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POINT NAME
Space Temp / Zone Temp
Supply Air Temperature
Outdoor Air Temperature
Space Temperature Offset Pot
Safety Chain Feedback
Compressor Safety Status
Fire Shutdown Status
Enthalpy Status
Humidistat Input Status
Zone Temperature
Indoor Air CO2
Outdoor Air CO2
Space Relative Humidity
Supply Fan Status*
Filter Status*
Door Contact Input*
Occupancy Contact*
Economizer Output
Supply Fan Relay State
Compressor 1 Relay State
Compressor 2 Relay State
Heat Stage 1 Relay State
Heat Stage 2 Relay State
Power Exhaust Relay State
Perfect Humidity Relay State
* These inputs (if installed) take the place of the default input on the specific channel
Parallel pins J5- 1 = J2- 6, J5- 3 = J1- 10, J5- 5 = J1- 2 are used for filed installation.
Refer to the input configuration and accessory sections for more detail.
Sensors and Accessories
The RTU Open controller is configurable with the
following field-supplied sensors:
NOTE: Supply air temperature sensor (33ZCSENSAT) is
factory-installed.
S Space temperature sensor (33ZCT55SPT, 33ZCT56SPT,
or 33ZCT59SPT)
S Indoor air quality sensor (33ZCSPTCO2- 01,
33ZCSPTCO2LCD- 01, 33ZCT55CO2, 33ZCT56CO2)
required for demand control ventilation.
S Outdoor air quality sensor (33ZCSPTCO2- 01,
33ZCSPTCO2LCD- 01)
S CO
aspirator box (C33ZCCASPCO2) required for CO
2
return duct/outside air applications
S Outdoor air enthalpy switch (33CSENTHSW)
S Return air enthalpy sensor (33CSENTSEN) required for
differential enthalpy control
S Space relative humidity sensor (33ZCSENSRH-02)
S Duct relative humidity (33ZCSENDRH-02)
S Humidistat (--HL--38MG-029)
S Smoke Detectors (CRSMKSEN002A00,
CRSMKKIT002A00)
S Fan and/or Filter Status (CRSTATUS001A00,
CRSTATUS005A00)
Table 1 – RTU Open Inputs and Outputs
BACnet OBJECT
NAME
DEDICATED INPUTS
zone_temp
sa_temp
oa_temp
stpt_adj_offset
safety_status
comp_status
firedown_status
enthalpy_status
humstat_status
n/a
CONFIGURABLE INPUTS
iaq
oaq
space_rh
sfan_status
filter_status
door_contact_status
occ_contact_status
OUTPUTS
econ_output
sfan
comp_1
comp_2
heat_1
heat_2
pexh
dehum
User Interfaces
S BACview
S Virtual BACview (USB-L or USB-TKIT required)
S Field Assistant (USB-TKIT required)
Install Analog Sensors
Supply Air Sensor (SAT)
The factory supplies the discharge (supply) air sensor with
the unit and is pre- wired. On 04-16 size units, the SAT is
secured to the unit's supply duct opening. This sensor
must be relocated into the supply duct during unit
installation. On 17-30 size units, the SAT is mounted
through the side of the heat chamber below the fan deck,
and does NOT require relocation.
2
Outdoor Air Sensor (OAT)
The OAT is supplied with the economizer option or
accessory. It is wired through the 12-pin plug (PL6) in the
return air section of the unit and is mounted on the
economizer assembly.
Space Temperature Sensor (SPT)
SPT sensors available from Bryant are resistive input
non-communicating (T55, T56, and T59) sensors. These
sensors have a variety of options consisting of: timed
override button, set point adjustment, and a LCD screen.
Space temperature can be also be written to from a building
network or zoning system. However, it is still recommended
that return air duct sensor be installed to allow stand-alone
operation for back-up. Refer to the configuration section for
details on controller configurations associated with space
sensors.
4
TYPE OF I/O
AI (10K Thermistor)
AI (10K Thermistor)
AI (10K Thermistor)
AI (100K Potentiometer)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
n/a
AI (4- 20 ma)
AI (4- 20 ma)
AI (4- 20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
AO (4- 20ma)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC , 1A)
DO Relay (24VAC, 1A)
6
Handheld (BV6H)
CONNECTION PIN
NUMBER(S)
J20- 1 & 2
J2- 1 & 2
J2- 3 & 4
J20- 3 & 4
J1- 9
J1- 2
J1- 10
J2- 6 & 7
J5- 7 & 8
J13- 1, 2, 3, 4
J4- 2 & 3 or J4- 5 & 6
J5- 1 or J5- 3 or J5- 5
J2- 5
J1- 4
J1- 8
J1- 7
J1- 6
J1- 5
J11- 1 & 3
J11- 7, 8
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