Communication Wiring - Protocols - Carrier WeatherMaster 50HC14 Installation Instructions Manual

Humidistat
The accessory humidistat provides the RTU Open control-
ler insight to the relative humidity in the space. The humidi-
stat reads the RH level in the space and compares it to its set-
point to operate a dry contact. The humidistat is a dedicated
input on the configurable input 9 and tells the RTU Open con-
troller when the RH level is HIGH or LOW. The normal con-
dition for humidity is LOW. A normally open humidistat is
the factory default control for the Humidi-MiZer system
option.
To wire in the field:
• J5 8 = 24 vac source for dry contact
-
• J5 7 = Signal input
-
SMOKE DETECTOR/FIRE SHUTDOWN (FSD)
On 50HC 14 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 de-
tector's Alarm NO contact set. The RTU Open controller
communicates the smoke detector's tripped status to the BAS
building control. See Fig. 80, (RTU Open Controller wiring
diagrams).
The Fire Shutdown Switch configuration, MENU
 
fig 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 set-
 
ting MENU Config Inputs
Status and normally open (N/O) or normally closed (N/C). In-
put 8 or 9 is recommended for ease of installation. Refer to
Fig. 79 and Fig. 80 or 81 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 MENU Config
9 to Fan Status and normally open (N/O) or normally closed
(N/C). Input 8 or 9 is recommended for ease of installation.
Refer to Fig. 79 and Fig. 80 or 81 for wire terminations at J5.
PROTOCOL
BACnet MS/TP (Master)
Modbus (Slave)
N2 (Slave)
LonWorks
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
BAUD RATE
9600
19,200
38,400
76,800

Con-

input 3, 5, 8, or 9 to Filter
 
Inputs input 3, 5, 8, or
SW3 Protocol Selection
DS8 DS7
Unused OFF
Unused OFF
Unused OFF
Unused ON
DS2 DS1
OFF OFF
ON OFF
OFF ON
ON ON
Fig. 89 — RTU Open Controller SW3 Dip Switch Settings
Remote Occupancy
The remote occupancy accessory is a field-installed acces-
sory. 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
 
MENU Config
cupancy and normally open (N/O) or normally closed (N/C).
Also set MENU
on/off. Input 8 or 9 is recommended for ease of installation.
Refer to Fig. 79 and Table 25 for wire terminations at J5.
Power Exhaust (output)
The relay used by the RTU Open controller board to con-
trol power exhaust is a dry contact which means it does not
have 24 vac. This 24 vac must be connected to the relay to al-
low it to operate the power exhaust relay in the PE accessory.
A 24 vac source must be provided to J11
controller board. This can be provided by the unit's trans-
former from various sources. The "R" terminal on the unit's
central terminal board (CTB) is a logical source. Refer to
Fig. 79 and Fig. 80 or 81 for wire terminations at J11.
Communication Wiring
GENERAL
Protocols are the communication languages spoken by
control devices. The main purpose of a protocol is to commu-
nicate information in the most efficient method possible. Dif-
ferent protocols exist to provide different kinds of informa-
tion for different applications. In the BAS application, many
different protocols are used, depending on manufacturer. Pro-
tocols do not change the function of a controller, just make
the front end user different.
The RTU Open controller can be set to communicate on
four different protocols: BACnet, Modbus, N2, and Lon-
Works. Switch 3 (SW3) on the board is used to set protocol
and baud rate. Switches 1 and 2 (SW1 and SW2) are used to
set the board's network address. See Fig. 89 and 90 for proto-
col switch settings and address switches. The third party con-
nection to the RTU Open controller is through plug J19. See
Fig. 91 for wiring.
NOTE: Power must be cycled after changing the SW1
settings.
Refer to the RTU Open Controller Integration Guide for
more detailed information on protocols, third party wiring,
and networking.
DS6 DS5 DS4
OFF OFF ON
OFF ON ON
OFF OFF ON
ON OFF ON
UNUSED
(OFF)
(ON)
PROTOCOL SELECTOR DIP SWITCHES
58

Inputs input 3, 5, 8, or 9 to Remote Oc-
 
Schedules occupancy source to DI
2 on the RTU Open
-
Protocols
—
DS3 DS2
Select
OFF
Baud
Select
OFF
Baud
ON OFF
OFF OFF
COMM
OPTION
SET TO
PORT
SET TO MSTP 38.4k
(MASTER)
BAUD
3 switch
-
DS1
Select Baud
Select Baud
OFF
ON