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www.DaikinApplied.com 23
ED 15103-6 • MICROTECH III WSHP UNIT CONTROLLER
Table 14:
Device Objects - SmartSource Single and Two Stage, Enfinity Large Two Compressor
Point Name
Object
Type/
Instance
Read/
Write
Access
2
BACnet Object
Name
Range/Default
(in Units)
Non-
volatile
Memory
1
Description
DEVICE
Description
Device
W
Description
32 Characters
Y
Text string. Property can be changed through the BACnet
configuration menu or the BAS. See
Instance
Device
W
Object_Identifier
1 to 4194302
Y
Unique Instance Number or object-identifier assigned by
integrator. See
BACnet Configuration and Commissioning
.
Location
Device
W
Location
32 Characters
Y
Text string that can be changed through the BACnet
configuration menu or the BAS. See
Name
Device
W
Object_Name
32 Characters
Y
The following applies when changes are made through
the BACnet configuration menu: If a period “.” is entered
as the first character, then the name is set to “MTIIIUC_
WSHP_Ser2_0000000” and the zeros are set to the Device
Instance. If a space character is entered as the first
character, then the Device Instance is automatically filled
in at the first 0 (zero) character in the name. Example: the
Device Instance has been changed to 321. If the name was
previously “WSHP_Ser2_0000300” and a space is entered
at the name prompt, the new name automatically fills in
as “WSHP_Ser2_0000321”. If a period is entered at the
name prompt, the new name changes to “MTIIIUC_WSHP_
Ser2_0000321”.
Device Prefixes
• SmartSource (Series2): “MTIIIUC_WSHP_Ser2_”
•
Enfinity Large Two Compressor (SS2C):
“MTIIIUC_WSHP_SS2C_”
Software Identification
Device
R
Firmware_Revision
32 Characters
N
The software version of the communication module
firmware.
Unit Application Version
Device
R
Application_
Software_Version
32 Characters
N
The software version of the unit controller.
MaxMasters
Device
W
Max_Master
1 to 127
Default: 127
Y
MaxMasters should be set to highest address of a MS/TP
master on the network segment. The default value is 127
for maximum compatibility. Setting this to the highest
address of an MS/TP master device on the network reduces
the MS/TP token traffic and decreases the response time
of the unit controller. MaxMasters can be set from the
BAS or from the BACnet configuration menu. See
Configuration and Commissioning
.
MS/TP Baud Rate
NA
NA
NA
9600, 19200,
38400, 76800
Default: 38400
Y
Set the baud rate to match the speed of the network.
Speeds above 38400 should be avoided unless the
network wiring has been tested and verified to meet the
required speed. The baud rate must be set using the
BACnet configuration menu. See
.
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. The values of the individual Occupancy Temperature Setpoints (AV1 to AV6) must be kept in ascending order as follows:
AV6 <= AV5 <= AV4 <= AV1 <= AV2 <= AV3
4. AV412 has an ObjectName of SystemMinInstance, the Present Value is writeable, and it has a default value of 3101000. During the commissioning process, the
present value of AV412 is added to the MAC Address to determine the Device Instance Number. In order to change the value of AV412 on the BACnet communication
module in the unconfigured state, the BAS must broadcast a new present value to AV412 using the BACnet service (BIBB – BACnet Interface Building Block) called
“Unconfirmed COV” with a ProcessID value of 1. This prevents unauthorized unconfirmed writes, or changes, to AV412. Note that this change affects the AV412
present value for every water source heat pump BACnet communication module on the trunk.
5. The auto-addressing feature was designed for units communicating to a Daikin Intelligent System (IS) Manager. However, any BAS can configure a MicroTech
III WSHP unit controller with BACnet communication module for auto-addressing. AV412 can be set via the BAS using auto-addressing, but this feature is intended
primarily for the IS controller. See the Daikin System Manager Operation Manual, OM 1254, and the MicroTech III BACnet MS/TP Communication Module Installation
Manual, IM 928, both available on
, for complete details on using auto-addressing with the IS controller.
6. Analog Null is a discrete temperature value of 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.
7. After Receive Heartbeat is enabled, this variable reverts to the default (non-override) value if it is not refreshed often enough through a network command or if
communication is disabled (i.e. BACnet device communication control = disable).
8. The totalizer continues to increment until the maximum count is reached, at which point the BAS must reset the value by issuing a write command. Variable is
saved in nonvolatile memory every 24 hours. If power is lost, that day’s totalizer information is not stored.
