Nautilus MX3-500 Operating Manual page 35

Storage Prep and Freeze Protection Procedures:
Your Nautilus MX3-500 must be protected from freezing. Freezing can cause serious damage to the pump,
pump-out, auto-fill float valve, and any other component containing water. If the MX3-500 is transported or
stored in freezing temperatures, the following procedures should be performed.
ALSO, if the MX3-500 is stored for an extended period of time, the following procedure should be
performed to prevent the pump seals from drying out.
1. In a separate container mix 1/2 gallon of water with 1/2 gallon of automotive radiator Ethylene Glycol
anti-freeze. (Propylene glycol can be used as a non-toxic alternative anti-freeze.). Mix well and pour into
the solution tank.
2. Connect the solution hose to the solution outlet (female quick connect).
3. If not equipped with the optional Auto Fill System, snap an open quick connect onto the other end
of the hose and place the hose end back into the solution tank. Turn the pressure regulator knob counter-
clockwise to lower the pressure to 100psi or lower.
If equipped with the Auto Fill system, connect the opposite end of the HP solution hose to the Auto-
Fill inlet (male quick connect.) Leave the chemical feed hose in the solution tank and ensure the check
valve filter is submerged in the anti-freeze solution. To speed the process the metering tip can be
removed. Turn the pressure regulator knob counter-clockwise to lower the pressure to 100psi or lower
CAUTION: Applying high pressure (over 100psi) to the Auto-Fill system will cause damage to
the Float valve and chemical proportioning mechanism.
4. Turn the solution pump switch to the ON position and perform the pump priming procedure. Hold the
priming valve open for a few extra seconds to be sure the anti-freeze has passed through the priming
valve. When the pump is primed, allow the anti-freeze to circulate for 5-10 minutes. Mix and add more
anti-freeze solution as needed. For machines with the optional Auto Fill System, make sure end of
chemical feed hose stays submerged in the anti-freeze solution. This will assure that the anti-freeze will be
drawn into the proportioning valve.
5. Connect any cleaning tools and solution hoses that will be stored with the MX3-500. Direct tool spray
back into the solution tank or into a bucket. Repeat for all tools to be protected.
6. Turn the solution pump switch to the OFF position.
7. Use the vacuum hose to vacuum the remaining anti-freeze solution out of the solution tank and bucket.
8. If so equipped, remove the cap from the waste-pump out outlet fitting on the back of the machine.
Connect a hose to a drain or hold a bucket up to the fitting to catch the pump-out flow. Remove the lid
from the recovery tank. Turn the Waste Pump switch to the ON position to engage the pump-out. Turn
off the Waste Pump Switch as soon as you see anti-freeze flowing from the outlet fitting or hose.
9. Drain the remaining anti-freeze solution from the recovery tank and the machine is ready for storage.
RETURNING THE MX3-500 TO SERVICE AFTER STORAGE OR
FREEZE PROTECTION:
To return the MX3-500 to service, the anti-freeze must be flushed from the machine. Flush the anti-freeze
out of the machine by repeating the procedures above using fresh water in place of anti-freeze.
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