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58
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
Con-
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
input 3, 5, 8, or 9
to Filter
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
Inputs
input 3, 5, 8, or
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.
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
Inputs
input 3, 5, 8, or 9
to Remote Oc-
cupancy 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 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
-
2 on the RTU Open
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
—
Protocols
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
-
3 switch
settings.
Refer to the RTU Open Controller Integration Guide for
more detailed information on protocols, third party wiring,
and networking.
SW3 Protocol Selection
NOTE:
DS = Dip Switch
BACnet MS/TP SW3 example shown
Baud Rate Selections
Fig. 89 — RTU Open Controller SW3 Dip Switch Settings
PROTOCOL
DS8
DS7
DS6
DS5
DS4
DS3
DS2
DS1
BACnet MS/TP (Master)
Unused
OFF
OFF
OFF
ON
OFF
Select
Baud
Select Baud
Modbus (Slave)
Unused
OFF
OFF
ON
ON
OFF
Select
Baud
Select Baud
N2 (Slave)
Unused
OFF
OFF
OFF
ON
ON
OFF
OFF
LonWorks
Unused
ON
ON
OFF
ON
OFF
OFF
ON
BAUD RATE
DS2
DS1
9600
OFF
OFF
19,200
ON
OFF
38,400
OFF
ON
76,800
ON
ON
UNU
S
ED
(OFF)
(ON)
COMM
OPTION
PORT
S
ET TO M
S
TP
(MA
S
TER)
S
ET TO
38
.4k
BAUD
PROTOCOL
S
ELECTOR DIP
S
WITCHE
S
Summary of Contents for WeatherMaster 50HC14
Page 4: ...4 Fig 2 Unit Dimensional Drawing 14 Size Unit ...
Page 5: ...5 Fig 2 Unit Dimensional Drawing 14 Size Unit cont HORIZONTAL ECONOMIZER VERTICAL ECONOMIZER ...
Page 8: ...8 Fig 4 Roof Curb Details ...
Page 24: ...24 Fig 46 Typical Humidi MiZer Adaptive Dehumidification System Humidistat Wiring ...
Page 39: ...39 Fig 54 50HC14 Control Box Component Locations with ComfortLink Controls ...
Page 40: ...40 Fig 55 50HC14 ComfortLink Control Wiring Diagram ...
Page 41: ...41 Fig 56 50HC14 ComfortLink Power Wiring Diagram ...
Page 42: ...42 Fig 57 50HC14 ComfortLink with Humidi MiZer Power Wiring Diagram ...
Page 44: ...44 Fig 60 PremierLink Wiring Schematic ...
Page 45: ...45 Fig 61 PremierLink Wiring Schematic with Humidi MiZer System Option ...
Page 53: ...53 Fig 80 RTU Open System Control Wiring Diagram ...
Page 54: ...54 Fig 81 RTU Open System Control Wiring Diagram with Humidi MiZer System Option ...
Page 64: ......
Page 65: ......