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3. EL Electrical
A. LED indicators on EL board.
•
Yellow off / Green on – unit operating OK.
See D. Both LED's off – no power. Supply
voltage should be 22-26 VAC. Measure
voltage between terminal screws.
•
If not 22-26 VAC, check source and make
sure wire are making contact with the
terminals.
•
Yellow on / Green off – no program.
Contact Acutherm.
•
Yellow blinking / Green off – needs to be
commissioned using network
management tools.
•
Yellow off / Green blinking (long: 1 sec, short: .5 sec)
•
Both LED's on – contact Acutherm.
B.
Network Information
•
Use a computer on the network with software for LonMaker or other network management tool to select
or highlight the specific EL unit.
•
Browse the network variables to locate "nvoUnitStatus."
•
Go to the end of the fields and look at the last number set which is "ALARM". The alarm codes are:
1= Faulty room temp. sensor / wiring connection. See C. below.
2= Faulty supply air temp. sensor / wiring connection. See C. below.
4= Faulty flow sensors / wiring connection. See C. below.
8= Out-of-range reference voltage. Must be cleared by resetting. See D.
Combinations of codes are:
3=1+2
5=1+4
6=2+4
C.
Where faulty sensor / wiring connections are indicated, remove the controller cover. Then remove the
wires to each sensor (room temp, duct temp and flow 1) from the terminal and measure the resistance
between each wire and the terminal marked common. If the resistance is between 360 and 2000, reinstall
the wire making sure that it makes contact with the terminal. If the resistance is outside the range, check
the common terminal connections. If all common wires are in contact with the terminals and the resistance
is still outside the range, contact Acutherm.
1 long 1 short = Faulty room temp. sensor / wiring connection. See C. below.
1 long 2 short = Faulty supply air temp. sensor / wiring connection. See C. below.
1 long 3 short = Out-of-range reference voltage. Must be cleared by resetting. See D.
1 long 4 short = Faulty flow sensor / wiring connection. See C. below.
7=1+2+4
9=1+8
10=2+8
11=1+2+8
12=4+8
13=1+4+8
10
15=1+2+4+8
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