Carrier 48/50PM C16-28 T−58 Communicating Room Sensor, CCN Linkage Control, Thermidistat Control

Space Temperature Sensor Control − Direct Wired (T−55 or T−56 or T−59)

Wire accessory space temperature sensor(s) to the T-55 terminals on the field connection terminal board located at the unit control box. Refer to Field-Installed Accessories section for additional information.

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 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’s CCN communication 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−Installed Accessories section for additional information.

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 for heating mode to operate.

CCN Linkage Control

The CCN communication must be properly configured for the 48/50PG and 48/50PM 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 for heating mode to operate.

Installation of an accessory supply air temperature (SAT) sensor in the supply duct is recommended for Linkage applications. 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) sensor in the return duct and wired to the space sensor input is recommended 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 element number, bus number, and baud rate. Refer to the System Pilot’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, Configuration→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 humidity switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input

at LOW humidity, and the input is the Humidistat 1 terminal (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, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity. Humidistat 2 terminal is the 24 VAC source for dry contact and the Humidistat 1 terminal is the signal input.

NOTE: On units with Humidi-MiZer, the Humidistat terminals 1 and 2 are the same as the Fire Shutdown terminals 1 and 2 on a standard unit. See Fire Shutdown section.

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 terminal board (TB1/TB2). 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 1 is the 24vdc loop power and Terminal 4 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 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.

48/50PG and PM

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