Marine Air Systems ECU-Maxx, Operation Manual

Page: 17 / 31

PAGE 17
ECU-Maxx VER:10a 12/1/97
ECU-M
AXX
O
PERATIONS
M
ANUAL
ON - A continued low line voltage condition for 5 minutes will cause the compressor to turn
off while the fault code "LO-AC" flashes with the line voltage in the display. After 4 successive
failures the system requires a manual restart. (All Fail-safe Levels)
To restart ECU-Maxx manually, press the Power button to reset the unit to the OFF Mode.
P24: Fail-safe Protection Level
Fail-safe protection is offered at three levels, as enumerated in the table above.
Example: If the ECU-Maxx is in cooling mode and the high water limit is
exceeded for more than 10 seconds, the pump and compressor will be shut down
to prevent burning the motors out.
Note: Four consecutive shutdown events will lead to a sustained system
shutdown. The ECU-Maxx can be reset to the ON Mode by pressing the Power
button once.
P25: Temperature Hysteresis
Temperature Hysteresis is defined as the difference allowed between set point
and actual room temperature. When this difference is exceeded, the ECU-Maxx
will call for heating or cooling as required.
The 4º spread required to switch from automatic heating or cooling is not
affected by this option. The 4º spread is provided to prevent the control from
oscillating between heating and cooling while in Auto Mode.
The ECU-Maxx can be configured to provide 2º, 3°, 4º, 5° or 6º of hysteresis.
P26: System Current Limit
The ECU-Maxx limits the current supplied to the components attached to it.
This parameter sets the maximum current available to the power outputs. The
valid range of values is 5 to 40 Amperes. The factory default is 35 Amperes. If
the unit is operating at 220 VAC, current limit is half the displayed value.
F a ils a fe
P ro te ctio n
L e v e l
Actio n D e s c rip tio n o f Ac tio n Ta k e n b y E C U -M a x x
1 D is p la y fa ult o nly!
M IN IM U M P R O T E C T IO N L E V E L :
A ir S e ns o r F a ult: H e a ting/C o o ling im m e d ia te ly s us p e nd e d ; no rm a l
o p e ra tio n no t re s um e d until fa ult c le a re d . F a ult d is p la y: "A IR "
L o w Vo lta ge F a ult: E C U - II w ill re a c t a c c o rd ing to ho w L o w Vo lta ge
S hutd o w n p ro gra m m e d .
N O O T H E R F A IL S A F E P R O T E C T IO N P R O V ID E D .
2
D is p la y fa ult & s hut
d o w n c o m p re s s o r
w ith c o ntinuo us
re s ta rts .
IN T E R M E D IAT E P R O T E C T IO N L E V E L :
A ll a c tio ns ta k e n in F a ils a fe P ro te c tio n L e ve l 1 P lus :
In a d d itio n, the F A U LT C O D E m e s s a ge w ill b e d is p la ye d b ut
N O A C T IO N W IL L B E TA K E N b y the E C U - II.
3
D is p la y fa ult &
re q uire m a nua l re s e t
a fte r 4 fa ilure s .
M A X IM U M P R O T E C T IO N L E V E L :
F A U LT C O D E m e s s a ge s a re d is p la ye d a nd the a p p ro p ria te a c tio n is
ta k e n, a c c o rd ing to the p ro b le m e nc o unte re d .