Carrier /50HC 04-28 Controls, Start-Up, Operation And Troubleshooting Download

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CONDENSATE OVERFLOW SWITCH (COFS)
A separate factory installed device can detect a full drain pan.

This device consists of a pan sensor to detect the water level

and a relay control switch to read the sensor. The control

switch is located in the unit control box and will trip out the

compressors on overflow detection. Since this device is in se-

ries with the compressor contactor and high pressure switch on

any given circuit,

Comfort

Link does not directly read this. The

relay switch is a normally open device that closes when power

is applied; this allows the compressor to be energized without

problem. If the sensor detects high water levels for 10 seconds

straight, it will open the contact breaking the compressor call.

The switch will also turn its red LED on. If the water level is

low enough for 5 minutes the relay will close again allowing

the compressor call. A blinking red LED on the switch indi-

cates that the sensor has been disconnected.

Field-Installed Accessories

SPACE TEMPERATURE SENSOR (T-55)
The T-55 space temperature sensor (part no. 33ZCT55SPT) is a

field-installed accessory. The sensor is installed on a building

interior wall to measure room air temperature. The T-55 sensor

also includes an override button on the front cover to permit

occupants to override the Unoccupied Schedule (if pro-

grammed). The jumper wire in the installer’s packet must be

connected between R and W1 when using a T-55 device.
TB or TB A-SPT+ . . . Sensor Input
TB or TB A-SPT– . . . Sensor Common
SPACE TEMPERATURE SENSOR (T-56)
The T-56 space temperature sensor (part no. 33ZCT56SPT) is a

field-installed accessory. This sensor includes a sliding scale

on the front cover that permits an occupant to adjust the space

temperature set point remotely. The T-56 sensor also includes

an override button on the front cover to allow occupants to

override the unoccupied schedule (if programmed). The jump-

er wire in the installer’s packet must be connected between R

and W1 when using a T-56 device.
TB or TB A-SPT+ ... Sensor Input
TB or TB A-SPT– ... Sensor Common
TB or TB A-SPTO ... Setpoint Offset Input
SPACE TEMPERATURE SENSOR (T-58)
The T-58 space temperature sensor (part no. 33ZCT58SPT) is a

field-installed accessory. The T-58 sensor communicates with

the

Comfort

Link controller, providing space temperature, heat-

ing and cooling set points, and mode operation information.

The jumper wire in the installer’s packet must be connected be-

tween R and W1 when using a T-58 device.
Refer to the T-58 installation instructions for information on in-

stalling and configuring the T-58 sensor.
Each T-58 sensor must have a unique address on the CCN.

Each T-58 sensor must also be configured with the address of

the unit control it is communicating to.
SPACE TEMPERATURE SENSOR AVERAGING
See Fig. 40 for space temperature averaging with T-55 sensors

only. If the use of one T-56 sensor is required, refer to Fig. 41.
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 in-

clude 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. On 04-14 size units a

9 pin to 12 pin converter harness is required and is included in

the kit or factory installed.
INDOOR AIR QUALITY
The indoor air quality (IAQ) sensor (part no. 33ZCSENCO2)

is a field-installed accessory which measures CO

levels in the

air. When installing this sensor, an ECB board must be in-

stalled 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 or TB B-IAQ . . . . . . . . 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)
OUTDOOR AIR QUALITY
The outdoor air quality (OAQ) sensor is a field-installed acces-

sory 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

Configura-

tion



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 detec-

tors 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

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 accesso-

ry, the unit must be configured for filter status by setting

Con-

figuration



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 Acces-