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RECORDED HIGH OAT
The highest value of OAT noted since the last reset occurred. This
value will continue to update until Performance Data has been
changed to Reset or will automatically reset every 24 hours at
midnight if Save Performance Data Daily is set to Enable.
RECORDED LOW OAT
The lowest value of OAT noted since the last reset occurred. This
value will continue to update until Performance Data has been
changed to Reset or will automatically reset every 24 hours at
midnight if Save Performance Data Daily is set to Enable.
PERFORMANCE DATA
Indicates the mode that is currently in effect. This point is used to
reset all of the above performance data manually at any time.
Range = Collect/Reset
Default = Collect
HISTORICAL PERFORMANCE DATA
The VAV-RTU Open collects historical performance every time
the performance data above has been reset.
SAVE PERFORMANCE DATA DAILY
If set to Enable, the control will automatically transfer the Current
Performance Data directly to the Historical Performance Data val-
ues for each entry once every 24 hours at midnight. All Historical
data will only be available for viewing for the next 24 hours. Also,
all current performance data will be reset after the data has been
transferred.
Range = Disable/Enable
Default = Enable
EQUIPMENT RUNTIME
The value of the equipment runtime when the current performance
data was last reset.
Obtain the manufacture date from a... Notes
Module status report (modstat)
Sticker on the control board "Serial No:
OR2YMCxxxP" (Bar Coded and Typed
Number)
Problem
No communication with third party vendor
Table 5 — Manufacture Date
When troubleshooting, you may need to know a control module's manufacture date.
To obtain a modstat with Field Assistant:
1. Press Function (FN) key and hold.
2. Then press period (.)
3. Release both buttons.
The report shows the date under Main board hardware.
The serial numbers are unique and contain embedded information, for example OR2420042P:
"VRT" — These first three digits are unique to VAV-RTUOpen and are used as an identifier.
"YM"
— These two digits identify the last digit of the year and month (in hex, A=10/Oct) of
manufacture. "42" would represent a date of manufacture of "Feb 2014".
"C"
— Thousands counter 0- 9 and A- Z; A = 10; Z = 35
"xxx"
— These three digits represent the sequential number of units produced for a given product for
the mentioned manufacturing time period.
"P"
— This final digit represents the decade and toggles between "N" and "M" every ten years.
Table 6 — Basic Protocol Troubleshooting
Possible cause
Incorrect settings on SW1, SW2 and SW3
RS485 Port has no voltage output (check with
VAV-RTU Open disconnected from RS485
communication bus):
• BACnet @ 9600/19.2K - 01 to 045vdc
• BACnet @ 38.4K - 06 to 09vdc
• BACnet @ 76.8K - 1vdc
Verify devices are daisy chained and repeaters
and bias terminators are correctly installed.
ECONOMIZER UTILIZATION
The value of the Economizer Utilization when the current perfo
mance data was last reset.
DCV UTILIZATION
The value of the DCV Utilization when the current performance
data was last reset.
UNOCC FREE COOL UTILIZATION
The value of the Unocc Free Cool Utilization when the current
performance data was last reset.
PART LOAD COOLING UTILIZATION
The value of the Part Load Cooling Utilization when the current
performance data was last reset.
FULL LOAD COOLING UTILIZATION
The value of the Full Load Cooling Utilization when the current
performance data was last reset.
HEATING UTILIZATION
The value of the Heating Utilization when the current perfor-
mance data was last reset.
PREVIOUS HIGH OAT
The value of the Recorded High OAT when the current perfor-
mance data was last reset.
PREVIOUS LOW OAT
The value of the Recorded Low OAT when the current perfor-
mance data was last reset.
Third Party Networking
Third party communication and networking troubleshooting
should be done by or with assistance from the front end third party
technician. A Module Status Report (Modstat) can be run from
Field Assistance or Equipment Touch (see Table 5 to perform).
This lists information about the board status and networking state.
For basic protocol troubleshooting see Table 6.
Corrective action
Verify and correct switch settings. Cycle power
to VAV-RTU Open after changing switch
settings.
Verify VAV-RTU Open has correct power supply.
Possible bad driver on board.
Check RS485 bus for external voltage before
reconnecting to the bus.
Check third party vendor RS485 communication
wiring guidelines and troubleshooting
procedures.
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