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BACNET™ MOTORIZED VAV DIFFUSER
TROUBLE SHOOTING
EF-B Electrical
15. A green LED near the 24VAC Supply Power terminals should be lit indicating
good supply voltage (see Fig. 5 Wiring Diagram).
16. Check the fuse near the 24VAC Supply Power terminals (see Fig. 5 Wiring
Diagram).
17. Reset the EF-B using the network command ReinitalizeDevice. If
ReinitalizeDevice is unavailable from the preferred BACnet software then cycle
the power by unplugging the 24VAC Supply Power terminals and then reconnecting them.
18. Use a computer on the network running the preferred BACnet software to check the Status_Flags on each of the following
Objects: analog_input_0 (oRmTemp), analog_input_1 (oSATempt), and analog_input_3 (oFlowTemp).
a. If Status_Flag 'overridden' then check analog_value_26 (iRmTemp), analog_value_27 (iSATemp), and analog_value_28
(iFlowRate) respectively.
b. If Stuats_Flag 'in_alarm', 'fault', or 'out_of_service' then check the sensors.
i.
Remove the controller cover.
ii.
Remove the wires to each sensor (ROOM TEMP,
DUCT TEMP, and FLOW1-4 TEMP) from the
terminals (see Fig. 5 Wiring Diagram).
iii.
Measure the resistance between each wire
and the terminal marked common (see Fig. 4
Thermostors).
Motor Control Board (MCB)
19. Check power
a. Red LED on when end switch first engaged or flashing when motor moving
b. 35.5VDC on terminals + - PWM (occasional flicker of voltage when control signal is passed to MCB)
20. Check dip switch setting
a. EF-B-M-6 – ON OFF OFF OFF
b. EF-B-M-8 – OFF ON OFF OFF
21. Check motor
a. When looking in neck of diffuser
i.
Flash short-long = clockwise
ii.
Flash long-short = counterclockwise
b. Check motor winding resistance
i.
Unplug 6-pos connector on MCB
ii.
19Ω between 1A and 2A
22. Check switch
a. Switch on 0VDC between + - SW
6
BACNET™ MOTORIZED VAV DIFFUSER - Manual | acutherm.com
FIG. 4 THERMISTORS
Temperature
50ºF / 10ºC
77ºF / 25ºC
95ºF / 35ºC
iv. If the resistance is correct per Fig. 4 Thermistors,
reinstall the wire making sure that it makes contact
with the terminal.
v.
If the resistance is outside the range, check the
common terminal connections.
vi. If all common wires are in contact with the
terminals and the resistance is still outside the
range, contact Acutherm.
c. EF-B-M-10 – ON ON OFF OFF
d. EF-B-M-12 – OFF OFF ON OFF
iii.
EF-B-M is counterclockwise to close
iii.
19Ω between 1B and 2B
iv. No connectivity between 1 and 2
b. Switch off (open) 3VDC between + - SW
Resistance
2000 Ω
1000 Ω
650 Ω
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