Carrier 48/50PM C16-28 manual Carrier Accessory Kits, Two−Position Damper, Indoor Air Quality

Carrier Accessory Kits

There are specific accessory kits sold for various field installed accessories. These kits vary based on model, size, voltage, manufacture date, and duct orientation. Some of these kits include Economizer, Power Exhaust, and Electric Heat. Refer to the Controls Quick Set−Up section for configuration and more information on these accessories.

Two−Position Damper

The two-position outdoor air damper accessory usage depends on model size and return duct orientation. This accessory wires directly into the low voltage circuit for the indoor fan control. No other control configuration is needed.

Indoor Air Quality

The indoor air quality (IAQ) sensor (part no. 33ZCSENCO2) is a field-installed accessory which measures CO2 levels in the air. When installing this sensor, an ECB board must be installed and the unit must be configured for IAQ use by setting Configuration→AIR.Q→IA.CF to a value of 1, 2, or 3. See the Indoor Air Quality section for more information.

TB−2 . . . . . . . . . . 4−20mA Input

TB−3 . . . . . . . . . . Sensor Common

TB−R . . . . . . . . . 24vac Output

TB−C . . . . . . . . . Common (GND)

Outdoor Air Quality

The outdoor air quality (OAQ) sensor is a field-installed accessory that measures CO2 levels in the air. When installing this sensor, an ECB board must be installed and the unit must be configured for OAQ use by setting Configuration→AIR.Q→OA.CF to a value of 1 or 2. See the Indoor Air Quality section for more information.

TB−2 . . . . . . . . . . 4−20mA Input

TB−3 . . . . . . . . . . Sensor Common

TB−R . . . . . . . . . 24vac Output

TB−C . . . . . . . . . Common (GND)

Smoke Detectors

The smoke detectors are field-installed accessories. These detectors can detect smoke in either the return air (part no. CRSMKDET003A00) or supply and return air (part no. CRSMKSUP002A00). When installing either detector, the unit must be configured for fire shutdown by setting Configuration→UNIT→FS.SW to normally open (1) or normally closed (2).

TB−Fire Shutdown−1 . . . . . . . . . . . . . Dry Contact Source

TB−Fire Shutdown−2 . . . . . . . . . . . Discrete Input to Board TB−R . . . . . . . . . 24vac Output

TB−C . . . . . . . . . Common (GND)

NOTE: When a Humidi-Mizersystem is installed, the inputs to the fire shutdown are moved to the control harness. See the Third Party Control section for more information.

Filter Status

The filter status accessory (part no. CRSTATUS002B00) is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting Configuration→UNIT→FL.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration.

Filter status wires are pre−run in the unit harness and located near the switch installation location. Refer to the Filter Accessory installation instructions for more information.

Fan Status

The fan status accessory (part no. CRSTATUS003B00) is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be

configured for fan status by setting Configuration→UNIT→FN.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration.

Fan status wires are pre−run in the unit harness and located near the switch installation location. Refer to the Fan Accessory installation instructions for more information.

NOTE: The fan status terminals on TB1 are NOT to be used.

Enthalpy Sensors

The enthalpy accessories (part no. CRENTSNG002A00 and CRENTDIF002A00) are field-installed accessories. The first accessory (outdoor air only) determines when the enthalpy is low relative to a fixed reference. Adding the second accessory (return air) compares the enthalpy between the outdoor and return airstreams. In each case, the enthalpy 4 to 20 mA signals are converted to a switch output which is read by the ECB. When installing this accessory, the unit must be configured for

enthalpy-basedcontrolbysetting Configuration→ECON→EN.SW to normally open (1). See Fig. 26 and 27 for wiring details.

Normal status is an active switch which tells the control that enthalpy is LOW. The actual switch terminal LOW is normally closed. Refer to the Enthalpy Kit installation instructions for more information on the installation.

Return/Supply Air Temperature Sensor

The temperature sensor (part no. 33ZCSENSAT) is a field-installed accessory which may be installed on the common return air duct and/or the common supply air duct near the unit. The duct return air temperature (RAT) may be selected for display only if the space temperature offset (SPTO) is not used. When installing the sensor,

the unit must be configured by setting Configuration→UNIT→RAT.S to YES. Using a RAT will allow differential dry bulb control of the economizer. The duct supply air temperature (SAT) may be used to replace the SAT sensor that is internal to the unit. 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 unit must be configured by setting Configuration→UNIT→SAT.H to ENBL. A SAT sensor in the supply duct is the preferred configuration for systems with Carrier variable volume and temperature (VVT) accessory controls.

Space Humidistat

The Space Humidistat (part no. −−HL−−38MG−029) is a wall mounted device with an adjustable setpoint to control humidity levels. 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.

TB−HUMIDISTAT1 . . . . . . . . . . . . Discrete Input to Board TB−HUMIDISTAT2 . . . . . . . 24 VAC Dry Contact Source

NOTE: The humidistat terminals are only in use when the unit is equipped with the Humidi−MiZer factory option.

48/50PG and PM

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