AAON RN-140 - Manual (Page 91)

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the inlet. A screw driver or crowbar can be
used to help accomplish this. Use the pry
slots on the back side of the motor mount.
Pull the motor mount to the edge of the
blower frame at the opening.
Remove the motor mount with the motor
and blower wheel attached. Large motors
will require more than one person.
Care must be taken not to damage the
compressors or refrigerant lines when
removing the motor and fan assembly.
Phase and Brownout Protection
Voltage monitor should be wired according
to unit specific wiring diagram include in
the control compartment.
Before applying power to the unit the
voltage monitor should be set up. The three
knobs on the front of the monitor should be
adjusted.
Figure 48 - Voltage Monitor
Adjust the top knob labeled LINE VOLT to
the operating voltage. This should be the
operating voltage for the equipment and the
measured voltage on the single or three
phase lines.
Adjust the knob labeled %± to either
SINGLE PHASE on the left side of the dial
or 3 PHASE on the right side of the dial.
After selecting single or three phase set the
knob to the percentage of Over or Under
voltage desired. A typical over and under
voltage percentage is 10%.
Adjust the bottom knob labeled RESTART
DELAY.
For automatic restart after
recovery of voltage select from 2 seconds up
to 5 minutes. After recovery of line voltage
this is how long the monitor will wait before
energizing the output relay. For manual reset
adjust the knob fully clockwise to MR. After
recovery of line voltage the MANUAL
RESET button located between the 2 LEDs
must be pressed.
Now that the settings have been made, you
can apply the supply and line voltages to the
monitor. The monitor will only operate
when the supply voltage is available.
On power up, with the line voltage and the
supply voltage applied, the monitor takes 3
to 10 seconds to evaluate the line voltage,
compare that voltage to the knob settings
and then energize if all parameters are
satisfied or will remain off if any operating
parameter is incorrect.
All of the knob adjustments are adjustable
after power up, except the voltage range will
not change and going from single or three
phase to the other will not change (i.e.
within 440 to 480 VAC, but not to 208 or
230 VAC).
LED Codes
Powering up with voltage present which
matches knob settings:
1. On/Off LED = Alternating Green/Red
Phase Loss LED = Out
2. On/Off LED = Out
Phase Loss LED = Alt. G/R
3. On/Off LED = Alt. G/R
Phase Loss LED = Out
Phase
Loss/Rev.
LED
On/Off
LED