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3.Remove
the 5.6 kilo-ohm resistor and jumper TtoT1. T he
actuator should drive fullyopen.
4.Remove the jumper across T and T1.The actuator should
drive fullyclosed.
5.Return EconoMi$er
IV settings and wiring tonormal after
completing
troubleshooting.
EconoMi$er
IV Troubleshooting
This procedure
is used to return the EconoMi$er
IV to operation.
No troubleshooting
or testing is done by performing
the following
procedure.
1. Disconnect
power
at TR and TRI.
2. Set enthalpy
potentiometer
to previous
setting.
3. Set
DCV
maximum
position
potentiometer
to
previous
setting.
4. Set
minimum
position,
DCV
set
point,
and
exhaust
potentiometers
to previous
settings.
5. Remove
620-ohm
resistor
from terminals
SR and +.
6. Remove
1.2 kilo-ohm
checkout
resistor
from terminals
So
and +. If used, reconnect
sensor from terminals
So and +.
7. Remove
jumper
from TR to N.
8. Remove
jumper
from TR to 1.
9. Remove
5.6 kilo-ohm
resistor
from
T and T1. Reconnect
wires at T and T1.
10. Remove
jumper
from P to PI. Reconnect
device
at P and
PI.
11. Apply
power
(24 vac) to terminals
TR and TRI.
Phase Loss Protection
The
phase
loss
protection
option
will monitor
the
three-phase
electrical
system
to
provide
phase
reversal
and
phase
loss
protection.
Phase
Reversal
Protection
If the control
senses an incorrect
phase relationship,
the relay (KI)
will be de-energized
(opening
its contact).
If the phase relationship
is correct,
the relay
will be energized.
The
control
has
a self-
bypass
function
after a pre-set
time. If the control
determines
that
the three phases
stay in a correct
relationship
for 10 consecutive
minutes,
the
relay
will
stay
energized
regardless
of the
phase
sequence
of three
inputs
as long
as 24-vac
control
voltage
is
applied.
This self-bypass
function
will be reset if all three phases
are restored
in a phase loss event.
Phase
Loss
Protection
If the reverse rotation board senses any one of the three phase
inputs has no AC voltage, the relay will be deenergized (opening
its contact). This protection is always active as long as 24-vac
control voltage is applied, and is not affected by the self-bypass
function of the phase sequence monitoring function. However, in
the event of phase loss, the relay will be re-energized only if all
three phases are restored and the three phases are in the correct
sequence.
A red LED is provided to indicate the function of the board. See
the table below.
LED STATUS
FUNCTION
On Continuously
Relay contact
closed
(normal
operation).
Relay contact
open (phase
loss or phase
Blinking
reversal has occurred)
-- No power will be
supplied
to the control
system.
Off
24 vac control
power
not present
(off).
46
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