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ED 15103-6 • MICROTECH III WSHP UNIT CONTROLLER
Table 16: Network Variable Outputs (NVOs) - 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 Outputs (NVOs)
Previous Alarm
nvoPreviousAlarm
(27)
SNVT_str_asc
(36)
Init: No Alarms
No
Indicates the previous unit fault.
Alarm Strings
• No Alarms
• Low Voltage Brownout
• Comp #1 High Pressure
• Comp #2 High Pressure
• Comp #1 Low Pressure
• Comp #2 Low Pressure
• Comp #1 Suctn Temp Snsr Fail
• Comp #2 Suctn Temp Snsr Fail
• Comp #1 Low Suction Temp
• Comp #2 Low Suction Temp
• Room Temp Sensor Fail
• Entering Water Temp Snsr Fail
•
Condensate Overflow
• Serial EEPROM Corrupted
•
Invalid Configuration
• Low Entering Water Temp
Pump Request Output
nvoPumpRequest
(28)
SNVT_switch
(95)
Default: Null
No
Indicates when the unit is requesting flow from the loop water
controller. The loop pump must be running to provide adequate
flow through the unit so the compressor(s) can operate safely.
nviComprEnable can be used by the BAS to indicate if proper
loop fluid flow is occurring.
Selection State Value
No Flow Req 0 0%
Flow Req 1 100%
Null -1 0 to 100%
Setpoint Shift Output
nvoSetptShift
(25)
SNVT_temp_setpt
(106)
-3 to 3ºF
-1.67 to 1.67ºC
Init:
All Setpts 0ºF
Send
Represents the local hardwired setpoint adjustment value from
the room sensor potentiometer. It is valid when configured for
Short Range Setpoint Adjust.
Supported Fields
• occupied_cool
• standby_cool
• unoccupied_cool (always 0)
• occupied_heat
• standby_heat
• unoccupied_heat (always 0)
Status
nvoStatus
SNVT_obj_status
(93)
Init:
All structure
elements = 0
No
Reports the status of the requested functional block in the
device as commanded from nviRequest.
Supported Fields
• object_id: 0=Node Obj, 1=McQuaySCC_WSHP
• invalid_id: 0=Normal ID, 1=Invalid ID
• invalid_request: 0=Valid Req, 1=Invalid Req
• report_mask: 0=Not Supported, 1=Supported
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).
