Carrier 50HCQA Installation Manual download pdf (Page 74)

Outdoor Air Quality

The outdoor air quality (OAQ) sensor is a field-installed accessory

that measures CO

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 or TB B--SARH 4--20mA Input......

TB or TB B--COM Sensor Common

TB or TB B--R--2 24vac Output

TB or TB B--C--2 Common (GND)

Smoke Detectors

The smoke detectors are field-installed accessories. These detectors

can detect smoke in either the return air or supply and return air.

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 or TB A--FDWM Discrete Input to Board.....

Filter Status

The filter status accessory 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 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.

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-based control by setting ConfigurationECONEN.SW

to normally open (1). See Fig. 26 and Fig. 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. 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.

The field connection terminal board has SAT and RAT terminals.

When installing field sensors, use these terminals accordingly to

connect into the MBB.

IMPORTANT: When wiring a field SAT sensor, the factory

installed on must be disconnected from the back of the terminal

board.

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 HIGH humidity.

TB or TB B--HUM Discrete Input to Board.......

TB or TB B--R--2 24 VAC Dry Contact Source........

NOTE: The humidistat terminals are only in use when the unit is

equipped with the Humidi--MiZer factory option.

Space Humidity Sensor

The space relative humidity sensor (part no. 33ZCSENDRH--01

duct mount or 33ZCSENSRH--01 wall mount) is a field--installed

accessory. The space relative humidity (RHS) may be selected for

use if the outdoor air quality sensor (OAQ) is not used and an

economizer board is installed. When installing the relative

humidity sensor, the unit must be configured by setting

ConfigurationUNITRH.S to YES.

TB or TB B--LPWR 24 VDC Loop Power.............

TB or TB B--SPRH 4--20mA Input Signal.......

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Carrier 50HCQA Installation Manual Page 74

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