Bryant 548J Service And Maintenance Instructions page 36

POINT NAME
Space Temperature Sensor
Supply Air Temperature
Local Outside Air Temperature Sensor
Space Temperature Offset Pot
Indoor Air Quality
Outdoor Air Quality
Safety Chain Feedback
Compressor Safety
Fire Shutdown
Enthalpy Switch
Humidistat Input Status
Space Relative Humidity
Outside Air Relative Humidity
Supply Fan Status
Filter Status
Remote Occupancy Input
Economizer Commanded Position
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
Dehumidification Relay State
LEGEND
AI --- Analog Input
AO --- Analog Output
DI --- Discrete Input
DO --- Discrete Output
* These inputs (if installed) take the place of the default input on the specific channel according to schematic.
Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5--- 5 = J1--- 2 are used for field --- installation.
Refer to the input configuration and accessory sections for more detail.
The RTU- - MP controller requires the use of a Bryant
space sensor. A standard thermostat cannot be used with
the RTU- - MP system.
Supply Air Temperature
FIOP- - equipped 548J unit, the unit is supplied with a
supply- - air temperature (SAT) sensor (33ZCSENSAT).
This sensor is a tubular probe type, approx 6- - inches
(153 mm) in length. It is a nominal 10- - k ohm thermistor.
See Table 15 for temperature- - resistance characteristic.
The SAT is factory- - wired. The SAT probe is wire- - tied to
the supply- - air opening (on the horizontal opening end) in
its shipping position. Remove the sensor for installation.
Re- - position the sensor in the flange of the supply- - air
opening or in the supply air duct (as required by local
1
codes). Drill or punch a
flange or duct. Use two field- - supplied, self- - drilling
screws to secure the sensor probe in a horizontal
orientation. See Fig. 49.
Table 14 – RTU- - MP Controller Inputs and Outputs
BACnet OBJECT
NAME
sptsens
sat
oatsens
sptopot
iaq
oaq
safety
compstat
firedown
enthalpy
humstat
CONFIGURABLE INPUTS*
sprh
oarh
fanstat
filtstat
remocc
econocmd
sf
comp_1
comp_2
heat_1
heat_2
aux_2
humizer
(SAT) Sensor —
/ - - in. (12.7 mm) hole in the
2
TYPE OF I/O
INPUTS
AI (10K Thermistor)
AI (10K Thermistor)
AI (10K Thermistor)
AI (100K Potentiometer)
AI (4---20 ma)
AI (4---20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
AI (4---20 ma)
AI (4---20 ma)
DI (24 VAC)
DI (24 VAC)
DI (24 VAC)
OUTPUTS
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)
On
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 49 - - Typical Mounting Location for Supply Air
Temperature (SAT) Sensor on Small Rooftop Units
36
CONNECTION PIN
NUMBERS
J20---1, 2
J2---1, 2
J2---3, 4
J20---3
J4---2, 3
J4---5, 6
J1---9
J1---2
J1---10
J2---6, 7
J5---7, 8
J4---2,3 or J4---5,6
J5---1,2 or J5---3,4 or
J5 5,6 or J5---7,8
J2---5
J1---4
J1---8
J1---7
J1---6
J1---5
J11---3
J11---7, 8
SUPPLY AIR RETURN AIR
ROOF
CURB
C08200