for Linkage applica-
tions. A supply duct SAT measurement is valid for heating
mode display, while the factory-standard internal SAT is not
valid for heating due to its location upstream of the heating
section. When installing the supply duct SAT, the heating mode
display is enabled by setting Configuration

HEAT

SAT.H
to ENBL.
Installation of an accessory return air temperature (RAT) sen-
sor in the return duct and wired to the space sensor input is rec-
ommended for Linkage applications. This will allow the unit to
continue to run if Linkage communication is lost.
System Pilot™ - Communication Space Sensor
Install the System Pilot and connect the CCN communication
bus from it to the unit’s CCN connection on the low voltage
terminal board. Configure the unit’s CCN communication ele-
ment number, bus number, and baud rate. Refer to the System
Pilot device’s installation instructions for configuring it to be
used as a space temperature and attaching it to a unit.
Thermidistat Control
The thermidistat is a thermostat and humidistat combined and
the inputs are provided on the field connection terminal board.
The unit control type configuration, Configura-
tion

UNIT

U.CTL , default value is for thermostat (2) so
there is no need to configure this item. The thermostat control
type configuration, Configuration

UNIT

T.CTL , selects
the unit response to the thermostat inputs above. The space hu-
midity switch configuration, Configuration

UNIT

RH.SW ,
identifies the normally open or normally closed status of this
input at HIGH humidity (only on Humidi-MiZer ® units).
Space Humidistat Control
For units with the factory Humidi-MiZer option, the humidistat
input is provided on the field connection terminal board. The
Space Humidity Switch configuration, Configura-
tion

UNIT

RH.SW , identifies the normally open or normal-
ly closed status of this input at HIGH humidity.
Relative Humidity Sensor Control
For units with the factory installed Humidi-MiZer option and the
economizer option (with the ECB-economizer control board),
the humidity sensor input is provided on the field connection ter-
minal board (TB). The sensor can be used in addition to or in-
stead of a humidistat or thermidistat. The RH Sensor on OAQ
Input configuration, Configuration

UNIT

RH.S=YES , iden-
tifies that the sensor is being used instead of an OAQ sensor. Ad-
just 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 Humidi-MiZer 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. (Default is 0.) Configure Con-
figuration

CCN

BAUD to desired code number for baud
rate (Default is 3 = 9600 baud).
Accessories
Below are quick configuration settings for field installed acces-
sories. 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 men-
tioned 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 configu-
rations should be satisfactory. If they need to be changed, addi-
tional 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 Configura-
tion

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 Configura-
tion

HEAT

HT.TY to a value of 2. The number of electric
heat stages must be configured by setting Configura-
tion

HEAT

N.HTR per the installed heater.
FIRE SHUTDOWN
If a fire shutdown or smoke detector accessory was field in-
stalled, the unit must be configured for it by setting Configura-
tion

UNIT

FS.SW to normally open (1) or normally closed
(2) when there is not a fire alarm. Normally open (1) is the pre-
ferred configuration.
OUTDOOR ENTHALPY
If an outdoor enthalpy accessory was field installed, the unit
must be configured for it by setting Configura-
tion

ECON

EN.SW , identifies the normally open or nor-
mally closed status of this input when the outdoor enthalpy is
low.
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.