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HM750A1000
MAINTENANCE AND SERVICING
Required Maintenance
The HM750 humidifier has been designed to require
minimal maintenance. Regular maintenance consists of
checking the humidifier to ensure it is in good condition,
replacing the cylinder when the software advises that the
cylinder is spent and cleaning out the drain valve
whenever the cylinder is replaced.
CYLINDER
The cylinder LED will indicate when to replace the device
cylinder (see page 16). Approximate frequency of
replacement is once per year.
NOTE: It is normal to hear a rattle in a new cylinder
because it is shipped with a salt tablet to boost
conductivity.
FILL VALVE
The inlet to the fill valve is equiped with a strainer that
prevents debris in low quality supply water from entering
the system. Accumulation of debris on the strainer can
lead to reduced inlet water flow or complete blockage.
Thus, the fill valve strainer should be cleaned periodically,
depending on the water quality, or at the end of each
season.
DRAIN VALVE
Inspect annually.
Remove and clean scale/debris at the end of each season,
or as needed.
Running on highly conductive water can generate high
amount of scale leading to blockage of the valve plunger,
potentially causing a continuous leak. This could be
detected by the control system indicating a drain fault or
triggering GFCI if electric current leak is detected.
In all cases, proper cleaning of the drain valve is
recommended.
33-00289EF—05
HOSE CONNECTIONS
Inspect annually, clean as necessary.
NOZZLE (DUCT OR REMOTE)
Inspect annually, clean as necessary.
Extended Shutdown
Should it be required to disconnect power to the
humidifier for a period of extended shut-down, the
following procedure shall be followed:
1. Press the Power/Drain button.
2. Wait until the humidifier is completely drained
(usually takes less than 10 minutes). During the
drain cycle the fill valve will be activated to temper
the drain water.
3. Shut off the power to the humidifier with the external
disconnect.
4. Close the supply water shut-off valve.
NOTE: As long as the HM750 is powered, it will
automatically drain the cylinder when there has
not been a call for humidity for an extended
period of time (3 days). This feature will reduce or
prevent the possibility of corrosion and the
accumulation of algae and bacteria growing in
the cylinder. The cylinder will remain empty until
there is a call for humidity at which time the fill
valve will open and refill the cylinder. The unit will
go through its normal process for optimum
operation.
STARTING AFTER EXTENDED SHUTDOWN
1. Check to see the humidifier has not been damaged
and the installation has not been altered. See "Start
Up Procedure" on page 15.
2. Turn on the power to the humidifier with the external
disconnect and open the supply water shut-off valve.
3. Press the Power/Drain button.
4. Ensure there is no water flowing to drain.
5. Follow the start up procedure on page 15.
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