Revision 3
V.
Winterizing Procedure
Caution:
Do
not
drain the hoses
and
assume the high pressure pump is drained. Water
always remains trapped inside the pump. Water freezing
in
the high pressure
pump
will damage the pump, such damage is not covered
by
the NLB
warranty.
Service People Required: 1
Recommended Tools: Adjustable wrenches
Supplies: Two (2) gallons
(7.6 l) of coolant, 50% concentration
of
non-toxic propylene
glycol low silicate antifreeze (rv antifreeze).
Plan for additional quantities when the diesel
engine radiator also requires coolant. Refer to
Section 3:
PRODUCT
OVERVIEW -
Specifications.
When the high pressure water jetting unit
is
to be left in temperatures below 32°F (0°C),
provisions must be made to keep the high pressure pump from freezing.
If
conditions will
allow water in the unit to freeze during shut-down periods, the entire system must be drained
to
prevent damage to the pump and piping. Antifreeze solution liquid must then be forced
from the suction line into the pumping chambers to force the fluid out
of
the pumping
chambers. The recommended procedure for this
is
listed in the following steps:
a.
Remove all high pressure hoses. Carefully drain all water from high pressure hoses,
and re-install.
b.
Drain all water from the water tank through the drain valve (Figure 5-5).
Figure 5-5. Drain valve location.
c.
After the tank
is
drained, open the top
of
the tank. Reach in and turn the pump suction
elbow in
an
upwards direction (Figure 5-6). Remove the filter screen.
© Copyright August, 2000 NLB Corporation
5-21
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