Daikin MicroTech III, Sales And Engineering Data Sheet

Page: 26 / 68

ED 15103-6 • MICROTECH III WSHP UNIT CONTROLLER 26 www.DaikinApplied.com
C
omprehensIve
d
aTa
T
ables
Table 15: Network Variable Inputs (NVIs) - Enfinity Single Stage Compressor, Continued
Point Name
l
on
W
orks
Variable
(NV Index
2
)
SNVT Type
(SNVT Index)
Range/
Default
(in Units)
Heart-
beat
Description
Network Variable Inputs (NVIs)
Request
nviRequest
(0)
SNVT_obj_request
Default:
0, RQ_NORMAL
No
Requests mode status information or sets operating mode
for a specific function block. The response is indicated in
nvoStatus.
Fields
• object_id: 0=Node Obj, 1=McQuaySCC_WSHP
• object_request: (See Supported Requests)
Supported Requests
0 = RQ_NORMAL
2 = RQ_UPDATE_STATUS
5 = RQ_REPORT_MASK
Space Temperature
Input
nviSpaceTemp
(3)
SNVT_temp_p
(105)
14 to 122°F
-10 to 50ºC
Default
1
:
621.806ºF
327.67ºC
Recv
Provides space temperature from the network as an option
instead of using the local temperature sensor. 1,3 The network
override will revert back to its default value upon unit controller
reboot.
Temperature Setpoint
Input
nviSetpoint
(13)
SNVT_temp_p
(105)
50 to 95ºF
10 to 35ºC
Default 1 :
621.806ºF
327.67ºC
No
Allows the network to set the reference setpoint in the
Occupied and Standby Occupancy modes. Local setpoint
operation must be disabled by nciLocSptEnable. nviSetpoint
always retains the last valid value after power-up. 1 The
network override will revert back to its default value upon unit
controller reboot. See Space Temperature Setpoint Methods .
Temperature Setpoint
Offset Input
nviSetptOffset
(12)
SNVT_temp_p
(105)
-18 to +18ºF
-10 to +10ºC
Default: 0ºF
Recv
Shifts the Occupied and Standby Effective Setpoints via the
network. The Unoccupied Effective Setpoints are not affected.
This is the Short Range Setpoint used when a remote room
sensor setpoint adjust is disabled. 3 The network override will
revert back to its default value upon unit controller reboot See
Space Temperature Setpoint Methods .
LonMark requires nviSetptOffset to be a SNVT_temp_p type,
which includes the 32°F offset. The network usable range is
14 to 50°F, which is converted to a differential temperature
(SNVT_temp_p_diff) by subtracting 32°F in the communication
module, resulting in an Effective Offset range of -18 to +18°F.
1. Analog Null (0x7FFF) 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 temperature value.
2. The Network Variable (NV) index number is a unique identifier for certain L
on
W
orks
variables. Some BAS companies use this numeric value instead of text to
reference these variables. The NV index number can also be found in the XIF file.
3. 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. the device is disabled or is offline).