BACNET DATA TABLES
MT2300 WSHP BACNET INTEGRATION
DAIKIN APPLIED
8
BACnet Data Tables
CAUTION
Please note that each time a command is written to a configuration property,
(noted by a “cp” in front of the BACnet object name) the data is stored in
the unit controller’s non-volatile or Flash memory. Writing to Flash memory
is an operation that has a finite limit. For this reason, the number of writes
made to BACnet objects linked to configuration properties must be limited
to avoid damage to the hardware.
BACnet Network Parameters
The following section contains relevant information needed to
integrate a MicroTech WSHP into the BACnet network .
The
,
sections provide additional
details . Also see
NOTE:
Changing a temperature setpoint’s minimum or
maximum value may result in an “Out of Range”
error . This is due to the internal Fahrenheit to Celsius
conversion . To prevent this error from occurring,
use an offset of 0.1º when writing to a minimum or
maximum temperature setpoint value .
Table 3: Analog Inputs
Point Name
Object
Type/
Instance
BACnet Object
Name
Range/Default
Read/
Write
Access
2
Non-
volatile
Memory
1
Description
Local Space
Temperature
AI:1
LocalSpaceTemp
0 to 158ºF
-17.77 to 70ºC
Default:
68ºF / 20ºC
R
N
Reflects the value provided from either a room temperature
sensor or thermostat input .
3
Leaving Water
Temperature
AI:2
LWT
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
Reflects the leaving water temperature sensor value, if
installed and configured with a valid input.
3
Entering Water
Temperature
AI:3
EWT
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
Reflects the entering water temperature sensor value, if
installed and configured with a valid input.
3
Discharge Air
Temperature
AI:4
DischAirTemp
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
Reflects the discharge air temperature sensor value, if
installed and configured with a valid input.
3
Local Setpoint Adjust
AI:5
LocalSetpt
55 to 95ºF
12.78 to 35ºC
Default:
32ºF / 0ºC
R
N
Reflects the value of the selected control temperature
(space, return air, average) long range reference setpoint .
Applies when configured for long range setpoint adjust
(baseboard configuration switch 5 is on) and is enabled
by MSV:14 .
3
This setpoint is also used to calculate the effective heating/
cooling setpoints . See
Compressor 1 Suction
Temperature
AI:6
Comp1SuctionTemp
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
Indicates the compressor #1 suction line temperature
sensor value .
3
Compressor 2 Suction
Temperature
AI:7
Comp2SuctionTemp
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
Indicates the compressor #2 suction line temperature
sensor value .
3
Brownout Voltage
Reading
AI:8
Brownout
0 to 4095 counts
Default: 0
R
N
The compressr brownout voltage used for factory-unit
controller calibration . This reference value (in counts) is
compared to the brownout trip and recover setpoints to
determine if a brownout condition exists . Also see AV:9 .
Local Space Humidity
AI:9
LocalSpaceRH
1 to 100%
R
N
Reflects the value of the indoor relative humidity sensor, if
installed and configured with a valid input. The input is also
used to calculate the local space dewpoint value .
Return Air Temperature
AI:10
RAT
0 to 158°F
-17 .77 to 70°C
Default:
32ºF / 0ºC
R
N
The value of the room/return air temperature (RAT), if
installed and configured with a valid input.
1
Parameter is stored in FLASH/EEPROM (non-volatile memory) in either the communication module or in the unit controller . If Non-volatile Memory = Y, then the
value is saved through a power cycle . Writes to this parameter must be limited . If Non-volatile Memory = N, the value is not saved through a power cycle .
2
R = Read Only, W = Writeable, C = Commandable
3
A Null value is equal to 621.806ºF/327.67ºC. Its purpose is to indicate a sensor failure condition or when the unit controller is not using that particular temperature
value .