Carrier 48TC Instruction Manual download pdf (Page 36)

Relative Humidity Sensor

(Polarized Male Connector)

J4-1 or J4-4 + 24 VDC Supply Voltage

J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output

to RTU-OPEN

4-20 VAC GND 0-5V

mA or or

VDC 0-10V

SPAN

ZERO

C10839

Fig. 64 -- Duct Relative Humidity Sensor Typical Wiring

Humidistat: The accessory humidistat provides the RTU

Open insight to the relative humidity in the space. The

humidistat reads the RH level in the space and compares it

to its setpoint to operate a dry contact. The humidistat is a

dedicated input on the configurable input 9 and tells the

RTU Open when the RH level is HIGH or LOW. The

normal condition for humidity is LOW. A normally open

humidistat is the factory default control for the

Humidi--MiZer

option.

To wire in the field:

S J5--8 = 24 VAC source for dry contact

S J5--7 = Signal input

Smoke Detector/Fire Shutdown (FSD) —

On 48TC units equipped with factory--installed Smoke

Detector(s), the smoke detector controller implements the

unit shutdown through its NC contact set connected to the

unit’s CTB input. The FSD function is initiated via the

smoke detector’s Alarm NO contact set. The RTU Open

controller communicates the smoke detector’s tripped

status to the BAS building control. See Figs. 56 and 57,

the RTU Open System Control wiring schematics.

The Fire Shutdown Switch configuration,

→

Config

→

Inputs

→

input 5, identifies the normally

open status of this input when there is no fire alarm.

Connecting Discrete Inputs —

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

→

Config

→

Inputs

→

input3,5,8,or9to Filter

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 55 and Fig. 56 or Fig. 57 for wire terminations at J5.

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

→

Config

→

Inputs

→

input3,5,8,or9to Fan

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 55 and Figs. 56 or 57 for wire terminations at J5.

Remote Occupancy: The remote occupancy accessory is

a field--installed accessory. This accessory overrides the

unoccupied mode and puts the unit in occupied mode.

When installing this accessory, the unit must be

configured for remote occupancy by setting

→

Config

→

Inputs

→

input3,5,8,or9to Remote

Occupancy and normally open (N/O) or normally closed

(N/C).

Also set MENU

→

Schedules

→

occupancy source to DI

on/off. Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 55 and Table 8 for wire

terminations at J5.

Power Exhaust (output): The relay used by the RTU

Open board to control power exhaust is a dry contact

which means it does not have 24vac. This 24vac must be

connected to the relay to allow it to operate the power

exhaust relay in the PE accessory. A 24vac source must be

provided to J11--2 on the RTU Open control board. This

can be provided by the unit’s transformer from various

sources. The “R” terminal on the unit’s low voltage

terminal board (LVTB) is a logical source. Refer to Fig.

55 and Figs. 56 or 57 for wire terminations at J11.

48TC

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Carrier 48TC Instruction Manual Page 36

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