HWH 625 SERIES Operator's Manual page 18

SENSING UNIT ADJUSTMENT
Level the vehicle by placing a bubble level in the center of
the freezer floor or upon whichever surface within the vehicle
that is to be level. Using the Leveling System and the bubble
level, ignoring the yellow LEVEL lights on the Touch Panel,
level the vehicle until the bubble is centered.
With the vehicle level according to the bubble level, if there
are no yellow lights lit on the Touch Panel, the sensing unit is
properly adjusted. If there are yellow LEVEL lights lit on the
Touch Panel, manual adjustments to the Sensing Unit are
needed. A Phillips screw driver or sockets w/driver or box
end wrenches of 7/8, 3/4, 1/2, 5/16 or 1/4 sizes will be needed.
The Sensing Unit is mounted inside the Control Box. The
Control Box is mounted to the power unit/valve assembly.
There are four LED's on the Sensing Unit, A,B,C and D. Refer
to the drawing below. The Sensing Unit is adjusted by turning
the adjustment nut to turn out LED's B and D. The adjustment
screw will turn out LED's A and C. If the adjustment nut has
to be turned more than 1/2 flat or the adjustment screw has to
be turned more than 3/4 turn to turn the LED out, there may
be a problem with the Sensing Unit or the mounting of the
Control Box. If two LED's are on, it is best to make the B-D
adjustments first, then hold the adjustment nut from moving
while making the A-C adjustment.
NOTE: If opposing LED's are lit, there is a problem with
the Sensing Unit.
If LED (A) is lit: Turn the adjustment screw COUNTER
CLOCKWISE until the LED is off.
If LED (C) is lit: Turn the adjustment screw CLOCKWISE
until the LED is off.
If LED (B) is lit: Turn the adjustment nut COUNTER
CLOCKWISE until the LED is off.
If LED (D) is lit: Turn the adjustment nut CLOCKWISE
until the LED is off.
IMPORTANT: When all 4 LED's are off, move the
vehicle to an unlevel position so one or two yellow
lights are on. Level the vehicle according to the yellow
LEVEL lights. Recheck the level. If more adjustment is
needed, DO NOT try to adjust the sensing unit until the
yellow level lights go out, instead just "tweak" the
sensing unit, ignoring the LED's on the sensing unit.
Example: After the initial adjustment and releveling
the vehicle, the front is still low. This means the front
yellow level light is turning off too soon. Determine
which sensing unit light is the front light, A-B-C or D.
Move the adjustment for that light very, very, slightly in
the OPPOSITE direction that is given in the above
instructions for LED's A, B, C, and D. This will allow
MP44.1501
SENSING UNIT MAINTENANCE/SERVICE
the front yellow light to stay on slightly longer to bring
the front up more. Again, unlevel the vehicle then
relevel the vehicle using the yellow level lights on the
touch panel. Recheck with a level. Repeat the
"tweaking" process until the system levels the vehicle
properly.
ADJUSTMENT NUT (5/16" OLD) - (1/2" NEW)
ADJUSTMENT SCREW (Phillips or 1/4")
(OLD STYLE)
ADJUSTMENT NUT (7/8" or 3/4")
LED'S - LOCATION
MAY BE DIFFERENT
B
A C
D
SENSING UNIT - TOP VIEW
ADJUSTMENT
NUT (5/16" OLD) - (1/2" NEW)
ADJUSTMENT
SCREW (Phillips or 1/4")
CONTROL BOX - SIDE VIEW
NOT IN PARK/BRAKE CHECK
CAUTION:
WHEN MAKING THIS CHECK, BLOCK
THE COACH WHEELS SECURELY SO THE COACH
CANNOT ROLL FORWARD OR BACKWARD.
Set the park/brake. Switch the ignition to the "ACC" or "ON"
position. Push the "ON/OFF" switch toward "ON". Release
the parking brake and confirm that the "PARK" indicator light
comes on. Reset the parking brake. The "PARK" indicator
light should go out. Switch the ignition to "OFF".
If any of the above checks or inspections reveal a problem
or if there are other problems or questions, consult a
qualified RV repair center, your vehicle or coach
manufacturer, or HWH CORPORATION for service or repair.
CONTROL
BOX WALL
(OLD STYLE)
ADJUSTMENT
NUT (7/8" or 3/4")
MP45.3259
07MAY09